Alert archive / Oregon / Winter Storm Warnings in 2017

Winter Storm Warning 17, NWS Medford, OR

November 15, 2017Siskiyou County, California; 4 counties in Oregon

NWS Medford, OR issued this winter storm warning at Nov 15, 2017, 10:14 PM PST for Siskiyou County, California; 4 counties in Oregon. It was in force for 33 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Nov 15, 2017, 10:14 PM PST (06:14 UTC)
Expired
Nov 17, 2017, 7:00 AM PST
In force
33 hr
Issued by
NWS Medford, OR

Counties Siskiyou County, CA, Douglas County, OR, Jackson County, OR, Josephine County, OR, Klamath County, OR

The radar

The Medford radar (KMAX), 44 km from the middle of the area, began a volume at 06:15 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 00:00Z, 6.2 hours before the alert went out and 13 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 00:00Z on 2017-11-16Temperature 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 00:00Z on 2017-11-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 145 square meters per square second.1939587897117Sfc1 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
1019 m above ground
0-6 km bulk shear
82 kt
0-1 km storm-relative helicity
145 m²/s²
0-3 km storm-relative helicity
451 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

972 
WWUS46 KMFR 160614
WSWMFR

URGENT - WINTER WEATHER MESSAGE
National Weather Service Medford OR
1014 PM PST Wed Nov 15 2017

CAZ083-161415-
/O.EXP.KMFR.WS.W.0016.000000T0000Z-171116T0600Z/
/O.NEW.KMFR.WS.W.0017.171116T0614Z-171117T0600Z/
/O.EXT.KMFR.WW.Y.0038.000000T0000Z-171117T0600Z/
North Central and Southeast Siskiyou County-
Including the city of Tennant
1014 PM PST Wed Nov 15 2017

...WINTER STORM WARNING IN EFFECT UNTIL 10 PM PST THURSDAY
   ABOVE 4000 FEET...
...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 10 PM PST 
   THURSDAY...

* WHAT...Heavy snow occurring. Plan on difficult travel
  conditions, including during the evening commute on Thursday.
  Tree branches could fall as well. Additional snow accumulations
  of up to 7 inches, with localized amounts up to 12 inches, are 
  expected. 

* WHERE...North Central and Southeast Siskiyou County.

* WHEN...For the Winter Storm Warning, until 10 PM Thursday. The 
  heaviest snowfall rates will occur between 4 PM and 10 PM 
  Thursday. For the Winter Weather Advisory, until 10 PM 
  Thursday. The heaviest snowfall rates will occur between 4 PM 
  and 10 PM Thursday.

* ADDITIONAL DETAILS...Look for significant reductions in 
  visibility at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

* Travel is strongly discouraged because of dangerous conditions.

* If you must travel, keep tire chains, a flashlight, blankets, 
  food, water, medications, and a fully charged phone with you.

* The safest place during a winter storm is indoors.

* A Winter Storm Warning means that severe winter weather is
  occurring and poses a threat to life and property. Take 
  protective action now.

&&

$$

CAZ080-ORZ027-028-161415-
/O.EXP.KMFR.WS.W.0016.000000T0000Z-171116T0600Z/
/O.NEW.KMFR.WS.W.0017.171116T0614Z-171117T0600Z/
Western Siskiyou County-South Central Oregon Cascades-
Siskiyou Mountains and Southern Oregon Cascades-
Including the cities of Crater Lake, Crescent Lake, Diamond Lake,
Howard Prairie, and Siskiyou Summit
1014 PM PST Wed Nov 15 2017

...WINTER STORM WARNING IN EFFECT UNTIL 10 PM PST THURSDAY ABOVE
   4000 FEET...

* WHAT...Heavy snow occurring. Travel will be very difficult to
  impossible, including during the morning commute on Thursday.
  Additional snow accumulations of up to 15 inches, with localized
  amounts up to 20 inches, are expected.

* WHERE...In California, Western Siskiyou County. In Oregon, 
  South Central Oregon Cascades and Siskiyou Mountains and 
  Southern Oregon Cascades.

* WHEN...Until 10 PM Thursday. The heaviest snowfall rates will 
  occur between 4 AM and 10 AM Thursday.

* ADDITIONAL DETAILS...Look for significant reductions in 
  visibility at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

* Travel is strongly discouraged because of dangerous conditions.

* If you must travel, keep tire chains, a flashlight, blankets, 
  food, water, medications, and a fully charged phone with you.

* The safest place during a winter storm is indoors.

* A Winter Storm Warning means that severe winter weather is 
  occurring and poses a threat to life and property. Take 
  protective action now.

&&

$$

CAZ082-161415-
/O.EXP.KMFR.WS.W.0016.000000T0000Z-171116T0600Z/
/O.NEW.KMFR.WS.W.0017.171116T0614Z-171117T0600Z/
South Central Siskiyou County-
1014 PM PST Wed Nov 15 2017

...WINTER STORM WARNING IN EFFECT UNTIL 10 PM PST THURSDAY ABOVE
   4000 FEET...

* WHAT...Heavy snow occurring. Plan on difficult travel
  conditions, including during the morning commute on Thursday.
  Tree branches could fall as well. Additional snow accumulations
  of up to 7 inches, with localized amounts up to 12 inches, are 
  expected.

* WHERE...South Central Siskiyou County.

* WHEN...Until 10 PM Thursday. 

* ADDITIONAL DETAILS...Look for significant reductions in 
  visibility at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

* Travel is strongly discouraged because of dangerous conditions.

* If you must travel, keep tire chains, a flashlight, blankets, 
  food, water, medications, and a fully charged phone with you.

* The safest place during a winter storm is indoors.

* A Winter Storm Warning means that severe winter weather is 
  occurring and poses a threat to life and property. Take 
  protective action now.

&&

$$
6 follow-up statements
387 
WWUS46 KMFR 161219
WSWMFR

URGENT - WINTER WEATHER MESSAGE
National Weather Service Medford OR
419 AM PST Thu Nov 16 2017

CAZ083-162030-
/O.EXT.KMFR.WS.W.0017.000000T0000Z-171117T1200Z/
/O.EXT.KMFR.WW.Y.0038.000000T0000Z-171117T1200Z/
North Central and Southeast Siskiyou County-
Including the city of Tennant
419 AM PST Thu Nov 16 2017

...WINTER STORM WARNING NOW IN EFFECT UNTIL 4 AM PST FRIDAY...
...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 4 AM PST FRIDAY...

