Winter Storm Warning 12, NWS Sacramento, CA

507 
WWUS46 KSTO 282158
WSWSTO

URGENT - WINTER WEATHER MESSAGE
National Weather Service Sacramento CA
158 PM PST Tue Dec 28 2021

...Winter Weather to Impact Mountain and Foothill Travel into
Wednesday...

.Light snow showers continue into this evening before moderate to
heavy snow returns tonight into Wednesday. Snow levels continue to
be low, possibly down to the Valley floor in the Northern
Sacramento Valley.

Check road conditions before traveling. Some roads may remain
closed or impassable.

CAZ068-291300-
/O.CON.KSTO.WS.W.0012.000000T0000Z-211229T2000Z/
Western Plumas County/Lassen Park-
158 PM PST Tue Dec 28 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL NOON PST
WEDNESDAY...

* WHAT...Light snow showers continue into the evening with periods
  of heavy snow returning tonight into Wednesday. Plan on
  difficult travel conditions. Additional snow accumulations of 3
  to 5 inches, with localized amounts up to 10 inches, are 
  expected.

* WHERE...Western Plumas County/Lassen Park.

* WHEN...Until noon Wednesday.

* ADDITIONAL DETAILS...Be prepared for significant reductions in
  visibility at times. Check road conditions before traveling. 
  Many roads may remain closed or impassable.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow means there will be snow covered
roads and limited visibilities. Travel is not recommended while
the warning is in effect. 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 you are
calling from can be obtained by calling 5 1 1.

$$

CAZ066-291300-
/O.CON.KSTO.WS.W.0012.000000T0000Z-211229T2000Z/
Northeast Foothills/Sacramento Valley-
Including the city of Paradise
158 PM PST Tue Dec 28 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL NOON PST
WEDNESDAY ABOVE 1000 FEET...

* WHAT...Light snow showers continue into the evening with periods
  of heavy snow returning tonight into Wednesday. Plan on 
  difficult travel conditions. Additional snow accumulations of 2 
  to 4 inches, with localized amounts up to 8 inches, are 
  expected.

* WHERE...Northeast Foothills/Sacramento Valley.

* WHEN...Until noon Wednesday.

* ADDITIONAL DETAILS...Be prepared for significant reductions in
  visibility at times. Check road conditions before traveling. 
  Many roads may remain closed or impassable.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow means there will be snow covered
roads and limited visibilities. Travel is not recommended while
the warning is in effect. 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 you are
calling from can be obtained by calling 5 1 1.

$$

CAZ067-291300-
/O.CON.KSTO.WS.W.0012.000000T0000Z-211230T0000Z/
Motherlode-
Including the city of Grass Valley
158 PM PST Tue Dec 28 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 PM PST
WEDNESDAY ABOVE 2000 FEET...

* WHAT...Light snow showers continue into the evening with periods
  of heavy snow returning tonight into Wednesday. Plan on
  difficult travel conditions. Additional snow accumulations of 3
  to 5 inches, with localized amounts up to 10 inches, are 
  expected.

* WHERE...Motherlode.

* WHEN...Until 4 PM Wednesday.

* ADDITIONAL DETAILS...Be prepared for significant reductions in 
  visibility at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow means there will be snow covered
roads and limited visibilities. Travel is not recommended while
the warning is in effect. 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 you are
calling from can be obtained by calling 5 1 1.

$$

CAZ069-291300-
/O.CON.KSTO.WS.W.0012.000000T0000Z-211230T0600Z/
West Slope Northern Sierra Nevada-
158 PM PST Tue Dec 28 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 PM PST
WEDNESDAY ABOVE 2000 FEET...

* WHAT...Light snow showers continue into the evening with periods of
  heavy snow returning tonight into Wednesday. Plan on difficult 
  travel conditions. Additional snow accumulations of 9 to 14 
  inches, with localized amounts up to 2 feet, are expected.

* WHERE...West Slope Northern Sierra Nevada.

* WHEN...Until 10 PM Wednesday.

