Alert archive / Oregon / Heat Advisories in 2021

Heat Advisory 1, NWS Medford, OR

May 29, 2021Siskiyou County, California; Curry County, Jackson County, Josephine County, Oregon

NWS Medford, OR issued this heat advisory at May 29, 2021, 1:22 PM PDT for Siskiyou County, California; Curry County, Jackson County, Josephine County, Oregon. It took effect at Jun 1, 2021, 11:00 AM PDT. It was in force for 34 hr.

The area

The counties it named.

The facts

Issued
May 29, 2021, 1:22 PM PDT (20:22 UTC)
In effect from
Jun 1, 2021, 11:00 AM PDT
Expired
Jun 2, 2021, 9:00 PM PDT
In force
34 hr
Issued by
NWS Medford, OR

Counties Siskiyou County, CA, Curry County, OR, Jackson County, OR, Josephine County, OR

The radar

The Medford radar (KMAX), 47 km from the middle of the area, began a volume at 20:27 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Medford/Jackson, OR (KMFR), launched 12:00Z, 8.4 hours before the alert went out and 42 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Medford/Jackson, OR at 12:00Z on 2021-05-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Medford/Jackson, OR at 12:00Z on 2021-05-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -10 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1480 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
-10 m²/s²
0-3 km storm-relative helicity
23 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

987 
WWUS76 KMFR 292022
NPWMFR

URGENT - WEATHER MESSAGE
National Weather Service Medford OR
122 PM PDT Sat May 29 2021

CAZ080>082-301200-
/O.UPG.KMFR.EH.A.0001.210601T1800Z-210603T0600Z/
/O.NEW.KMFR.HT.Y.0001.210601T1800Z-210602T0700Z/
Western Siskiyou County-Central Siskiyou County-
South Central Siskiyou County-
Including the cities of Callahan, Etna, Fort Jones, Greenview, 
Happy Camp, Scott Bar, Somes Bar, Hilt, Yreka, Dunsmuir, McCloud,
and Mount Shasta
122 PM PDT Sat May 29 2021

...HEAT ADVISORY IN EFFECT FROM 11 AM TUESDAY TO MIDNIGHT PDT
TUESDAY NIGHT...

* WHAT...High temperatures between 100 and 109 degrees expected.

* WHERE...Valleys of Western and Central Siskiyou County,
  including the Klamath River, Scott and Shasta Valleys. This
  includes the cities of Happy Camp, Klamath River, Etna, Yreka,
  Montague, Mt Shasta City, Dunsmuir, and McCloud. 

* WHEN...From 11 AM Tuesday to midnight PDT Tuesday night.

* IMPACTS...Hot temperatures will increase the chances for heat
  related illnesses to occur, especially for those working
  outdoors.

* ADDITIONAL DETAILS...In addition to hot day time temperatures,
  overnight temperatures will be unseasonably warm as well. This
  will provide little relief from the daytime heat, adding to heat
  related stress. 

* View the hazard area in detail at 
  https://www.wrh.noaa.gov/map/?wfo=mfr

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

Take extra precautions if you work or spend time outside. When
possible reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

&&

$$

ORZ024-026-301200-
/O.UPG.KMFR.EH.A.0001.210601T1800Z-210603T0600Z/
/O.NEW.KMFR.HT.Y.0001.210601T1800Z-210602T0700Z/
Eastern Curry County and Josephine County-Jackson County-
Including the cities of Grants Pass, Cave Junction, Medford, 
and Ashland
122 PM PDT Sat May 29 2021

...HEAT ADVISORY IN EFFECT FROM 11 AM TUESDAY TO MIDNIGHT PDT
TUESDAY NIGHT...

* WHAT...High temperatures between 100 and 105 degrees expected.

* WHERE...Populated areas of Jackson and Josephine Counties,
  including the Rogue, Applegate, and Illinois Valleys. This
  includes the cities of Ashland, Medford, Shady Cove, Grants
  Pass, Selma, Cave Junction, Obrien, Applegate, Ruch and
  Jacksonville. 

* WHEN...From 11 AM Tuesday to midnight PDT Tuesday night.

* IMPACTS...Hot temperatures will increase the chances for heat
  related illnesses to occur, especially for those working
  outdoors.

* ADDITIONAL DETAILS...In addition to hot day time temperatures,
  overnight temperatures will be unseasonably warm as well. This
  will provide little relief from the daytime heat, adding to heat
  related stress. 

* View the hazard area in detail at 
  https://www.wrh.noaa.gov/map/?wfo=mfr

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

Take extra precautions if you work or spend time outside. When
possible reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

&&

$$

Visit us at https://www.weather.gov/Medford
9 follow-up statements
530 
WWUS76 KMFR 300928
NPWMFR

URGENT - WEATHER MESSAGE
National Weather Service Medford OR
228 AM PDT Sun May 30 2021

CAZ080>082-302200-
/O.CON.KMFR.HT.Y.0001.210601T1800Z-210602T0700Z/
Western Siskiyou County-Central Siskiyou County-
South Central Siskiyou County-
Including the cities of Callahan, Etna, Fort Jones, Greenview, 
Happy Camp, Scott Bar, Somes Bar, Hilt, Yreka, Dunsmuir, McCloud,
and Mount Shasta
228 AM PDT Sun May 30 2021

...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM TUESDAY TO MIDNIGHT
PDT TUESDAY NIGHT...

