Alert archive / California / Winter Storm Warnings in 2021

Winter Storm Warning 7, NWS Eureka, CA

December 12, 2021Del Norte County, Humboldt County, Trinity County, California

NWS Eureka, CA issued this winter storm warning at Dec 12, 2021, 5:17 AM PST for Del Norte County, Humboldt County, Trinity County, California. It took effect at Dec 12, 2021, 10:00 PM PST. It was in force for 24 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
Dec 12, 2021, 5:17 AM PST (13:17 UTC)
In effect from
Dec 12, 2021, 10:00 PM PST
Expired
Dec 13, 2021, 10:00 PM PST
In force
24 hr
Issued by
NWS Eureka, CA

Counties Del Norte County, CA, Humboldt County, CA, Trinity County, CA

The radar

The Eureka (Bunker Hill) radar (KBHX), 80 km from the middle of the area, began a volume at 13:20 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, 1.3 hours before the alert went out and 165 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 2021-12-12Temperature 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°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Medford/Jackson, OR at 12:00Z on 2021-12-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 101 square meters per square second.1939587897117136156Sfc1 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
673 m above ground
0-6 km bulk shear
93 kt
0-1 km storm-relative helicity
101 m²/s²
0-3 km storm-relative helicity
216 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

675 
WWUS46 KEKA 121317
WSWEKA

URGENT - WINTER WEATHER MESSAGE
National Weather Service Eureka CA
517 AM PST Sun Dec 12 2021

...PERIODS OF HEAVY MOUNTAIN SNOW LATE TONIGHT THROUGH MONDAY,
WITH LOWERING SNOW LEVELS...

In between storm systems, lighter showery precipitation will
linger today with snow levels tending to rise into the 3000 to
4000 ft range later this morning through tonight. Snow levels
should be above 3500 feet across most of our area Monday morning.
Steadier precipitation will move in tonight ahead of another cold
front, resulting in heavy mountain snow along the highest portions
of highway 36 and highway 3. 

As the cold front moves through from midday through Monday 
afternoon, snow levels will lower while some heavy precipitation 
lingers. Snow levels will drop below 2500 feet in the afternoon 
across Humboldt County, even reaching 2000 feet Monday evening 
across most of northwest California. That will allow for heavy 
snow around Berry Summit. Fortunately precipitation become lighter
and more showery Monday evening, with lighter accumulations on 
the passes farther east along the Highway 299 corridor. Some minor
accumulations of a coating to locally as much as 2 inches will be
possible at low elevations through Tuesday morning as snow levels
lower near or even below 1000 feet. 


CAZ107-108-122130-
/O.CAN.KEKA.WS.W.0006.000000T0000Z-211212T1400Z/
/O.UPG.KEKA.WS.A.0006.211213T0600Z-211214T1200Z/
/O.NEW.KEKA.WS.W.0007.211213T0600Z-211214T0600Z/
Northern Trinity-Southern Trinity-
517 AM PST Sun Dec 12 2021

...WINTER STORM WARNING IN EFFECT FROM 10 PM THIS EVENING TO
10 PM PST MONDAY ABOVE 3500 FEET...

* WHAT...Heavy snow expected above 3500 feet. Total snow
  accumulations of 5 to 10 inches along high elevation portions of
  Highway 3 and 36, with another 12 to 18 inches at Scott Mountain
  Summit. 

* WHERE...Northern Trinity and Southern Trinity Counties.

* WHEN...From 10 PM this evening to 10 PM PST Monday.

* IMPACTS...Travel could be very difficult to impossible along
  high elevation portions of Highways 3 and 36, with slippery,
  snow-covered roads and poor visibility. 


PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state of California can be
obtained by calling 1-800-GAS-ROAD.

&&

$$

CAZ105-106-122130-
/O.UPG.KEKA.WS.A.0006.211213T0600Z-211214T1200Z/
/O.NEW.KEKA.WS.W.0007.211213T1800Z-211214T0600Z/
Northern Humboldt Interior-Southern Humboldt Interior-
517 AM PST Sun Dec 12 2021

...WINTER STORM WARNING IN EFFECT FROM 10 AM TO 10 PM PST MONDAY
ABOVE 2500 FEET...

* WHAT...Heavy snow expected above 2500 feet. Total snow
  accumulations of 5 to 9 inches at Berry Summit on Highway 299,
  with higher amounts possible on other rural travel corridors 
  above 3000 feet.

* WHERE...Northern Humboldt Interior and Southern Humboldt 
  Interior Counties.

* WHEN...From 10 AM to 10 PM PST Monday.

* IMPACTS...Travel could be very difficult along Highway 299 near
  Berry Summit, with slippery, snow-covered road conditions and
  poor visibility. Some high elevation rural roadways may become
  impassable. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state of California can be
obtained by calling 1-800-GAS-ROAD.

&&

$$
9 follow-up statements
624 
WWUS46 KEKA 122136
WSWEKA

URGENT - WINTER WEATHER MESSAGE
National Weather Service Eureka CA
136 PM PST Sun Dec 12 2021

...PERIODS OF HEAVY MOUNTAIN SNOW LATE TONIGHT THROUGH MONDAY,
WITH LOWERING SNOW LEVELS...

Light rain and snow showers continue across the area this
afternoon with snow levels around 3,500 to 4,000 feet. Snow 
levels should be above 3500 feet in the north and above 4,500 feet
in the south. Steadier precipitation will move in tonight ahead 
of another cold front, resulting in heavy mountain snow along the 
highest portions of highway 36 and highway 3.

As the cold front moves through on Monday, snow levels will lower
while some heavy precipitation lingers. Snow levels will drop 
below 2500 feet in the afternoon across Humboldt County, even 
reaching 2000 feet Monday evening across most of northwest 
California. That will allow for heavy snow around Berry Summit. 
Monday night snow levels will continue to fall as snow showers
diminish. Some minor accumulations will be possible at elevations
as low as 1,000 feet by Tuesday morning.

CAZ102-130545-
/O.EXA.KEKA.WS.W.0007.211213T1800Z-211214T0600Z/
Del Norte Interior-
136 PM PST Sun Dec 12 2021

...WINTER STORM WARNING IN EFFECT FROM 10 AM TO 10 PM PST MONDAY
ABOVE 2500 FEET...

