Alert archive / Oregon / Red Flag Warnings in 2023

Red Flag Warning 9, NWS Medford, OR

August 2, 20235 counties in Oregon; Modoc County, Siskiyou County, California

NWS Medford, OR issued this red flag warning at Aug 2, 2023, 1:31 PM PDT for 5 counties in Oregon; Modoc County, Siskiyou County, California. It took effect at Aug 3, 2023, 11:00 AM PDT. It was in force for 35 hr. 6 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Aug 2, 2023, 1:31 PM PDT (20:31 UTC)
In effect from
Aug 3, 2023, 11:00 AM PDT
Expired
Aug 4, 2023, 9:32 PM PDT
In force
35 hr
Issued by
NWS Medford, OR

Counties Modoc County, CA, Siskiyou County, CA, Douglas County, OR, Harney County, OR, Jackson County, OR, Klamath County, OR, Lake County, OR

The radar

The Medford radar (KMAX), 114 km from the middle of the area, began a volume at 20:32 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.

What was reported inside it

TimeReportWhereRemark
Aug 4, 4:00 PM PDTRAIN 0.828 N Riley, ORMesonet station SNWO3 28.2 N Riley (SNOTEL).
Aug 4, 4:35 PM PDTRAIN 0.5527 N Riley, ORMesonet station ALFO3 Allison.
Aug 4, 5:50 PM PDTHAIL 1.5Rocky Point Resort, ORPing pong ball-sized hail and heavy rain reported by resort employee.
Aug 4, 5:55 PM PDTHAIL 1Harriman Springs Resort, ORQuarter-sized hail reported by resort employee.
Aug 4, 6:08 PM PDTFLOOD10 Se Andrews, ORA trained spotter reported frequent lightning and 1.0 inches of rain in 20 minutes causing over a foot of standing water in agricultural fields. He also reported that Trout Creek Road was impassable due to washed out portions of the road and one foot large roc
Aug 4, 6:15 PM PDTHAIL 0.88Badger Run Wildlife Reh, ORReport from Badger Run employee who was out feeding animals.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Medford/Jackson, OR (KMFR), launched 12:00Z, 8.5 hours before the alert went out and 111 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 2023-08-02Temperature 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 2023-08-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 6 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
1976 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
6 m²/s²
0-3 km storm-relative helicity
50 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

556 
WWUS86 KMFR 022031
RFWMFR

URGENT - FIRE WEATHER MESSAGE
National Weather Service Medford OR
131 PM PDT Wed Aug 2 2023

...Lightning activity will increase Thursday into Friday...

.Monsoonal moisture and an upper level low will kick off
thunderstorm activity east of the Cascades on Thursday. Storm 
activity has a moderate chance of continuing into Thursday night. 
Increased coverage of thunderstorm activity is anticipated Friday.
Storms on Thursday and Friday have a higher potential of being
dry.

ORZ625-031100-
/O.UPG.KMFR.FW.A.0007.230803T2100Z-230805T0600Z/
/O.NEW.KMFR.FW.W.0009.230803T1800Z-230805T0600Z/
South Central Oregon Desert including the BLM Land in Eastern
Lake and Western Harney Counties-
131 PM PDT Wed Aug 2 2023

...RED FLAG WARNING IN EFFECT FROM 11 AM THURSDAY TO 11 PM PDT
FRIDAY FOR ABUNDANT LIGHTNING ON DRY FUELS FOR FIRE WEATHER ZONE
625...

The National Weather Service in Medford has issued a Red Flag
Warning, which is in effect from 11 AM Thursday to 11 PM PDT
Friday. The Fire Weather Watch is no longer in effect. 

* IMPACTS...Any fires that develop have a higher probability of
  spreading rapidly. Abundant lightning under wetter storms can 
  also ignite new fires and strain fire fighting resources. 

* AFFECTED AREA...The entire zone of fire weather zone 625. 

* THUNDERSTORMS...Storms have a higher potential of being dry. 
  Thunderstorms are anticipated to cover more area and produce 
  more lightning on Friday. The probability of lightning within 25
  miles of any point in the warning area is roughly 50 percent 
  Friday.

* OUTFLOW WINDS...Gusts up to 40 mph.

