An upper-level low dropped down the coast on the 21st, and moved inland over Southern California the next day. 75-inch hail falling west of Squaw Valley in Fresno County near the foothills.
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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 HNX wrote it up.
An upper-level low dropped down the coast on the 21st, and moved inland over Southern California the next day. This low triggered another thunderstorm outbreak, with hail up to 0.88 inch in diameter falling in eastern Kings County during the afternoon of September 22nd, and 0.75-inch hail falling west of Squaw Valley in Fresno County near the foothills. Flash flooding occurred in eastern Kings County, central Fresno County, and north-central Tulare County, with scattered reports of road flooding and minor mud/debris flows elsewhere in the central and southern San Joaquin Valley.
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 Sep 22, 1:18 PM PST, 3 hours 51 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY - HANFORD CA 218 PM PDT SAT SEP 22 2007 .DISCUSSION...STUBBORN UPPER CUTOFF LOW REMAINS OFFSHORE AND CURRENTLY CENTERED JUST WEST OF SANTA BARBARA COUNTY. WV/IR INDICATING THE LOW IS MOVING SLOWLY NORTH NORTHEAST. AS A S/W NEAR 40N/135W CONTINUES TO DROP SOUTHWARD...THE LOW WILL PICK UP SPEED AND CROSS OUR AREA THIS EVENING AND MOVE INTO THE GREAT BASIN OVERNIGHT AND GET PICKED UP BY AN UPPER TROUGH WHICH IS CURRENTLY PUSHING THROUGH THE PAC NW. IN THE MEANTIME...SCATTERED SHOWERS WILL CONTINUE ACROSS OUR CWFA WITH ISOLATED EMBEDDED THUNDERSTORMS UNDER THE COLD POOL ALOFT THROUGH THIS EVENING. QPF PROGS ARE INDICATING THE PRECIPITATION TAPERING OFF LATE THIS AFTERNOON SO WILL RUN THE HEAVY SNOW WARNING FOR THE SOUTHERN SIERRAS THROUGH 600 PM. A DRY NORTHWEST FLOW WILL BECOME ESTABLISHED OVER OUR AREA LATER TONIGHT AS THE LOW LIFTS OUT. RESIDUAL MOISTURE IN THE VALLEY WILL ALLOW FOR SOME UPSLOPE LOW CLOUDS TO FORM AT THE SOUTH END OF THE SAN JOAQUIN VALLEY AND ACROSS THE NORTH AND EAST FACING SLOPES OF THE TEHACHAPI MOUNTAINS BY MORNING. THESE CLOUDS WILL CLEAR OUT BY SUNDAY AFTERNOON AS THEY BURN OFF WITH DAYTIME HEATING. 12Z MODEL CONSENSUS INDICATING A DRY UPPER RIDGE BUILDING INTO CA ON MONDAY RESULTING IN A WARMING TREND ACROSS OUR AREA AS PER MET/MAV. AN UPPER TROUGH IS PROGGED TO FLATTEN THE RIDGE ON TUESDAY WHICH MAY SLOW DOWN THE ANTICIPATED WARMING TREND. A DRY WESTERLY FLOW ALOFT IS THEN EXPECTED TO PREVAIL ACROSS CA FOR THE REMAINDER OF NEXT WEEK KEEPING SKIES MOSTLY CLEAR AND TEMPS NEAR TO SLIGHTLY ABOVE CLIMO FOR LATE SEPTEMBER. && .AVIATION...A STORM SYSTEM TRACKING NE OVER THE CENTRAL CALIFORNIA INTERIOR WILL CONTINUE TO PROVIDE NUMEROUS SHOWERS AND ISOLATED THUNDERSTORMS OVER MUCH OF THE REGION THROUGH THIS EVENING. EXPECT AREAS OF MVFR AND LOCAL IFR CIGS AND VSBYS FROM RAIN AND HIGH ELEVATION SNOW SHOWERS OVER THE MOUNTAINS...WITH LOCAL MVFR VSBYS IN -SHRA/TSRA ACROSS THE SAN JOAQUIN VALLEY AND THE DESERTS. THE STORM ACTIVITY IS EXPECTED TO DIMINISH OVERNIGHT AS THE UPPER LOW MOVES EAST OF THE SIERRA BY 12Z SUNDAY. SOME LOCAL MVFR VSBYS IN BR WILL THEN BE POSSIBLE OVER THE SAN JOAQUIN VALLEY THROUGH 17Z SUNDAY...OTHERWISE VFR CONDITIONS WILL PREVAIL OVER THE AREA THROUGH 00Z MONDAY. FOR SPECIFIC DETAILS...PLEASE REFER TO THE TAFS FOR KMCE...KFAT AND KBFL...AND TWEB ROUTES 421 AND 423. && .AIR QUALITY ISSUES...NONE. && .HNX WATCHES/WARNINGS/ADVISORIES... HEAVY SNOW WARNING UNTIL 6 PM PDT THIS AFTERNOON FOR CAZ096-097. && PUBLIC: DS AVIATION/FIRE WX: JEB WEATHER.GOV/HANFORD
The San Joaquin Valley radar (KHNX), 12 km away, was scanning. The volume nearest the first event began at 01:11 UTC.
3 flash flood, 2 hail. Local standard time, as filed.
Flash flooding observed along Fargo Ave and Grangeville Blvd between 7th Ave east to the Tulare county line. Flooding was observed through 645 pm PDT.
A trained storm spotter observed hail to the size of nickels with a severe thunderstorm.
A trained storm spotter reported that Hail to the size of pennies coated the roadway.
A trained storm spotter and storm chaser observed debris from flash flooding, branches, limbs and leaves on George Smith and Sand Creek Roads near Squaw Valley after heavy rains.
A trained storm spotter noted debris of leaves, small trees and branches from flash flooding. The location was just east of Orange Cove on Sand Creek Rd.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2007Every state in 2007This day in weather historyWarnings in California, September 2007
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: 61510, 61513, 61514, 61511, 61512.