* WHAT...Heavy snow expected above 2500 feet. Total snow
  accumulations of 5 to 10 inches.

* WHERE...Del Norte Interior County.

* WHEN...From 10 AM to 10 PM PST Monday.

* IMPACTS...Travel could be very difficult to impossible. The 
  hazardous conditions could impact the evening commute.

* ADDITIONAL DETAILS...Up to 2 inches is possible down to 2,000
  feet Monday evening and overnight. This may impact Hwy 199 at 
  the Collier Tunnel.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state of California can be
obtained by calling 1-800-GAS-ROAD.

&&

$$

CAZ105-106-130545-
/O.CON.KEKA.WS.W.0007.211213T1800Z-211214T0600Z/
Northern Humboldt Interior-Southern Humboldt Interior-
136 PM PST Sun Dec 12 2021

...WINTER STORM WARNING REMAINS IN EFFECT FROM 10 AM TO 10 PM PST
MONDAY ABOVE 2500 FEET...

* WHAT...Heavy snow expected above 2500 feet. Total snow
  accumulations of 3 to 8 inches.

* WHERE...Northern Humboldt Interior and Southern Humboldt 
  Interior Counties.

* WHEN...From 10 AM to 10 PM PST Monday.

* IMPACTS...Travel could be very difficult to impossible. The 
  hazardous conditions could impact the evening commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state of California can be
obtained by calling 1-800-GAS-ROAD.

&&

$$

CAZ107-108-130545-
/O.CON.KEKA.WS.W.0007.211213T0600Z-211214T0600Z/
Northern Trinity-Southern Trinity-
136 PM PST Sun Dec 12 2021

...WINTER STORM WARNING REMAINS IN EFFECT FROM 10 PM THIS EVENING
TO 10 PM PST MONDAY ABOVE 3500 FEET...

* WHAT...Heavy snow expected above 3500 feet. Total snow
  accumulations of 6 to 12 inches. Local amounts to 2 feet at
  Scott Mountain Pass.

* WHERE...Southern Trinity and Northern Trinity Counties.

* WHEN...From 10 PM this evening to 10 PM PST Monday.

* IMPACTS...Travel could be very difficult to impossible. The 
  hazardous conditions could impact the morning or evening 
  commute.

* ADDITIONAL DETAILS...Up to 2 inches is possible down to 2,000
  feet Monday evening and overnight. This would impact the summits
  on Highway 299 and Highway 3.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state of California can be
obtained by calling 1-800-GAS-ROAD.

&&

$$
057 
WWUS46 KEKA 130127
WSWEKA

URGENT - WINTER WEATHER MESSAGE
National Weather Service Eureka CA
527 PM PST Sun Dec 12 2021

...PERIODS OF HEAVY MOUNTAIN SNOW LATE TONIGHT THROUGH MONDAY
NIGHT...

Light rain and snow showers continue across the area this
afternoon with snow levels around 3,500 to 4,000 feet. Snow
levels should be above 3500 feet in the north and above
4,500 feet in the south. Steadier precipitation will move in
tonight ahead of another cold front, resulting in heavy mountain
snow along the highest portions of highway 36 and highway 3 in
Trinity County.

As the cold front moves through on Monday, snow levels will lower.
Snow levels will drop below 2000 feet in the afternoon across 
Humboldt and Del Norte County. That will allow for heavy snow 
around Berry Summit and Collier Tunnel. Monday night snow levels 
will continue to fall as snow showers diminish. Some minor 
accumulations will be possible at elevations as low as 1,000 feet 
by Tuesday morning.

CAZ102-105-106-130930-
/O.CON.KEKA.WS.W.0007.211213T1800Z-211214T0600Z/
Del Norte Interior-Northern Humboldt Interior-
Southern Humboldt Interior-
527 PM PST Sun Dec 12 2021

...WINTER STORM WARNING REMAINS IN EFFECT FROM 10 AM TO 10 PM PST
MONDAY ABOVE 1500 FEET...

* WHAT...Heavy snow expected above 1500 feet. Total snow
  accumulations of 5 to 12 inches.

* WHERE...Del Norte Interior, Northern Humboldt Interior and 
  Southern Humboldt Interior Counties.

* WHEN...From 10 AM to 10 PM PST Monday.

* IMPACTS...Travel could be very difficult to impossible. The
  hazardous conditions could impact the evening commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state of California can be
obtained by calling 1-800-GAS-ROAD.

&&

$$

CAZ107-108-130930-
/O.CON.KEKA.WS.W.0007.211213T0600Z-211214T0600Z/
Northern Trinity-Southern Trinity-
527 PM PST Sun Dec 12 2021

...WINTER STORM WARNING REMAINS IN EFFECT FROM 10 PM THIS EVENING
TO 10 PM PST MONDAY ABOVE 3000 FEET...

* WHAT...Heavy snow expected above 3000 feet. Total snow 
  accumulations of 5 to 24 inches.

* WHERE...Southern Trinity and Northern Trinity Counties.

* WHEN...From 10 PM this evening to 10 PM PST Monday.

* IMPACTS...Travel could be very difficult to impossible. The
  hazardous conditions could impact the morning or evening
  commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state of California can be
obtained by calling 1-800-GAS-ROAD.

&&

$$

CAZ110-111-113>115-130930-
/O.NEW.KEKA.WW.Y.0020.211214T0000Z-211214T1200Z/
Northwestern Mendocino Interior-Northeastern Mendocino Interior-
Southeastern Mendocino Interior-Northern Lake-Southern Lake-
527 PM PST Sun Dec 12 2021

...WINTER WEATHER ADVISORY IN EFFECT FROM 4 PM MONDAY TO 4 AM PST
TUESDAY...

* WHAT...Snow expected. Total snow accumulations of 1 to 4 
  inches.

* WHERE...Northwestern Mendocino Interior, Northeastern 
  Mendocino Interior, Southeastern Mendocino Interior, Northern 
  Lake and Southern Lake Counties.

* WHEN...From 4 PM Monday to 4 AM PST Tuesday.