* WHAT...High temperatures between 100 and 109 degrees expected.

* WHERE...Valleys of Western and Central Siskiyou County, 
  including the Klamath River, Scott and Shasta Valleys. This 
  includes the cities of Happy Camp, Klamath River, Etna, Yreka, 
  Montague, Mt Shasta City, Dunsmuir, and McCloud.

* WHEN...From 11 AM Tuesday to midnight PDT Tuesday night.

* IMPACTS...Hot temperatures will increase the chances for heat 
  related illnesses to occur, especially for those working 
  outdoors.

* ADDITIONAL DETAILS...In addition to hot day time temperatures, 
  overnight temperatures will be unseasonably warm as well. This 
  will provide little relief from the daytime heat, adding to 
  heat related stress.

* View the hazard area in detail at 
  https://www.wrh.noaa.gov/map/?wfo=mfr

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

Take extra precautions if you work or spend time outside. When
possible reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

Water from area rivers and the ocean are very cold despite the hot
temperatures. The cold water can cause even experienced swimmers
to have trouble staying afloat. If you are swimming or boating, 
be sure to wear a life jacket.

&&

$$

ORZ024-026-302200-
/O.CON.KMFR.HT.Y.0001.210601T1800Z-210602T0700Z/
Eastern Curry County and Josephine County-Jackson County-
Including the cities of Grants Pass, Cave Junction, Medford, 
and Ashland
228 AM PDT Sun May 30 2021

...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM TUESDAY TO MIDNIGHT
PDT TUESDAY NIGHT...

* WHAT...High temperatures between 100 and 104 degrees expected.

* WHERE...Populated areas of Jackson and Josephine Counties,
  including the Rogue, Applegate, and Illinois Valleys. This
  includes the cities of Ashland, Medford, Eagle Point, Shady
  Cove, Grants Pass, Galice, Selma, Cave Junction, Obrien, 
  Applegate, Ruch and Jacksonville.

* WHEN...From 11 AM Tuesday to midnight PDT Tuesday night.

* IMPACTS...Hot temperatures will increase the chances for heat 
  related illnesses to occur, especially for those working 
  outdoors.

* ADDITIONAL DETAILS...In addition to hot day time temperatures, 
  overnight temperatures will be unseasonably warm as well. This 
  will provide little relief from the daytime heat, adding to 
  heat related stress.

* View the hazard area in detail at 
  https://www.wrh.noaa.gov/map/?wfo=mfr

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

Take extra precautions if you work or spend time outside. When
possible reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

Water from area rivers and the ocean are very cold despite the hot
temperatures. The cold water can cause even experienced swimmers
to have trouble staying afloat. If you are swimming or boating, 
be sure to wear a life jacket.

&&

$$

Visit us at https://www.weather.gov/Medford
003 
WWUS76 KMFR 302031
NPWMFR

URGENT - WEATHER MESSAGE
National Weather Service Medford OR
131 PM PDT Sun May 30 2021

CAZ080>082-311200-
/O.CON.KMFR.HT.Y.0001.210601T1800Z-210602T0700Z/
Western Siskiyou County-Central Siskiyou County-
South Central Siskiyou County-
Including the cities of Callahan, Etna, Fort Jones, Greenview, 
Happy Camp, Scott Bar, Somes Bar, Hilt, Yreka, Dunsmuir, McCloud,
and Mount Shasta
131 PM PDT Sun May 30 2021

...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM TUESDAY TO MIDNIGHT
PDT TUESDAY NIGHT...

* WHAT...High temperatures between 100 and 109 degrees expected.

* WHERE...Valleys of Western and Central Siskiyou County, 
  including the Klamath River, Scott and Shasta Valleys. This 
  includes the cities of Happy Camp, Klamath River, Etna, Yreka, 
  Montague, Mt Shasta City, Dunsmuir, and McCloud.

* WHEN...From 11 AM Tuesday to midnight PDT Tuesday night.

* IMPACTS...Hot temperatures will increase the chances for heat 
  related illnesses to occur, especially for those working 
  outdoors.

* ADDITIONAL DETAILS...In addition to hot day time temperatures, 
  overnight temperatures will be unseasonably warm as well. This 
  will provide little relief from the daytime heat, adding to 
  heat related stress.

* View the hazard area in detail at 
  https://www.wrh.noaa.gov/map/?wfo=mfr

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

Take extra precautions if you work or spend time outside. When
possible reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

Water from area rivers and the ocean are very cold despite the
hot temperatures. The cold water can cause even experienced
swimmers to have trouble staying afloat. If you are swimming or
boating, be sure to wear a life jacket.

&&

$$

ORZ024-026-311200-
/O.CON.KMFR.HT.Y.0001.210601T1800Z-210602T0700Z/
Eastern Curry County and Josephine County-Jackson County-
Including the cities of Grants Pass, Cave Junction, Medford, 
and Ashland
131 PM PDT Sun May 30 2021

...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM TUESDAY TO MIDNIGHT
PDT TUESDAY NIGHT...