* ADDITIONAL DETAILS...Be prepared for significant reductions in 
  visibility at times. Check road conditions before traveling. 
  Many roads may remain closed or impassable. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow means there will be snow covered
roads and limited visibilities. Travel is not recommended while
the warning is in effect. 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 you are
calling from can be obtained by calling 5 1 1.

$$

CAZ015-291300-
/O.CON.KSTO.WW.Y.0025.000000T0000Z-211229T2000Z/
Northern Sacramento Valley-
Including the city of Redding
158 PM PST Tue Dec 28 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON PST
WEDNESDAY...

* WHAT...Wet snow, or a mix of rain and snow is expected at times
  on the Valley floor. Minor accumulations are possible on grassy
  areas. However, 1 to 2 inches of snow may accumulate over the 
  higher terrain surrounding the Valley floor. 

* WHERE...Northern Sacramento Valley.

* WHEN...Until noon Wednesday.

* ADDITIONAL DETAILS...Be prepared for reduced visibilities at 
  times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Be prepared for snow covered
roads and limited visibilities, and use caution while driving.
The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

$$

CAZ013-063-291300-
/O.CON.KSTO.WW.Y.0025.000000T0000Z-211229T2000Z/
Shasta Lake Area / Northern Shasta County-
Mountains Southwestern Shasta County to Western Colusa County-
Including the city of Shasta Dam
158 PM PST Tue Dec 28 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON PST
WEDNESDAY ABOVE 1000 FEET...

* WHAT...Light snow showers continue into the evening with periods
  of moderate snow returning tonight into Wednesday. Additional
  snow accumulations of 2 to 4 inches, with localized amounts up
  to 6 inches, are expected. Accumulating snow is expected on
  Interstate 5 north of Redding at times. 

* WHERE...Shasta Lake Area / Northern Shasta County and 
  Mountains Southwestern Shasta County to Western Colusa County.

* WHEN...Until noon Wednesday.

* ADDITIONAL DETAILS...Be prepared for reduced visibilities at
  times, and snow covered and slippery roads. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Be prepared for snow covered
roads and limited visibilities, and use caution while driving.
The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

$$

190 
WWUS46 KSTO 290940
WSWSTO

URGENT - WINTER WEATHER MESSAGE
National Weather Service Sacramento CA
140 AM PST Wed Dec 29 2021

...Winter Weather to Impact Mountain and Foothill Travel into
Wednesday...

.Moderate to locally heavy snow today. Snow levels continue to be
low between 1000 and 2500 feet today. 

Check road conditions before traveling. Some roads may remain
closed or impassable.

CAZ015-291045-
/O.CAN.KSTO.WW.Y.0025.000000T0000Z-211229T2000Z/
Northern Sacramento Valley-
140 AM PST Wed Dec 29 2021

...WINTER WEATHER ADVISORY IS CANCELLED...

Snow level is expected to be around 1000 feet this morning. Only a
light mixture of rain and snow may be possible for some areas
near 1000 feet with no snow accumulation expected therefore the
Winter Weather Advisory has been cancelled.

$$

CAZ068-292000-
/O.CON.KSTO.WS.W.0012.000000T0000Z-211229T2000Z/
Western Plumas County/Lassen Park-
140 AM PST Wed Dec 29 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL NOON PST TODAY...

* WHAT...Snow occurring. Plan on difficult travel conditions, 
  including during the morning commute. Additional snow 
  accumulations of 2 to 4 inches, with localized amounts up to 7 
  inches, are expected.

* WHERE...Western Plumas County/Lassen Park.

* WHEN...Until noon today.

* ADDITIONAL DETAILS...Be prepared for significant reductions in 
  visibility at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow means there will be snow covered
roads and limited visibilities. Travel is not recommended while
the warning is in effect. 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 you are
calling from can be obtained by calling 5 1 1.

$$

CAZ066-292000-
/O.CON.KSTO.WS.W.0012.000000T0000Z-211229T2000Z/
Northeast Foothills/Sacramento Valley-
Including the city of Paradise
140 AM PST Wed Dec 29 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL NOON PST TODAY
ABOVE 1500 FEET...

* WHAT...Snow occurring. Plan on difficult travel conditions, 
  including during the morning commute. Additional wet snow 
  accumulations of 1 to 3 inches, with localized amounts up to 5 
  inches, are expected.