* IMPACTS...Travel could be very difficult. The hazardous
  conditions could impact the evening commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions for the state of California can be
obtained by calling 1-800-GAS-ROAD.

&&

$$
937 
WWUS46 KEKA 130603
WSWEKA

URGENT - WINTER WEATHER MESSAGE
National Weather Service Eureka CA
1003 PM PST Sun Dec 12 2021

...PERIODS OF HEAVY MOUNTAIN SNOW TONIGHT THROUGH MONDAY NIGHT...

Steady precipitation will spread inland tonight ahead of another 
cold front, resulting in heavy mountain snow along the highest 
portions of highway 36 and highway 3 in Trinity County. Snow 
levels will lower during Monday below 2000 feet in the afternoon 
across Humboldt and Del Norte County. That will allow for heavy 
snow around Berry Summit and Collier Tunnel. Monday night snow 
levels will continue to fall as snow showers diminish. Some minor 
accumulations will be possible at elevations as low as 1,000 feet 
by Tuesday morning across Mendocino and Lake Counties.

CAZ102-105-106-131415-
/O.CON.KEKA.WS.W.0007.211213T1800Z-211214T0600Z/
Del Norte Interior-Northern Humboldt Interior-
Southern Humboldt Interior-
1003 PM PST Sun Dec 12 2021

...WINTER STORM WARNING REMAINS IN EFFECT FROM 10 AM TO 10 PM PST
MONDAY ABOVE 1500 FEET...

* WHAT...Heavy snow expected above 1500 feet. Total snow
  accumulations of 5 to 12 inches.

* WHERE...Del Norte Interior, Northern Humboldt Interior and 
  Southern Humboldt Interior Counties.

* WHEN...From 10 AM to 10 PM PST Monday.

* IMPACTS...Travel could be very difficult to impossible. The 
  hazardous conditions could impact the evening commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state of California can be
obtained by calling 1-800-GAS-ROAD.

&&

$$

CAZ107-108-131415-
/O.CON.KEKA.WS.W.0007.000000T0000Z-211214T0600Z/
Northern Trinity-Southern Trinity-
1003 PM PST Sun Dec 12 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 PM PST MONDAY
ABOVE 3000 FEET...

* WHAT...Heavy snow above 3000 feet. Additional snow 
  accumulations of 5 to 24 inches.

* WHERE...Southern Trinity and Northern Trinity Counties.

* WHEN...Until 10 PM PST Monday.

* IMPACTS...Travel could be very difficult to impossible. The 
  hazardous conditions could impact the morning or evening 
  commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state of California can be
obtained by calling 1-800-GAS-ROAD.

&&

$$

CAZ110-111-113>115-131415-
/O.CON.KEKA.WW.Y.0020.211214T0000Z-211214T1200Z/
Northwestern Mendocino Interior-Northeastern Mendocino Interior-
Southeastern Mendocino Interior-Northern Lake-Southern Lake-
1003 PM PST Sun Dec 12 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 4 PM MONDAY TO
4 AM PST TUESDAY...

* WHAT...Snow expected. Total snow accumulations of 1 to 4 
  inches.

* WHERE...Northeastern Mendocino Interior, Southeastern 
  Mendocino Interior, Northwestern Mendocino Interior, Northern 
  Lake and Southern Lake Counties.

* WHEN...From 4 PM Monday to 4 AM PST Tuesday.

* IMPACTS...Travel could be very difficult. The hazardous 
  conditions could impact the evening commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions for the state of California can be
obtained by calling 1-800-GAS-ROAD.

&&

$$
532 
WWUS46 KEKA 131208
WSWEKA

URGENT - WINTER WEATHER MESSAGE
National Weather Service Eureka CA
408 AM PST Mon Dec 13 2021

...PERIODS OF HEAVY MOUNTAIN SNOW TONIGHT THROUGH MONDAY NIGHT...

Precipitation will become steadier and heavier this morning ahead
of a cold front, resulting in heavy mountain snow along the 
highest portions of highway 36 and highway 3 in Trinity County. 
Snow levels will begin lowering by mid-morning, eventually dropping
below 2000 feet in Humboldt and Del Norte Counties later this  
afternoon. That will allow for heavy snow around Berry Summit and
near the Collier Tunnel. Precipitation coverage and intensity 
will diminish greatly heading into this evening. However, some 
scattered showers will linger through the night into early Tuesday
morning, as snow levels will continue to fall. Some minor 
accumulations will be possible at elevations as low as 1,000 feet 
by Tuesday morning, with some accumulations possible at some of 
the highway summits through Mendocino and Lake County. 


CAZ102-105-106-132015-
/O.CON.KEKA.WS.W.0007.211213T1800Z-211214T0600Z/
Del Norte Interior-Northern Humboldt Interior-
Southern Humboldt Interior-
408 AM PST Mon Dec 13 2021

...WINTER STORM WARNING REMAINS IN EFFECT FROM 10 AM THIS MORNING
TO 10 PM PST THIS EVENING ABOVE 1500 FEET...

* WHAT...Heavy snow expected above 1500 feet. Total snow
  accumulations of 6 to 12 inches possible at Berry Summit and the
  Collier Tunnel.

* WHERE...Del Norte Interior, Northern Humboldt Interior and 
  Southern Humboldt Interior Counties.

* WHEN...From 10 AM this morning to 10 PM PST this evening.

* IMPACTS...Travel could be very difficult along Highway 299 near
  Berry Summit and on Highway 199 at the Collier Tunnel, with 
  slippery, snow- covered road conditions and poor visibility. 
  Some high elevation rural roadways may become impassable. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state of California can be
obtained by calling 1-800-GAS-ROAD.

&&

$$

CAZ107-108-132015-
/O.CON.KEKA.WS.W.0007.000000T0000Z-211214T0600Z/
Northern Trinity-Southern Trinity-
408 AM PST Mon Dec 13 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 PM PST THIS
EVENING ABOVE 3000 FEET...

* WHAT...Heavy snow above 3000 feet. Additional snow accumulations
  of 6 to 12 inches possible along the higher elevation portions
  of Highway 3 and 36, with 14 to 20 inches at Scott Mountain
  Summit. Winds gusting as high as 35 mph.

* WHERE...Southern Trinity and Northern Trinity Counties.