* WHAT...High temperatures between 100 and 105 degrees expected.

* WHERE...Populated areas of Jackson and Josephine Counties, 
  including the Rogue, Applegate, and Illinois Valleys. This 
  includes the cities of Ashland, Medford, Eagle Point, Shady 
  Cove, Grants Pass, Galice, Selma, Cave Junction, Obrien, 
  Applegate, Ruch and Jacksonville.

* WHEN...From 11 AM Tuesday to midnight PDT Tuesday night.

* IMPACTS...Hot temperatures will increase the chances for heat 
  related illnesses to occur, especially for those working 
  outdoors.

* ADDITIONAL DETAILS...In addition to hot day time temperatures, 
  overnight temperatures will be unseasonably warm as well. This 
  will provide little relief from the daytime heat, adding to 
  heat related stress.

* View the hazard area in detail at 
  https://www.wrh.noaa.gov/map/?wfo=mfr

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

Take extra precautions if you work or spend time outside. When
possible reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

Water from area rivers and the ocean are very cold despite the
hot temperatures. The cold water can cause even experienced
swimmers to have trouble staying afloat. If you are swimming or
boating, be sure to wear a life jacket.

&&

$$

Visit us at https://www.weather.gov/Medford
747 
WWUS76 KMFR 311029
NPWMFR

URGENT - WEATHER MESSAGE
National Weather Service Medford OR
329 AM PDT Mon May 31 2021

CAZ080>082-312300-
/O.CON.KMFR.HT.Y.0001.210601T1800Z-210602T0700Z/
Western Siskiyou County-Central Siskiyou County-
South Central Siskiyou County-
Including the cities of Callahan, Etna, Fort Jones, Greenview, 
Happy Camp, Scott Bar, Somes Bar, Hilt, Yreka, Dunsmuir, McCloud,
and Mount Shasta
329 AM PDT Mon May 31 2021

...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM TUESDAY TO MIDNIGHT
PDT TUESDAY NIGHT...

* WHAT...High temperatures between 100 and 109 degrees expected.

* WHERE...Valleys of Western and Central Siskiyou County,
  including the Klamath River, Scott and Shasta Valleys. This 
  includes the cities of Happy Camp, Klamath River, Etna, Yreka, 
  Montague, Mt Shasta City, Dunsmuir, and McCloud.

* WHEN...From 11 AM Tuesday to midnight PDT Tuesday night.

* IMPACTS...Hot temperatures will increase the chances for heat 
  related illnesses to occur, especially for those working 
  outdoors.

* ADDITIONAL DETAILS...In addition to hot day time temperatures, 
  overnight temperatures will be unseasonably warm as well. This 
  will provide little relief from the daytime heat, adding to 
  heat related stress.

* View the hazard area in detail at 
  https://www.wrh.noaa.gov/map/?wfo=mfr

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

Take extra precautions if you work or spend time outside. When
possible reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

Water from area rivers and the ocean are very cold despite the
hot temperatures. The cold water can cause even experienced
swimmers to have trouble staying afloat. If you are swimming or
boating, be sure to wear a life jacket.

&&

$$

ORZ024-026-312300-
/O.CON.KMFR.HT.Y.0001.210601T1800Z-210602T0700Z/
Eastern Curry County and Josephine County-Jackson County-
Including the cities of Grants Pass, Cave Junction, Medford, 
and Ashland
329 AM PDT Mon May 31 2021

...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM TUESDAY TO MIDNIGHT
PDT TUESDAY NIGHT...

* WHAT...High temperatures between 100 and 105 degrees expected.

* WHERE...Populated areas of Jackson and Josephine Counties, 
  including the Rogue, Applegate, and Illinois Valleys. This 
  includes the cities of Ashland, Medford, Eagle Point, Shady 
  Cove, Grants Pass, Galice, Selma, Cave Junction, Obrien, 
  Applegate, Ruch and Jacksonville.

* WHEN...From 11 AM Tuesday to midnight PDT Tuesday night.

* IMPACTS...Hot temperatures will increase the chances for heat 
  related illnesses to occur, especially for those working 
  outdoors.

* ADDITIONAL DETAILS...In addition to hot day time temperatures, 
  overnight temperatures will be unseasonably warm as well. This 
  will provide little relief from the daytime heat, adding to 
  heat related stress.

* View the hazard area in detail at 
  https://www.wrh.noaa.gov/map/?wfo=mfr

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

Take extra precautions if you work or spend time outside. When
possible reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

Water from area rivers and the ocean are very cold despite the
hot temperatures. The cold water can cause even experienced
swimmers to have trouble staying afloat. If you are swimming or
boating, be sure to wear a life jacket.

&&

$$

Visit us at https://www.weather.gov/Medford
254 
WWUS76 KMFR 312123
NPWMFR

URGENT - WEATHER MESSAGE
National Weather Service Medford OR
223 PM PDT Mon May 31 2021

CAZ080>082-011200-
/O.CON.KMFR.HT.Y.0001.210601T1800Z-210602T0700Z/
Western Siskiyou County-Central Siskiyou County-
South Central Siskiyou County-
Including the cities of Callahan, Etna, Fort Jones, Greenview, 
Happy Camp, Scott Bar, Somes Bar, Hilt, Yreka, Dunsmuir, McCloud,
and Mount Shasta
223 PM PDT Mon May 31 2021

...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM TUESDAY TO MIDNIGHT
PDT TUESDAY NIGHT...

