1 hail, 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 Hanford, CA wrote its last area forecast discussion before the first event at Apr 20, 3:38 PM PST, 2 hours 52 minutes earlier.
INTERIOR CENTRAL CALIFORNIA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY - HANFORD CA
400 PM PDT FRI APR 20 2001
DELAYED FROM TECHNICAL PROBLEMS. POTENT LATE SEASON STORM WILL BEAR
DOWN ON THE CWA LATER THIS AFTN AND TONIGHT...BRINGING LOTS OF SNOW
INTO THE SIERRA AND A DECENT SHOT OF RAFL ACROSS THE VALLEY. MODELS
ARE SIMILAR WITH TIMING DYNAMIC COLD LOW OVER THE BAY AREA THIS
EVENING...OVER THE VALLEY LATE TONIGHT AND INTO EAST KERN COUNTY
EARLY SAT.
VERY IMPRESSIVE OROGRAPHICS AND DEEP UVM...EXPECT TOTALS OF 1 TO 2+
FEET+ IN HIER ELEVS OF SIERRA WITH ABOUT 3-6 INCHES POSSIBLE NEAR
3000 FEET. RAFL IN SJ VALLEY AVERAGE ABOUT .5 WITH UP TO AN INCH OR
MORE POSSIBLE. SNOW LEVELS TO DROP QUITE LOW FOR APRIL...BASED ON
LOW LEVELS ALREADY REPORTED TO NORTH IN HEAVIER SHOWERS WILL INDICATE
DOWN TO 2000-2500 FEET WITH LOWER SNOW LEVELS IN HEAVIER SHOWERS.
ISSUANCE OF WINTER WEATHER ADVISORY FOR SNOW/WINDS COMBINATION IN
KERN MTNS LATER TONITE/SAT MORN. STILL CONCERNED FOR POSSIBILITY OF
SNOW ACCUMULATION EVEN TO KERN DESERT FLOOR ABT 2500 FT WITH UPPER
LOW CORE AND COLDER AIR POOL PASSING CLOSE BY. EXPECT DESERT WINDS
TO BE NEAR ADVISORY CRITERIA AS WELL.
PRECIPITATION WILL DIMINISH QUICKLY ON SAT AS SYSTEM REMAINS
PROGRESSIVE. UPPER RIDGE BUILDS RAPIDLY INTO REGION FOR SUNDAY AND
EARLY NEXT WEEK BRINGING A CONSIDERABLE WARMUP IN A RELATIVELY SHORT
TIME. WITH STRONG SNOWMELT WILL LOOK FOR HEAVIER FLOW ALONG SOME
RIVERS NEXT WEEK.
RIDGE TO DOMINATE THRU WED THEN SHIFT FURTHER EAST AS ANOTHER TROUGH
THREATENS BY FRI/LATE WEEK. ALTHOUGH MRF SOLUTION WOULD TRANSLATE TO
CHC SHOWERS IN NORTH SECTIONS OF SIERRA BY FRI...AT THIS TIME IN
COORD WITH ADJACENT OFFICES WILL KEEP DRY AND JUST INDICATE COOLER
AND BREEZY.
.HNX...WINTER STORM WARNING TONIGHT AND EARLY SATURDAY MORNING FROM
YOSEMITE NATIONAL PARK TO THE KERN COUNTY LINE.
...WINTER WEATHER ADVISORY FOR THE KERN COUNTY MOUNTAINS TONIGHT
AND SATURDAY MORNING.
LAVISCAZ098-099-211100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY - HANFORD CA 450 PM PDT FRI APR 20 2001 ...WINDY WITH SNOW SHOWERS POSSIBLE BY SATURDAY MORNING... A STRONG LATE SEASON STORM WILL MOVE INTO CENTRAL CALIFORNIA TONIGHT AND PASS NEAR THE KERN COUNTY DESERTS EARLY SATURDAY. THIS STORM WILL BRING SOME SHOWERS INTO THE DESERT...MAINLY LATE TONIGHT AND EARLY SATURDAY MORNING. AS COLDER AIR ARRIVES BY EARLY SATURDAY...SNOW LEVELS COULD DROP AS LOW AS 2500 FEET WITH LOCALLY HEAVY WET SNOW SHOWERS. LOCAL SNOW ACCUMULATION WILL BE POSSIBLE ON SATURDAY MORNING... ESPECIALLY OVER HIGHER TERRAIN. IN ADDITION...WINDY CONDITIONS WILL PREVAIL TONIGHT AND SATURDAY. WEST TO SOUTHWEST WINDS WILL INCREASE TO 20 TO 40 MPH WITH LOCALLY STRONGER GUSTS. PERSONS TRAVELING INTO THE KERN COUNTY DESERTS SHOULD PREPARE FOR GUSTY WINDS AND THE POSSIBILITY OF SLIPPERY ROAD SURFACES. STAY TUNED TO NOAA WEATHER RADIO...OR YOUR FAVORITE NEWS SOURCE FOR THE LATEST UPDATES ON THIS STORM. LAVIS
The San Joaquin Valley radar (KHNX), 101 km away, was scanning. The volume nearest the first event began at 02:28 UTC.
1 hail. Local standard time, as filed.
Small hail southwest of Chowchilla caused more than $3.25M in damage to 600 acres of apples and 40 acres of cherries.
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: 5241069.