* WHEN...Until 10 PM PST this evening.

* IMPACTS...Travel could be very difficult to impossible along
  high elevation portions of Highways 3 and 36, with slippery,
  snow-covered roads and poor visibility. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state of California can be
obtained by calling 1-800-GAS-ROAD.

&&

$$

CAZ110-111-113>115-132015-
/O.EXT.KEKA.WW.Y.0020.211214T0000Z-211214T1400Z/
Northwestern Mendocino Interior-Northeastern Mendocino Interior-
Southeastern Mendocino Interior-Northern Lake-Southern Lake-
408 AM PST Mon Dec 13 2021

...WINTER WEATHER ADVISORY NOW IN EFFECT FROM 4 PM THIS AFTERNOON
TO 6 AM PST TUESDAY ABOVE 1500 FEET...

* WHAT...Snow expected above 1500 feet. Total snow accumulations
  of 1 to 4 inches. Some minor accumulations possible down to 1000
  feet. 

* WHERE...Northeastern Mendocino Interior, Southeastern 
  Mendocino Interior, Northwestern Mendocino Interior, Northern 
  Lake and Southern Lake Counties.

* WHEN...From 4 PM this afternoon to 6 AM PST Tuesday.

* IMPACTS...Travel could be difficult tonight into early Tuesday
  morning, with slippery, snow- covered roads possible at the 
  higher elevation summits of Highway 101, and portions of Highway
  20 and 175. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions for the state of California can be
obtained by calling 1-800-GAS-ROAD.

&&

$$
367 
WWUS46 KEKA 131210 CCA
WSWEKA

URGENT - WINTER WEATHER MESSAGE...CORRECTED
National Weather Service Eureka CA
410 AM PST Mon Dec 13 2021

...PERIODS OF HEAVY MOUNTAIN SNOW THROUGH THIS AFTERNOON, WITH
LOW SNOW SNOW LEVELS AND LINGERING SNOW SHOWERS TONIGHT...

Precipitation will become steadier and heavier this morning ahead
of a cold front, resulting in heavy mountain snow along the 
highest portions of highway 36 and highway 3 in Trinity County. 
Snow levels will begin lowering by mid-morning, eventually dropping
below 2000 feet in Humboldt and Del Norte Counties later this  
afternoon. That will allow for heavy snow around Berry Summit and
near the Collier Tunnel. Precipitation coverage and intensity 
will diminish greatly heading into this evening. However, some 
scattered showers will linger through the night into early Tuesday
morning, as snow levels will continue to fall. Some minor 
accumulations will be possible at elevations as low as 1,000 feet 
by Tuesday morning, with some accumulations possible at some of 
the highway summits through Mendocino and Lake County. 


CAZ102-105-106-132015-
/O.CON.KEKA.WS.W.0007.211213T1800Z-211214T0600Z/
Del Norte Interior-Northern Humboldt Interior-
Southern Humboldt Interior-
410 AM PST Mon Dec 13 2021

...WINTER STORM WARNING REMAINS IN EFFECT FROM 10 AM THIS MORNING
TO 10 PM PST THIS EVENING ABOVE 1500 FEET...

* WHAT...Heavy snow expected above 1500 feet. Total snow
  accumulations of 6 to 12 inches possible at Berry Summit and the
  Collier Tunnel.

* WHERE...Del Norte Interior, Northern Humboldt Interior and 
  Southern Humboldt Interior Counties.

* WHEN...From 10 AM this morning to 10 PM PST this evening.

* IMPACTS...Travel could be very difficult along Highway 299 near
  Berry Summit and on Highway 199 at the Collier Tunnel, with 
  slippery, snow- covered road conditions and poor visibility. 
  Some high elevation rural roadways may become impassable. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state of California can be
obtained by calling 1-800-GAS-ROAD.

&&

$$

CAZ107-108-132015-
/O.CON.KEKA.WS.W.0007.000000T0000Z-211214T0600Z/
Northern Trinity-Southern Trinity-
410 AM PST Mon Dec 13 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 PM PST THIS
EVENING ABOVE 3000 FEET...

* WHAT...Heavy snow above 3000 feet. Additional snow accumulations
  of 6 to 12 inches possible along the higher elevation portions
  of Highway 3 and 36, with 14 to 20 inches at Scott Mountain
  Summit. Winds gusting as high as 35 mph.

* WHERE...Southern Trinity and Northern Trinity Counties.

* WHEN...Until 10 PM PST this evening.

* IMPACTS...Travel could be very difficult to impossible along
  high elevation portions of Highways 3 and 36, with slippery,
  snow-covered roads and poor visibility. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state of California can be
obtained by calling 1-800-GAS-ROAD.

&&

$$

CAZ110-111-113>115-132015-
/O.EXT.KEKA.WW.Y.0020.211214T0000Z-211214T1400Z/
Northwestern Mendocino Interior-Northeastern Mendocino Interior-
Southeastern Mendocino Interior-Northern Lake-Southern Lake-
410 AM PST Mon Dec 13 2021

...WINTER WEATHER ADVISORY NOW IN EFFECT FROM 4 PM THIS AFTERNOON
TO 6 AM PST TUESDAY ABOVE 1500 FEET...

* WHAT...Snow expected above 1500 feet. Total snow accumulations
  of 1 to 4 inches. Some minor accumulations possible down to 1000
  feet. 

* WHERE...Northeastern Mendocino Interior, Southeastern 
  Mendocino Interior, Northwestern Mendocino Interior, Northern 
  Lake and Southern Lake Counties.

* WHEN...From 4 PM this afternoon to 6 AM PST Tuesday.

* IMPACTS...Travel could be difficult tonight into early Tuesday
  morning, with slippery, snow- covered roads possible at the 
  higher elevation summits of Highway 101, and portions of Highway
  20 and 175. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions for the state of California can be
obtained by calling 1-800-GAS-ROAD.

&&

$$
003 
WWUS46 KEKA 131703
WSWEKA

URGENT - WINTER WEATHER MESSAGE
National Weather Service Eureka CA
903 AM PST Mon Dec 13 2021

...PERIODS OF HEAVY MOUNTAIN SNOW THROUGH THIS AFTERNOON, WITH
LOW SNOW SNOW LEVELS AND LINGERING SNOW SHOWERS TONIGHT...