* WHAT...High temperatures between 100 and 107 degrees expected.

* WHERE...Valleys of Western and Central Siskiyou County, 
  including the Klamath River, Scott and Shasta Valleys. This 
  includes the cities of Happy Camp, Klamath River, Etna, Yreka, 
  Montague, Mt Shasta City, Dunsmuir, and McCloud.

* WHEN...From 11 AM Tuesday to midnight PDT Tuesday night.

* IMPACTS...Hot temperatures will increase the chances for heat 
  related illnesses to occur, especially for those working 
  outdoors.

* ADDITIONAL DETAILS...In addition to hot day time temperatures, 
  overnight temperatures will be unseasonably warm as well. This 
  will provide little relief from the daytime heat, adding to 
  heat related stress.

* View the hazard area in detail at 
  https://www.wrh.noaa.gov/map/?wfo=mfr

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

Take extra precautions if you work or spend time outside. When
possible reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

Water from area rivers and the ocean are very cold despite the
hot temperatures. The cold water can cause even experienced
swimmers to have trouble staying afloat. If you are swimming or
boating, be sure to wear a life jacket.

&&

$$

ORZ024-026-011200-
/O.CON.KMFR.HT.Y.0001.210601T1800Z-210602T0700Z/
Eastern Curry County and Josephine County-Jackson County-
Including the cities of Grants Pass, Cave Junction, Medford, 
and Ashland
223 PM PDT Mon May 31 2021

...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM TUESDAY TO MIDNIGHT
PDT TUESDAY NIGHT...

* WHAT...High temperatures between 100 and 105 expected.

* WHERE...Populated areas of Jackson and Josephine Counties, 
  including the Rogue, Applegate, and Illinois Valleys. This 
  includes the cities of Ashland, Medford, Eagle Point, Shady 
  Cove, Grants Pass, Galice, Selma, Cave Junction, Obrien, 
  Applegate, Ruch and Jacksonville.

* WHEN...From 11 AM Tuesday to midnight PDT Tuesday night.

* IMPACTS...Hot temperatures will increase the chances for heat 
  related illnesses to occur, especially for those working 
  outdoors.

* ADDITIONAL DETAILS...In addition to hot day time temperatures, 
  overnight temperatures will be unseasonably warm as well. This 
  will provide little relief from the daytime heat, adding to 
  heat related stress.

* View the hazard area in detail at 
  https://www.wrh.noaa.gov/map/?wfo=mfr

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

Take extra precautions if you work or spend time outside. When
possible reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

Water from area rivers and the ocean are very cold despite the
hot temperatures. The cold water can cause even experienced
swimmers to have trouble staying afloat. If you are swimming or
boating, be sure to wear a life jacket.

&&

$$

Visit us at https://www.weather.gov/Medford
415 
WWUS76 KMFR 010356
NPWMFR

URGENT - WEATHER MESSAGE
National Weather Service Medford OR
856 PM PDT Mon May 31 2021

CAZ080>082-012200-
/O.EXT.KMFR.HT.Y.0001.210601T1800Z-210603T0400Z/
Western Siskiyou County-Central Siskiyou County-
South Central Siskiyou County-
Including the cities of Callahan, Etna, Fort Jones, Greenview, 
Happy Camp, Scott Bar, Somes Bar, Weed, Yreka, Dunsmuir, 
and Mount Shasta
856 PM PDT Mon May 31 2021

...HEAT ADVISORY NOW IN EFFECT FROM 11 AM TUESDAY TO 9 PM PDT
WEDNESDAY...

* WHAT...Daytime maximum temperatures between 95 and 108 degrees
  and overnight minimum temperatures between in the middle 60s to
  lower 70s expected.

* WHERE...Valleys of Western and Central Siskiyou County,
  including the Klamath River, Scott, and Shasta valleys. This
  includes the towns and communities of Happy Camp, Seiad Valley,
  Klamath River, Etna, Greenview, Fort Jones, Yreka, Montague, Mt
  Shasta City, Dunsmuir, and McCloud.

* WHEN...From 11 AM Tuesday to 9 PM PDT Wednesday.

* IMPACTS...Hot temperatures will increase the chances for heat
  related illnesses to occur, especially for those working
  outdoors. Warm overnight temperatures will also result in a
  shorter period for people to cool down and rehydrate from the
  daytime heat.

* ADDITIONAL DETAILS...In addition to hot day time temperatures, 
  overnight temperatures will be unseasonably warm as well. This 
  will provide little relief from the daytime heat, adding to 
  heat related stress.

* View the hazard area in detail at 
  https://www.wrh.noaa.gov/map/?wfo=mfr

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

Take extra precautions if you work or spend time outside. When
possible reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

Water from area rivers and the ocean are very cold despite the
hot temperatures. The cold water can cause even experienced
swimmers to have trouble staying afloat. If you are swimming or
boating, be sure to wear a life jacket.

