Alert archive / California / Mesoscale Discussions in 2005
Mesoscale Discussion 195
The Storm Prediction Center issued this mesoscale discussion at Feb 21, 2005, 1:53 PM PST for 24 counties in California. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Feb 21, 2005, 1:53 PM PST (21:53 UTC)
- Expired
- Feb 21, 2005, 4:00 PM PST
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 24 counties
Alameda County, CA, Amador County, CA, Calaveras County, CA, Contra Costa County, CA, Fresno County, CA, Kings County, CA, Madera County, CA, Marin County, CA, Mariposa County, CA, Merced County, CA, Monterey County, CA, Napa County, CA, Sacramento County, CA, San Benito County, CA, San Joaquin County, CA, San Luis Obispo County, CA, San Mateo County, CA, Santa Clara County, CA, Santa Cruz County, CA, Solano County, CA, Stanislaus County, CA, Sutter County, CA, Ventura County, CA, Yolo County, CA
The radar
The San Francisco radar (KMUX), 104 km from the middle of the area, began a volume at 21:54 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Oakland, CA (KOAK), launched 12:00Z, 9.9 hours before the alert went out and 164 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
- 892 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 199 m²/s²
- 0-3 km storm-relative helicity
- 235 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>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, 7:40 AM PST | Severe Thunderstorm Watch | SPC | Los Angeles, Orange, San Diego, Ventura | 7 hr |
| Feb 21, 12:48 PM PST | Mesoscale Discussion | SPC | Los Angeles, Orange, Ventura | 87 min |
| Feb 21, 3:30 PM PST | Severe Thunderstorm Watch | SPC | Amador, Calaveras, Fresno, Kern, Kings, Los Angeles and 11 more | 7 hr |
Nearby
Mesoscale Discussions in California, 2005Every mesoscale discussion 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.