* WHAT...Heavy snow occurring. Plan on difficult travel
  conditions. Additional snow accumulations of 3 to 6 inches, with
  localized amounts up to 10 inches, are expected. 

* WHERE...North Central and Southeast Siskiyou County.

* WHEN...For the Winter Storm Warning and Advisory, until 4 AM
  Friday. The heaviest snowfall rates will occur between 4 PM
  Thursday and 1 AM Friday. 

* ADDITIONAL DETAILS...Look for significant reductions in 
  visibility at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

* If you must travel, keep tire chains, a flashlight, blankets,
  food, water, medications, and a fully charged phone with you.

* A Winter Storm Warning means that severe winter weather is
  occurring and poses a threat to life and property. Take 
  protective action now.

&&

$$

CAZ080-ORZ027-028-162030-
/O.EXT.KMFR.WS.W.0017.000000T0000Z-171117T1200Z/
Western Siskiyou County-South Central Oregon Cascades-
Siskiyou Mountains and Southern Oregon Cascades-
Including the cities of Crater Lake, Crescent Lake, Diamond Lake,
Howard Prairie, and Siskiyou Summit
419 AM PST Thu Nov 16 2017

...WINTER STORM WARNING NOW IN EFFECT UNTIL 4 AM PST FRIDAY ABOVE
4000 FEET...

* WHAT...Heavy snow occurring. Plan on difficult travel
  conditions. Additional snow accumulations of 10 to 15 inches.

* WHERE...In California, Western Siskiyou County. In Oregon, 
  South Central Oregon Cascades and Siskiyou Mountains and 
  Southern Oregon Cascades.

* WHEN...Until 4 AM Friday. The heaviest snowfall rates will occur
  between 4 PM Thursday and 1 AM Friday morning.

* ADDITIONAL DETAILS...Look for significant reductions in 
  visibility at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

* If you must travel, keep tire chains, a flashlight, blankets,
  food, water, medications, and a fully charged phone with you.

* A Winter Storm Warning means that severe winter weather is
  occurring and poses a threat to life and property. Take 
  protective action now.

&&

$$

CAZ082-162030-
/O.EXT.KMFR.WS.W.0017.000000T0000Z-171117T1200Z/
South Central Siskiyou County-
419 AM PST Thu Nov 16 2017

...WINTER STORM WARNING NOW IN EFFECT UNTIL 4 AM PST FRIDAY ABOVE
4000 FEET...

* WHAT...Heavy snow occurring. Plan on difficult travel
  conditions. Additional snow accumulations of 4 to 8 are 
  expected.

* WHERE...South Central Siskiyou County.

* WHEN...Until 4 AM Friday. The heaviest snowfall rates will occur
  between 4 PM Thursday and 1 AM Friday.

* ADDITIONAL DETAILS...Look for significant reductions in 
  visibility at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

* If you must travel, keep tire chains, a flashlight, blankets, 
  food, water, medications, and a fully charged phone with you.

* The safest place during a winter storm is indoors.

* A Winter Storm Warning means that severe winter weather is 
  occurring and poses a threat to life and property. Take 
  protective action now.

&&

$$

ORZ029-030-162030-
/O.EXB.KMFR.WW.Y.0038.171116T1219Z-171117T1200Z/
Klamath Basin-
Northern and Eastern Klamath County and Western Lake County-
Including the cities of Chemult, Crescent, and Gilchrist
419 AM PST Thu Nov 16 2017

...WINTER WEATHER ADVISORY IN EFFECT UNTIL 4 AM PST FRIDAY...

* WHAT...Snow expected. Plan on slippery road conditions. Total
  snow accumulations of 3 to 6 inches.

* WHERE...Klamath Basin and Northern and Eastern Klamath County 
  and Western Lake County.

* WHEN...Until 4 AM Friday. The heaviest snowfall rates will occur
  between 4 PM Thursday and 1 AM Friday.

* ADDITIONAL DETAILS...Look for reduced visibilities at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

* Slow down and allow extra time to reach your destination.

* Carry tire chains and be prepared for snow covered roads and 
  limited visibilities.

* See https://www.tripcheck.com for latest road conditions.

* A Winter Weather Advisory for snow means that periods of snow 
  will cause travel difficulties.

&&

$$
808 
WWUS46 KMFR 161741
WSWMFR

URGENT - WINTER WEATHER MESSAGE
National Weather Service Medford OR
941 AM PST Thu Nov 16 2017

CAZ082-171200-
/O.CAN.KMFR.WS.W.0017.000000T0000Z-171117T1200Z/
/O.EXA.KMFR.WW.Y.0038.000000T0000Z-171117T1200Z/
South Central Siskiyou County-
941 AM PST Thu Nov 16 2017

...WINTER WEATHER ADVISORY IN EFFECT UNTIL 4 AM PST FRIDAY...
...WINTER STORM WARNING IS CANCELLED...

* WHAT...Snow expected. Plan on difficult travel conditions. Total
  snow accumulations of 4 to 8 inches with localized amounts of 12
  inches above 6500 feet.

* WHERE...Elevations above 5000 feet in North Central and
  Southeast Siskiyou County to include Everitt Memorial Highway.

* WHEN...10 AM to 4 AM Friday. 

* ADDITIONAL DETAILS...Prepare for slippery roads and reduced 
  visibilities at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

* Slow down and allow extra time to reach your destination.

* Carry tire chains and be prepared for snow covered roads and 
  limited visibilities.

* See http://www.wrh.noaa.gov/mfr/cams for latest road 
  conditions.

* A Winter Weather Advisory for snow means that periods of snow
  will cause travel difficulties.


&&

$$

CAZ083-171200-
/O.CAN.KMFR.WS.W.0017.000000T0000Z-171117T1200Z/
/O.CON.KMFR.WW.Y.0038.000000T0000Z-171117T1200Z/
North Central and Southeast Siskiyou County-
941 AM PST Thu Nov 16 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 4 AM PST
FRIDAY...
...WINTER STORM WARNING IS CANCELLED...

* WHAT...Snow expected. Plan on difficult travel conditions. Total
  snow accumulations of 4 to 8 inches with localized amounts of 12
  inches above 6500 feet.