Precipitation will become steadier and heavier this morning ahead
of a cold front, resulting in heavy mountain snow along the
highest portions of highway 36 and highway 3 in Trinity County.
Snow levels will begin lowering by mid-morning, eventually
dropping below 2000 feet in Humboldt and Del Norte Counties this
afternoon. That will allow for heavy snow around Berry Summit and
near the Collier Tunnel. Precipitation coverage and intensity 
will diminish greatly heading into this evening. However, some 
scattered showers will linger through the night into early Tuesday
morning, as snow levels will continue to fall. Some minor 
accumulations will be possible at elevations as low as 1,000 feet 
by Tuesday morning, which includes the highway summits through 
Mendocino and Lake County.

CAZ102-105-106-140115-
/O.CON.KEKA.WS.W.0007.211213T1800Z-211214T0600Z/
Del Norte Interior-Northern Humboldt Interior-
Southern Humboldt Interior-
903 AM PST Mon Dec 13 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 PM PST THIS
EVENING ABOVE 1500 FEET...

* WHAT...Heavy snow expected above 1500 feet. Total snow 
  accumulations of 6 to 12 inches possible at Berry Summit and 
  the Collier Tunnel.

* WHERE...Del Norte Interior, Northern Humboldt Interior and 
  Southern Humboldt Interior Counties.

* WHEN...From 10 AM this morning to 10 PM PST this evening.

* IMPACTS...Travel could be very difficult along Highway 299 
  near Berry Summit and on Highway 199 at the Collier Tunnel, 
  with slippery, snow- covered road conditions and poor 
  visibility. Some high elevation rural roadways may become 
  impassable. 

* ADDITIONAL DETAILS...Snow levels will fall through the day to
  around 1500 feet by late afternoon or evening.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state of California can be
obtained by calling 1-800-GAS-ROAD.

&&

$$

CAZ107-108-140115-
/O.CON.KEKA.WS.W.0007.000000T0000Z-211214T0600Z/
Northern Trinity-Southern Trinity-
903 AM PST Mon Dec 13 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 PM PST THIS
EVENING ABOVE 3000 FEET...

* WHAT...Heavy snow above 3000 feet. Additional snow 
  accumulations of 6 to 12 inches possible along the higher 
  elevation portions of Highway 3 and 36, with 14 to 20 inches 
  at Scott Mountain Summit. Winds gusting as high as 35 mph.

* WHERE...Southern Trinity and Northern Trinity Counties.

* WHEN...Until 10 PM PST this evening.

* IMPACTS...Travel could be very difficult to impossible along 
  high elevation portions of Highways 3 and 36, with slippery, 
  snow- covered roads and poor visibility.

* ADDITIONAL DETAILS...Snow levels will fall through the day to
  around 1500 feet by evening.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state of California can be
obtained by calling 1-800-GAS-ROAD.

&&

$$

CAZ110-111-113>115-140115-
/O.CON.KEKA.WW.Y.0020.211214T0000Z-211214T1400Z/
Northwestern Mendocino Interior-Northeastern Mendocino Interior-
Southeastern Mendocino Interior-Northern Lake-Southern Lake-
903 AM PST Mon Dec 13 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 4 PM THIS
AFTERNOON TO 6 AM PST TUESDAY ABOVE 1500 FEET...

* WHAT...Snow expected above 1500 feet. Total snow accumulations 
  of 1 to 4 inches. Some minor accumulations possible down to 
  1000 feet.

* WHERE...Northeastern Mendocino Interior, Southeastern 
  Mendocino Interior, Northwestern Mendocino Interior, Northern 
  Lake and Southern Lake Counties.

* WHEN...From 4 PM this afternoon to 6 AM PST Tuesday.

* IMPACTS...Travel could be difficult tonight into early Tuesday 
  morning, with slippery, snow- covered roads possible at the 
  higher elevation summits of Highway 101, and portions of 
  Highway 20 and 175.

* ADDITIONAL DETAILS...Snow levels will fall through the afternoon
  and overnight as the rain becomes more showery and tapers off.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions for the state of California can be
obtained by calling 1-800-GAS-ROAD.

&&

$$
507 
WWUS46 KEKA 132225
WSWEKA

URGENT - WINTER WEATHER MESSAGE
National Weather Service Eureka CA
225 PM PST Mon Dec 13 2021

...LOW SNOW SNOW LEVELS AND LINGERING SNOW SHOWERS TONIGHT...

...Heavy low elevation snow expected on Wednesday...

Snow levels will continue to drop to around 1000 feet by late
tonight. Snow showers will taper off through evening and
overnight. Some minor accumulations will be possible at 
elevations as low as 1,000 feet by Tuesday morning, which includes
the highway summits through Mendocino and Lake County.

Another storm system is expected to bring snow as low 1,500 to
2,000 feet on Wednesday. This is expected to bring significant 
snow to most highway passes across the area. 

CAZ102-105-106-140630-
/O.NEW.KEKA.WS.A.0007.211215T1200Z-211216T0200Z/
/O.CON.KEKA.WS.W.0007.000000T0000Z-211214T0600Z/
Del Norte Interior-Northern Humboldt Interior-
Southern Humboldt Interior-
225 PM PST Mon Dec 13 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 PM PST THIS
EVENING ABOVE 1500 FEET...
...WINTER STORM WATCH IN EFFECT FROM LATE TUESDAY NIGHT THROUGH
WEDNESDAY AFTERNOON ABOVE 2000 FEET...

* WHAT...For the Winter Storm Warning above 1500 feet, heavy 
  snow. Additional snow accumulations of up to 6 inches. For the 
  Winter Storm Watch above 2000 feet, heavy snow possible. Total 
  snow accumulations of 6 to 12 inches possible. Winds could 
  gust as high as 35 mph.

* WHERE...Del Norte Interior, Northern Humboldt Interior and 
  Southern Humboldt Interior Counties.

* WHEN...For the Winter Storm Warning, until 10 PM PST this 
  evening. For the Winter Storm Watch, from late Tuesday night 
  through Wednesday afternoon.