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



PRECAUTIONARY/PREPAREDNESS ACTIONS...

Find links to restrictions at weather.gov/medford/wildfire. One 
less spark, one less wildfire.

Gather your fire evacuation kit now. Collect essentials you don't
want to lose and prioritize your checklist. Visit ready.gov/kit
for more information.

Familiarize yourself with your evacuation plan. Where will you
go? How will you get there? Who will you call to let others know
your are safe? Visit ready.gov/wildfires for more information.

A Red Flag Warning means that critical fire weather conditions
are expected to occur eventually. These conditions promote rapid 
spread of fire which may become life threatening. Evacuate if 
ordered to, or if a fire threatens.

&&

$$

ORZ624-031100-
/O.UPG.KMFR.FW.A.0007.230803T2100Z-230805T0600Z/
/O.NEW.KMFR.FW.W.0009.230804T1800Z-230805T0600Z/
Klamath Basin and the Fremont-Winema National Forest-
131 PM PDT Wed Aug 2 2023

...RED FLAG WARNING IN EFFECT FROM 11 AM TO 11 PM PDT FRIDAY FOR
ABUNDANT LIGHTNING ON DRY FUELS FOR FIRE WEATHER ZONE 624...

The National Weather Service in Medford has issued a Red Flag
Warning, which is in effect from 11 AM to 11 PM PDT Friday. The
Fire Weather Watch is no longer in effect. 

* IMPACTS...Any fires that develop have a higher probability of
  spreading rapidly. Abundant lightning under wetter storms can 
  also ignite new fires and strain fire fighting resources. 

* AFFECTED AREA...The entire area of fire weather zone 624. 
  Storms are anticipated to be more isolated within this zone on 
  Thursday and impact the eastern areas of the zone.
 
* THUNDERSTORMS...Storms have a higher potential of being dry.
  Thunderstorms are anticipated to cover more area and produce
  more lightning on Friday. The probability of lightning within 25
  miles of any point in the warning area is roughly 45 percent 
  Friday.

* OUTFLOW WINDS...Gusts up to 40 mph.

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


PRECAUTIONARY/PREPAREDNESS ACTIONS...

Find links to restrictions at weather.gov/medford/wildfire. One 
less spark, one less wildfire.

Gather your fire evacuation kit now. Collect essentials you don't
want to lose and prioritize your checklist. Visit ready.gov/kit
for more information.

Familiarize yourself with your evacuation plan. Where will you
go? How will you get there? Who will you call to let others know
your are safe? Visit ready.gov/wildfires for more information.

A Red Flag Warning means that critical fire weather conditions
are either occurring now or will shortly. These conditions
promote rapid spread of fire which may become life threatening.
Evacuate if ordered to, or if a fire threatens.

&&

$$

CAZ285-031100-
/O.NEW.KMFR.FW.W.0009.230804T1800Z-230805T0600Z/
Modoc County Except for the Surprise Valley-
131 PM PDT Wed Aug 2 2023

...RED FLAG WARNING IN EFFECT FROM 11 AM TO 11 PM PDT FRIDAY FOR
ABUNDANT LIGHTNING ON DRY FUELS FOR FIRE WEATHER ZONE 285...

The National Weather Service in Medford has issued a Red Flag
Warning, which is in effect from 11 AM to 11 PM PDT Friday. 

* IMPACTS...Any fires that develop have a higher probability of
  spreading rapidly. Abundant lightning under wetter storms can 
  also ignite new fires and strain fire fighting resources. 

* AFFECTED AREA...The entire area of fire weather zone 285. Storms
  are anticipated to be more isolated within this zone on Thursday
  and impact the eastern areas of the zone.

* THUNDERSTORMS...Storms have a higher potential of being dry.  
  The probability of lightning within 25 miles of any point in the
  warning area is roughly 40 percent Friday.

* OUTFLOW WINDS...Gusts up to 40 mph.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Find links to restrictions at weather.gov/medford/wildfire. One 
less spark, one less wildfire.

Gather your fire evacuation kit now. Collect essentials you don't
want to lose and prioritize your checklist. Visit ready.gov/kit
for more information.

Familiarize yourself with your evacuation plan. Where will you
go? How will you get there? Who will you call to let others know
your are safe? Visit ready.gov/wildfires for more information.

