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NOAA's National Weather Service
Northern CA Weather Alerts for Alpine California   (CAC003)

icn  HIGH WIND WATCH
ALPINE CALIFORNIA   (CAC003)

Effective: Tue, Dec 19, 2017 07:00pm PST Severity: Severe
Updated: Mon, Dec 18, 2017 03:35am PST Urgency: Future
Expires: Wed, Dec 20, 2017 12:00pm PST Certainty: Possible

Areas Affected: Greater Lake Tahoe Area; Lassen-Eastern Plumas-Eastern Sierra Counties; Mono; Surprise Valley California
 
Alert:
...HIGH WIND WATCH IN EFFECT FROM TUESDAY EVENING THROUGH
WEDNESDAY MORNING...
The National Weather Service in Reno has issued a High Wind
Watch, which is in effect from Tuesday evening through Wednesday
morning.
* Timing: Tuesday night through Wednesday morning.
* Winds: Wind gusts 50 to 60 mph in the valleys with gusts up to
75 mph in wind prone areas. Gusts of 120 mph along the Sierra
Crest.
* Impacts: Some disruption to air travel and high profile vehicles
should be expected. Damage to trees, fences and other light
infrastructure will be possible.
Instructions:
Now is the time to secure loose outdoor items such as patio
furniture, holiday decorations, and trash cans before winds
increase which could blow these items away. The best thing to do
is prepare ahead of time by making sure you have extra food and
water on hand, flashlights with spare batteries and/or candles in
the event of a power outage.

 

icn  SPECIAL WEATHER STATEMENT
ALPINE CALIFORNIA   (CAC003)

Effective: Mon, Dec 18, 2017 03:45am PST Severity: Minor
Updated: Mon, Dec 18, 2017 03:45am PST Urgency: Expected
Expires: Mon, Dec 18, 2017 04:00pm PST Certainty: Observed

Areas Affected: Burney Basin, Eastern Shasta County; Carquinez Strait and Delta; Central Sacramento Valley; Clear Lake, Southern Lake County; Motherlode; Mountains Southwestern Shasta County to Northern Lake County; Northeast Foothills, Sacramento Valley; Northern Sacramento Valley; Northern San Joaquin Valley; Shasta Lake Area, Northern Shasta County; Southern Sacramento Valley; West Slope Northern Sierra Nevada; Western Plumas County, Lassen Park
 
Alert:
...Showers Return to the Region Tuesday Night into Wednesday...
A potent, quick moving, weather system will bring showers to
interior NorCal Tuesday night into Wednesday. Snow levels will
lower to around 3000 to 4000 feet Tuesday night, and then below
2000 feet by later Wednesday. 3 to 6 inches of snow are expected
through the northern Sierra Nevada passes while some of the higher
peaks will see up to 8 inches of snowfall accumulation. Improving
conditions are expected Wednesday night behind the system.
Impacts:
Motorists traveling into the mountains should be prepared for
winter weather conditions and carry chains. Slick roads can be
expected.
Rainfall Totals: Under a quarter inch for the Central Valley with
up to three quarters of an inch over portions of the foothills and
mountains.
Snowfall Totals: 3 to 6 inches above 4500 feet with up to 8 inches
over the higher peaks.
Winds: Locally gusty southwest wind to 50 mph or higher through
the passes.

 

icn  SPECIAL WEATHER STATEMENT
ALPINE CALIFORNIA   (CAC003)

Effective: Mon, Dec 18, 2017 03:45am PST Severity: Minor
Updated: Mon, Dec 18, 2017 03:22am PST Urgency: Expected
Expires: Mon, Dec 18, 2017 03:30pm PST Certainty: Observed

Areas Affected: Greater Lake Tahoe Area; Lassen-Eastern Plumas-Eastern Sierra Counties; Mono; Surprise Valley California
 
Alert:
A very strong cold front will move through the Sierra and western
Nevada Tuesday night into Wednesday. Likely impacts from this storm
will be: very strong potentially damaging winds, widespread snow
down to all valley floors, followed by very cold temperatures.
* Winds are forecast to become very strong with damaging wind
gusts possible. Winds in western Nevada could reach into the 50
to 60 mph range with wind prone areas potentially exceeding 75
mph. The duration of the strongest winds is expected to be
relatively short, around 3 to 6 hours. Due to the timing of the
winds occurring overnight, the wind gusts could be especially
erratic with near calm conditions one minute and very strong
wind gusts the next. Strong wind shear and turbulence is likely
ahead of the front.
* Snow is expected to be an intense short duration event with snow
falling at all elevations, even `down here` in Reno. Current
expectations is for 1-2 inches of snowfall in the valleys of
western Nevada with most of it likely falling in 1-2 hours along
the front. Recent simulations have shifted the system westward
increasing the potential snow accumulation in the Sierra with
the current forecast for 3 to 6 inches of snow. Timing of this
snowfall will likely have impacts on the Wednesday morning
commute.
* Very cold air behind the front will bring the coldest
temperatures of the season. By Thursday, high temperatures in
western Nevada will not get out of the 30s and depending on
snowfall may only be around freezing. Overnight lows will drop
into the teens and single digits.

 



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