Alert archive / California / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 2, NWS Sacramento, CA
NWS Sacramento, CA issued this severe thunderstorm warning at Mar 7, 2002, 1:45 PM PST for Calaveras County, Stanislaus County, California. It was in force for 45 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Mar 7, 2002, 1:45 PM PST (21:45 UTC)
- Expired
- Mar 7, 2002, 2:30 PM PST
- In force
- 45 min
- Issued by
- NWS Sacramento, CA
- Area
- Counties, with a storm outline in the text
Counties Calaveras County, CA, Stanislaus County, CA
The radar
The Sacramento radar (KDAX), 92 km from the middle of the area, began a volume at 21:49 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
Did it verify
Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The nearest sounding before it
Oakland, CA (KOAK), launched 12:00Z, 9.8 hours before the alert went out and 132 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.
- Mixed-layer CAPE
- 72 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 684 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 43 m²/s²
- 0-3 km storm-relative helicity
- 111 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS56 KSTO 072151 SVRSAC CAC009-099-072230- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING...CORRECTED NATIONAL WEATHER SERVICE SACRAMENTO CA 144 PM PST THU MAR 7 2002 THE NATIONAL WEATHER SERVICE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... WESTERN CALAVERAS COUNTY IN CALIFORNIA NORTHEASTERN STANISLAUS COUNTY IN CALIFORNIA * VALID UNTIL 230 PM PST * AT 131 PM PST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 6 MILES SOUTHWEST OF MILTON...MOVING NORTHEAST AT 30 MPH. * SOME LOCATIONS AFFECTED BY THIS WARNING INCLUDE... HODSON MILTON MURPHYS IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER FROM THE WEATHER IN A STRONG BUILDING. DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN...AND DEADLY LIGHTNING ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS. STAY INSIDE AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED. REPORT SIGNIFICANT WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE. LAT...LON 3802 12098 3789 12082 3817 12042 3833 12062
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 Sacramento, CA wrote its last area forecast discussion before this severe thunderstorm warning went out at Mar 7, 8:45 AM PST, 5 hours earlier.
Area forecast discussion, Mar 7, 8:45 AM PST, 5 hours before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
845 AM PST THU MAR 7 2002
MODERATE SNOW IS BEING REPORTED AT BLUE CANYON WITH OTHER REPORTING
STATIONS INDICATING LIGHT RAIN...ALTHOUGH RADAR INDICATES SOME
EMBEDDED PATCHES OF MODERATE PRECIPITATION...MAINLY IN THE FOOTHILLS
AND COASTAL HILLS SOUTH OF THE BAY AREA. EXPECT CONTINUED DEVELOPMENT
THIS MORNING...TAPERING OFF AND BECOMING CONVECTIVE THIS AFTERNOON.
RADAR IS ONLY INDICATING LIMITED RETURNS IN THE COLD AIR OFFSHORE
ALTHOUGH THE CLOUD FIELD IN IR SAT PIX SUGGEST ENOUGH MOISTURE TO
TRIGGER SHOWERS AFTER FRONTAL PASSAGE. THUNDERSTORMS A POSSIBILITY
AGAIN TODAY AS THE AIRMASS BECOMES LESS STABLE. GRIDDED MODEL DATA
DELAYED DUE TO COMMUNICATION PROBLEMS AT GATEWAY. PLAN TO UPDATE
ZONES LATER THIS MORNING AS PRECIPITATION DIMINISHES. NO CHANGE TO
WARNINGS OR ADVISORIES AT THIS TIME. SOUTHERLY SURFACE WINDS HAVE
INCREASED THIS MORNING BUT STILL BELOW ADVISORY CRITERIA.
.STO...WINTER STORM WARNING FOR THE WEST SLOPE OF THE NORTHERN SIERRA
NEVADA TODAY...
WINTER STORM WARNING FOR WESTERN PLUMAS COUNTY TODAY THROUGH
THURSDAY MORNING.
SNOW ADVISORY TODAY FOR THE SHASTA COUNTY MOUNTAINS AND
PORTIONS OF THE COASTAL RANGE.The office that day
Everything else NWS Sacramento, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 6, 4:16 PM PST | Severe Thunderstorm Warning | STO | Tehama | 29 min |
| Mar 7, 1:51 PM PST | Severe Thunderstorm Warning | STO | Calaveras, Stanislaus | 39 min |
| Mar 7, 2:36 PM PST | Severe Thunderstorm Warning | STO | Calaveras, Stanislaus, Tuolumne | 39 min |
Nearby
Severe Thunderstorm Warnings in California, 2002Every 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; radar from the NEXRAD Level II archive.