* IMPACTS...Travel could be very difficult to impossible. The 
  hazardous conditions could impact the morning or evening 
  commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

Monitor the latest forecasts for updates on this situation. 

The latest road conditions for the state of California can be
obtained by calling 1-800-GAS-ROAD.

&&

$$

CAZ108-140630-
/O.NEW.KEKA.WS.A.0007.211215T1200Z-211216T1000Z/
/O.CON.KEKA.WS.W.0007.000000T0000Z-211214T0600Z/
Southern Trinity-
225 PM PST Mon Dec 13 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 PM PST THIS
EVENING ABOVE 3000 FEET...
...WINTER STORM WATCH IN EFFECT FROM LATE TUESDAY NIGHT THROUGH
LATE WEDNESDAY NIGHT ABOVE 2000 FEET...

* WHAT...For the Winter Storm Warning above 3000 feet, heavy 
  snow. Additional snow accumulations of 2 to 6 inches. For the 
  Winter Storm Watch above 2000 feet, heavy snow possible. Total 
  snow accumulations of 6 to 15 inches possible. Winds could 
  gust as high as 35 mph.

* WHERE...Southern Trinity County.

* WHEN...For the Winter Storm Warning, until 10 PM PST this 
  evening. For the Winter Storm Watch, from late Tuesday night 
  through late Wednesday night.

* IMPACTS...Travel could be very difficult to impossible. The 
  hazardous conditions could impact the morning or evening 
  commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

Monitor the latest forecasts for updates on this situation. 

The latest road conditions for the state of California can be
obtained by calling 1-800-GAS-ROAD.

&&

$$

CAZ107-140630-
/O.NEW.KEKA.WS.A.0007.211215T1200Z-211216T1000Z/
/O.CON.KEKA.WS.W.0007.000000T0000Z-211214T0600Z/
Northern Trinity-
225 PM PST Mon Dec 13 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 PM PST THIS
EVENING ABOVE 3000 FEET...
...WINTER STORM WATCH IN EFFECT FROM LATE TUESDAY NIGHT THROUGH
LATE WEDNESDAY NIGHT ABOVE 1500 FEET...

* WHAT...For the Winter Storm Warning above 3000 feet, heavy snow.
  Additional snow accumulations of 2 to 5 inches. Winds gusting as
  high as 35 mph. For the Winter Storm Watch above 1500 feet,
  heavy snow possible. Total snow accumulations of 7 to 14 inches
  possible.

* WHERE...Northern Trinity County. 

* WHEN...For the Winter Storm Warning, until 10 PM PST this 
  evening. For the Winter Storm Watch, from late Tuesday night 
  through late Wednesday night.

* IMPACTS...Travel could be very difficult to impossible. The 
  hazardous conditions could impact the morning or evening 
  commute.

* ADDITIONAL DETAILS...Significant snow is possible in Weaverville
  on Wednesday. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

Monitor the latest forecasts for updates on this situation. 

The latest road conditions for the state of California can be
obtained by calling 1-800-GAS-ROAD.

&&

$$

CAZ110-111-114-140630-
/O.NEW.KEKA.WS.A.0007.211215T1200Z-211216T0200Z/
/O.CON.KEKA.WW.Y.0020.211214T0000Z-211214T1400Z/
Northwestern Mendocino Interior-Northeastern Mendocino Interior-
Northern Lake-
225 PM PST Mon Dec 13 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 AM PST
TUESDAY ABOVE 1500 FEET...
...WINTER STORM WATCH IN EFFECT FROM LATE TUESDAY NIGHT THROUGH
WEDNESDAY AFTERNOON ABOVE 2000 FEET...

* WHAT...For the Winter Weather Advisory above 1500 feet, snow 
  expected. Total snow accumulations of up to 4 inches. For the 
  Winter Storm Watch above 2000 feet, heavy snow possible. Total 
  snow accumulations of 2 to 11 inches possible.

* WHERE...Northwestern Mendocino Interior, Northeastern 
  Mendocino Interior and Northern Lake Counties.

* WHEN...For the Winter Weather Advisory, until 6 AM PST 
  Tuesday. For the Winter Storm Watch, from late Tuesday night 
  through Wednesday afternoon.

* IMPACTS...Travel could be very difficult to impossible. The 
  hazardous conditions could impact the morning or evening 
  commute.

* ADDITIONAL DETAILS...Snow may impact the higher summits on Hwy
  101 in Mendocino county on Wednesday.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

Monitor the latest forecasts for updates on this situation. 

The latest road conditions for the state of California can be
obtained by calling 1-800-GAS-ROAD.

&&

$$

CAZ113-115-140630-
/O.CON.KEKA.WW.Y.0020.211214T0000Z-211214T1400Z/
Southeastern Mendocino Interior-Southern Lake-
225 PM PST Mon Dec 13 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 AM PST
TUESDAY ABOVE 1500 FEET...

* WHAT...Snow expected above 1500 feet. Total snow accumulations 
  of up to two inches.

* WHERE...Southeastern Mendocino Interior and Southern Lake 
  Counties.

* WHEN...Until 6 AM PST Tuesday.

* IMPACTS...Plan on slippery road conditions. The hazardous 
  conditions could impact the evening commute.

* ADDITIONAL DETAILS...Snow levels will gradually fall tonight to
  around 1000 feet.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions for the state of California can be
obtained by calling 1-800-GAS-ROAD.

&&

$$
938 
WWUS46 KEKA 140436
WSWEKA

URGENT - WINTER WEATHER MESSAGE
National Weather Service Eureka CA
836 PM PST Mon Dec 13 2021

...WINTER WEATHER WILL CONTINUE THROUGH WEDNESDAY...

Snow levels will continue to drop to around 1000 feet by late
tonight. However, snow showers will taper off during the evening 
and overnight hours. Some minor accumulations will be possible at
elevations as low as 1,000 feet by Tuesday morning, which 
includes the highway summits through Mendocino and Lake County.
Otherwise, another storm system will produce moderate to heavy
snow accumulations for elevations as low 1500 to 2000 feet on 
Wednesday.

