Alert archive / California / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 2, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this severe thunderstorm warning at Oct 10, 2012, 4:05 PM PDT for Santa Clara County, Santa Cruz County, California. It was in force for 25 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
- Oct 10, 2012, 4:05 PM PDT (23:05 UTC)
- Expired
- Oct 10, 2012, 4:30 PM PDT
- In force
- 25 min
- Issued by
- NWS San Francisco Bay Area, CA
- Area
- Storm-based polygon
Counties Santa Clara County, CA, Santa Cruz County, CA
The radar
The San Francisco radar (KMUX), 15 km from the middle of the area, began a volume at 23:06 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 12:00Z, 11.1 hours before the alert went out and 83 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
- 1 J/kg
- Mixed-layer CIN
- -332 J/kg
- Mixed-layer LCL
- 936 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 16 m²/s²
- 0-3 km storm-relative helicity
- 106 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
280 WUUS56 KMTR 102305 SVRMTR CAC085-087-102330- /O.NEW.KMTR.SV.W.0002.121010T2305Z-121010T2330Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SAN FRANCISCO CA 405 PM PDT WED OCT 10 2012 THE NATIONAL WEATHER SERVICE IN THE SAN FRANCISCO BAY AREA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SANTA CLARA COUNTY IN WESTERN CALIFORNIA... THIS INCLUDES THE CITY OF MORGAN HILL... SANTA CRUZ COUNTY IN WESTERN CALIFORNIA... * UNTIL 430 PM PDT * AT 401 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR MORGAN HILL...AND MOVING NORTHWEST AT 20 MPH. * OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO BROWN VALLEY ROAD...UVAS CANYON PARK AND EUREKA CANYON ROAD LAT...LON 3704 12188 3721 12178 3710 12159 3698 12166 TIME...MOT...LOC 2304Z 113DEG 17KT 3707 12171 $$ RILEY
1 follow-up statement
397 WWUS56 KMTR 102318 SVSMTR SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE SAN FRANCISCO CA 418 PM PDT WED OCT 10 2012 CAC085-087-102330- /O.CON.KMTR.SV.W.0002.000000T0000Z-121010T2330Z/ SANTA CRUZ CA-SANTA CLARA CA- 418 PM PDT WED OCT 10 2012 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM PDT FOR SANTA CLARA AND SANTA CRUZ COUNTIES... AT 414 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. STORM SPOTTER REPORTED QUARTER SIZE HAIL WITH THIS STORM. THIS STORM WAS LOCATED 7 MILES NORTH OF CORRALITOS...MOVING NORTHWEST AT 20 MPH. OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO EUREKA CANYON ROAD LAT...LON 3714 12170 3702 12174 3706 12187 3719 12179 TIME...MOT...LOC 2317Z 113DEG 17KT 3709 12178 $$ RILEY
The office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 10, 3:41 PM PDT | Special Weather Statement | MTR | Santa Clara | 34 min |
| Oct 10, 4:28 PM PDT | Severe Thunderstorm Warning | MTR | Santa Clara, Santa Cruz | 32 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.