* WHERE...Elevations above 5000 feet in North Central and
  Southeast Siskiyou County.

* WHEN...10 AM to 4 AM Friday. 

* ADDITIONAL DETAILS...Prepare for slippery roads and reduced 
  visibilities at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

* Slow down and allow extra time to reach your destination.

* Carry tire chains and be prepared for snow covered roads and 
  limited visibilities.

* See http://www.wrh.noaa.gov/mfr/cams for latest road 
  conditions.

* A Winter Weather Advisory for snow means that periods of snow 
  will cause travel difficulties.


&&

$$

ORZ028-171200-
/O.EXA.KMFR.WW.Y.0038.000000T0000Z-171117T1200Z/
/O.CON.KMFR.WS.W.0017.000000T0000Z-171117T1200Z/
Siskiyou Mountains and Southern Oregon Cascades-
Including the cities of Howard Prairie and Siskiyou Summit
941 AM PST Thu Nov 16 2017

...WINTER WEATHER ADVISORY IN EFFECT UNTIL 4 AM PST FRIDAY ABOVE
4000 FEET...
...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 AM PST FRIDAY
ABOVE 4000 FEET...

* WHAT...Moderate to heavy snow expected above 4000 feet. Travel
  will be very difficult to impossible. In the Warning area, 
  above 4000 feet, additional snow accumulations of 8 to 14 inches
  are expected. Above 4000 feet, in the advisory area, additional
  snow accumulations of 4 to 8 inches are expected.

* WHERE...Siskiyou Mountains and Southern Oregon Cascades. Winter
  Storm Warning for areas from Lake of the Woods northward to 
  include Highway 140 and Highway 62 above 4000 feet. Winter 
  Weather Advisory south of Lake of the Woods to include Highway 
  66 and Siskiyou Summit on I-5. 

* WHEN...Until 4 AM Friday. The heaviest snowfall rates will occur
  late this afternoon and early evening. 

* ADDITIONAL DETAILS...Look for snow covered roads and significant
  reductions in visibility at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

* Travel is strongly discouraged because of dangerous conditions.

* If you must travel, keep tire chains, a flashlight, blankets, 
  food, water, medications, and a fully charged phone with you.

* The safest place during a winter storm is indoors.

* A Winter Storm Warning means that severe winter weather is
  occurring and poses a threat to life and property. Take 
  protective action now.

* A Winter Weather Advisory for snow means that periods of snow 
  will cause travel difficulties.

&&

$$

CAZ080-171200-
/O.CON.KMFR.WS.W.0017.000000T0000Z-171117T1200Z/
Western Siskiyou County-
941 AM PST Thu Nov 16 2017

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 AM PST FRIDAY...

* WHAT...Heavy snow occurring. Plan on difficult travel 
  conditions, including during the evening commute. Additional 
  snow accumulations of up to 8 inches, with localized amounts 
  up to 14 inches, are expected.

* WHERE...Western Siskiyou County above 4000 feet to include Etna
  Summit on Sawyers Bar Road and Scott Mountain Pass on Highway 3.

* WHEN...Until 4 AM Friday.

* ADDITIONAL DETAILS...Prepare for slippery roads and reduced 
  visibilities at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

* Travel is strongly discouraged because of dangerous conditions.

* If you must travel, keep tire chains, a flashlight, blankets, 
  food, water, medications, and a fully charged phone with you.

* The safest place during a winter storm is indoors.

* A Winter Storm Warning means that severe winter weather is
  occurring and poses a threat to life and property. Take 
  protective action now.

&&

$$

ORZ027-171200-
/O.CON.KMFR.WS.W.0017.000000T0000Z-171117T1200Z/
South Central Oregon Cascades-
Including the cities of Crater Lake, Crescent Lake, 
and Diamond Lake
941 AM PST Thu Nov 16 2017

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 AM PST FRIDAY
ABOVE 4000 FEET...

* WHAT...Heavy snow occurring. Travel will be very difficult to 
  impossible. Additional snow accumulations of 10 to 18 inches 
  are expected.

* WHERE...South Central Oregon Cascades above 4000 feet to include
  Highway 62 near Crater Lake, Crater Lake National Park, and
  Highway 230 near Diamond Lake. 

* WHEN...Until 4 AM Friday. 

* ADDITIONAL DETAILS...Prepare for slippery roads and reduced 
  visibilities at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

* Travel is strongly discouraged because of dangerous conditions.

* If you must travel, keep tire chains, a flashlight, blankets, 
  food, water, medications, and a fully charged phone with you.

* The safest place during a winter storm is indoors.

* A Winter Storm Warning means that severe winter weather is
  occurring and poses a threat to life and property. Take 
  protective action now.

&&

$$

CAZ085-171200-
/O.EXA.KMFR.WW.Y.0038.000000T0000Z-171117T1200Z/
Modoc County-
941 AM PST Thu Nov 16 2017

...WINTER WEATHER ADVISORY IN EFFECT UNTIL 4 AM PST FRIDAY...

* WHAT...Snow occurring. Plan on slippery road conditions.
  Additional snow accumulations of 3 to 6 inches, with localized
  amounts up to 14 inches in the highest terrain of the Warner
  Mountains, are expected.

* WHERE...Modoc County to include Cedar Pass on Highway 299.

* WHEN...Until 4 AM Friday. The heaviest snowfall rates will occur
  tonight. 

* ADDITIONAL DETAILS...Prepare for slippery roads and reduced 
  visibilities at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

* Slow down and allow extra time to reach your destination.

* Carry tire chains and be prepared for snow covered roads and 
  limited visibilities.

* See http://www.wrh.noaa.gov/mfr/cams for latest road 
  conditions.

* A Winter Weather Advisory for snow means that periods of snow 
  will cause travel difficulties.

&&

$$

ORZ029-030-171200-
/O.CON.KMFR.WW.Y.0038.000000T0000Z-171117T1200Z/
Klamath Basin-
Northern and Eastern Klamath County and Western Lake County-
Including the cities of Chemult, Crescent, and Gilchrist
941 AM PST Thu Nov 16 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 4 AM PST
FRIDAY...

* WHAT...Snow occurring. Plan on slippery road conditions.
  Additional snow accumulations of 2 to 4 inches, with localized 
  amounts up to 8 inches, are expected.