A Red Flag Warning means that critical fire weather conditions
are either occurring now or will shortly. These conditions
promote rapid spread of fire which may become life threatening.
Evacuate if ordered to, or if a fire threatens.

&&

$$


Visit us at www.weather.gov/Medford
5 follow-up statements
922 
WWUS86 KMFR 031018
RFWMFR

URGENT - FIRE WEATHER MESSAGE
National Weather Service Medford OR
318 AM PDT Thu Aug 3 2023

...Lightning Activity Will Increase Today Into Friday...

.Monsoonal moisture and an upper level low will kick off
thunderstorm activity east of the Cascades this afternoon. Storm 
activity has a moderate chance of continuing overnight, then 
increased coverage of thunderstorm activity is anticipated from
the Cascades eastward and in Siskiyou County Friday. Storms on 
Thursday and Friday have a high potential of being dry. A slight 
chance of thunderstorms will follow on Saturday afternoon.

ORZ625-032300-
/O.CON.KMFR.FW.W.0009.230803T1800Z-230805T0600Z/
South Central Oregon Desert including the BLM Land in Eastern
Lake and Western Harney Counties-
318 AM PDT Thu Aug 3 2023

...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO
11 PM PDT FRIDAY FOR ABUNDANT LIGHTNING ON DRY FUELS FOR FIRE
WEATHER ZONE 625...

* IMPACTS...Any fires that develop have a high probability of 
  spreading rapidly. Abundant lightning under wetter storms can 
  also ignite new fires and strain fire fighting resources. 

* AFFECTED AREA...The entire zone of fire weather zone 625.

* THUNDERSTORMS...Storms have a high potential of being dry. 
  Thunderstorms are anticipated to cover more area and produce 
  more lightning on Friday. The probability of lightning within 25
  miles of any point in the warning area is roughly 50 percent 
  Friday.

* OUTFLOW WINDS...Gusts up to 40 mph.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Find links to restrictions at weather.gov/medford/wildfire. One
less spark, one less wildfire.

Gather your fire evacuation kit now. Collect essentials you don't
want to lose and prioritize your checklist. Visit ready.gov/kit
for more information.

Familiarize yourself with your evacuation plan. Where will you
go? How will you get there? Who will you call to let others know
your are safe? Visit ready.gov/wildfires for more information.

A Red Flag Warning means that critical fire weather conditions
are expected to occur eventually. These conditions promote rapid
spread of fire which may become life threatening. Evacuate if
ordered to, or if a fire threatens.

&&

$$

CAZ285-ORZ624-032300-
/O.CON.KMFR.FW.W.0009.230804T1800Z-230805T0600Z/
Modoc County Except for the Surprise Valley-
Klamath Basin and the Fremont-Winema National Forest-
318 AM PDT Thu Aug 3 2023

...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM TO 11 PM PDT
FRIDAY FOR ABUNDANT LIGHTNING ON DRY FUELS FOR FIRE WEATHER ZONES
285 AND 624...

* IMPACTS...Any fires that develop have a high probability of 
  spreading rapidly. Abundant lightning under wetter storms can 
  also ignite new fires and strain fire fighting resources. 

* AFFECTED AREA...The entire area of fire weather zones 285 and
  624. Storms are anticipated to be isolated within eastern
  portions of these zones this afternoon and evening, before 
  activity increases on Friday. 

* THUNDERSTORMS...Storms have a higher potential of being dry. 
  The probability of lightning within 25 miles of any point in 
  the warning area is roughly 40 percent Friday. 

* OUTFLOW WINDS...Gusts up to 40 mph.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Find links to restrictions at weather.gov/medford/wildfire. One
less spark, one less wildfire.

Gather your fire evacuation kit now. Collect essentials you don't
want to lose and prioritize your checklist. Visit ready.gov/kit
for more information.

Familiarize yourself with your evacuation plan. Where will you
go? How will you get there? Who will you call to let others know
your are safe? Visit ready.gov/wildfires for more information.

A Red Flag Warning means that critical fire weather conditions
are either occurring now or will shortly. These conditions
promote rapid spread of fire which may become life threatening.
Evacuate if ordered to, or if a fire threatens.

