Alert archive / California / Severe Thunderstorm Watches in 2005
Severe Thunderstorm Watch 25
The Storm Prediction Center issued this severe thunderstorm watch at Feb 21, 2005, 7:40 AM PST for 4 counties in California. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Feb 21, 2005, 7:40 AM PST (15:40 UTC)
- Expired
- Feb 21, 2005, 3:00 PM PST
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
Counties Los Angeles County, CA, Orange County, CA, San Diego County, CA, Ventura County, CA
The radar
The Santa Ana Mts radar (KSOX), 26 km from the middle of the area, began a volume at 15:44 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.
Warnings issued inside it
5 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 21, 7:45 AM PST | Flash Flood Warning | SGX | Riverside, San Bernardino, San Diego | 2 hr |
| Feb 21, 7:57 AM PST | Tornado Warning | SGX | Orange | 33 min |
| Feb 21, 8:54 AM PST | Flash Flood Warning | SGX | Orange | 66 min |
| Feb 21, 9:56 AM PST | Flash Flood Warning | SGX | Orange, Riverside, San Bernardino, San Diego | 3 hr |
| Feb 21, 12:34 PM PST | Flash Flood Warning | SGX | Orange, Riverside, San Bernardino, San Diego | 3 hr |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
San Diego, CA (KNKX), launched 12:00Z, 3.7 hours before the alert went out and 123 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
- 2 J/kg
- Mixed-layer CIN
- -9 J/kg
- Mixed-layer LCL
- 645 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 243 m²/s²
- 0-3 km storm-relative helicity
- 275 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 21, 2:10 AM PST | Mesoscale Discussion | SPC | Orange | 3 hr |
| Feb 21, 6:38 AM PST | Mesoscale Discussion | SPC | Los Angeles, Orange, San Diego, Ventura | 2 hr |
| Feb 21, 12:48 PM PST | Mesoscale Discussion | SPC | Los Angeles, Orange, Ventura | 87 min |
| Feb 21, 1:53 PM PST | Mesoscale Discussion | SPC | Alameda, Amador, Calaveras, Contra Costa, Fresno, Kings and 18 more | 2 hr |
| Feb 21, 3:30 PM PST | Severe Thunderstorm Watch | SPC | Amador, Calaveras, Fresno, Kern, Kings, Los Angeles and 11 more | 7 hr |
Nearby
Severe Thunderstorm Watches in California, 2005Every severe thunderstorm watch in 2005
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.