* WHERE...Northeast Foothills/Sacramento Valley.

* WHEN...Until noon today.

* ADDITIONAL DETAILS...Be prepared for significant reductions in 
  visibility at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for wet snow means there will be snow
covered roads and limited visibilities. Travel is not recommended
while the warning is in effect. 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 you are
calling from can be obtained by calling 5 1 1.

$$

CAZ067-300000-
/O.CON.KSTO.WS.W.0012.000000T0000Z-211230T0000Z/
Motherlode-
Including the city of Grass Valley
140 AM PST Wed Dec 29 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 PM PST THIS
AFTERNOON ABOVE 2000 FEET...

* WHAT...Snow occurring. Plan on difficult travel conditions, 
  including during the morning commute. Additional snow 
  accumulations of 1 to 3 inches, with localized amounts up to 8 
  inches, are expected.

* WHERE...Motherlode.

* WHEN...Until 4 PM today.

* ADDITIONAL DETAILS...Be prepared for significant reductions in 
  visibility at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow means there will be snow covered
roads and limited visibilities. Travel is not recommended while
the warning is in effect. 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 you are
calling from can be obtained by calling 5 1 1.

$$

CAZ069-300000-
/O.CON.KSTO.WS.W.0012.000000T0000Z-211230T0600Z/
West Slope Northern Sierra Nevada-
140 AM PST Wed Dec 29 2021

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

* WHAT...Snow occurring. Plan on difficult travel conditions, 
  including during the morning commute. Additional snow 
  accumulations of 6 to 9 inches, with localized amounts up to 16 
  inches, are expected.

* WHERE...West Slope Northern Sierra Nevada.

* WHEN...Until 10 PM today.

* ADDITIONAL DETAILS...Be prepared for significant reductions in 
  visibility at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow means there will be snow covered
roads and limited visibilities. Travel is not recommended while
the warning is in effect. 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 you are
calling from can be obtained by calling 5 1 1.

$$

CAZ013-063-292000-
/O.CON.KSTO.WW.Y.0025.000000T0000Z-211229T2000Z/
Shasta Lake Area / Northern Shasta County-
Mountains Southwestern Shasta County to Western Colusa County-
Including the city of Shasta Dam
140 AM PST Wed Dec 29 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON PST TODAY
ABOVE 1000 FEET...

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

* WHERE...Shasta Lake Area / Northern Shasta County and 
  Mountains Southwestern Shasta County to Western Colusa County.

* WHEN...Until noon today.

* ADDITIONAL DETAILS...Be prepared for reduced visibilities at 
  times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Be prepared for snow covered
roads and limited visibilities, and use caution while driving.
The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

$$

376 
WWUS46 KSTO 291342
WSWSTO

URGENT - WINTER WEATHER MESSAGE
National Weather Service Sacramento CA
542 AM PST Wed Dec 29 2021

...Winter Weather to Impact Mountain and Foothill Travel into
Wednesday...

.Moderate to locally heavy snow today. Snow levels continue to be
low between 1000 and 2000 feet today.

Check road conditions before traveling. Some roads may remain
closed or impassable.

CAZ068-292000-
/O.CON.KSTO.WS.W.0012.000000T0000Z-211229T2000Z/
Western Plumas County/Lassen Park-
542 AM PST Wed Dec 29 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL NOON PST TODAY...

* WHAT...Heavy snow occurring. Plan on difficult travel 
  conditions, including during the morning commute. Additional 
  snow accumulations of up to 2 inches, with localized amounts 
  up to 4 inches, are expected.

* WHERE...Western Plumas County/Lassen Park.

* WHEN...Until noon today.

* ADDITIONAL DETAILS...Be prepared for significant reductions in 
  visibility at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow means there will be snow covered
roads and limited visibilities. Travel is not recommended while
the warning is in effect. 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 you are
calling from can be obtained by calling 5 1 1.

$$

CAZ066-292000-
/O.CON.KSTO.WS.W.0012.000000T0000Z-211229T2000Z/
Northeast Foothills/Sacramento Valley-
Including the city of Paradise
542 AM PST Wed Dec 29 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL NOON PST TODAY
ABOVE 1500 FEET...