* WHERE...Klamath Basin and Northern and Eastern Klamath County
  and Western Lake County to include Highway 140 east of Bly.

* WHEN...Until 4 AM Friday. 

* ADDITIONAL DETAILS...Prepare for slippery roads and reduced 
  visibilities at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

* Slow down and allow extra time to reach your destination.

* Carry tire chains and be prepared for snow covered roads and 
  limited visibilities.

* See http://www.wrh.noaa.gov/mfr/cams for latest road 
  conditions.

* A Winter Weather Advisory for snow means that periods of snow 
  will cause travel difficulties.

&&

$$
290 
WWUS46 KMFR 161756
WSWMFR

URGENT - WINTER WEATHER MESSAGE
National Weather Service Medford OR
956 AM PST Thu Nov 16 2017

ORZ028-171200-
/O.CON.KMFR.WS.W.0017.000000T0000Z-171117T1200Z/
/O.CON.KMFR.WW.Y.0038.000000T0000Z-171117T1200Z/
Siskiyou Mountains and Southern Oregon Cascades-
Including the cities of Howard Prairie and Siskiyou Summit
956 AM PST Thu Nov 16 2017

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 AM PST FRIDAY
ABOVE 4000 FEET...
...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 4 AM PST
FRIDAY ABOVE 4000 FEET...

* WHAT...Moderate to heavy snow above 4000 feet expected. Travel 
  will be very difficult to impossible. In the Warning area, above
  4000 feet, additional snow accumulations of 8 to 14 inches are 
  expected. Above 4000 feet, in the advisory area, additional snow
  accumulations of 4 to 8 inches are expected.

* WHERE...Siskiyou Mountains and Southern Oregon Cascades. Winter
  Storm Warning for areas from Lake of the Woods northward to 
  include Highway 140 and Highway 62 above 4000 feet. Winter 
  Weather Advisory south of Lake of the Woods to include Highway 
  66 and Siskiyou Summit on I-5. 

* WHEN...Until 4 AM Friday. The heaviest snowfall rates will occur
  late this afternoon and early evening. 

* ADDITIONAL DETAILS...Look for snow covered roads and significant
  reductions in visibility at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

* Travel is strongly discouraged because of dangerous conditions.

* If you must travel, keep tire chains, a flashlight, blankets, 
  food, water, medications, and a fully charged phone with you.

* The safest place during a winter storm is indoors.

* A Winter Storm Warning means that severe winter weather is
  occurring and poses a threat to life and property. Take 
  protective action now.

* A Winter Weather Advisory for snow means that periods of snow 
  will cause travel difficulties.

&&

$$

CAZ080-171200-
/O.CON.KMFR.WS.W.0017.000000T0000Z-171117T1200Z/
Western Siskiyou County-
956 AM PST Thu Nov 16 2017

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 AM PST FRIDAY...

* WHAT...Heavy snow occurring. Plan on difficult travel 
  conditions, including during the evening commute. Additional 
  snow accumulations of up to 8 inches, with localized amounts 
  up to 14 inches, are expected.

* WHERE...Western Siskiyou County above 4000 feet to include Etna
  Summit on Sawyers Bar Road and Scott Mountain Pass on Highway 3.

* WHEN...Until 4 AM Friday.

* ADDITIONAL DETAILS...Prepare for slippery roads and reduced 
  visibilities at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

* Travel is strongly discouraged because of dangerous conditions.

* If you must travel, keep tire chains, a flashlight, blankets, 
  food, water, medications, and a fully charged phone with you.

* The safest place during a winter storm is indoors.

* A Winter Storm Warning means that severe winter weather is
  occurring and poses a threat to life and property. Take 
  protective action now.


&&

$$

ORZ027-171200-
/O.CON.KMFR.WS.W.0017.000000T0000Z-171117T1200Z/
South Central Oregon Cascades-
Including the cities of Crater Lake, Crescent Lake, 
and Diamond Lake
956 AM PST Thu Nov 16 2017

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 AM PST FRIDAY
ABOVE 4000 FEET...

* WHAT...Heavy snow occurring. Travel will be very difficult to 
  impossible. Additional snow accumulations of 10 to 18 inches 
  are expected.

* WHERE...South Central Oregon Cascades above 4000 feet to include
  Highway 62 near Crater Lake, Crater Lake National Park, and
  Highway 230 near Diamond Lake. 

* WHEN...Until 4 AM Friday. 

* ADDITIONAL DETAILS...Prepare for slippery roads and reduced 
  visibilities at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

* Travel is strongly discouraged because of dangerous conditions.

* If you must travel, keep tire chains, a flashlight, blankets, 
  food, water, medications, and a fully charged phone with you.

* The safest place during a winter storm is indoors.

* A Winter Storm Warning means that severe winter weather is
  occurring and poses a threat to life and property. Take
  protective action now.

&&

$$

ORZ031-171200-
/O.EXA.KMFR.WW.Y.0038.000000T0000Z-171117T1200Z/
Central and Eastern Lake County-
956 AM PST Thu Nov 16 2017

...WINTER WEATHER ADVISORY IN EFFECT UNTIL 4 AM PST FRIDAY...

* WHAT...Snow occurring. Additional snow accumulations of 3 to 6
  inches, with localized amounts up to 9 inches, are expected.

* WHERE...Central and Eastern Lake County to include Highway 140
  at Warner Mountain Summit.

* WHEN...Until 4 AM Friday. The heaviest snowfall rates will occur
  this evening and overnight.

* ADDITIONAL DETAILS...Be prepared for snow covered roads and 
  limited visibilities.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

* Slow down and allow extra time to reach your destination.

* Carry tire chains and be prepared for snow covered roads and 
  limited visibilities.

* See https://www.tripcheck.com for latest road conditions.

* A Winter Weather Advisory for snow means that periods of snow 
  will cause travel difficulties.

&&

$$

CAZ082-083-171200-
/O.CON.KMFR.WW.Y.0038.000000T0000Z-171117T1200Z/
South Central Siskiyou County-
North Central and Southeast Siskiyou County-
956 AM PST Thu Nov 16 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 4 AM PST
FRIDAY...

* WHAT...Snow expected. Plan on difficult travel conditions. Total
  snow accumulations of 4 to 8 inches with localized amounts of 12
  inches above 6500 feet.

