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Local Wx Station Data Sacramento, Northern Sierra Nevada & the Motherlode Area Current Weather Conditions

NOAA's National Weather Service
Northern CA Weather Alerts for Sierra California   (CAC091)


Effective: Sun, Mar 18, 2018 02:26pm PDT Severity: Minor
Updated: Sun, Mar 18, 2018 02:26pm PDT Urgency: Expected
Expires: Mon, Mar 19, 2018 06:00am PDT 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
...Another Series of Storm Systems This Week...
*Localized urban and flood stream flooding possible this week.
*Chain controls and hazardous travel across Sierra passes,
especially late this week.
*Localized power outages due to gusty winds and downed trees.
.Forecast Confidence...
.Timing and Strength...
*Tuesday through Friday
*Initially higher snow levels, then lowering Thursday through
*1 to 2 inches of rain possible in the Valley, 2 to 6 inches
over the mountains.
*12 to 48 inches of snow possible over higher Sierra passes.
.Weather Summary...
California has a couple days break in between storm systems. The
next storm system is already on our doorstep, with light
precipitation expected to begin across the region on Tuesday. The
period of heaviest precipitation and gusty winds is currently
projected to be Wednesday through Thursday. Snow levels will start
out initially rather high, but colder air will arrive late this
week, and another round of heavy snow is expected for late this



Effective: Sun, Mar 18, 2018 02:26pm PDT Severity: Minor
Updated: Sun, Mar 18, 2018 04:08pm PDT Urgency: Expected
Expires: Mon, Mar 19, 2018 05:00am PDT Certainty: Observed

Areas Affected: Greater Lake Tahoe Area; Lassen-Eastern Plumas-Eastern Sierra Counties; Mono; Surprise Valley California
Light valley rain and Sierra snow and rain will develop Tuesday
and Tuesday night, with some travel impacts possible for Sierra
and northeast California passes. A much stronger system will bring
lower valley rain, Sierra rain and snow, and breezy to windy
conditions starting on Wednesday and continuing until a cold front
moves through Thursday night.
Impact details Wednesday through Friday:
* Snow levels will start out fairly high, between 7000 and 8500
feet, Wednesday and Wednesday night before falling on Thursday
as a cold front approaches the region. Several feet of snowfall
are likely in the high Sierra by Friday morning. Snowfall in
the Tahoe Basin, and in Mono County below 8000 feet, is more
uncertain and will depend on how fast snow levels fall. Still,
significant travel impacts for the main Sierra passes including
Interstate 80 and Highway 50 are likely on Thursday, continuing
into Friday morning...with impacts to Highway 395 in Mono County
possible by Thursday night.
* For Wednesday and Thursday, rain is expected to fall in the
valleys and foothills of western Nevada..with rain possibly
changing briefly to snow after the cold front Thursday night. It
is too soon to tell if valleys will get accumulating snowfall,
but the Friday morning commute would be the period most likely
affected if snow does accumulate.
* Winds are expected to be gusty, which could bring periodic impacts
to aviation and high-profile vehicles.



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