CAZ102-105-106-141245-
/O.CON.KEKA.WS.W.0007.000000T0000Z-211214T0600Z/
/O.CON.KEKA.WS.A.0007.211215T1200Z-211216T0200Z/
Del Norte Interior-Northern Humboldt Interior-
Southern Humboldt Interior-
836 PM PST Mon Dec 13 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 PM PST THIS
EVENING ABOVE 1500 FEET...
...WINTER STORM WATCH REMAINS IN EFFECT FROM LATE TUESDAY NIGHT
THROUGH WEDNESDAY AFTERNOON ABOVE 2000 FEET...

* WHAT...For the Winter Storm Warning above 1500 feet, additional
  snow accumulations of up to one inch. For the Winter Storm 
  Watch above 2000 feet, heavy snow possible. Total snow 
  accumulations of 5 to 12 inches possible. Winds could gust as 
  high as 50 mph.

* WHERE...Del Norte Interior, Northern Humboldt Interior and 
  Southern Humboldt Interior Counties.

* WHEN...For the Winter Storm Warning, until 10 PM PST this 
  evening. For the Winter Storm Watch, from late Tuesday night 
  through Wednesday afternoon.

* IMPACTS...Travel could be very difficult to impossible. The 
  hazardous conditions could impact the morning or evening 
  commute. Gusty winds could bring down tree branches.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

Monitor the latest forecasts for updates on this situation. 

The latest road conditions for the state of California can be
obtained by calling 1-800-GAS-ROAD.

&&

$$

CAZ108-141245-
/O.CON.KEKA.WS.W.0007.000000T0000Z-211214T0600Z/
/O.CON.KEKA.WS.A.0007.211215T1200Z-211216T1000Z/
Southern Trinity-
836 PM PST Mon Dec 13 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 PM PST THIS
EVENING ABOVE 3000 FEET...
...WINTER STORM WATCH REMAINS IN EFFECT FROM LATE TUESDAY NIGHT
THROUGH LATE WEDNESDAY NIGHT ABOVE 2000 FEET...

* WHAT...For the Winter Storm Warning above 3000 feet, additional
  snow accumulations of up to one inch. For the Winter Storm 
  Watch above 2000 feet, heavy snow possible. Total snow 
  accumulations of 6 to 15 inches possible. Winds could gust as 
  high as 40 mph.

* WHERE...Southern Trinity County.

* WHEN...For the Winter Storm Warning, until 10 PM PST this 
  evening. For the Winter Storm Watch, from late Tuesday night 
  through late Wednesday night.

* IMPACTS...Travel could be very difficult to impossible. The 
  hazardous conditions could impact the morning or evening 
  commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

Monitor the latest forecasts for updates on this situation. 

The latest road conditions for the state of California can be
obtained by calling 1-800-GAS-ROAD.

&&

$$

CAZ107-141245-
/O.CON.KEKA.WS.W.0007.000000T0000Z-211214T0600Z/
/O.CON.KEKA.WS.A.0007.211215T1200Z-211216T1000Z/
Northern Trinity-
836 PM PST Mon Dec 13 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 PM PST THIS
EVENING ABOVE 3000 FEET...
...WINTER STORM WATCH REMAINS IN EFFECT FROM LATE TUESDAY NIGHT
THROUGH LATE WEDNESDAY NIGHT ABOVE 1500 FEET...

* WHAT...For the Winter Storm Warning above 3000 feet, additional
  snow accumulations of up to one inch. For the Winter Storm 
  Watch above 1500 feet, heavy snow possible. Total snow 
  accumulations of 7 to 21 inches possible. Winds could gust as 
  high as 45 mph.

* WHERE...Northern Trinity County.

* WHEN...For the Winter Storm Warning, until 10 PM PST this 
  evening. For the Winter Storm Watch, from late Tuesday night 
  through late Wednesday night.

* IMPACTS...Travel could be very difficult to impossible. The
  hazardous conditions could impact the morning or evening
  commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

Monitor the latest forecasts for updates on this situation. 

The latest road conditions for the state of California can be
obtained by calling 1-800-GAS-ROAD.

&&

$$

CAZ110-111-114-141245-
/O.CON.KEKA.WW.Y.0020.000000T0000Z-211214T1400Z/
/O.CON.KEKA.WS.A.0007.211215T1200Z-211216T0200Z/
Northwestern Mendocino Interior-Northeastern Mendocino Interior-
Northern Lake-
836 PM PST Mon Dec 13 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 AM PST
TUESDAY ABOVE 1500 FEET...
...WINTER STORM WATCH REMAINS IN EFFECT FROM LATE TUESDAY NIGHT
THROUGH WEDNESDAY AFTERNOON ABOVE 2000 FEET...

* WHAT...For the Winter Weather Advisory above 1500 feet,
  additional snow accumulations of up to 1 inch. For the Winter 
  Storm Watch above 2000 feet, heavy snow possible. Total snow 
  accumulations of 5 to 10 inches possible. Winds could gust as 
  high as 40 mph.

* WHERE...Northeastern Mendocino Interior, Northwestern 
  Mendocino Interior and Northern Lake Counties.

* WHEN...For the Winter Weather Advisory, until 6 AM PST 
  Tuesday. For the Winter Storm Watch, from late Tuesday night 
  through Wednesday afternoon.

* IMPACTS...Travel could be very difficult to impossible. The
  hazardous conditions could impact the morning or evening
  commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

Monitor the latest forecasts for updates on this situation. 

The latest road conditions for the state of California can be
obtained by calling 1-800-GAS-ROAD.

&&

$$

CAZ113-115-141245-
/O.CON.KEKA.WW.Y.0020.000000T0000Z-211214T1400Z/
Southeastern Mendocino Interior-Southern Lake-
836 PM PST Mon Dec 13 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 AM PST
TUESDAY ABOVE 1500 FEET...

* WHAT...Snow above 1500 feet. Additional snow accumulations of 
  up to one inch.

* WHERE...Southeastern Mendocino Interior and Southern Lake 
  Counties.

* WHEN...Until 6 AM PST Tuesday.

* IMPACTS...Plan on slippery road conditions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions for the state of California can be
obtained by calling 1-800-GAS-ROAD.

&&

$$
186 
WWUS46 KEKA 140538
WSWEKA

URGENT - WINTER WEATHER MESSAGE
National Weather Service Eureka CA
938 PM PST Mon Dec 13 2021

...WINTER WEATHER WILL CONTINUE THROUGH WEDNESDAY...

