Alert archive / California / Severe Thunderstorm Warnings in 2010
Severe Thunderstorm Warning 1, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this severe thunderstorm warning at Jan 18, 2010, 11:02 AM PST for Santa Clara County, Santa Cruz County, California. It was in force for 43 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
- Jan 18, 2010, 11:02 AM PST (19:02 UTC)
- Expired
- Jan 18, 2010, 11:45 AM PST
- In force
- 43 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), 5 km from the middle of the area, began a volume at 19:02 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, 7.0 hours before the alert went out and 74 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
- 777 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 133 m²/s²
- 0-3 km storm-relative helicity
- 132 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 San Francisco Bay Area, CA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jan 18, 8:25 AM PST, 2 hours 37 minutes earlier.
Area forecast discussion, Jan 18, 8:25 AM PST, 2 hours 37 minutes before
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</html>Hazardous weather outlook, Jan 18, 4:45 AM PST, 6 hours 17 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA CA 445 AM PST MON JAN 18 2010 CAZ006-505-190000- SAN FRANCISCO- COASTAL NORTH BAY...INCLUDING POINT REYES NATIONAL SEASHORE- 445 AM PST MON JAN 18 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR COASTAL SECTIONS OF SONOMA AND MARIN COUNTIES AS WELL AS FOR SAN FRANCISCO COUNTY. .DAY ONE...MONDAY AND MONDAY NIGHT RAIN...WIND AND BUILDING SEAS WILL EFFECT THE COAST TODAY. A HIGH SURF ADVISORY AND WIND ADVISORY GO INTO EFFECT TODAY. IN ADDITION PERIODS OF RAIN...POSSIBLY HEAVY AT TIMES MAY CAUSE LOCAL FLOODING. * WIND ADVISORY.....SEE SFONPWMTR WWUS76 KMTR FOR DETAILS * * HIGH SURF ADVISORY....SEE SFOCFWMTR WHUS46 KMTR FOR DETAILS * * HYDROLOGIC OUTLOOK....SEE SFOESFMTR FGUS76 KMTR FOR DETAILS * .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY A SERIES OF POWERFUL WINTER STORMS WILL BRING PERIODS OF HEAVY RAIN...STRONG WINDS...AND LARGE OCEAN WAVES TO THE REGION FROM TUESDAY THROUGH THURSDAY. PERIODS OF HEAVY RAIN THIS WEEK MAY RESULT IN LOCAL FLOODING. VERY LARGE OCEAN SWELLS ARE FORECAST TO IMPACT THE COAST THROUGH THURSDAY. A HIGH SURF WARNING WILL GO INTO EFFECT AT 4 AM TUESDAY FOR SEAS IN EXCESS OF 20 FEET ALONG THE COAST. * HIGH SURF WARNING....SEE SFOCFWMTR WHUS46 KMTR FOR DETAILS * .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS PER STANDARD OPERATING PROCEDURES. CAZ509-529-530-190000- SAN FRANCISCO PENINSULA COAST- SOUTHERN MONTEREY BAY AND BIG SUR COAST-NORTHERN MONTEREY BAY- 445 AM PST MON JAN 18 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR COASTAL SECTIONS OF SAN MATEO...SANTA CRUZ...AND MONTEREY COUNTIES. .DAY ONE...MONDAY AND MONDAY NIGHT RAIN...WIND AND BUILDING SEAS WILL EFFECT THE COAST TODAY. A HIGH SURF ADVISORY AND HIGH WIND WARNING GO INTO EFFECT TODAY. IN ADDITION PERIODS OF RAIN...POSSIBLY HEAVY AT TIMES MAY CAUSE LOCAL FLOODING. * HIGH WIND WARNING.....SEE SFONPWMTR WWUS76 KMTR FOR DETAILS * * HIGH SURF ADVISORY....SEE SFOCFWMTR WHUS46 KMTR FOR DETAILS * * HYDROLOGIC OUTLOOK....SEE SFOESFMTR FGUS76 KMTR FOR DETAILS * .