&&

$$

ORZ024-026-012200-
/O.CON.KMFR.HT.Y.0001.210601T1800Z-210602T0700Z/
Eastern Curry County and Josephine County-Jackson County-
Including the cities of Grants Pass, Cave Junction, Medford, 
and Ashland
856 PM PDT Mon May 31 2021

...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM TUESDAY TO MIDNIGHT
PDT TUESDAY NIGHT...

* WHAT...High temperatures between 100 and 105 expected.

* WHERE...Populated areas of Jackson and Josephine Counties, 
  including the Rogue, Applegate, and Illinois Valleys. This 
  includes the cities of Ashland, Medford, Eagle Point, Shady 
  Cove, Grants Pass, Galice, Selma, Cave Junction, Obrien, 
  Applegate, Ruch and Jacksonville.

* WHEN...From 11 AM Tuesday to midnight PDT Tuesday night.

* IMPACTS...Hot temperatures will increase the chances for heat 
  related illnesses to occur, especially for those working 
  outdoors.

* ADDITIONAL DETAILS...In addition to hot day time temperatures, 
  overnight temperatures will be unseasonably warm as well. This 
  will provide little relief from the daytime heat, adding to 
  heat related stress.

* View the hazard area in detail at 
  https://www.wrh.noaa.gov/map/?wfo=mfr

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

Take extra precautions if you work or spend time outside. When
possible reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

Water from area rivers and the ocean are very cold despite the
hot temperatures. The cold water can cause even experienced
swimmers to have trouble staying afloat. If you are swimming or
boating, be sure to wear a life jacket.

&&

$$
BTL
Visit us at https://www.weather.gov/Medford
079 
WWUS76 KMFR 012100
NPWMFR

URGENT - WEATHER MESSAGE
National Weather Service Medford OR
200 PM PDT Tue Jun 1 2021

ORZ024-026-020700-
/O.CON.KMFR.HT.Y.0001.000000T0000Z-210602T0700Z/
Eastern Curry County and Josephine County-Jackson County-
Including the cities of Grants Pass, Cave Junction, Medford, 
and Ashland
200 PM PDT Tue Jun 1 2021

...HEAT ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT PDT TONIGHT...

* WHAT...High temperatures between 100 and 105 expected.

* WHERE...Populated areas of Jackson and Josephine Counties, 
  including the Rogue, Applegate, and Illinois Valleys. This 
  includes the cities of Ashland, Medford, Eagle Point, Shady 
  Cove, Grants Pass, Galice, Selma, Cave Junction, Obrien, 
  Applegate, Ruch and Jacksonville.

* WHEN...From 11 AM Tuesday to midnight PDT Tuesday night.

* IMPACTS...Hot temperatures will increase the chances for heat 
  related illnesses to occur, especially for those working 
  outdoors.

* ADDITIONAL DETAILS...In addition to hot day time temperatures, 
  overnight temperatures will be unseasonably warm as well. This 
  will provide little relief from the daytime heat, adding to 
  heat related stress.

* View the hazard area in detail at 
  https://www.wrh.noaa.gov/map/?wfo=mfr

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

Take extra precautions if you work or spend time outside. When
possible reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

Water from area rivers and the ocean are very cold despite the
hot temperatures. The cold water can cause even experienced
swimmers to have trouble staying afloat. If you are swimming or
boating, be sure to wear a life jacket.

&&

$$

CAZ080>082-020845-
/O.CON.KMFR.HT.Y.0001.000000T0000Z-210603T0400Z/
Western Siskiyou County-Central Siskiyou County-
South Central Siskiyou County-
Including the cities of Callahan, Etna, Fort Jones, Greenview, 
Happy Camp, Scott Bar, Somes Bar, Weed, Yreka, Dunsmuir, 
and Mount Shasta
200 PM PDT Tue Jun 1 2021

...HEAT ADVISORY REMAINS IN EFFECT UNTIL 9 PM PDT WEDNESDAY...

* WHAT...Daytime maximum temperatures between 95 and 108 degrees 
  and overnight minimum temperatures between in the middle 60s 
  to lower 70s expected.

* WHERE...Valleys of Western and Central Siskiyou County, 
  including the Klamath River, Scott, and Shasta valleys. This 
  includes the towns and communities of Happy Camp, Seiad 
  Valley, Klamath River, Etna, Greenview, Fort Jones, Yreka, 
  Montague, Mt Shasta City, Dunsmuir, and McCloud.

* WHEN...From 11 AM Tuesday to 9 PM PDT Wednesday.

* IMPACTS...Hot temperatures will increase the chances for heat 
  related illnesses to occur, especially for those working 
  outdoors. Warm overnight temperatures will also result in a 
  shorter period for people to cool down and rehydrate from the 
  daytime heat.

* ADDITIONAL DETAILS...In addition to hot day time temperatures, 
  overnight temperatures will be unseasonably warm as well. This 
  will provide little relief from the daytime heat, adding to 
  heat related stress.

* View the hazard area in detail at 
  https://www.wrh.noaa.gov/map/?wfo=mfr

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

Take extra precautions if you work or spend time outside. When
possible reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

Water from area rivers and the ocean are very cold despite the
hot temperatures. The cold water can cause even experienced
swimmers to have trouble staying afloat. If you are swimming or
boating, be sure to wear a life jacket.