* WHAT...Heavy wet snow occurring. Plan on difficult travel 
  conditions, including during the morning commute. Additional 
  wet snow accumulations of up to two inches are expected.

* WHERE...Northeast Foothills/Sacramento Valley.

* WHEN...Until noon today.

* ADDITIONAL DETAILS...Be prepared for significant reductions in 
  visibility at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for wet snow means there will be snow
covered roads and limited visibilities. Travel is not recommended
while the warning is in effect. 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 you are
calling from can be obtained by calling 5 1 1.

$$

CAZ067-292300-
/O.CON.KSTO.WS.W.0012.000000T0000Z-211230T0000Z/
Motherlode-
Including the city of Grass Valley
542 AM PST Wed Dec 29 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 PM PST THIS
AFTERNOON ABOVE 1500 FEET...

* WHAT...Heavy snow occurring. Plan on difficult travel 
  conditions, including during the morning commute. Additional 
  snow accumulations of 1 to 3 inches, with localized amounts up 
  to 6 inches, are expected.

* WHERE...Motherlode.

* WHEN...Until 4 PM today.

* ADDITIONAL DETAILS...Be prepared for significant reductions in 
  visibility at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow means there will be snow covered
roads and limited visibilities. Travel is not recommended while
the warning is in effect. 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 you are
calling from can be obtained by calling 5 1 1.

$$

CAZ069-292300-
/O.CON.KSTO.WS.W.0012.000000T0000Z-211230T0600Z/
West Slope Northern Sierra Nevada-
542 AM PST Wed Dec 29 2021

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

* WHAT...Heavy snow occurring. Plan on difficult travel 
  conditions, including during the morning commute. Additional 
  snow accumulations of 5 to 8 inches, with localized amounts up 
  to 14 inches, are expected.

* WHERE...West Slope Northern Sierra Nevada.

* WHEN...Until 10 PM today.

* ADDITIONAL DETAILS...Be prepared for significant reductions in 
  visibility at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow means there will be snow covered
roads and limited visibilities. Travel is not recommended while
the warning is in effect. 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 you are
calling from can be obtained by calling 5 1 1.

$$

CAZ013-063-292000-
/O.CON.KSTO.WW.Y.0025.000000T0000Z-211229T2000Z/
Shasta Lake Area / Northern Shasta County-
Mountains Southwestern Shasta County to Western Colusa County-
Including the city of Shasta Dam
542 AM PST Wed Dec 29 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON PST TODAY
ABOVE 1000 FEET...

* WHAT...Snow occurring. Plan on slippery road conditions, 
  including during the morning commute. Additional snow 
  accumulations of up to one inch are expected.

* WHERE...Shasta Lake Area / Northern Shasta County and 
  Mountains Southwestern Shasta County to Western Colusa County.

* WHEN...Until noon today.

* ADDITIONAL DETAILS...Be prepared for reduced visibilities at 
  times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Be prepared for snow covered
roads and limited visibilities, and use caution while driving.
The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

$$

349 
WWUS46 KSTO 291954
WSWSTO

URGENT - WINTER WEATHER MESSAGE
National Weather Service Sacramento CA
1154 AM PST Wed Dec 29 2021


CAZ068-292100-
/O.EXP.KSTO.WS.W.0012.000000T0000Z-211229T2000Z/
Western Plumas County/Lassen Park-
1154 AM PST Wed Dec 29 2021

...WINTER STORM WARNING WILL EXPIRE AT NOON PST TODAY...

$$

CAZ066-292100-
/O.EXP.KSTO.WS.W.0012.000000T0000Z-211229T2000Z/
Northeast Foothills/Sacramento Valley-
Including the city of Paradise
1154 AM PST Wed Dec 29 2021

...WINTER STORM WARNING WILL EXPIRE AT NOON PST TODAY ABOVE
1000 FEET...

$$

CAZ013-063-292100-
/O.EXP.KSTO.WW.Y.0025.000000T0000Z-211229T2000Z/
Shasta Lake Area / Northern Shasta County-
Mountains Southwestern Shasta County to Western Colusa County-
Including the city of Shasta Dam
1154 AM PST Wed Dec 29 2021

...WINTER WEATHER ADVISORY WILL EXPIRE AT NOON PST TODAY ABOVE
1000 FEET...

$$

CAZ067-300000-
/O.CON.KSTO.WS.W.0012.000000T0000Z-211230T0000Z/
Motherlode-
Including the city of Grass Valley
1154 AM PST Wed Dec 29 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 PM PST THIS
AFTERNOON ABOVE 2000 FEET...

