Alert archive / California / Special Weather Statements in 2011
Special Weather Statement, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this special weather statement at Mar 18, 2011, 11:43 AM PDT for San Mateo County, California. It was in force for 47 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
- Mar 18, 2011, 11:43 AM PDT (18:43 UTC)
- Expired
- Mar 18, 2011, 12:30 PM PDT
- In force
- 47 min
- Issued by
- NWS San Francisco Bay Area, CA
County San Mateo County, CA
The radar
The San Francisco radar (KMUX), 37 km from the middle of the area, began a volume at 18:46 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, 6.7 hours before the alert went out and 37 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
- 21 J/kg
- Mixed-layer CIN
- -28 J/kg
- Mixed-layer LCL
- 757 m above ground
- 0-6 km bulk shear
- 68 kt
- 0-1 km storm-relative helicity
- 203 m²/s²
- 0-3 km storm-relative helicity
- 285 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>What forecasters said that day
The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS San Francisco Bay Area, CA wrote its last area forecast discussion before this special weather statement went out at Mar 18, 11:20 AM PDT, 23 minutes earlier.
Area forecast discussion, Mar 18, 11:20 AM PDT, 23 minutes before
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</html>Hazardous weather outlook, Mar 18, 4:18 AM PDT, 7 hours 25 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA 418 AM PDT FRI MAR 18 2011 CAZ006-505-509-529-530-191300- SAN FRANCISCO- COASTAL NORTH BAY...INCLUDING POINT REYES NATIONAL SEASHORE- SAN FRANCISCO PENINSULA COAST-NORTHERN MONTEREY BAY- SOUTHERN MONTEREY BAY AND BIG SUR COAST- 418 AM PDT FRI MAR 18 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SAN FRANCISCO BAY AREA AND MONTEREY BAY AREA. .DAY ONE...FRIDAY AND FRIDAY NIGHT A HIGH SURF ADVISORY REMAINS IN EFFECT FOR THE ENTIRE CALIFORNIA COASTLINE BEGINNING AT 3 PM. NORTHWEST SWELL OF 14 TO 17 FEET WILL COMBINE WITH 13 TO 15 SECOND PERIODS TO MAKE FOR HIGH SURF ALONG THE CALIFORNIA COAST. * HIGH SURF ADVISORY...SEE SFOCFWMTR WHUS46 KMTR FOR DETAILS * ALSO...A STORM SYSTEM WILL BRING A PERIOD OF HEAVY RAIN AND STRONG GUSTY WINDS TO THE AREA ON FRIDAY...ALONG WITH ISOLATED THUNDERSTORMS. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY THE HIGH SURF ADVISORY CONTINUES UNTIL 9 PM SATURDAY * HIGH SURF ADVISORY...SEE SFOCFWMTR WHUS46 KMTR FOR DETAILS * ANOTHER STORM IS FORECAST TO IMPACT THE AREA ON SUNDAY. THE STORM ON SUNDAY WILL BE STRONGER AND WETTER THAN THE FRIDAY SYSTEM. THE SUNDAY STORM HAS THE POTENTIAL TO PRODUCE STRONG DAMAGING WINDS AS WELL AS HEAVY RAIN THAT MAY LEAD TO FLOODING AND MUDSLIDES. AN ACTIVE WEATHER PATTERN WILL CONTINUE INTO NEXT WEEK WITH ANOTHER STORM POSSIBLE ON WEDNESDAY. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS PER STANDARD OPERATING PROCEDURES. CAZ506>508-510>513-516>518-528-191300- NORTH BAY INTERIOR VALLEYS-NORTH BAY MOUNTAINS- SAN FRANCISCO BAY SHORELINE-EAST BAY INTERIOR VALLEYS- EAST BAY HILLS AND DIABLO RANGE-SANTA CRUZ MOUNTAINS- SANTA CLARA VALLEY...INCLUDING SAN JOSE- SOUTHERN SALINAS VALLEY...ARROYO SECO...AND LAKE SAN ANTONIO- SANTA LUCIA MOUNTAINS AND LOS PADRES NATIONAL FOREST- MOUNTAINS OF SAN BENITO AND INTERIOR MONTEREY COUNTY INCLUDING PINNACLES NATIONAL MONUMENT- NORTHERN SALINAS VALLEY...HOLLISTER VALLEY...AND CARMEL VALLEY- 418 AM PDT FRI MAR 18 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SAN FRANCISCO BAY AREA AND MONTEREY BAY AREA. .DAY ONE...FRIDAY AND FRIDAY NIGHT A STORM SYSTEM WILL BRING A PERIOD OF HEAVY RAIN AND STRONG GUSTY WINDS TO THE AREA ON FRIDAY...ALONG WITH ISOLATED THUNDERSTORMS. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY ANOTHER STORM IS FORECAST TO IMPACT THE AREA ON SUNDAY. THE STORM ON SUNDAY WILL BE STRONGER AND WETTER THAN THE FRIDAY SYSTEM. THE SUNDAY STORM HAS THE POTENTIAL TO PRODUCE STRONG DAMAGING WINDS AS WELL AS HEAVY RAIN THAT MAY LEAD TO FLOODING AND MUDSLIDES. AN ACTIVE WEATHER PATTERN WILL CONTINUE INTO NEXT WEEK WITH ANOTHER STORM POSSIBLE ON WEDNESDAY. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS PER STANDARD OPERATING PROCEDURES.
In the hours before
Special weather statement, Mar 18, 10:07 AM PDT, 1 hour 36 minutes before
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</html>The office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 18, 9:49 AM PDT | High Wind Watch | MTR | Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 5 more | 28 hr |
| Mar 18, 11:02 AM PDT | Tornado Warning | MTR | San Mateo | 28 min |
Nearby
Special Weather Statements in California, 2011Every special weather statement in 2011
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.