Hail, Mariposa
- When
- July 10, 1:20 PM PST
- Where
- Mariposa County, 1.29 mi WSW of Yosemite Vlg
- Measured
- 0.88 in hail
- Reported by
- Park/Forest Service
- Coordinates
- 37.740, -119.600
Hail in California, July 10, 2007
An upper-level low developed off the central California coast on the 9th. Circulation around this low, combined with the flow around the upper-level ridge over the Desert Southwest, funneled some monsoonal moisture into the region from the south.
Where it happened
Every event with a place to put it. 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
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 HNX wrote it up.
An upper-level low developed off the central California coast on the 9th. Circulation around this low, combined with the flow around the upper-level ridge over the Desert Southwest, funneled some monsoonal moisture into the region from the south. The warm, moist airmass resulted in a severe thunderstorm that formed over the high country in Yosemite National Park. Hail ranging in size from 0.50 to just over 0.75 inch in diameter fell during a 5-minute period. The moist airmass also resulted in a few sprinkles over the central and southern San Joaquin Valley, with Bakersfield seeing its first (few) raindrops of the season on July 10th.
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 Hanford, CA wrote its last area forecast discussion before the first event at Jul 10, 12:08 PM PST, 1 hour 12 minutes earlier.
Area forecast discussion, Jul 10, 12:08 PM PST, 1 hour 12 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY - HANFORD CA 108 PM PDT TUE JUL 10 2007 .DISCUSSION...DRY LIGHTNING EVENT BEGAN JUST BEFORE NOON OVER THE HIGH SIERRA AND MOISTURE CONTINUES TO TAKE AIM ON CENTRAL CALIFORNIA. THUS FAR, EXTENSIVE CLOUD COVER HAS REALLY SQUELCHED THE DAY TIME HEATING AND IT LOOKS LIKE MOST LOWER ELEVATIONS WILL ONLY REACH INTO THE LOWER TO MID 90S THIS AFTERNOON. AGAIN THE MAIN FORECAST CONCERN IS THE CONTINUED THREAT OF DRY LIGHTNING FROM THUNDERSTORMS OVER THE VERY DRY MOUNTAINS OF INTERIOR CENTRAL CALIFORNIA. RADAR SHOWS INCREASING COVERAGE OF CELLS AND THIS WILL LIKELY CONTINUE THROUGH THE AFTERNOON INTO THIS EVENING AS THE DYNAMICS ARRIVE FROM THE SOUTH. AS OF 100 PM LIGHTNING DATA SHOWS CLOUD TO GROUND RATES OF 20 PER 5 MINUTES AND THIS DOES NOT BODE WELL FOR FIRE CONCERNS. SPEAKING OF DYNAMICS, WATER VAPOR IMAGERY SHOWS THE CENTER OF VORTICITY NOW MOVING INTO THE LA BASIN AND THIS IS VERY CLOSE TO THIS MORNINGS MODELS. CURRENT TRAJECTORY BRINGS THE VORT CENTER NORTH ACROSS CENTRAL CALIFORNIA THIS AFTERNOON AND EVENING AND THEN FINALLY INTO NORTHERN CALIFORNIA OVERNIGHT. AN ORGANIZED AREA OF THUNDERSTORMS WILL LIKELY DEVELOP OVER THE NEXT FEW HOURS AS AFTERNOON HEATING COMBINES WITH THE ARRIVING DYNAMICS. WILL KEEP THE CURRENT SCATTERED TO ISOLATED POPS INTACT FOR THE AFTERNOON PACKAGE, KEEPING THE CHANCES GOING OVERNIGHT. AS STATED THIS MORNING, FOR WEDNESDAY RESIDUAL MOISTURE WILL ALLOW FOR ANOTHER CHANCE OF THUNDERSTORMS OVER THE MOUNTAINS BEFORE A DRIER SOUTHWESTERLY FLOW TAKES OVER FOR WEDNESDAY NIGHT AND THURSDAY. ON FRIDAY NIGHT AND SATURDAY, THE GFS MODEL CONTINUES TO PROJECT ANOTHER VORTICITY CENTER MOVING UP FROM THE SOUTH HOWEVER THIS APPEARS TO BE MUCH WEAKER THAN THE CURRENT ONE AND MOISTURE LOOKS LIMITED. WILL NOT ADD POPS TO THE FORECAST GRIDS AT THIS TIME AS THIS NEEDS TO BE LOOKED AT THIS EVENING IN MORE DETAIL. FOR NOW, EMPHASIS