* WHAT...Snow occurring. Plan on difficult travel conditions, 
  including during the evening commute. Additional wet snow 
  accumulations of up to one inch are expected.

* WHERE...Motherlode.

* WHEN...Until 4 PM today.

* ADDITIONAL DETAILS...Be prepared for significant reductions in 
  visibility at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for wet snow means there will be snow
covered roads and limited visibilities. Travel is not recommended
while the warning is in effect. 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 you are
calling from can be obtained by calling 5 1 1.

$$

CAZ069-300400-
/O.CON.KSTO.WS.W.0012.000000T0000Z-211230T0600Z/
West Slope Northern Sierra Nevada-
1154 AM PST Wed Dec 29 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 PM PST THIS
EVENING ABOVE 2000 FEET...

* WHAT...Heavy snow occurring. Plan on difficult travel 
  conditions, including during the evening commute. Additional 
  snow accumulations of 2 to 4 inches, with localized amounts up 
  to 6 inches, are expected.

* WHERE...West Slope Northern Sierra Nevada, including Interstate
  80 over Donner Pass, Highway 50 over Echo Summit and Highway 88
  over Carson Pass.

* WHEN...Until 10 PM today.

* ADDITIONAL DETAILS...Be prepared for significant reductions in 
  visibility at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow means there will be snow covered
roads and limited visibilities. Travel is not recommended while
the warning is in effect. 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 you are
calling from can be obtained by calling 5 1 1.

$$

707 
WWUS46 KSTO 300005
WSWSTO

URGENT - WINTER WEATHER MESSAGE
National Weather Service Sacramento CA
405 PM PST Wed Dec 29 2021


CAZ067-300115-
/O.EXP.KSTO.WS.W.0012.000000T0000Z-211230T0000Z/
Motherlode-
405 PM PST Wed Dec 29 2021

...WINTER STORM WARNING HAS EXPIRED...


$$

CAZ069-300600-
/O.CON.KSTO.WS.W.0012.000000T0000Z-211230T0600Z/
West Slope Northern Sierra Nevada-
405 PM PST Wed Dec 29 2021

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

* WHAT...Snow showers occurring. Plan on difficult travel
  conditions, including during the evening commute. Additional
  snow accumulations of 1 to 3 inches are expected.

* WHERE...West Slope Northern Sierra Nevada.

* WHEN...Until 10 PM today.

* ADDITIONAL DETAILS...Be prepared for significant reductions in 
  visibility at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow means there will be snow covered
roads and limited visibilities. Travel is not recommended while
the warning is in effect. 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 you are
calling from can be obtained by calling 5 1 1.

$$

640 
WWUS46 KSTO 300610
WSWSTO

URGENT - WINTER WEATHER MESSAGE
National Weather Service Sacramento CA
1010 PM PST Wed Dec 29 2021


CAZ069-300715-
/O.EXP.KSTO.WS.W.0012.000000T0000Z-211230T0600Z/
West Slope Northern Sierra Nevada-
1010 PM PST Wed Dec 29 2021

...WINTER STORM WARNING HAS EXPIRED...

The snow has ended, but slippery road conditions will continue and
travel is highly discouraged.

$$

Area Forecast Discussion
National Weather Service Sacramento CA
218 PM PST Mon Dec 27 2021

.SYNOPSIS...
Scattered Valley showers and mountain snow showers continue through
this evening. A cold, weak system will bring some light showers to
the area Tuesday and Wednesday with low snow levels anticipated.
Light snow will be possible over the mountains, into the lower
foothills, and possibly across portions of the northern Sacramento
Valley. Cold and drier weather expected late week.