&&

$$


Visit us at www.weather.gov/Medford
355 
WWUS86 KMFR 032121
RFWMFR

URGENT - FIRE WEATHER MESSAGE
National Weather Service Medford OR
221 PM PDT Thu Aug 3 2023

...Lightning Activity Contiues Into Friday...

.Thunderstorm activity is ongoing. Storm activity has a moderate 
chance of continuing overnight, then increased coverage of 
thunderstorm activity is anticipated from the Cascades eastward 
and in Siskiyou County Friday. Storms on Thursday and Friday have 
a high potential of being dry. A slight chance of thunderstorms 
will follow on Saturday afternoon.

ORZ625-041100-
/O.CON.KMFR.FW.W.0009.000000T0000Z-230805T0600Z/
South Central Oregon Desert including the BLM Land in Eastern
Lake and Western Harney Counties-
221 PM PDT Thu Aug 3 2023

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 11 PM PDT FRIDAY FOR
ABUNDANT LIGHTNING ON DRY FUELS FOR FIRE WEATHER ZONE 625...

* IMPACTS...Any fires that develop have a high probability of 
  spreading rapidly. Abundant lightning under wetter storms can 
  also ignite new fires and strain fire fighting resources. 

* AFFECTED AREA...The entire zone of fire weather zone 625.

* THUNDERSTORMS...Storms have a high potential of being dry.
  Thunderstorms are anticipated to cover more area and produce
  more lightning on Friday. The probability of lightning within 25
  miles of any point in the warning area is roughly 75 percent 
  Friday.

* OUTFLOW WINDS...Gusts up to 45 mph.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Find links to restrictions at weather.gov/medford/wildfire. One
less spark, one less wildfire.

Gather your fire evacuation kit now. Collect essentials you don't
want to lose and prioritize your checklist. Visit ready.gov/kit
for more information.

Familiarize yourself with your evacuation plan. Where will you
go? How will you get there? Who will you call to let others know
your are safe? Visit ready.gov/wildfires for more information.

A Red Flag Warning means that critical fire weather conditions
are expected to occur eventually. These conditions promote rapid
spread of fire which may become life threatening. Evacuate if
ordered to, or if a fire threatens.

&&

$$

CAZ285-ORZ624-041100-
/O.CON.KMFR.FW.W.0009.230804T1800Z-230805T0600Z/
Modoc County Except for the Surprise Valley-
Klamath Basin and the Fremont-Winema National Forest-
221 PM PDT Thu Aug 3 2023

...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM TO 11 PM PDT
FRIDAY FOR ABUNDANT LIGHTNING ON DRY FUELS FOR FIRE WEATHER ZONES
285 AND 624...

* IMPACTS...Any fires that develop have a high probability of 
  spreading rapidly. Abundant lightning under wetter storms can 
  also ignite new fires and strain fire fighting resources. 

* AFFECTED AREA...The entire area of fire weather zones 285 and 
  624. Storms are anticipated to be isolated within eastern 
  portions of these zones this afternoon and evening, before 
  activity increases on Friday.

* THUNDERSTORMS...Storms have a higher potential of being dry. The
  probability of lightning within 25 miles of any point in the
  warning area is roughly 75 percent Friday.

* OUTFLOW WINDS...Gusts up to 45 mph.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Find links to restrictions at weather.gov/medford/wildfire. One
less spark, one less wildfire.

Gather your fire evacuation kit now. Collect essentials you don't
want to lose and prioritize your checklist. Visit ready.gov/kit
for more information.

Familiarize yourself with your evacuation plan. Where will you
go? How will you get there? Who will you call to let others know
your are safe? Visit ready.gov/wildfires for more information.

A Red Flag Warning means that critical fire weather conditions
are either occurring now or will shortly. These conditions
promote rapid spread of fire which may become life threatening.
Evacuate if ordered to, or if a fire threatens.

&&

$$


Visit us at www.weather.gov/Medford
980 
WWUS86 KMFR 041018
RFWMFR

URGENT - FIRE WEATHER MESSAGE
National Weather Service Medford OR
318 AM PDT Fri Aug 4 2023

...Scattered to Numerous Afternoon and Evening Thunderstorms...