WILL REMAIN ON THE SHORT TERM THUNDERSTORM DRY LIGHTNING SITUATION. && .AVIATION...VFR CONDITIONS WILL PREVAIL THROUGH 00Z THURSDAY. HOWEVER ISOLATED THUNDERSTORMS WILL BE POSSIBLE ACROSS TWEB ROUTES THROUGH MIDNIGHT TONIGHT. THUNDERSTORMS FOR THE MOST PART WILL BE HIGH BASED AND AND NO OBSTRUCTIONS TO VIS OR CIGS ARE EXPECTED. FOR SPECIFIC DETAILS...PLEASE REFER TO THE TAFS FOR KMCE...KFAT AND KBFL...AND TWEB ROUTES 421 AND 423. && .FIRE WEATHER...ISOLATED TO SCATTERED DRY THUNDERSTORMS WILL BE POSSIBLE IN THE SOUTHERN SIERRA NEVADA...AS WELL AS THE TEHACHAPI MOUNTAINS. A DEEPER MONSOON FLOW THAT WAS EXPECTED BY THIS AFTERNOON HAS BEEN DELAYED UNTIL LATER TONIGHT OR EARLY WED. THUS HAVE ISSUED RED FLAGS FOR THESE AREAS AND ALSO INCLUDED THE SIERRA FOOTHILLS UNTIL 5AM WED. .AIR QUALITY ISSUES... NONE && .HNX WATCHES/WARNINGS/ADVISORIES... RED FLAG WARNING UNTIL 5 AM PDT WEDNESDAY FOR CAZ293>297. && DUDLEY/BINGHAM WEATHER.GOV/HANFORD
Hazardous weather outlook, Jul 10, 8:04 AM PST, 5 hours 16 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY - HANFORD CA 904 AM PDT TUE JUL 10 2007 CAZ089>094-098-099-111615- 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-INDIAN WELLS VALLEY- SOUTHEASTERN KERN COUNTY DESERT- 904 AM PDT TUE JUL 10 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE CENTRAL SAN JOAQUIN VALLEY ADJACENT FOOTHILLS AND THE KERN COUNTY DESERT. .DAY ONE...TODAY AND TONIGHT THE THREAT OF THUNDERSTORMS HAS INCREASED DUE TO A SLOWLY MOVING UNSTABLE DISTURBANCE FROM THE SOUTH. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS TO THE SAN JOAQUIN VALLEY NATIONAL WEATHER SERVICE OFFICE. WEATHER.GOV/HANFORD CAZ095>097-111615- KERN COUNTY MOUNTAINS-SIERRA NEVADA FROM YOSEMITE TO KINGS CANYON- TULARE COUNTY MOUNTAINS- 904 AM PDT TUE JUL 10 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE KERN COUNTY MOUNTAINS AND THE HIGHER ELEVATIONS OF THE SOUTHERN SIERRA NEVADA. .DAY ONE...TODAY AND TONIGHT THUNDERSTORM ACTIVITY IN THE MOUNTAINS AND DESERT CAN BE EXPECTED DUE TO SLOW MOVING UNSTABLE SYSTEM MOVING OVER THE MOUNTAINS FROM THE SOUTH. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY A CONTINUED THREAT OF THUNDERSTORMS REMAINS FOR WEDNESDAY WHILE AN UNSTABLE SYSTEM MOVES THROUGH THE AREA OF THE MOUNTAINS. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS TO THE SAN JOAQUIN VALLEY NATIONAL WEATHER SERVICE OFFICE. WEATHER.GOV/HANFORD JONES
The radar
The San Joaquin Valley radar (KHNX), 159 km away, was scanning. The volume nearest the first event began at 21:20 UTC.
Event by event
1 hail. Local standard time, as filed.
What these are
- Hail
- Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Drought in Virginia, July 10 to 24, 2007
- Hail and Damaging Winds in Georgia, July 10, 2007
- Damaging Winds in Pennsylvania, July 10, 2007
- Flash Flooding and Flood in Texas, July 10 to 12, 2007
- Lightning Strikes in Delaware, July 10, 2007
- Flash Flood and Damaging Winds in Illinois, July 10, 2007
- Hail and Damaging Winds in Vermont, July 10, 2007
- Hail and Damaging Winds in Mississippi, July 10, 2007
- Damaging Winds in Michigan, July 10, 2007
- Hail and Damaging Winds in New York, July 10, 2007
- Damaging Winds in Michigan, July 10, 2007
- Tornado and Hail in Michigan, July 10, 2007
More
Every storm in California in 2007Every state in 2007This day in weather historyWarnings in California, July 2007
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: 51633.