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Local Wx Station Data Sacramento, Northern Sierra Nevada & the Motherlode Area Current Weather Conditions
Sierra California (CAC091) Alerts
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NOAA's National Weather Service
Alerts for Sierra California  (CAC091)
Spacer Gif Last update: August 10, 2020, 3:20 PM PDT    Spacer GifIcon key
Updates every 10 Minutes
icn  FIRE WEATHER WATCH
SIERRA CALIFORNIA   (CAC091)

Effective: Tue, Aug 11, 2020 12:00pm PDT Severity: Moderate
Updated: Mon, Aug 10, 2020 12:39pm PDT Urgency: Future
Expires: Wed, Aug 12, 2020 09:00pm PDT Certainty: Possible

Areas Affected: Eastern Lassen County; Surprise Valley California; Western Lassen, Eastern Plumas, Eastern Sierra, Eastern Nevada Counties
 
Alert:
...FIRE WEATHER WATCH REMAINS IN EFFECT FROM TUESDAY AFTERNOON
THROUGH WEDNESDAY EVENING FOR THUNDERSTORMS AND NEW FIRE STARTS
TUESDAY FOLLOWED BY GUSTY WINDS AND LOW HUMIDITY WEDNESDAY...
* Changes...Wet Thunderstorms Tuesday, very dry with breezy winds
north of Interstate 80 Wednesday.
* Affected Area...Fire Zone 270 Surprise Valley California, Fire
Zone 271 Western Lassen, Eastern Plumas, Eastern Sierra, and
Eastern Nevada Counties, Fire Zone 278 Eastern Lassen County,
Fire Zone 420 Northern Sierra Front including Carson City,
Douglas, Storey, Southern Washoe, Western Lyon, and Far
Southern Lassen Counties, Fire Zone 423 West Humboldt Basin in
Pershing County and Fire Zone 458 Northern Washoe County.
* WINDS...For Tuesday, outflow winds near thunderstorms near 50
mph. For Wednesday, West winds 15-25 mph with gusts to 35 mph
north of Interstate 80.
* HUMIDITY...Afternoon humidity 10 to 15 percent each day.
Recoveries Tuesday night 50-70 percent in most valleys with
25-35 percent on mid-slopes.
* THUNDERSTORMS...Wet with 10 to 15 mph storm motion Tuesday. No
thunderstorms forecast Wednesday.
* IMPACTS...Lightning potentially creating new fires followed by
thunderstorm outflows, gusty zephyr winds, and drier air
resulting in fire spread. Be prepared for a busy period of new
fires if the forecast pans out.
* CONFIDENCE...Confidence remains medium as thunderstorms may be
rather wet Tuesday.
Instructions:
Avoid outdoor activities that can cause a spark near dry
vegetation, such as yard work, target shooting, or campfires.
Follow local fire restrictions. Check weather.gov/reno for
updates and livingwithfire.info for preparedness tips.

 

icn  SPECIAL WEATHER STATEMENT
SIERRA CALIFORNIA   (CAC091)

Effective: Mon, Aug 10, 2020 03:00pm PDT Severity: Minor
Updated: Mon, Aug 10, 2020 03:00pm PDT Urgency: Expected
Expires: Mon, Aug 10, 2020 04:15pm PDT Certainty: Observed

Areas Affected: Burney Basin, Eastern Shasta County; West Slope Northern Sierra Nevada; Western Plumas County, Lassen Park
 
Alert:
...STRONG THUNDERSTORMS WILL AFFECT HIGHER ELEVATIONS OF THE
SIERRA AND AROUND LASSEN NATIONAL PARK THROUGH 5 PM...
Scattered strong thunderstorms will affect the higher elevations of
the Sierra Nevada, including Mt. Lassen National Park this
afternoon. The strongest storms will generally be along and south of
the Interstate 80 and Highway 50 corridor, to Yosemite National
Park. Dangerous lightning, dime to nickel size hail, brief
downpours and gusty downdraft winds are possible with these storms.
In addition to I-80 and Highway 50, the storms may impact Highway 4,
108 and 120 near the Sierra Crest. Motorists should be prepared for
rapidly changing road conditions.
If you are hiking, camping or fishing in a mountain lake be on the
lookout for threatening weather and be prepared to move to safety
quickly. Remember, lightning can strike out to 10 miles from the
parent thunderstorm. If you can hear thunder, you are close enough
to be struck by lightning.

 

icn  SPECIAL WEATHER STATEMENT
SIERRA CALIFORNIA   (CAC091)

Effective: Mon, Aug 10, 2020 03:00pm PDT Severity: Minor
Updated: Mon, Aug 10, 2020 01:14pm PDT Urgency: Expected
Expires: Mon, Aug 10, 2020 05:00pm PDT Certainty: Observed

Areas Affected: Greater Lake Tahoe Area; Lassen-Eastern Plumas-Eastern Sierra Counties; Mono
 
Alert:
...Sierra Storms Starting to Build...
Isolated thunderstorms are starting to build over the high Sierra
as of 110 PM Monday. This trend will continue through the late
afternoon, with isolated-scattered storms along the Sierra
between Tioga Pass, Sonora Pass, Lake Tahoe, Donner Pass, and
Susanville. Storms will likely push into the Western Nevada
Sierra Front by late afternoon or early evening.
Storms will be slow moving so they will drop heavy rainfall in
spots. Strong outflow winds, lightning, small hail, and rapid
temperature drops are also likely with any storms.
With storms developing, now is the time to consider seeking sturdy
shelter if out in the mountains or on Sierra lakes.

 





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