&&

$$

Visit us at https://www.weather.gov/Medford
803 
WWUS76 KMFR 020528
NPWMFR

URGENT - WEATHER MESSAGE
National Weather Service Medford OR
1028 PM PDT Tue Jun 1 2021

ORZ024-026-022345-
/O.EXT.KMFR.HT.Y.0001.000000T0000Z-210603T0400Z/
Eastern Curry County and Josephine County-Jackson County-
Including the cities of Grants Pass and Medford
1028 PM PDT Tue Jun 1 2021

...HEAT ADVISORY NOW IN EFFECT UNTIL 9 PM PDT WEDNESDAY...

* WHAT...High temperatures Ranging from 97 to 100 degrees.

* WHERE...Most of the Rogue Valley including Medford, Grants Pass,
  Talent, Phoenix, Central Point, Eagle Point, White City, Shady
  Cove, and Gold Hill.

* WHEN...Until 9 PM PDT Wednesday.

* IMPACTS...Hot temperatures will increase the chances for heat 
  related illnesses to occur, especially for those working 
  outdoors.

* ADDITIONAL DETAILS...In addition to hot day time temperatures, 
  overnight temperatures will be unseasonably warm as well. This 
  will provide little relief from the daytime heat, adding to 
  heat related stress.

* View the hazard area in detail at 
  https://www.wrh.noaa.gov/map/?wfo=mfr

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

Take extra precautions if you work or spend time outside. When
possible reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

Water from area rivers and the ocean are very cold despite the
hot temperatures. The cold water can cause even experienced
swimmers to have trouble staying afloat. If you are swimming or
boating, be sure to wear a life jacket.

&&

$$

CAZ080>082-022345-
/O.CON.KMFR.HT.Y.0001.000000T0000Z-210603T0400Z/
Western Siskiyou County-Central Siskiyou County-
South Central Siskiyou County-
Including the cities of Callahan, Etna, Fort Jones, Greenview, 
Happy Camp, Scott Bar, Somes Bar, Weed, Yreka, Dunsmuir, 
and Mount Shasta
1028 PM PDT Tue Jun 1 2021

...HEAT ADVISORY REMAINS IN EFFECT UNTIL 9 PM PDT WEDNESDAY...

* WHAT...High temperatures 98 to 104 expected.

* WHERE...Valleys of Western and Central Siskiyou County, 
  including the Klamath River, Scott, and Shasta valleys. This 
  includes the towns and communities of Happy Camp, Seiad 
  Valley, Klamath River, Etna, Greenview, Fort Jones, Yreka, 
  Montague, Mt Shasta City, Dunsmuir, and McCloud.

* WHEN...Until 9 PM PDT Wednesday.

* IMPACTS...Hot temperatures will increase the chances for heat 
  related illnesses to occur, especially for those working 
  outdoors. Warm overnight temperatures will also result in a 
  shorter period for people to cool down and rehydrate from the 
  daytime heat.

* ADDITIONAL DETAILS...In addition to hot day time temperatures, 
  overnight temperatures will be unseasonably warm as well. This 
  will provide little relief from the daytime heat, adding to 
  heat related stress.

* View the hazard area in detail at 
  https://www.wrh.noaa.gov/map/?wfo=mfr

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

Take extra precautions if you work or spend time outside. When
possible reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

Water from area rivers and the ocean are very cold despite the
hot temperatures. The cold water can cause even experienced
swimmers to have trouble staying afloat. If you are swimming or
boating, be sure to wear a life jacket.

&&

$$

Visit us at https://www.weather.gov/Medford
567 
WWUS76 KMFR 022100
NPWMFR

URGENT - WEATHER MESSAGE
National Weather Service Medford OR
200 PM PDT Wed Jun 2 2021

ORZ024-026-030400-
/O.CON.KMFR.HT.Y.0001.000000T0000Z-210603T0400Z/
Eastern Curry County and Josephine County-Jackson County-
Including the cities of Grants Pass and Medford
200 PM PDT Wed Jun 2 2021

...HEAT ADVISORY REMAINS IN EFFECT UNTIL 9 PM PDT THIS EVENING...

* WHAT...High temperatures Ranging from 97 to 100 degrees.

* WHERE...Most of the Rogue Valley including Medford, Grants 
  Pass, Talent, Phoenix, Central Point, Eagle Point, White City, 
  Shady Cove, and Gold Hill.

* WHEN...Until 9 PM PDT Wednesday.

* IMPACTS...Hot temperatures will increase the chances for heat 
  related illnesses to occur, especially for those working 
  outdoors.

* View the hazard area in detail at 
  https://www.wrh.noaa.gov/map/?wfo=mfr

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

Take extra precautions if you work or spend time outside. When
possible reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

Water from area rivers and the ocean are very cold despite the
hot temperatures. The cold water can cause even experienced
swimmers to have trouble staying afloat. If you are swimming or
boating, be sure to wear a life jacket.