* WHERE...Elevations above 5000 feet in North Central and
  Southeast Siskiyou County to include Everitt Memorial Highway.

* WHEN...10 AM to 4 AM Friday. 

* ADDITIONAL DETAILS...Prepare for slippery roads and reduced 
  visibilities at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

* Slow down and allow extra time to reach your destination.

* Carry tire chains and be prepared for snow covered roads and 
  limited visibilities.

* See http://www.wrh.noaa.gov/mfr/cams for latest road 
  conditions.

* A Winter Weather Advisory for snow means that periods of snow
  will cause travel difficulties.


&&

$$

CAZ085-171200-
/O.CON.KMFR.WW.Y.0038.000000T0000Z-171117T1200Z/
Modoc County-
956 AM PST Thu Nov 16 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 4 AM PST
FRIDAY...

* WHAT...Snow occurring. Plan on slippery road conditions.
  Additional snow accumulations of 3 to 6 inches, with localized
  amounts up to 14 inches in the highest terrain of the Warner
  Mountains, are expected.

* WHERE...Modoc County to include Cedar Pass on Highway 299.

* WHEN...Until 4 AM Friday. The heaviest snowfall rates will occur
  tonight. 

* ADDITIONAL DETAILS...Prepare for slippery roads and reduced 
  visibilities at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

* Slow down and allow extra time to reach your destination.

* Carry tire chains and be prepared for snow covered roads and 
  limited visibilities.

* See http://www.wrh.noaa.gov/mfr/cams for latest road 
  conditions.

* A Winter Weather Advisory for snow means that periods of snow 
  will cause travel difficulties.

&&

$$

ORZ029-030-171200-
/O.CON.KMFR.WW.Y.0038.000000T0000Z-171117T1200Z/
Klamath Basin-
Northern and Eastern Klamath County and Western Lake County-
Including the cities of Chemult, Crescent, and Gilchrist
956 AM PST Thu Nov 16 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 4 AM PST
FRIDAY...

* WHAT...Snow occurring. Plan on slippery road conditions.
  Additional snow accumulations of 2 to 4 inches, with localized 
  amounts up to 8 inches, are expected.

* WHERE...Klamath Basin and Northern and Eastern Klamath County
  and Western Lake County to include Highway 140 east of Bly.

* WHEN...Until 4 AM Friday. 

* ADDITIONAL DETAILS...Prepare for slippery roads and reduced 
  visibilities at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

* Slow down and allow extra time to reach your destination.

* Carry tire chains and be prepared for snow covered roads and 
  limited visibilities.

* See http://www.wrh.noaa.gov/mfr/cams for latest road 
  conditions.

* A Winter Weather Advisory for snow means that periods of snow 
  will cause travel difficulties.

&&

$$
008 
WWUS46 KMFR 162234
WSWMFR

URGENT - WINTER WEATHER MESSAGE
National Weather Service Medford OR
234 PM PST Thu Nov 16 2017

CAZ080-171200-
/O.CAN.KMFR.WS.W.0017.000000T0000Z-171117T1200Z/
/O.EXA.KMFR.WW.Y.0038.000000T0000Z-171117T1200Z/
Western Siskiyou County-
234 PM PST Thu Nov 16 2017

...WINTER WEATHER ADVISORY IN EFFECT UNTIL 4 AM PST FRIDAY...
...WINTER STORM WARNING IS CANCELLED...

* WHAT...Snow occurring. Additional snow accumulations of 3 to 6 
  inches, with localized amounts up to 9 inches, are expected.

* WHERE...Mountains of Western Siskiyou County to include Etna 
  Summit on Sawyers Bar Road.

* WHEN...Until 4 AM Friday. 

* ADDITIONAL DETAILS...Prepare for slippery roads and reduced 
  visibilities at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

* Slow down and allow extra time to reach your destination.

* Carry tire chains and be prepared for snow covered roads and 
  limited visibilities.

* See https://www.tripcheck.com for latest road conditions.

* A Winter Weather Advisory for snow means that periods of snow 
  will cause travel difficulties.

&&

$$

ORZ027-171500-
/O.EXB.KMFR.WW.Y.0038.000000T0000Z-171117T1500Z/
/O.EXT.KMFR.WS.W.0017.000000T0000Z-171117T1500Z/
South Central Oregon Cascades-
Including the cities of Crater Lake, Crescent Lake, Diamond Lake,
and Union Creek
234 PM PST Thu Nov 16 2017

...WINTER WEATHER ADVISORY IN EFFECT UNTIL 7 AM PST FRIDAY...
...WINTER STORM WARNING NOW IN EFFECT UNTIL 7 AM PST FRIDAY ABOVE
4000 FEET...

* WHAT...Moderate to heavy snow occurring. Additional snow 
  accumulations of 6 to 12 inches are expected in the Warning area
  tonight with 3 to 6 inches in the Advisory area.

* WHERE...Warning area includes South Central Oregon Cascades
  above 4000 feet to include Highway 62 near Crater Lake, Crater
  Lake National Park, and Highway 230 near Diamond Lake. Advisory
  area includes elevations between 3000 and 4000 feet to include
  Highway 62 at Union Creek. 

* WHEN...Until 4 AM Friday. For elevations below 5000 feet, snow
  is not expected to stick to the roads until after 6 PM this
  evening.

* ADDITIONAL DETAILS...Prepare for slippery roads and reduced 
  visibilities at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

* Travel is strongly discouraged because of dangerous conditions.

* If you must travel, keep tire chains, a flashlight, blankets, 
  food, water, medications, and a fully charged phone with you.

* The safest place during a winter storm is indoors.

* A Winter Storm Warning means that severe winter weather is
  occurring and poses a threat to life and property. Take
  protective action now.

* A Winter Weather Advisory for snow means that periods of snow 
  will cause travel difficulties.

&&

$$

ORZ028-171500-
/O.EXT.KMFR.WS.W.0017.000000T0000Z-171117T1500Z/
/O.EXT.KMFR.WW.Y.0038.000000T0000Z-171117T1500Z/
Siskiyou Mountains and Southern Oregon Cascades-
Including the cities of Howard Prairie and Siskiyou Summit
234 PM PST Thu Nov 16 2017

...WINTER STORM WARNING NOW IN EFFECT UNTIL 7 AM PST FRIDAY ABOVE
4000 FEET...
...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 7 AM PST FRIDAY...

