Alert archive / California / Severe Thunderstorm Warnings in 2010
Severe Thunderstorm Warning 4, NWS Sacramento, CA
NWS Sacramento, CA issued this severe thunderstorm warning at Jul 25, 2010, 4:21 PM PDT for Lassen County, Shasta County, California. It was in force for 24 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jul 25, 2010, 4:21 PM PDT (23:21 UTC)
- Expired
- Jul 25, 2010, 4:45 PM PDT
- In force
- 24 min
- Issued by
- NWS Sacramento, CA
- Area
- Storm-based polygon
Counties Lassen County, CA, Shasta County, CA
The radar
The Beale AFB radar (KBBX), 139 km from the middle of the area, began a volume at 23:24 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
Medford/Jackson, OR (KMFR), launched 12:00Z, 11.4 hours before the alert went out and 221 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
- 2152 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 1 m²/s²
- 0-3 km storm-relative helicity
- 70 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Jul 25, 4:00 PM PDT, 21 minutes earlier.
Area forecast discussion, Jul 25, 4:00 PM PDT, 21 minutes before
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</html>Hazardous weather outlook, Jul 25, 10:20 AM PDT, 6 hours 1 minute before
HAZARDOUS WEATHER OUTLOOK - UPDATED NATIONAL WEATHER SERVICE SACRAMENTO CA 1020 AM PDT SUN JUL 25 2010 CAZ013>019-063-064-066>069-261400- SHASTA LAKE AREA/NORTHERN SHASTA COUNTY- BURNEY BASIN/EASTERN SHASTA COUNTY-NORTHERN SACRAMENTO VALLEY- CENTRAL SACRAMENTO VALLEY-SOUTHERN SACRAMENTO VALLEY- CARQUINEZ STRAIT AND DELTA-NORTHERN SAN JOAQUIN VALLEY- MOUNTAINS SOUTHWESTERN SHASTA TO NORTHERN LAKE COUNTIES- CLEAR LAKE/SOUTHERN LAKE COUNTY-MOTHERLODE- EAST FOOTHILLS/NORTH SACRAMENTO VALLEY- WESTERN PLUMAS COUNTY/LASSEN PARK-WEST SLOPE NORTHERN SIERRA NEVADA- 700 AM PDT SUN JUL 25 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR INTERIOR NORTHERN CALIFORNIA. .DAY ONE...TODAY ISOLATED TO SCATTERED THUNDERSTORMS IN THE NORTHERN SACRAMENTO VALLEY...SIERRA FOOTHILLS AND OVER THE MOUNTAINS OF INTERIOR NORTHERN CALIFORNIA TODAY. THESE STORMS WILL LIKELY CONTINUE INTO THE NIGHTTIME HOURS. .DAYS TWO THROUGH SEVEN... MONDAY THROUGH SATURDAY ISOLATED TO SCATTERED THUNDERSTORMS IN THE NORTHERN SACRAMENTO VALLEY...SIERRA FOOTHILLS AND OVER THE MOUNTAINS OF INTERIOR NORTHERN CALIFORNIA CONTINUE THROUGH MONDAY. SOME MAY CONTAIN HEAVY RAINFALL. NO SIGNIFICANT WEATHER IS EXPECTED TUESDAY THOUGH SATURDAY. THE LATEST WEATHER INFORMATION IS AVAILABLE ON THE INTERNET AT (LOWER CASE): HTTP://WWW.WRH.NOAA.GOV/STO
The office that day
Everything else NWS Sacramento, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 25, 1:09 PM PDT | Red Flag Warning | STO | 11 hr |
Nearby
Severe Thunderstorm Warnings in California, 2010Every severe thunderstorm warning in 2010
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.