&&

$$

CAZ080>082-030400-
/O.CON.KMFR.HT.Y.0001.000000T0000Z-210603T0400Z/
Western Siskiyou County-Central Siskiyou County-
South Central Siskiyou County-
Including the cities of Callahan, Etna, Fort Jones, Greenview, 
Happy Camp, Scott Bar, Somes Bar, Weed, Yreka, Dunsmuir, 
and Mount Shasta
200 PM PDT Wed Jun 2 2021

...HEAT ADVISORY REMAINS IN EFFECT UNTIL 9 PM PDT THIS EVENING...

* WHAT...High temperatures 98 to 104 expected.

* WHERE...Valleys of Western and Central Siskiyou County, 
  including the Klamath River, Scott, and Shasta valleys. This 
  includes the towns and communities of Happy Camp, Seiad 
  Valley, Klamath River, Etna, Greenview, Fort Jones, Yreka, 
  Montague, Mt Shasta City, Dunsmuir, and McCloud.

* WHEN...Until 9 PM PDT Wednesday.

* IMPACTS...Hot temperatures will increase the chances for heat
  related illnesses to occur, especially for those working
  outdoors.

* View the hazard area in detail at 
  https://www.wrh.noaa.gov/map/?wfo=mfr

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

Take extra precautions if you work or spend time outside. When
possible reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

Water from area rivers and the ocean are very cold despite the
hot temperatures. The cold water can cause even experienced
swimmers to have trouble staying afloat. If you are swimming or
boating, be sure to wear a life jacket.

&&

$$

Visit us at https://www.weather.gov/Medford
579 
WWUS76 KMFR 030344
NPWMFR

URGENT - WEATHER MESSAGE
National Weather Service Medford OR
844 PM PDT Wed Jun 2 2021

ORZ024-026-030445-
/O.EXP.KMFR.HT.Y.0001.000000T0000Z-210603T0400Z/
Eastern Curry County and Josephine County-Jackson County-
Including the cities of Grants Pass and Medford
844 PM PDT Wed Jun 2 2021

...HEAT ADVISORY WILL EXPIRE AT 9 PM PDT THIS EVENING...

Although conditions will remain warm overnight, the heat has
largely peaked for our area. Conditions will still be warmer than
normal tomorrow, but a gradual cooling trend will occur through 
the weekend.

$$

CAZ080>082-030445-
/O.EXP.KMFR.HT.Y.0001.000000T0000Z-210603T0400Z/
Western Siskiyou County-Central Siskiyou County-
South Central Siskiyou County-
Including the cities of Callahan, Etna, Fort Jones, Greenview, 
Happy Camp, Scott Bar, Somes Bar, Weed, Yreka, Dunsmuir, 
and Mount Shasta
844 PM PDT Wed Jun 2 2021

...HEAT ADVISORY WILL EXPIRE AT 9 PM PDT THIS EVENING...

Although conditions will remain warm overnight, the heat has
largely peaked for our area. Conditions will still be warmer than
normal tomorrow, but a gradual cooling trend will occur through 
the weekend.

$$

Visit us at https://www.weather.gov/Medford

What forecasters said that day

The local office's own words before this heat advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Medford, OR wrote its last area forecast discussion before this heat advisory went out at May 29, 10:53 AM PDT, 2 hours 29 minutes earlier.

Area forecast discussion, May 29, 10:53 AM PDT, 2 hours 29 minutes before
Area Forecast Discussion
National Weather Service Medford OR
1053 AM PDT Sat May 29 2021

.UPDATE...Updated Aviation Section for the 18z TAFs.

&&

.PREV DISCUSSION... /Issued 805 AM PDT Sat May 29 2021/

DISCUSSION...Only minor updates made this morning, mostly to
bring cloud cover in line with current observations. Patchy fog
developed in the Coquille Basin while a layer of marine stratus
has reached into the Brookings area this morning. Also, some high
level cirrus streams across the east side this morning. Patches of
cirrus will continue to stream through the area today while the
lower clouds along the coast will dissipate over the next few
hours. Mostly sunny skies are expected this afternoon with high
temperatures about 5 degrees warmer than yesterday's readings.
This warming trend will continue through the weekend and into next
week as we expect an early season heat wave to bring the warmest
temperatures of the year so far. For more details on the heat, as
well as the anticipated cool down, see the previous discussion
below. /BR-y

AVIATION...For the 29/18Z TAF Cycle...VFR conditions will prevail
through this evening. North winds near shore will be gusty this
afternoon and evening. Gusty winds are also likely at the surface of
west side valleys.

Expecting LIFR conditions along the coast again late tonight,
including at KOTH. -Miles

MARINE...Updated 800 AM PDT Saturday 29 May 2021...The general
pattern will favor a thermal trough across northern California and
far southern Oregon. This pattern will keep gusty winds across the
waters of northern California and far southern Oregon with lighter
winds to the north into early next week.

While wind waves remain both dominant and highest over the southern
part of the waters, a northwest swell will continue to decay. This
will result in lowering seas north of Cape Arago through Sunday.
Seas will remain steep south of Cape Arago through this evening,
except very steep south of Cape Sebastian.

Later tonight through Monday evening, seas will remain steep south
of Cape Blanco, though south of Cape Sebastian there is the
potential for another brief episode of high and very steep seas with
winds approaching gale force Monday afternoon and evening.