.Increased coverage of thunderstorm activity is anticipated from 
the Cascades eastward and in Siskiyou County this afternoon and
evening. Though activity will peak this evening, a slight chance 
to chance of thunderstorms will follow in much the same area on 
Saturday afternoon and evening.

CAZ284-050600-
/O.EXA.KMFR.FW.W.0009.230804T1800Z-230805T0600Z/
Siskiyou County from the Cascade Mountains East and South to Mt
Shasta-
318 AM PDT Fri Aug 4 2023

...RED FLAG WARNING IN EFFECT FROM 11 AM THIS MORNING TO 11 PM
PDT THIS EVENING FOR ABUNDANT LIGHTNING ON DRY FUELS FOR FIRE
WEATHER ZONE 284...

The National Weather Service in Medford has issued a Red Flag
Warning, which is in effect from 11 AM this morning to 11 PM PDT
this evening. 

* IMPACTS...Any fires that develop have a high probability of 
  spreading rapidly. Abundant lightning under wetter storms can 
  also ignite new fires and strain fire fighting resources. 

* AFFECTED AREA...The entire area of fire weather zone 284,
  covering eastern Siskiyou County.

* THUNDERSTORMS...The probability of lightning within 25 miles of
  any point in the warning area is roughly 75 percent. 

* OUTFLOW WINDS...Gusts up to 45 mph.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Find links to restrictions at weather.gov/medford/wildfire. One
less spark, one less wildfire.

Gather your fire evacuation kit now. Collect essentials you don't
want to lose and prioritize your checklist. Visit ready.gov/kit
for more information.

Familiarize yourself with your evacuation plan. Where will you
go? How will you get there? Who will you call to let others know
your are safe? Visit ready.gov/wildfires for more information.

A Red Flag Warning means that critical fire weather conditions
are either occurring now or will shortly. These conditions
promote rapid spread of fire which may become life threatening.
Evacuate if ordered to, or if a fire threatens.

&&

$$

CAZ285-ORZ624-050600-
/O.CON.KMFR.FW.W.0009.230804T1800Z-230805T0600Z/
Modoc County Except for the Surprise Valley-
Klamath Basin and the Fremont-Winema National Forest-
318 AM PDT Fri Aug 4 2023

...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO
11 PM PDT THIS EVENING FOR ABUNDANT LIGHTNING ON DRY FUELS FOR
FIRE WEATHER ZONES 285 AND 624...

* IMPACTS...Any fires that develop have a high probability of 
  spreading rapidly. Abundant lightning under wetter storms can 
  also ignite new fires and strain fire fighting resources. 

* AFFECTED AREA...The entire area of fire weather zones 285 and
  624, covering Modoc County and much of south central Oregon. 

* THUNDERSTORMS...The probability of lightning within 25 miles of
  any point in the warning area is roughly 75 percent. 

* OUTFLOW WINDS...Gusts up to 45 mph.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Find links to restrictions at weather.gov/medford/wildfire. One
less spark, one less wildfire.

Gather your fire evacuation kit now. Collect essentials you don't
want to lose and prioritize your checklist. Visit ready.gov/kit
for more information.

Familiarize yourself with your evacuation plan. Where will you
go? How will you get there? Who will you call to let others know
your are safe? Visit ready.gov/wildfires for more information.

A Red Flag Warning means that critical fire weather conditions
are either occurring now or will shortly. These conditions
promote rapid spread of fire which may become life threatening.
Evacuate if ordered to, or if a fire threatens.

&&

$$

ORZ625-050600-
/O.CON.KMFR.FW.W.0009.000000T0000Z-230805T0600Z/
South Central Oregon Desert including the BLM Land in Eastern
Lake and Western Harney Counties-
318 AM PDT Fri Aug 4 2023

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 11 PM PDT THIS
EVENING FOR ABUNDANT LIGHTNING ON DRY FUELS FOR FIRE WEATHER ZONE
625...

* IMPACTS...Any fires that develop have a high probability of 
  spreading rapidly. Abundant lightning under wetter storms can 
  also ignite new fires and strain fire fighting resources. 

* AFFECTED AREA...The entire area of fire weather zone 625,
  covering the eastern portion of south central Oregon.

* THUNDERSTORMS...The probability of lightning within 25 miles of
  any point in the warning area is roughly 75 percent.

