Spotter in Portola, CA reported 9 inches of snow in 24 hours.
Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS REV wrote it up.
Spotter in Portola, CA reported 9 inches of snow in 24 hours.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Reno, NV wrote its last area forecast discussion before the first event at Apr 6, 1:45 AM PST, 6 hours 15 minutes earlier.
WESTERN NEVADA AND EASTERN CALIFORNIA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RENO NV
245 AM PDT FRI APR 6 2001
NEW MODEL RUNS ARE A LITTLE SLOWER ON THE DEVELOPING FRONT AND
ASSOCIATED TROF MAKING ITS WAY TO THE AREA. COLD FRONT WILL APPROACH
THE SIERRA LATE THIS AFTERNOON WHILE THE TROF AXIS STILL REMAINS OUT
NEAR 130 WEST. MODELS SHOW A STRONG VORT MAX AT THE BASE OF THE TROF
40 NORTH 130 WEST AT 00Z AND THEN MOVE IT SOUTHEAST TO THE VICINITY OF
THE BAY AREA LATE EVENING AND THEN INLAND OVERNIGHT AND SATURDAY
MORNING. STILL SOME UNCERTAINITY AS TO QPF AMOUNTS FOR THE SIERRA AS
SYSTEM IS NOT OVERLY WET. BUT DOES APPEAR THAT THE COMBINATION OF
FAIRLY STRONG OROGRAPHICS AND DECENT DYNAMICS WILL BE ENOUGH TO
OVERCOME THE LACK OF MOISTURE AND THUS WILL HOLD ON TO THE WATCH FOR
THE SIERRA AND DELAY IT UNTIL TONIGHT AND INTO SATURDAY MORNING. BEST
DYNAMICS LOOKS TO BE FROM AROUND 03Z THROUGH 12Z. GRADIENTS DONT SEEM
TO BE STRONG ENOUGH TO WARRANT ANY ADVISORIES FOR THE WIND AND NEW
GUIDANCE IS ALSO SHOWING LESS WIND AT 700 MB. WILL TRIM BACK WINDS
JUST A LITTLE. SHOULD BE ENOUGH WIND IN THE LEE OF THE SIERRA TO
SHADOW OUT THE VALLEYS FROM PRECIP SO WILL WORD ZONES FOR MOSTLY NEAR
THE MOUNTAINS. COLD FRONT MOVES THROUGH EARLY THIS EVENING AND SNOW
LEVELS COME CRASHING DOWN TO THE VALLEY FLOORS GIVING A LIGHT DUSTING
OF SNOW WITH MAYBE A INCH OR SO IN THE FOOTHILLS. TROF WILL SLOWLY
MOVE THROUGH THE AREA ON SATURDAY BRINGING COLDER AND UNSTABLE AIR FOR
SCATTERED SNOW SHOWERS MOST EVERYWHERE. MEDIUM RANGE MODELS START TO
HAVE DIVERGING SOLUTIONS AFTER ABOUT MONDAY BUT BOTTOM LINE SEEMS TO
BE LEAVING WEAK UPPER LOW OVER THE AREA INTO EARLY TUESDAY. THIS
RESULTS IN CONTINUED WELL BELOW NORMAL HIGH TEMPS AND A CHANCE OF
SHOWERS. WILL GO ALONG WITH THE MRF AND BRING DRIER AND WARMER
CONDITIONS TO THE AREA FOR WEDNESDAY AND THURSDAY. DONALDSON
.REV...WINTER STORM WATCH ABOVE 5500 FEET ZONE 71 ABOVE 7000 FEET
ZONES 72 AND 02 THIS EVENING THROUGH SATURDAY MORNING.
WINTER STORM WATCH ABOVE 7000 FT ZN 73 TONIGHT THROUGH
SATURDAY MORNING.
LAKE WIND ADVISORY PYRAMID LAKE TODAY.The national radar mosaic for the moment the first event began.
1 winter storm. Local standard time, as filed.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2001Every state in 2001This day in weather historyWarnings in California, April 2001
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 5239131.