From the National Weather Service:
A LOW PRESSURE AREA OFF THE COAST OF BRITISH COLUMBIA WILL DEEPEN
OVER THE REGION THIS WEEKEND. THIS WILL BRING COLDER TEMPERATURES
AND SHOWERS TO THE REGION. EXPECT COOLING THROUGH THE WEEKEND WITH
VALLEY DAYTIME HIGHS ONLY REACHING THE UPPER 60S TO LOWER 70S WHILE
MOUNTAIN TEMPERATURES ONLY WARMING INTO THE 40S TO MID 50S FOR SUNDAY.
SOME SHOWERS MAY START TO DEVELOP SATURDAY AFTERNOON OVER THE
NORTHERN MOUNTAINS AND SATURDAY NIGHT OVER THE SACRAMENTO VALLEY
...FOOTHILLS AND MOUNTAINS. THE BEST CHANCES OF SHOWERS WILL OCCUR
DURING MOTHERS DAY. AS UNSTABLE AIR MOVES OVER THE REGION SUNDAY
AFTERNOON THE POTENTIAL FOR VALLEY SHOWERS WILL INCREASE ALONG
WITH ISOLATED THUNDERSTORMS. SHOWERS ARE EXPECTED TO CONTINUE
SUNDAY NIGHT AND DIMINISH MONDAY EXCEPT IN WESTERN PLUMAS
COUNTY...LASSEN PARK AREA...AND THE WEST SLOPE OF THE NORTHERN
SIERRA NEVADA. PRECIPITATION AMOUNTS ARE EXPECTED TO GENERALLY BE
LESS THAN A TENTH OF AN INCH IN THE VALLEY AND LESS THAN HALF AN
INCH IN THE MOUNTAINS.
SNOW LEVELS ARE EXPECTED TO LOWER ON SUNDAY TO BETWEEN 4500 FEET
OVER THE NORTH TO AROUND 5500 FEET FOR THE WESTERN SLOPES OF THE
SIERRA NEVADA. SNOW LEVELS WILL LOWER FURTHER SUNDAY NIGHT. SEVERAL
INCHES OF SNOW ARE POSSIBLE WITH THIS SYSTEM WITH THE POTENTIAL TO
CAUSE SOME TRAVEL PROBLEMS OVER THE MOUNTAIN PASSES.
IN ADDITION...AREA RIVERS AND STREAMS WILL BE RUNNING VERY COLD AND VERY
FAST FOR THE NEXT SEVERAL WEEKS. EVERYONE GOING INTO THE WATER
SHOULD WEAR A LIFE VEST OR PERSONAL FLOTATION DEVICE. CHILDREN
THAT ARE EVEN JUST WADING ALONG A WATERWAY SHOULD WEAR A LIFE
VEST. EVEN THE STRONGEST SWIMMERS CAN SUFFER FROM HYPOTHERMIA.
PERSONS TRAVELING TO THE HIGHER ELEVATIONS OF THE MOUNTAINS OR
PLANNING OUTDOOR ACTIVITIES THIS WEEKEND SHOULD MONITOR THE
FORECAST AND CHECK FOR THE LATEST UPDATES FROM YOUR NATIONAL
WEATHER SERVICE OR LOCAL MEDIA OUTLETS.
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