177
WWUS46 KSTO 211802
WSWSTO
URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE SACRAMENTO CA
1102 AM PDT TUE APR 21 2026
CAZ128-130-133-136-139-230000-
/O.CON.KSTO.WS.W.0004.000000T0000Z-260423T0000Z/
LASSEN VOLCANIC NP-SIERRA (TEHAMA-PLUMAS) ABOVE 3000 FT-SIERRA
(SIERRA-PLACER) ABOVE 5000 FT-SIERRA (EL DORADO-AMADOR) ABOVE
5000 FT-SIERRA (CAL-TUO) ABOVE 5000 FT-
INCLUDING THE CITIES OF TWAIN HARTE, ARNOLD, LASSEN NATIONAL
PARK, BLUE CANYON, KINGVALE, DONNER PEAK, CARSON PASS, MINERAL,
AND QUINCY
1102 AM PDT TUE APR 21 2026
...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM PDT WEDNESDAY
ABOVE 5000 FEET...
* WHAT...HEAVY SNOW. ADDITIONAL SNOW ACCUMULATIONS OF UP TO 6 TO 12
INCHES ABOVE 5000 FEET, WITH UP TO 18 INCHES AT THE HIGHEST PEAKS.
MINOR ACCUMULATIONS OF UP TO 2 INCHES POSSIBLE DOWN TO 4500 FEET.
SOUTHWEST WINDS COULD GUST AS HIGH AS 50 MPH.
* WHERE...NORTHERN SIERRA NEVADA AND SOUTHERN CASCADES ABOVE 5000
FEET, INCLUDING HIGHWAY 50, INTERSTATE 80 AND LASSEN VOLCANIC
NATIONAL PARK.
* WHEN...UNTIL 5 PM PDT WEDNESDAY.
* IMPACTS...TRAVEL COULD BE VERY DIFFICULT. THE HAZARDOUS CONDITIONS
COULD IMPACT THE TUESDAY AND WEDNESDAY COMMUTES.
* ADDITIONAL DETAILS...SNOW LEVELS 5500 TO 6500 FEET TODAY, LOWERING
TO 4500 TO 5500 FEET BY EARLY WEDNESDAY. LOCALLY LOWER SNOW LEVELS
POSSIBLE IN HEAVIER CONVECTIVE SHOWERS. HEAVIEST SNOWFALL EXPECTED
THIS AFTERNOON AND EVENING WITH SNOWFALL RATES OF 1 TO 2 INCHES
PER HOUR AT TIMES.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
CHECK THE LATEST ROAD CONDITIONS FROM CALTRANS ONLINE AT
QUICKMAP.DOT.CA.GOV OR DIAL 5 1 1.
FOR MORE INFORMATION, VISIT US AT WWW.WEATHER.GOV/STO/
IDS
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