* OUTFLOW WINDS...Gusts up to 45 mph.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Find links to restrictions at weather.gov/medford/wildfire. One
less spark, one less wildfire.

Gather your fire evacuation kit now. Collect essentials you don't
want to lose and prioritize your checklist. Visit ready.gov/kit
for more information.

Familiarize yourself with your evacuation plan. Where will you
go? How will you get there? Who will you call to let others know
your are safe? Visit ready.gov/wildfires for more information.

A Red Flag Warning means that critical fire weather conditions
are expected to occur eventually. These conditions promote rapid
spread of fire which may become life threatening. Evacuate if
ordered to, or if a fire threatens.

&&

$$


Visit us at www.weather.gov/Medford
353 
WWUS86 KMFR 041531
RFWMFR

URGENT - FIRE WEATHER MESSAGE
National Weather Service Medford OR
831 AM PDT Fri Aug 4 2023

...Scattered to Numerous Afternoon and Evening Thunderstorms...

.Increased coverage of thunderstorm activity is anticipated from
the Cascades eastward and in Siskiyou County this afternoon and
evening. Though activity will peak this evening, a slight chance
to chance of thunderstorms will follow in much the same area on
Saturday afternoon and evening.

ORZ623-050345-
/O.EXA.KMFR.FW.W.0009.230804T1800Z-230805T0600Z/
Southern Oregon Cascades-
831 AM PDT Fri Aug 4 2023

...RED FLAG WARNING IN EFFECT UNTIL 11 PM PDT THIS EVENING FOR
ABUNDANT LIGHTNING ON DRY FUELS FOR FIRE WEATHER ZONE 623...

The National Weather Service in Medford has issued a Red Flag
Warning, which is in effect until 11 PM PDT this evening. 

* IMPACTS...Any fires that develop have a high probability of 
  spreading rapidly. Abundant lightning under wetter storms can 
  also ignite new fires and strain fire fighting resources. 

* AFFECTED AREA...The entire area of fire weather zone 623 and 
  covering the Cascades.

* THUNDERSTORMS...The probability of lightning within 25 miles
  of any point in the warning area is roughly 80 percent. 

* OUTFLOW WINDS...Gusts up to 35 mph.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Find links to restrictions at weather.gov/medford/wildfire. One
less spark, one less wildfire.

Gather your fire evacuation kit now. Collect essentials you don't
want to lose and prioritize your checklist. Visit ready.gov/kit
for more information.

Familiarize yourself with your evacuation plan. Where will you
go? How will you get there? Who will you call to let others know
your are safe? Visit ready.gov/wildfires for more information.

A Red Flag Warning means that critical fire weather conditions
are either occurring now or will shortly. These conditions
promote rapid spread of fire which may become life threatening.
Evacuate if ordered to, or if a fire threatens.

&&

$$

CAZ284-285-ORZ624-050345-
/O.CON.KMFR.FW.W.0009.230804T1800Z-230805T0600Z/
Siskiyou County from the Cascade Mountains East and South to Mt
Shasta-Modoc County Except for the Surprise Valley-
Klamath Basin and the Fremont-Winema National Forest-
831 AM PDT Fri Aug 4 2023

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 11 PM PDT THIS
EVENING FOR ABUNDANT LIGHTNING ON DRY FUELS FOR FIRE WEATHER
ZONES 284, 285, AND 624...

* IMPACTS...Any fires that develop have a high probability of 
  spreading rapidly. Abundant lightning under wetter storms can 
  also ignite new fires and strain fire fighting resources. 

* AFFECTED AREA...The entire areas of fire weather zones 284, 
  285, AND 624. 

* THUNDERSTORMS...The probability of lightning within 25 miles
  of any point in the warning area is roughly 85 percent. 

* OUTFLOW WINDS...Gusts up to 45 mph.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Find links to restrictions at weather.gov/medford/wildfire. One
less spark, one less wildfire.

Gather your fire evacuation kit now. Collect essentials you don't
want to lose and prioritize your checklist. Visit ready.gov/kit
for more information.

Familiarize yourself with your evacuation plan. Where will you
go? How will you get there? Who will you call to let others know
your are safe? Visit ready.gov/wildfires for more information.