* WHAT...Moderate to heavy snow occurring. Additional snowfall
  accumulations of 6 to 12 inches is expected in the Warning area
  with 3 to 6 inches in the Advisory area.

* WHERE...Siskiyou Mountains and Southern Oregon Cascades. Winter
  Storm Warning for areas from Lake of the Woods northward to
  include Highway 140 above 4000 feet. Winter Weather Advisory 
  south of Lake of the Woods to include Highway 66 and Siskiyou 
  Summit on I-5. 

* WHEN...Until 7 AM Friday. For elevations below 5000 feet, snow
  is not expected to stick to the roads until after 6 PM this
  evening.

* ADDITIONAL DETAILS...Prepare for slippery roads and reduced 
  visibilities at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

* Travel is strongly discouraged because of dangerous conditions.

* If you must travel, keep tire chains, a flashlight, blankets, 
  food, water, medications, and a fully charged phone with you.

* The safest place during a winter storm is indoors.

* A Winter Storm Warning means that severe winter weather is
  occurring and poses a threat to life and property. Take 
  protective action now.

* A Winter Weather Advisory for snow means that periods of snow 
  will cause travel difficulties.

&&

$$

ORZ025-026-171500-
/O.EXB.KMFR.WW.Y.0038.171117T0000Z-171117T1500Z/
Eastern Douglas County Foothills-Jackson County-
234 PM PST Thu Nov 16 2017

...WINTER WEATHER ADVISORY IN EFFECT UNTIL 7 AM PST FRIDAY ABOVE
3000 FEET...

* WHAT...Snow expected. Total snow accumulations of 3 to 6 inches.

* WHERE...Elevations above 3000 feet in Eastern Douglas County
  Foothills and Jackson County to include Highway 138 east of
  Toketee Falls.

* WHEN...4 PM to 7 AM Friday. 

* ADDITIONAL DETAILS...Prepare for slippery roads and reduced 
  visibilities at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

* Slow down and allow extra time to reach your destination.

* Carry tire chains and be prepared for snow covered roads and 
  limited visibilities.

* See https://www.tripcheck.com for latest road conditions.

* A Winter Weather Advisory for snow means that periods of snow 
  will cause travel difficulties.

&&

$$

CAZ085-171500-
/O.EXT.KMFR.WW.Y.0038.000000T0000Z-171117T1500Z/
Modoc County-
234 PM PST Thu Nov 16 2017

...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 7 AM PST FRIDAY...

* WHAT...Snow occurring. Additional snow accumulations of 2 to 4
  inches, with localized amounts up to 10 inches in the Warner 
  Mountains, are expected.

* WHERE...Portions of Modoc County to include Highway 299 at 
  Cedar Pass.

* WHEN...Until 7 AM Friday. The heaviest snowfall rates will occur
  between 10 PM this evening and 7 AM Friday.

* ADDITIONAL DETAILS...Prepare for slippery roads and reduced 
  visibilities at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

* Slow down and allow extra time to reach your destination.

* Carry tire chains and be prepared for snow covered roads and 
  limited visibilities.

* See http://www.wrh.noaa.gov/mfr/cams for latest road 
  conditions.

* A Winter Weather Advisory for snow means that periods of snow 
  will cause travel difficulties.

&&

$$

ORZ029>031-171500-
/O.EXT.KMFR.WW.Y.0038.000000T0000Z-171117T1500Z/
Klamath Basin-
Northern and Eastern Klamath County and Western Lake County-
Central and Eastern Lake County-
Including the cities of Chemult, Crescent, and Gilchrist
234 PM PST Thu Nov 16 2017

...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 7 AM PST FRIDAY...

* WHAT...Snow occurring. Additional snow accumulations of 2 to 4
  inches, with localized amounts up to 8 inches in the high
  mountains, are expected.

* WHERE...Higher elevations of Klamath and Lake Counties to 
  include Highway 97 mostly from Chiloquin northward...Highway 140
  at Quartz Mountain...Highway 140 on Warner Mountain Summit.

* WHEN...Until 7 AM Friday. 

* ADDITIONAL DETAILS...Be prepared for snow covered roads and 
  limited visibilities.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

* Slow down and allow extra time to reach your destination.

* Carry tire chains and be prepared for snow covered roads and 
  limited visibilities.

* See https://www.tripcheck.com for latest road conditions.

* A Winter Weather Advisory for snow means that periods of snow 
  will cause travel difficulties.

&&

$$

CAZ082-083-171200-
/O.CON.KMFR.WW.Y.0038.000000T0000Z-171117T1200Z/
South Central Siskiyou County-
North Central and Southeast Siskiyou County-
234 PM PST Thu Nov 16 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 4 AM PST
FRIDAY...

* WHAT...Snow occurring. Additional snow accumulations of 2 to 4
  inches, with localized amounts up to 8 inches, are expected.

* WHERE...Elevations above 5000 feet in North Central and
  Southeast Siskiyou County to include Everitt Memorial Highway.

* WHEN...Until 4 AM Friday. 

* ADDITIONAL DETAILS...Prepare for slippery roads and reduced 
  visibilities at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

* Slow down and allow extra time to reach your destination.

* Carry tire chains and be prepared for snow covered roads and 
  limited visibilities.

* See http://www.wrh.noaa.gov/mfr/cams for latest road 
  conditions.

* A Winter Weather Advisory for snow means that periods of snow
  will cause travel difficulties.

&&

$$
616 
WWUS46 KMFR 171141
WSWMFR

URGENT - WINTER WEATHER MESSAGE
National Weather Service Medford OR
341 AM PST Fri Nov 17 2017


CAZ082-083-171245-
/O.EXP.KMFR.WW.Y.0038.000000T0000Z-171117T1200Z/
South Central Siskiyou County-
North Central and Southeast Siskiyou County-
341 AM PST Fri Nov 17 2017

...WINTER WEATHER ADVISORY WILL EXPIRE AT 4 AM PST EARLY THIS
MORNING...

* Snow impacts are diminishing.

&&

$$

CAZ080-171245-
/O.EXP.KMFR.WW.Y.0038.000000T0000Z-171117T1200Z/
Western Siskiyou County-
341 AM PST Fri Nov 17 2017

...WINTER WEATHER ADVISORY WILL EXPIRE AT 4 AM PST EARLY THIS
MORNING...