&&

.DISCUSSION...
Early afternoon radar indicates only scattered showers across
portions of the Valley, with continued mountain snow showers over
the Sierra Nevada. Snow levels continue to fall this afternoon with
significant snow reported above 3000 feet, and even amounts as low
as 1500 feet. Clearing skies are noted behind this system with much
of the Valley already seeing some sunshine. Overnight tonight, cold
air behind this system will bring some chilly overnight lows to the
Valley ranging from the mid 30s to the upper 20s. With lows trending
a bit warmer and cloud cover increasing overnight ahead of the next
weak system, cancelled the Freeze Watch due to widespread freezing
temperatures not being anticipated.

Snow levels continue to fall from north to south today reaching
between 500-2000 feet late tonight, with locally lower levels across
the far northern Sacramento Valley and surrounding areas. A
relatively weak shortwave passes over the area tonight, with a
slightly stronger system expected Tuesday night into Wednesday. Very
light QPF amounts are associated with this first system on Tuesday
with amounts across the area less than a tenth of an inch and
potentially some Valley locations only experiencing overcast
skies. With the cold temperatures and low snow levels still in
place, the lower foothills and portions of the northern Sacramento
Valley have the potential to receive anywhere from a dusting to
around an inch of snow (depending on location) early Tuesday
morning into the afternoon.

A bit more moisture is seen Tuesday night into Wednesday and will
bring the potential for more impactful low snow across the lower
foothills and extending into the northern Sacramento Valley. valley
snow continues to look possible, although amounts were decreased
slightly from the previous forecast due to slightly less QPF. Snow
looks to impact Redding beginning late Tuesday night into the
morning hours. Have Valley snow roughly as far south as Red Bluff
and also all the surrounding lower foothills, including as far south
as the Motherlode region (although snow levels are slightly higher
towards the southern portion of the CWA). Snow amounts for Valley
locations/lower during this time range from a dusting to a few
inches, with up to 7 inches over the mountains (above 3000 feet).
Still will reiterate that there is much uncertainty with exact
amounts and how low snow levels will be. Per the previous
discussion, a change in just 1 or 2 degree can be the difference
between all snow or all rain in lower elevations. Have held off on
any products for now due to this uncertainty.

This system moves out of the area late Wednesday with shortwave
ridging moving in behind it. Cold temperatures continue to end
the year. A small chance for some mountain snow showers Friday as
a system passes, but QPF looks very limited.

&&

.EXTENDED DISCUSSION (Friday THROUGH Monday)...

Drier, but continued chilly/cold weather pattern setting up for
NorCal for the first days of the extended forecast period. ECMWF
EFI suggests the coldest minimum temperatures should occur over
the northern Sacramento Valley. Morning lows will trend 5 to 15
degrees below normal Saturday and Sunday with Valley low
temperatures in the mid 20s to low 30s. Ensemble clusters depict a
shortwave dropping into the region late Thursday into Friday
afternoon that could bring some light snow to the northern
mountains and the northern Sierra. Otherwise, dry weather returns
late Friday into the weekend as ridging moves overhead. Ensembles
hint at a troughing pattern developing that could widespread
precipitation to interior NorCal early next week. However,
uncertainty remains as cluster analysis shows some differences
regarding timing and placement of the trough.

&&

.AVIATION...

VFR conditions in the Valley through this evening except for MVFR
conditions in showers and/or isolated thunderstorms. Scattered
snow showers continue over the Sierra through this evening with
areas of MVFR/IFR/LIFR conditions. Precipitation activity
increases after 08Z- 10Z Tuesday with MVFR/IFR/LIFR conditions due
to passing showers, low cigs and visibility restrictions. Light
snow showers possible in the northern Sacramento Valley, including
KRDD and KRBL after 12Z Tuesday.

&&

.STO WATCHES/WARNINGS/ADVISORIES...
Winter Storm Warning until 9 PM PST this evening for Motherlode-
Northeast Foothills/Sacramento Valley-West Slope Northern Sierra
Nevada-Western Plumas County/Lassen Park.

&&