A Red Flag Warning means that critical fire weather conditions
are either occurring now or will shortly. These conditions
promote rapid spread of fire which may become life threatening.
Evacuate if ordered to, or if a fire threatens.

&&

$$

ORZ625-050345-
/O.CON.KMFR.FW.W.0009.000000T0000Z-230805T0600Z/
South Central Oregon Desert including the BLM Land in Eastern
Lake and Western Harney Counties-
831 AM PDT Fri Aug 4 2023

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 11 PM PDT THIS
EVENING FOR ABUNDANT LIGHTNING ON DRY FUELS FOR FIRE WEATHER ZONE
625...

* IMPACTS...Any fires that develop have a high probability of 
  spreading rapidly. Abundant lightning under wetter storms can 
  also ignite new fires and strain fire fighting resources. 

* AFFECTED AREA...The entire area of fire weather zone 625, 
  covering the eastern portion of south central Oregon.

* THUNDERSTORMS...The probability of lightning within 25 miles 
  of any point in the warning area is roughly 75 percent. 

* OUTFLOW WINDS...Gusts up to 45 mph.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Find links to restrictions at weather.gov/medford/wildfire. One
less spark, one less wildfire.

Gather your fire evacuation kit now. Collect essentials you don't
want to lose and prioritize your checklist. Visit ready.gov/kit
for more information.

Familiarize yourself with your evacuation plan. Where will you
go? How will you get there? Who will you call to let others know
your are safe? Visit ready.gov/wildfires for more information.

A Red Flag Warning means that critical fire weather conditions
are expected to occur eventually. These conditions promote rapid
spread of fire which may become life threatening. Evacuate if
ordered to, or if a fire threatens.

&&

$$


Visit us at www.weather.gov/Medford
432 
WWUS86 KMFR 050432
RFWMFR

URGENT - FIRE WEATHER MESSAGE
National Weather Service Medford OR
932 PM PDT Fri Aug 4 2023

CAZ284-285-ORZ623>625-050545-
/O.CAN.KMFR.FW.W.0009.000000T0000Z-230805T0600Z/
Siskiyou County from the Cascade Mountains East and South to Mt
Shasta-Modoc County Except for the Surprise Valley-
Southern Oregon Cascades-Klamath Basin and the Fremont-
Winema National Forest-
South Central Oregon Desert including the BLM Land in Eastern
Lake and Western Harney Counties-
932 PM PDT Fri Aug 4 2023

...RED FLAG WARNING BEEN ENDED EARLY FOR FOR FIRE WEATHER ZONES 
284, 285, 623, 624, AND 625...

The National Weather Service in Medford has ended the Red Flag 
Warning early. 

Storms have died out for tonight. More storms are expected on
Saturday in similar areas.

$$


Visit us at www.weather.gov/Medford

What forecasters said that day

The local office's own words before this red flag warning 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 red flag warning went out at Aug 2, 8:44 AM PDT, 4 hours 47 minutes earlier.

Area forecast discussion, Aug 2, 8:44 AM PDT, 4 hours 47 minutes before
Area Forecast Discussion
National Weather Service Medford OR
844 AM PDT Wed Aug 2 2023

.DISCUSSION...The latest satellite image shows smoke settling into
portions of Douglas County and Klamath County from the Bedrock
Fire and the Illinois Valley from the Flat Fire. As we get further
along into the morning. mixing will increase which will aid in
dispersing the smoke. However breezy northwest winds will bring
smoke back into portions of Klamath and Lake County later this
afternoon and evening.

Marine stratus remains along the coast and coastal river valleys,
although the stratus away from the coast is gradually burning off.
The marine stratus will continue to persist along the coast for
most of the day.

Today will be dry, then the focus of concern will be Thursday and
Friday for thunderstorms, primarily in northern California and
east of the Cascades. One thing of note, a couple of the high res
model wind fields suggest there could be moderate to strong outflow
winds near thunderstorms both Thursday and Friday later in the
afternoon and early evening.

The forecast for today is pretty much on track. Other than adding
some detail to the sky cover for today, no other changes are
needed. -Petrucelli

&&

.AVIATION...02/12Z TAFs...A marine layer is resulting in IFR
ceilings for North Bend. This will likely continue through the
morning before some relief in the daytime; however, ceilings will
likely go back down to IFR once the marine layer reestablishes
tonight. Elsewhere, our inland TAF sites will experience VFR
conditions throughout the valid TAF period.

