Heavy Snow in California, April 6 to 7, 2001

Name: Heavy Snow in California, April 6 to 7, 2001
Start: 2001-04-06T17:32
End: 2001-04-07T05:32
Location: California

April 6 to 7, 2001 · NWS REV · 1 event in 1 county or zone

Spotter in Mammoth Lakes, CA reported 12 inches of snow in 12 hours.

Where it happened

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.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 0
Property damage: None recorded
Crop damage: None recorded
Events: 1

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.

What happened

The episode as NWS REV wrote it up.

Spotter in Mammoth Lakes, CA reported 12 inches of snow in 12 hours.

What forecasters said that day

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, 2:00 PM PST, 3 hours 32 minutes earlier.

Area forecast discussion, Apr 6, 2:00 PM PST, 3 hours 32 minutes before

WESTERN NEVADA AND EASTERN CALIFORNIA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RENO NV
300 PM PDT FRI APR 6 2001

COLD CLOUD TOPS EXPANDING ON IR LOOP OVER NRN AND CENTRAL CA AS UPPER
DIV INCREASES IN LFQ OF JET MAX HOOKING INTO CENTRAL CA THIS EVE.
OMEGA STRONGEST OVER NRN SIERRA EARLY THIS EVENING THEN SHIFTS S INTO
SRN SIERRA OVERNIGHT WITH PVA AND JET DYNAMICS. QPFS OF AN INCH TO AN
INCH AN A HALF IN SIERRA FROM TAHOE SWD BY SAT EVE WITH LOCALLY MORE
IN OROGRAPHICALLY FAVORED AREAS. SNOW SHOULD TAPER OFF TO SHOWERS LATE
SATURDAY THEN INCREASE AGAIN LATE SUNDAY AS SECONDARY VORT DROPS S FM
OFF PAC NW CST. QPF WITH NEXT SYSTEM AROUND A QUARTER TO A HALF AN
INCH BY MONDAY MORNING. UPPER LOW DROPS S INTO SRN CA BY TUESDAY
WITH FEW LINGERG SHOWERS OVER MONO AND MINERAL COUNTIES. DRY WITH
WARMING TREND WED INTO FRIDAY AS MRF NOW SHOWING A STRONGER RIDGE
WITH ERN PAC TROUGH RETROGRADING FURTHER W. CYLKE

.REV...WINTER STORM WARNING ABOVE 5500 FEET ZONE CAZ071 THRU
       SATURDAY MORNING...
      .WINTER STORM WARNING ABOVE 7000 FEET CAZ072 AND NVZ02
       THROUGH SATURDAY.
      .SNOW ADVISORY BELOW 7000 FEET CAZ072 AND NVZ02
       THROUGH5 SATURDAY...
      .WINTER STORM WARNING ABOVE 7000 FT CAZ073 THROUGH
       SATURDAY...
      .SNOW ADVISORY BELOW 7000 FEET CAZ073 THROUGH SATURDAY...

The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

1 heavy snow. Local standard time, as filed.

Heavy Snow, Mono

When: April 6, 5:32 PM PST to April 7, 5:32 AM PST
Where: Mono forecast zone
Reported by: TRAINED SPOTTER
Coordinates: 37.939, -118.887 (the zone’s center; the record gives no point)

What these are

Heavy Snow: Snowfall reaching the local warning threshold without the other hazards of a winter storm.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in California in 2001 Every state in 2001 This day in weather history Warnings in California, April 2001

Sources

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: 5239126.