Alert archive / California / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 2, NWS Sacramento, CA
NWS Sacramento, CA issued this severe thunderstorm warning at Apr 12, 2012, 5:53 PM PDT for Calaveras County, San Joaquin County, Stanislaus County, California. It was in force for 34 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
- Apr 12, 2012, 5:53 PM PDT (00:53 UTC)
- Expired
- Apr 12, 2012, 6:27 PM PDT
- In force
- 34 min
- Issued by
- NWS Sacramento, CA
- Area
- Storm-based polygon
Counties Calaveras County, CA, San Joaquin County, CA, Stanislaus County, CA
The radar
The Sacramento radar (KDAX), 90 km from the middle of the area, began a volume at 00:55 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.
The nearest sounding before it
Oakland, CA (KOAK), launched 00:00Z, 0.9 hours before the alert went out and 126 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1716 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- -21 m²/s²
- 0-3 km storm-relative helicity
- 37 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
400 WUUS56 KSTO 130053 SVRSTO CAC009-077-099-130130- /O.NEW.KSTO.SV.W.0002.120413T0053Z-120413T0130Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SACRAMENTO CA 553 PM PDT THU APR 12 2012 THE NATIONAL WEATHER SERVICE IN SACRAMENTO HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHWESTERN CALAVERAS COUNTY IN CENTRAL CALIFORNIA... EXTREME EAST CENTRAL SAN JOAQUIN COUNTY IN CENTRAL CALIFORNIA... NORTH CENTRAL STANISLAUS COUNTY IN CENTRAL CALIFORNIA... * UNTIL 630 PM PDT * AT 548 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. THIS STORM WAS LOCATED NEAR MILTON...OR 5 MILES NORTH OF EUGENE...AND MOVING NORTHEAST AT 20 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... HODSON BY 600 PM PDT... COPPEROPOLIS BY 605 PM PDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM. WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM. && LAT...LON 3821 12094 3804 12053 3787 12078 3793 12092 TIME...MOT...LOC 0051Z 223DEG 18KT 3799 12077 $$ PCH
2 follow-up statements
006 WWUS56 KSTO 130118 SVSSTO SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE SACRAMENTO CA 618 PM PDT THU APR 12 2012 CAC077-099-130128- /O.CAN.KSTO.SV.W.0002.000000T0000Z-120413T0130Z/ STANISLAUS CA-SAN JOAQUIN CA- 618 PM PDT THU APR 12 2012 ...THE SEVERE THUNDERSTORM WARNING FOR EXTREME EAST CENTRAL SAN JOAQUIN AND NORTH CENTRAL STANISLAUS COUNTIES IS CANCELLED... LAT...LON 3797 12068 3804 12084 3817 12085 3804 12054 TIME...MOT...LOC 0118Z 223DEG 18KT 3809 12065 $$ CAC009-130130- /O.CON.KSTO.SV.W.0002.000000T0000Z-120413T0130Z/ CALAVERAS CA- 618 PM PDT THU APR 12 2012 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM PDT FOR CENTRAL CALAVERAS COUNTY... AT 612 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL. THIS STORM WAS LOCATED NEAR HODSON...OR 8 MILES SOUTH OF SAN ANDREAS...MOVING NORTHEAST AT 20 MPH. LAT...LON 3797 12068 3804 12084 3817 12085 3804 12054 TIME...MOT...LOC 0118Z 223DEG 18KT 3809 12065 $$ PCH
919 WWUS56 KSTO 130127 SVSSTO SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE SACRAMENTO CA 627 PM PDT THU APR 12 2012 CAC009-130131- /O.CAN.KSTO.SV.W.0002.000000T0000Z-120413T0130Z/ CALAVERAS CA- 627 PM PDT THU APR 12 2012 ...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL CALAVERAS COUNTY IS CANCELLED... THE STORM HAS WEAKENED AND THUS THE SEVERE THUNDERSTORM WARNING IS NO LONGER IN EFFECT. THIS STORM IS STILL CAPABLE OF PRODUCING SIGNIFICANT AMOUNTS OF PEA SIZED HAIL...HEAVY RAIN...AND GUSTY WINDS THROUGH 7 PM. THE STORM IS CURRENTLY NEAR SAN ANDREAS AND MOVING NORTHEAST AT AROUND 20 MPH. LAT...LON 3797 12068 3804 12084 3817 12085 3804 12054 TIME...MOT...LOC 0121Z 223DEG 18KT 3810 12064 $$ PCH
The office that day
Everything else NWS Sacramento, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 12, 5:18 PM PDT | Special Weather Statement | STO | San Joaquin | 42 min |
| Apr 12, 5:31 PM PDT | Severe Thunderstorm Warning | STO | Amador, Calaveras, Sacramento, San Joaquin | 43 min |
| Apr 12, 5:42 PM PDT | Special Weather Statement | STO | Sacramento | 48 min |
| Apr 13, 9:11 AM PDT | Areal Flood Advisory | STO | Amador, Butte, Calaveras, El Dorado, Nevada, Placer and 7 more | 4 hr |
| Apr 13, 2:08 PM PDT | Special Weather Statement | STO | San Joaquin | 42 min |
| Apr 13, 2:26 PM PDT | Special Weather Statement | STO | San Joaquin | 49 min |
| Apr 13, 3:19 PM PDT | Special Weather Statement | STO | Sacramento | 41 min |
Nearby
Severe Thunderstorm Warnings in California, 2012Every severe thunderstorm warning in 2012
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.