* Snow impacts are diminishing.

&&

$$

ORZ027-028-171500-
/O.CON.KMFR.WS.W.0017.000000T0000Z-171117T1500Z/
/O.CON.KMFR.WW.Y.0038.000000T0000Z-171117T1500Z/
South Central Oregon Cascades-
Siskiyou Mountains and Southern Oregon Cascades-
Including the cities of Crater Lake, Crescent Lake, Diamond Lake,
Union Creek, Howard Prairie, and Siskiyou Summit
341 AM PST Fri Nov 17 2017

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 7 AM PST THIS
MORNING ABOVE 4000 FEET...
...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 7 AM PST THIS
MORNING...

* WHAT...Heavy snow occurring ABOVE 4000 FEET. Plan on difficult
  travel conditions. Additional snow accumulations of 2 to 5 
  inches are expected. 

* WHERE...South Central Oregon Cascades and Siskiyou Mountains 
  and Southern Oregon Cascades.

* WHEN...Until 7am.

* ADDITIONAL DETAILS...Look for significant reductions in 
  visibility at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

* Travel is strongly discouraged because of dangerous conditions.

* If you must travel, keep tire chains, a flashlight, blankets, 
  food, water, medications, and a fully charged phone with you.

* The safest place during a winter storm is indoors.

* A Winter Storm Warning means that severe winter weather is
  occurring, and poses a threat to life and property. Take 
  protective action now.

&&

$$

CAZ085-171500-
/O.CON.KMFR.WW.Y.0038.000000T0000Z-171117T1500Z/
Modoc County-
341 AM PST Fri Nov 17 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 7 AM PST THIS
MORNING...

* WHAT...Snow occurring. Plan on slippery road conditions. 
  Additional snow accumulations of 1 to 3 inches are expected.

* WHERE...Modoc County.

* WHEN...Until 7 AM.

* ADDITIONAL DETAILS...Look for reduced visibilities at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

* Slow down and allow extra time to reach your destination.

* Carry tire chains and be prepared for snow covered roads and 
  limited visibilities.

* See https://www.tripcheck.com for latest road conditions.

* A Winter Weather Advisory for snow means that periods of snow 
  will cause travel difficulties.

&&

$$

ORZ029>031-171500-
/O.CON.KMFR.WW.Y.0038.000000T0000Z-171117T1500Z/
Klamath Basin-
Northern and Eastern Klamath County and Western Lake County-
Central and Eastern Lake County-
Including the cities of Chemult, Crescent, and Gilchrist
341 AM PST Fri Nov 17 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 7 AM PST THIS
MORNING...

* WHAT...Snow occurring. Plan on slippery road conditions. 
  Additional snow accumulations of up to two inches are expected.

* WHERE...Klamath Basin, Northern and Eastern Klamath County and 
  Western Lake County and Central and Eastern Lake County.

* WHEN...Until 7 AM.

* ADDITIONAL DETAILS...Look for reduced visibilities at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

* Slow down and allow extra time to reach your destination.

* Carry tire chains and be prepared for snow covered roads and 
  limited visibilities.

* See https://www.tripcheck.com for latest road conditions.

* A Winter Weather Advisory for snow means that periods of snow 
  will cause travel difficulties.

&&

$$

ORZ025-026-171500-
/O.CON.KMFR.WW.Y.0038.000000T0000Z-171117T1500Z/
Eastern Douglas County Foothills-Jackson County-
341 AM PST Fri Nov 17 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 7 AM PST THIS
MORNING ABOVE 3000 FEET...

* WHAT...Snow occurring. Plan on slippery road conditions. 
  Additional snow accumulations of 1 to 3 inches are expected.

* WHERE...Eastern Douglas County Foothills and Jackson County.

* WHEN...Until 7 AM. 

* ADDITIONAL DETAILS...Look for reduced visibilities at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

* Slow down and allow extra time to reach your destination.

* Carry tire chains and be prepared for snow covered roads and 
  limited visibilities.

* See https://www.tripcheck.com for latest road conditions.

* A Winter Weather Advisory for snow means that periods of snow 
  will cause travel difficulties.

&&

$$
070 
WWUS46 KMFR 171434
WSWMFR

URGENT - WINTER WEATHER MESSAGE
National Weather Service Medford OR
634 AM PST Fri Nov 17 2017


ORZ027-028-171545-
/O.EXP.KMFR.WS.W.0017.000000T0000Z-171117T1500Z/
/O.EXP.KMFR.WW.Y.0038.000000T0000Z-171117T1500Z/
South Central Oregon Cascades-
Siskiyou Mountains and Southern Oregon Cascades-
Including the cities of Crater Lake, Crescent Lake, Diamond Lake,
Union Creek, Howard Prairie, and Siskiyou Summit
634 AM PST Fri Nov 17 2017

...WINTER STORM WARNING WILL EXPIRE AT 7 AM PST THIS MORNING
ABOVE 4000 FEET...
...WINTER WEATHER ADVISORY WILL EXPIRE AT 7 AM PST THIS MORNING...

* Snow impacts are diminishing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

&&

$$

CAZ085-171545-
/O.EXP.KMFR.WW.Y.0038.000000T0000Z-171117T1500Z/
Modoc County-
634 AM PST Fri Nov 17 2017

...WINTER WEATHER ADVISORY WILL EXPIRE AT 7 AM PST THIS MORNING...

* Snow impacts are diminishing.

&&

$$

ORZ029>031-171545-
/O.EXP.KMFR.WW.Y.0038.000000T0000Z-171117T1500Z/
Klamath Basin-
Northern and Eastern Klamath County and Western Lake County-
Central and Eastern Lake County-
Including the cities of Chemult, Crescent, and Gilchrist
634 AM PST Fri Nov 17 2017

...WINTER WEATHER ADVISORY WILL EXPIRE AT 7 AM PST THIS MORNING...

* Snow impacts are diminishing.

&&

$$

ORZ025-026-171545-
/O.EXP.KMFR.WW.Y.0038.000000T0000Z-171117T1500Z/
Eastern Douglas County Foothills-Jackson County-
634 AM PST Fri Nov 17 2017

...WINTER WEATHER ADVISORY WILL EXPIRE AT 7 AM PST THIS MORNING
ABOVE 3000 FEET...