Snow levels will continue to drop to around 1000 feet by late
tonight. However, snow showers will taper off during the evening
and overnight hours. Some minor accumulations will be possible at
elevations as low as 1,000 feet by Tuesday morning, which
includes the highway summits through Mendocino and Lake County.
Otherwise, another storm system will produce moderate to heavy
snow accumulations for elevations as low 1500 to 2000 feet on
Wednesday.

CAZ102-105-106-141345-
/O.EXP.KEKA.WS.W.0007.000000T0000Z-211214T0600Z/
/O.CON.KEKA.WS.A.0007.211215T1200Z-211216T0200Z/
Del Norte Interior-Northern Humboldt Interior-
Southern Humboldt Interior-
938 PM PST Mon Dec 13 2021

...WINTER STORM WATCH REMAINS IN EFFECT FROM LATE TUESDAY NIGHT
THROUGH WEDNESDAY AFTERNOON ABOVE 2000 FEET...

* WHAT...Heavy snow possible above 2000 feet. Total snow 
  accumulations of 5 to 12 inches possible. Winds could gust as 
  high as 50 mph.

* WHERE...Del Norte Interior, Northern Humboldt Interior and 
  Southern Humboldt Interior Counties.

* WHEN...From late Tuesday night through Wednesday afternoon.

* IMPACTS...Travel could be very difficult to impossible. The 
  hazardous conditions could impact the morning or evening 
  commute. Gusty winds could bring down tree branches.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation. 

&&

$$

CAZ108-141345-
/O.EXP.KEKA.WS.W.0007.000000T0000Z-211214T0600Z/
/O.CON.KEKA.WS.A.0007.211215T1200Z-211216T1000Z/
Southern Trinity-
938 PM PST Mon Dec 13 2021

...WINTER STORM WATCH REMAINS IN EFFECT FROM LATE TUESDAY NIGHT
THROUGH LATE WEDNESDAY NIGHT ABOVE 2000 FEET...

* WHAT...Heavy snow possible above 2000 feet. Total snow 
  accumulations of 6 to 15 inches possible. Winds could gust as 
  high as 45 mph.

* WHERE...Southern Trinity County.

* WHEN...From late Tuesday night through late Wednesday night.

* IMPACTS...Travel could be very difficult to impossible. The 
  hazardous conditions could impact the morning or evening 
  commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation. 

&&

$$

CAZ107-141345-
/O.EXP.KEKA.WS.W.0007.000000T0000Z-211214T0600Z/
/O.CON.KEKA.WS.A.0007.211215T1200Z-211216T1000Z/
Northern Trinity-
938 PM PST Mon Dec 13 2021

...WINTER STORM WATCH REMAINS IN EFFECT FROM LATE TUESDAY NIGHT
THROUGH LATE WEDNESDAY NIGHT ABOVE 1500 FEET...

* WHAT...Heavy snow possible above 1500 feet. Total snow 
  accumulations of 7 to 21 inches possible. Winds could gust as 
  high as 45 mph.

* WHERE...Northern Trinity County.

* WHEN...From late Tuesday night through late Wednesday night.

* IMPACTS...Travel could be very difficult to impossible. The 
  hazardous conditions could impact the morning or evening 
  commute. Gusty winds could bring down tree branches.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation. 

&&

$$

CAZ110-111-114-141345-
/O.EXT.KEKA.WW.Y.0020.000000T0000Z-211214T1200Z/
/O.CON.KEKA.WS.A.0007.211215T1200Z-211216T0200Z/
Northwestern Mendocino Interior-Northeastern Mendocino Interior-
Northern Lake-
938 PM PST Mon Dec 13 2021

...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 4 AM PST TUESDAY
ABOVE 1500 FEET...
...WINTER STORM WATCH REMAINS IN EFFECT FROM LATE TUESDAY NIGHT
THROUGH WEDNESDAY AFTERNOON ABOVE 2000 FEET...

* WHAT...For the Winter Weather Advisory above 1500 feet, snow. 
  Additional snow accumulations of up to two inches. For the 
  Winter Storm Watch above 2000 feet, heavy snow possible. Total 
  snow accumulations of 5 to 10 inches possible. Winds could 
  gust as high as 45 mph.

* WHERE...Northeastern Mendocino Interior, Northwestern 
  Mendocino Interior and Northern Lake Counties.

* WHEN...For the Winter Weather Advisory, until 4 AM PST 
  Tuesday. For the Winter Storm Watch, from late Tuesday night 
  through Wednesday afternoon.

* IMPACTS...Travel could be very difficult to impossible. The 
  hazardous conditions could impact the morning or evening 
  commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

Monitor the latest forecasts for updates on this situation. 

The latest road conditions for the state of California can be
obtained by calling 1-800-GAS-ROAD.

&&

$$

CAZ113-115-141200-
/O.EXT.KEKA.WW.Y.0020.000000T0000Z-211214T1200Z/
Southeastern Mendocino Interior-Southern Lake-
938 PM PST Mon Dec 13 2021

...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 4 AM PST TUESDAY
ABOVE 1500 FEET...

* WHAT...Snow above 1500 feet. Additional snow accumulations of 
  up to one inch.

* WHERE...Southeastern Mendocino Interior and Southern Lake 
  Counties.

* WHEN...Until 4 AM PST Tuesday.

* IMPACTS...Plan on slippery road conditions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions for the state of California can be
obtained by calling 1-800-GAS-ROAD.

&&

$$

The office that day

Everything else NWS Eureka, CA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Dec 11, 10:05 PM PSTGale WarningEKA55 min
Dec 11, 10:53 PM PSTWind AdvisoryEKAHumboldt2 hr
Dec 12, 12:51 AM PSTHazardous Seas WarningEKA8 hr
Dec 12, 9:09 AM PSTSmall Craft AdvisoryEKA70 hr
Dec 12, 3:49 PM PSTGale WarningEKA10 hr
Dec 12, 3:49 PM PSTSmall Craft AdvisoryEKA5 hr

Nearby

Winter Storm Warnings in California, 2021Every winter storm warning 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.