1 thunderstorm wind, as filed by the National Weather Service.
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 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 San Diego, CA wrote its last area forecast discussion before the first event at Apr 21, 2:41 AM PST, 5 hours 17 minutes earlier.
EXTREME SOUTHWESTERN CALIFORNIA AREA FORECAST DISCUSSION...AMD
NATIONAL WEATHER SERVICE SAN DIEGO CA
230 AM PDT SAT APR 21 2001
...SYNOPSIS...
A POWERFUL STORM MOVING ACROSS SOUTHERN CALIFORNIA WILL MAKE IT FEEL
MORE LIKE WINTER THAN SPRING TODAY...WITH GUSTY WINDS AND
TEMPERATURES WAY BELOW AVERAGE. SCATTERED SHOWERS AND MOUNTAIN SNOWS
WILL TAPER OFF THIS AFTERNOON AND EVENING AS THE STORM MOVES EAST.
SUNNY AND WARMER ON SUNDAY AS HIGH PRESSURE BUILDS OVER THE WEST.
...DISCUSSION...
IMPRESSIVE DYNAMICS WITH THE DIGGING TROF OFF THE COAST THIS
MORNING. WATER VAPOR IMAGERY SHOWED TWO VORTICITY CENTERS AT
08Z...ONE OVER PT CONCEPTION MOVING SE THAT WAS BRING MODERATE TO
HEAVY SNOW TO THE LA AND SBD COUNTY MOUNTAINS...AND A SECOND ONE
OVER THE COASTAL WATERS NEAR MONTEREY. THE 06Z MESO ETA HAS PICKED
UP ON THESE FEATURES THE BEST THIS MORNING...AND DIG THEM RAPIDLY
SOUTH ON A 120 KT 300 MB JET. FAVORABLE LEFT FRONT QUADRANT JET
DYNAMICS...STRONG UVVS TO 20 MB/SEC...AND VERY COLD 500 MB TEMPS OF
-28 C WILL BRING OCCASIONAL SNOW TO THE MTNS INTO THE AFTERNOON.
SNOW LEVELS WILL FALL TO 3500 FEET AS 850 MB TEMPS FALL TO 0C...WITH
SEVERAL INCHES OF ACCUMULATION ABOVE 5000 FEET. COMBINED EFFECTS OF
STRONG WINDS AND SNOW SHOWERS WARRANT A SNOW ADVISORY FOR THE MTNS
ABOVE 5000 FEET.
WITH STRONG CAA ALOFT...ANY SUN WE GET TODAY WILL PRODUCE EVEN
STEEPER LAPSE RATES AND CANT RULE OUT THE CHANCE FOR
THUNDERSTORMS...ALTHOUGH THE BEST CHANCE WILL BE LATE MORNING OR
EARLY AFTERNOON. BEST THUNDERSTORM CHANCES WILL BE CLOSEST TO THE
COLD CORE ALOFT WHERE THE MESOETA FCST LIS OF -1. BUT A
THUNDERSTORM IS NOT OUT OF THE QUESTION JUST ABOUT ANYWHERE IN THE
CWA AS TEMPS FALL TO -22C AS FAR SOUTH AS SAN DIEGO COUNTY. WINDS
WILL ALSO BE A FACTOR...GUSTING TO 40-50 MPH AT TIMES IN THE
MTNS...WHICH WILL BE COVERED IN WINTER WEATHER ADVISORIES.
SHOWERS WILL END LATER THIS AFTERNOON OR EVENING AS THE TROF MOVES
EAST. STRONG DVVS SPREAD FROM NORTHWEST TO SOUTHEAST ACROSS THE
REGION THIS AFTERNOON...TRANSPORTING SOME OF THIS UPPER LEVEL WIND
ENERGY TO THE SURFACE WHERE IT WILL GET QUITE WINDY IN SOME SPOTS.
AFTER A COLD DAY TODAY...HEIGHTS RECOVER SUNDAY AND TEMPERATURES
WILL BE 5 TO 10 DEGREES WARMER. THEN A BUILDING RIDGE WILL DOMINATE
FOR WARM DRY WEATHER THROUGH AT LEAST MIDWEEK.
SAN 700
.SAN...WINTER WEATHER ADVISORY...SEE LAXWSWSAN.
SMALL CRAFT ADVISORY......SEE LAXCWFSGX
MOEDEThe San Diego radar (KNKX), 28 km away, was scanning. The volume nearest the first event began at 15:55 UTC.
1 thunderstorm wind. Local standard time, as filed.
Pea size hail and with wind gusts estimated between 45 and 60 mph were reported by spotters.
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: 5237562.