Alert archive / California / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 10, NWS Hanford, CA

July 12, 2002Tuolumne County, California

NWS Hanford, CA issued this severe thunderstorm warning at Jul 12, 2002, 2:30 PM PDT for Tuolumne County, California. It was in force for 30 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 12, 2002, 2:30 PM PDT (21:30 UTC)
Expired: Jul 12, 2002, 3:00 PM PDT
In force: 30 min
Issued by: NWS Hanford, CA
Area: Counties, with a storm outline in the text

County Tuolumne County, CA

The nearest sounding before it

Reno, NV (KREV), launched 12:00Z, 9.5 hours before the alert went out and 229 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 109 J/kg
Mixed-layer CIN: -329 J/kg
Mixed-layer LCL: 3076 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: -25 m²/s²
0-3 km storm-relative helicity: 26 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, 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 this severe thunderstorm warning went out at Jul 12, 9:45 AM PDT, 4 hours 45 minutes earlier.

Area forecast discussion, Jul 12, 9:45 AM PDT, 4 hours 45 minutes before

INTERIOR CENTRAL CALIFORNIA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HANFORD CA
945 AM PDT FRI JUL 12 2002

HIGH PRESSURE HOLDING STRONG THIS MORNING ALLOWING A SOUTHEASTERLY
FLOW TO ADVECT MOISTURE INTO THE DISTRICT. AT THE MOMENT...SKIES
OVER THE DISTRICT ARE SUNNY WITH A FEW LINGERING CLOUDS OVER THE
NORTHERN PORTIONS FROM YESTERDAY/S EASTERLY WAVE. SATELLITE IMAGERY
SHOWS ANOTHER BATCH OF CLOUDS PUSHING UP FROM SOUTHERN ARIZONA AS
THE NEXT WAVE APPROACHES. TIMING OF THIS NEXT BATCH TO ENTER THE
DISTRICT WILL BE AROUND 4 PM. WILL EXPECT A REPEAT OF THURSDAY/S
WEATHER AS CLOUDS INCREASE BY LATE IN THE DAY AND MAX TEMPS
REACHING 100+ DEG OVER MUCH OF THE AREA. MODELS INSTABILITIES
SHOWING A SIMILAR CONDITION FROM THAT OF THURSDAY AS MAX CAPE VALUES
REMAIN OVER THE MOUNTAIN CREST. MODELS SHOWING MAX VALUES OF
1500-2000 J/KG...THEREFORE WILL EXPECT THE THUNDERSTORM THREAT TO
CONTINUE TODAY. IN ADDITION...MODELS SHOWING INVERTED-V
CHARACTERISTIC SOUNDINGS OVER MUCH OF THE DISTRICT...SO EXPECT
THUNDERSTORM ACTIVITY TO REMAIN DRY AND HAVE ISSUED A RED FLAG
WARNING FOR DRY LIGHTNING. ALSO...WILL CONTINUE THE HEAT ADVISORY AS
TODAY WILL BE ANOTHER HOT/MUGGY DAY.

.HNX...HEAT ADVISORY FOR THE CENTRAL AND SOUTHERN SAN JOAQUIN
       VALLEY...FOR THE FOOTHILLS OF THE SOUTHERN SIERRA NEVADA...
       AND FOR THE LOWER ELEVATIONS OF THE KERN COUNTY MOUNTAINS
       THROUGH TODAY.
    ...RED FLAG WARNING FOR THIS AFTERNOON AND EVENING FOR ZONES
       093-097.

MOLINA

Nearby

Severe Thunderstorm Warnings in California, 2002 Every severe thunderstorm warning in 2002

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.