There will be a trend of diminishing winds and seas as the thermal
trough pushes farther inland on Tuesday then low pressure disrupts
the pattern on Wednesday.
Sandler/CC

PREV DISCUSSION... /Issued 354 AM PDT Sat May 29 2021/

DISCUSSION... (including Fire Weather)...The -0.2 degree tilt
shows returns over a broad area concurrent with an inversion.
Meanwhile, the 0.5 degree tilt shows no returns. The upper air
sounding this morning will be interesting to note if it will show
a similar strong subsidence inversion with very dry air above the
inversion layer like it did last night. Above the inversion layer
satellite imagery depicts some higher cirrus clouds which will
keep us from reaching the full potential of cooling overnight.

Overall, patterns like the subsidence inversion indicate that the
area is under an area of building high pressure. In addition, when
looking at contours of thickness, it is apparent that the thermal
trough is building offshore and will continue to do so over the
next several days. As a result, Southern Oregon and northern
California will see a warming and drying trend across the next 5
days.

The hottest day for the south coast will be Monday when the
thermal trough begins to move ashore. This along with the winds
from the northeast will bring temperatures into the low 80s in
Brookings. Since winds will be from the north or northeast areas
areas away from the Chetco drainage will be a bit cooler with
temperatures only the upper 60s to low 70s. Then, as the thermal
trough moves over the West Side Valleys on Tuesday, expect that to
be the hottest day so far this year with many areas south of the
Umpqua Divide reaching the upper 90s to triple digits. This will
challenge several records at our climate sites.

Then on Wednesday, expect the hottest temperatures for the east
side as the thermal trough moves eastward past the
Cascades.Temperatures will reach into the upper 80s on Tuesday and
into the 90s on Wednesday. Still, for West Side Valleys, expect
the upper 90s to low triple digits possible once again. It will
depend on how quickly the thermal trough moves through the area.

Although the forecast has trended temperatures down a degree or
two in most places, which makes sense that both the GFS and ECMWF
ensembles don't show us reaching triple digits; and traditional
methods of forecasting 850 temperatures would agree with this
assessment. It is worth noting, however, how dry the layer is
above the subsidence inversion, and that this will continue to
keep things extremely dry across our area. Thus, it appears as if
this may be a case where ensembles are underdispersive. That and
the National Blend of Models gives Medford a 68 percent chance of
reaching 100 degrees. Have gone ahead an issued an excessive heat
watch for portions of the West Side and northern California
valleys for Tuesday and Wednesday. This is significant heat we're
expecting in early June.

For those concerned about fire weather during the next several
days, expect humidities to reach into the low teens to areas of
single digits across much of the area (except for the coast).
Luckily winds are not expected to be extremely breezy. However,
have trended the humidity recoveries lower toward statistical
guidance due to the expected northeast wind helping dry things
out.

Beginning Thursday, the ridge breaks down and a weak trough moves
through the area, largely to our north. Models seem to be a little
optimistic when it comes to precipitation in our area, but the
coast and portions of the Umpqua Basin may have the best shot at
showers. Additionally, have left the thunderstorm chances from the
day shift chances decreasing somewhat. Have very little confidence
in the pattern to be making whole-scale changes as the guidance is
all over the place. Fortunately for most, the breakdown of the
ridge will mean somewhat cooler temperatures. -Schaaf

AVIATION...For the 29/12Z TAF Cycle...Other than patchy morning low
clouds and fog around Brookings, the Coquille Valley, and Reedsport,
VFR conditions will prevail through Saturday evening. North winds
near shore will be gusty Saturday afternoon and evening.
Sandler

MARINE...Updated 230 AM PDT Saturday 29 May 2021...The general
pattern will favor a thermal trough across northern California and
far southern Oregon. This pattern will keep gusty winds across the
waters of northern California and far southern Oregon with lighter
winds to the north into early next week.

While wind waves remain both dominant and highest over the southern
part of the waters, a northwest swell will continue to decay. This
will result in lowering seas north of Cape Arago through Sunday.
Seas will remain steep south of Cape Arago through Saturday evening,
except very steep south of Brookings.

Later Saturday night through Monday evening, seas will remain steep
south of Cape Blanco, though south of Pistol River there is the
potential for another brief episode of high and very steep seas with
winds approaching gale force Monday afternoon and evening.

There will be a trend of diminishing winds and seas as the thermal
trough pushes farther inland on Tuesday then low pressure disrupts
the pattern on Wednesday.
Sandler

&&

.MFR WATCHES/WARNINGS/ADVISORIES...
OR...Excessive Heat Watch from Tuesday morning through Wednesday
     evening for ORZ024-026.

CA...Excessive Heat Watch from Tuesday morning through Wednesday
     evening for CAZ080>082.

Pacific Coastal Waters...Small Craft Advisory until 11 PM PDT Monday for PZZ356-376.
     Small Craft Advisory until 11 PM PDT this evening for
     PZZ350-370.
     Hazardous Seas Warning until 11 PM PDT this evening for PZZ376.

The office that day

Everything else NWS Medford, OR issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 29, 3:07 AM PDTExcessive Heat WatchMFRSiskiyou10 hr

Nearby

Heat Advisories in Oregon, 2021Heat Advisories in California, 2021Every heat advisory in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.