A hot and humid airmass, combined with an approaching upper level trough, contributed to isolated strong thunderstorms across the San Joaquin valley on the 30th and 31st of August. Late at night on the 30th, a strong thunderstorm knocked out power to over 1500 Avenal residents.
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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.
A hot and humid airmass, combined with an approaching upper level trough, contributed to isolated strong thunderstorms across the San Joaquin valley on the 30th and 31st of August. Late at night on the 30th, a strong thunderstorm knocked out power to over 1500 Avenal residents. Similarly, 800 customers in Dinuba were without power due to strong thunderstorms. In Visalia, a tree was knocked down by gusty winds and lightning, causing minor property damage on the 30th.
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 Aug 30, 8:55 PM PST, 2 hours 5 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY - HANFORD CA 955 PM PDT THU AUG 30 2007 .UPDATE... WILL UPDATE FORECAST TO REMOVE THIS AFTERNOON PERIOD. && .DISCUSSION... THUNDER ACTIVITY HAS DIMINISHED SIGNIFICANTLY BUT A FEW CELLS HAVE REDEVELOPED IN NW KERN COUNTY AND NORTH TULARE COUNTY. RADAR PRECIPITATION ESTIMATES INDICATE THE MORE WIDESPREAD RAIN OCCURRED OVER THE SIERRA NORTH OF KINGS CANYON AND ACROSS FRESNO COUNTY AS WELL AS CENTRAL MADERA COUNTY. FURTHER SOUTH STRONGER THUNDERSTORMS PROVIDED LOCALLY HEAVY RAIN BUT MORE SCATTERED. MANY RAWS STATIONS IN THE SIERRA REPORTED A QUARTER TO HALF AN INCH AND LOCALLY OVER AN INCH IN THE TULARE COUNTY MOUNTAINS AND TEHACHAPIS. MODELS HAVE HAD A DIFFICULT TIME WITH THIS DISTURBANCE AND SUBTROPICAL MOISTURE BUT PROG A SMALL VORT MAX PUSHING EAST OUT OF THE AREA AROUND 06Z. THUS EXPECT ENDING OF STORM ACTIVITY NEAR MIDNIGHT. THE DISTURBANCE IS DIFFICULT TO LOCATE ON THE WATER VAPOR CHANNEL AND APPEARS TO BE AT THE MID LEVELS OF THE ATMOSPHERE. IMPRESSIVE TROPICAL LIKE DEW POINTS IN KINGS AND TULARE COUNTIES. SEVERAL STATIONS REPORTING AROUND 70 DEGREES WHICH ARE JUST AS HIGH AS IN HAWAII. CLEARING SKIES AFTER MIDNIGHT SHOULD ALLOW TEMPERATURES TO FALL BELOW 80 DEGREES HEAT INDEX. THUS HEAT WARNING WILL NOT BE NEEDED BUT WILL CONTINUE WITH THE HEAT ADVISORY. && .AVIATION...SCATTERED SHOWERS AND THUNDERSTORMS NORTH OF KERN COUNTY WILL GRADUALLY DISSIPATE THROUGH LATE THIS EVENING. OTHERWISE...VFR CONDITIONS CAN BE EXPECTED THROUGH 00Z SATURDAY. 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... HEAT ADVISORY UNTIL 7 PM PDT SATURDAY FOR CAZ089>094. && MV/JDB WEATHER.GOV/HANFORD
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY - HANFORD CA 755 PM PDT THU AUG 30 2007 CAZ089>094-311300- WEST CENTRAL SAN JOAQUIN VALLEY-EAST CENTRAL SAN JOAQUIN VALLEY- SOUTHWESTERN SAN JOAQUIN VALLEY-SOUTHEASTERN SAN JOAQUIN VALLEY- MARIPOSA MADERA AND FRESNO COUNTY FOOTHILLS- TULARE COUNTY FOOTHILLS- 755 PM PDT THU AUG 30 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR FOR THE CENTRAL AND SOUTHERN SAN JOAQUIN VALLEY AND THE ADJACENT FOOTHILLS. .DAY ONE...TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY A HEAT ADVISORY CONTINUES FOR FRIDAY AND SATURDAY FROM 2 PM UNTIL 7 PM EACH DAY. PLEASE REFER TO THE LATEST WEATHER MESSAGE ISSUED BY THE NATIONAL WEATHER SERVICE OFFICE IN HANFORD AT /WWUS76 KHNX/ OR /SFONPWHNX/ FOR FURTHER DETAILS. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS TO THE SAN JOAQUIN VALLEY NATIONAL WEATHER SERVICE OFFICE. JDB WEATHER.GOV/HANFORD
The San Joaquin Valley radar (KHNX), 33 km away, was scanning. The volume nearest the first event began at 07:02 UTC.
2 lightning. Local standard time, as filed.
Strong thunderstorms and lightning brought a tree down on South Santa Fe Street in Visalia and caused power outages in Visalia and Dinuba. A sidewalk and wrought-iron fence were damaged in Visalia.
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, August 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: 59193, 59191.