* Snow impacts are diminishing.

&&

$$

What forecasters said that day

The local office's own words before this winter storm 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 winter storm warning went out at Nov 15, 8:22 PM PST, 1 hour 52 minutes earlier.

Area forecast discussion, Nov 15, 8:22 PM PST, 1 hour 52 minutes before
Area Forecast Discussion
National Weather Service Medford OR
822 PM PST Wed Nov 15 2017

.DISCUSSION...16/00Z NAM in. 16/00Z GFS in through 168hr.

Currently a long wave trough is offshore along 130W with strong
southwest flow aloft over the Pacific Northwest. Short waves
ejected by this trough are supporting surface fronts, and one of
those fronts is now moving through the Medford CWA. Waves have
formed on this front, and that is slowing its progress.

There is plenty of precipitation over the area with a snow level
of 5500 to 6000 feet. There won't be enough rain to worry about
flooding, but snow at the upper elevations will be significant and
Winter Storm Warnings and Winter Weather Advisories are in effect.

The snow level will drop to 3500 feet Thursday morning but by
then the steady precipitation will have ended. Numerous showers
will affect all of southern Oregon and northern California
Thursday afternoon through Friday morning as more ejected short
waves move through.

The trough will move onshore Thursday night into Friday. Even
then, one last short wave moving down the backside of the trough
will support shower activity into Friday.

Once that last wave moves through Friday morning, the air mass
will stabilize and dry out as a long wave ridge edges onshore.
This will provide a break in the action Friday night into
Saturday.

Saturday morning will be very cold due to clearing skies combined
with a cold air mass. Low temperatures will be in the upper 20s
to lower 30s west of the cascades and in the teens east of the
Cascades.

The ridge will break to the east Saturday, and southwest flow
aloft will return to the area Saturday night into Sunday, opening
the storm door. Cloud cover will increase as the next upstream
trough approaches the coast.

Long Term Discussion from the Wednesday afternoon AFD..Sunday
night through Wednesday. Overall, we'll maintain an unsettled
weather pattern early-mid next week, but disturbances after Monday
will have sub- tropical origins, so we'll likely have above
normal temperatures and increasing snow levels.

After much agreement between the 12z models through Sunday, guidance
tends to diverge a bit early next week with respect to another
strong upper trough and associated frontal system moving onshore
into the PacNW Sunday night through Monday. The 12z ECMWF moves this
system through the area quickly, such that precipitation would be
all but over by Monday afternoon. But, the 12z GFS forms a wave
along the front and brings another round of precipitation through
Monday night into Tuesday. While the GFS has been going back and
forth on its solutions during this time frame, the ECMWF has been
steady in its depictions. It is also notable that the GEFS/EC
ensembles are more closely aligned with the 12z ECMWF. Therefore, we
have weighted the forecast more heavily in favor the 12z ECMWF with
a brief short wave ridge building in and most areas drying out
late Monday/Monday night into Tuesday. Despite the lower confidence
in timing details, this frontal system should bring a pretty good
shot of precipitation to the area Sunday night into Monday morning.
Snow levels will be typical of a mid-November system lowering to
near 5000 feet.

After a brief short wave ridge, another system will develop
over the Pacific and move toward the area Tuesday. Since its
origin will be the sub-tropics, expect a surge in snow level at
some point Tuesday into Wednesday to near or perhaps even briefly
above 9000 feet. Confidence is lower on timing and strength of
this system, but it should bring more wet weather at mid week.
-Spilde

&&

.AVIATION...16/00Z TAF CYCLE...A potent cold front is now east of
the Cascades where it is continuing to bring widespread rain and
snow, MVFR, mountain obscuration, and gusty southerly low level
winds. The front will exit the area early Thursday morning. A weaker
disturbance is trailing behind with mainly VFR cigs but also local
MVFR and IFR accompanying rain and snow showers with areas of
mountain obscuration. Mainly light showers and snow showers will
continue across the area Thursday into Thursday night, especially
near and along west facing slopes. Freezing levels near 6500 ft msl
will fall to 4500 ft msl Thursday afternoon. -DW

&&

.MARINE...Updated 800 PM PST Wednesday 15 November 2017...Winds
have diminished behind a cold front. But, seas will remain steep and
hazardous to small craft through Thursday afternoon. Seas will be
dominated by westerly swell at 11 seconds, but combine with south
wind waves and a fresh south swell at 7 to 8 seconds through
Thursday afternoon. High pressure will then take control over the
coastal waters Friday, and conditions will be relatively calm with
diminishing seas through Saturday. Gusty south winds and steep seas
are possible with the next front on Sunday. -DW

&&

.MFR WATCHES/WARNINGS/ADVISORIES...
OR...High Wind Warning until 1 AM PST Thursday for ORZ030-031.
     Wind Advisory until 1 AM PST Thursday for ORZ029>031.
     Winter Storm Warning until 10 PM PST this evening above 5500
        feet in the for ORZ027.
     Winter Storm Warning until 10 PM PST this evening above 5500
        feet in the for ORZ028.

CA...High Wind Warning until 1 AM PST Thursday for CAZ085.
     Wind Advisory until 1 AM PST Thursday for CAZ084-085.
     Winter Storm Warning until 10 PM PST this evening above 4000
        feet in the for CAZ082.
     Winter Storm Warning until 10 PM PST this evening above 5500
        feet in the for CAZ080.
     Wind Advisory until 10 PM PST this evening for CAZ081.
     Winter Weather Advisory until 1 AM PST Thursday for CAZ083.
     Winter Storm Warning until 10 PM PST this evening for CAZ083.

Pacific Coastal Waters...Small Craft Advisory for hazardous seas
        until 4 PM PST Thursday for PZZ350-356-370-376.

15/15/16

In the hours before

Local storm report, Nov 15, 8:05 PM PST, 2 hours 9 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MEDFORD OR
805 PM PST WED NOV 15 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0804 PM     HEAVY RAIN       7 ESE COOS BAY          43.35N 124.09W
11/15/2017  M1.31 INCH       COOS               OR   TRAINED SPOTTER

            ENDING AT 2000 PST.

&&

JRS

Nearby

Winter Storm Warnings in Oregon, 2017Winter Storm Warnings in California, 2017Every winter storm warning in 2017

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.