-Guerrero

&&

.MARINE...Updated 840 AM PDT Wednesday, August 2, 2023...North winds
will continue to diminish today, resulting calmer conditions for the
next couple of days. The thermal trough will once again strengthen,
and this could allow for wind driven seas to become steep, possibly
starting as early as late Friday afternoon, but more likely Friday
night and continue through at least the weekend. This is especially
true for areas south of Cape Blanco where the strongest winds are
forecast. -Guerrero/Petrucelli

&&

.PREV DISCUSSION... /Issued 507 AM PDT Wed Aug 2 2023/

DISCUSSION...The focus for the updated forecast was upon fine
tuning the probability of thunderstorms this afternoon through
Sunday evening. As low pressure over western Canada tracks
northeastward today, another weaker trough will track toward the
Oregon coast and monsoonal moisture over Nevada will move north-
northwestward toward Lake and Modoc counties. By this evening,
weak instability with a 10% to 15 % probability of thunderstorms
will just extend to the eastern edge of our area, around Wagontire
and Hart Mountain.

The Pacific trough will move closer to the coast Thursday then
inland Friday. The Fire Weather Watch remains in effect east of
the Cascades for Thursday through Friday. A slight chance to
chance of thunderstorms (15% to 25%) will develop east of the
Cascades Thursday, a slight chance of thunderstorms (5% to 15%)
may linger overnight, then a higher probability (20% to 40%)
develops over a broader area, from the Cascades eastward and also
into southwest Siskiyou County, Friday afternoon and evening.

The trough is expected to shift east of the Cascades Saturday with
weak instability and a 10% to 30% probability of thunderstorms
again late in the day for the east side. Also as a result, a
warming trend will begin Saturday. The warming trend will continue
Sunday into Monday with the air mass expected to stabilize as a
ridge builds east into our area. From today through the weekend,
temperatures and breezy afternoon winds will be near to slightly
above normal. Meantime, coastal conditions are expected to remain
cool with night and morning stratus mainly north of Cape Blanco...
into the lower Umpqua and Coquille valleys.

Uncertainty in the forecast increases beyond Sunday, but a
maritime influenced westerly flow aloft will bring the
aforementioned stable air mass, and some modest cooling for
Tuesday and Wednesday.

&&

FIRE WEATHER...Updated 300 AM PDT Wednesday, August 2, 2023...The
Fire Weather Watch remains in effect for FWZ-624/625 starting
Thursday east of the Cascades, continuing through Friday as there is
an increased chance for thunderstorms from the Cascades eastward.
The chance of lightning east of the Cascades is 20-30% Thursday
afternoon, 30-50% Friday afternoon. Saturday, thunderstorm chances
are lower, (15-30%), with highest probability over the higher
terrain north and east of Klamath Falls.

There is higher confidence that storms will start off dry on
Thursday, even under the storm cores. By Friday, storms are expected
to moisten up, with the chance of a wetting rain (greater than 0.1")
increasing up to 10%. Storms on Thursday and Friday should have a
northbound storm motion at about 15 mph, and on Saturday, storms are
forecasted to move east at around 5-10 mph.

First, a ridge of high pressure will persist today with slightly
above normal temperatures, and normal to slightly stronger than
normal winds. At their peak late this afternoon, winds west of the
Cascades will be in critical values again today.

A stable air mass may develop by Sunday, and is expected Monday in
to Wednesday. A coastal thermal trough is expected along the
southern coast today into the weekend.  This will result in modest
north east winds around the Flat fire and light northerly winds over
the. Golden fire. Temperatures will trend higher while humidities
will trend lower. In addition, the overnight marine push to the
coast north of Cape Blanco and into coastal valleys should continue
each night into early next week.

-Danny/Smith/DW

&&

.MFR WATCHES/WARNINGS/ADVISORIES...
OR...Fire Weather Watch from Thursday afternoon through Friday
     evening for ORZ624-625.

CA...None.

PACIFIC COASTAL WATERS...None.

&&

Nearby

Red Flag Warnings in Oregon, 2023Red Flag Warnings in California, 2023Every red flag warning in 2023

Sources

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