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY A SERIES OF POWERFUL WINTER STORMS WILL BRING PERIODS OF HEAVY RAIN...STRONG WINDS...AND LARGE OCEAN WAVES TO THE REGION FROM TUESDAY THROUGH THURSDAY. PERIODS OF HEAVY RAIN THIS WEEK MAY RESULT IN LOCAL FLOODING. VERY LARGE OCEAN SWELL ARE FORECAST TO IMPACT THE COAST THROUGH THURSDAY. A HIGH SURF WARNING GOES INTO EFFECT BEGINNING AT 4 AM TUESDAY FOR SEAS IN EXCESS OF 20 FEET. * HIGH SURF WARNING....SEE SFOCFWMTR WHUS46 KMTR FOR DETAILS * CAZ507-508-511>513-516>518-528-190000- SOUTHERN SALINAS VALLEY...ARROYO SECO...AND LAKE SAN ANTONIO- SANTA LUCIA MOUNTAINS AND LOS PADRES NATIONAL FOREST- MOUNTAINS OF SAN BENITO COUNTY AND INTERIOR MONTEREY COUNTY INCLUDING PINNACLES NATIONAL MONUMENT-NORTH BAY MOUNTAINS- SAN FRANCISCO BAY SHORELINE-EAST BAY HILLS AND THE DIABLO RANGE- NORTHERN SALINAS VALLEY...HOLLISTER VALLEY...AND CARMEL VALLEY- SANTA CRUZ MOUNTAINS-SANTA CLARA VALLEY...INCLUDING SAN JOSE- 445 AM PST MON JAN 18 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR INLAND SECTIONS OF THE SAN FRANCISCO BAY AREA AND MONTEREY BAY AREA...EXCEPT THE NORTH AND EAST BAY VALLEYS. .DAY ONE...MONDAY AND MONDAY NIGHT PERIODS OF RAIN AND STRONG WINDS WILL CONTINUE TODAY. A WIND ADVISORY IS IN EFFECT. LOCALIZED FLOODING WILL BE POSSIBLE DURING PERIODS OF HEAVY RAIN. * WIND ADVISORY.....SEE SFONPWMTR WWUS76 KMTR FOR DETAILS * * HYDROLOGIC OUTLOOK....SEE SFOESFMTR FGUS76 KMTR FOR DETAILS * .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY A SERIES OF POWERFUL WINTER STORMS WILL BRING PERIODS OF HEAVY RAIN AND STRONG WINDS TO THE REGION FROM TUESDAY THROUGH THURSDAY. PERIODS OF HEAVY RAIN THIS WEEK MANY RESULT IN LOCAL FLOODING. ADDITIONAL WIND ADVISORIES MAY BE NEEDED LATER THIS WEEK AS THE STORMS MOVE ONSHORE. DOWNED TREE LIMBS AND POWER OUTAGES WILL BE POSSIBLE THROUGH THURSDAY. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS PER STANDARD OPERATING PROCEDURES. CAZ506-510-190000- NORTH BAY INTERIOR VALLEYS-EAST BAY INTERIOR VALLEYS- 445 AM PST MON JAN 18 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE NORTH BAY VALLEYS AND THE EAST BAY VALLEYS. .DAY ONE...MONDAY AND MONDAY NIGHT PERIODS OF RAIN WILL CONTINUE TODAY INTO TONIGHT. LOCALIZED FLOODING WILL BE POSSIBLE DURING PERIODS OF HEAVY RAIN. LOCALLY STRONG WINDS ARE EXPECTED TODAY AS WELL WITH GUSTS BETWEEN 30 AND 40 MPH. * HYDROLOGIC OUTLOOK....SEE SFOESFMTR FGUS76 KMTR FOR DETAILS * .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY A SERIES OF POWERFUL WINTER STORMS WILL BRING PERIODS OF HEAVY RAIN AND STRONG WINDS TO THE REGION FROM TUESDAY THROUGH THURSDAY. PERIODS OF HEAVY RAIN THIS WEEK MAY RESULT IN LOCAL FLOODING. WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS PER STANDARD OPERATING PROCEDURES.
In the hours before
Special weather statement, Jan 18, 10:24 AM PST, 38 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
1024 AM PST MON JAN 18 2010
CAZ508>513-529-530-181915-
EAST BAY HILLS AND THE DIABLO RANGE CA-EAST BAY INTERIOR VALLEYS
CA-NORTHERN MONTEREY BAY CA-SAN FRANCISCO BAY SHORELINE CA-SAN
FRANCISCO PENINSULA COAST CA-SANTA CLARA VALLEY INCLUDING SAN JOSE
CA-SANTA CRUZ MOUNTAINS CA-SOUTHERN MONTEREY BAY AND BIG SUR COAST
CA-
1024 AM PST MON JAN 18 2010
...SIGNIFICANT WEATHER ADVISORY FOR MONTEREY...SANTA CRUZ...SAN
MATEO...SANTA CLARA AND ALAMEDA COUNTIES UNTIL 1115 AM PST...
AT 1020 AM PST...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM BOULDER CREEK TO
FELTON TO 8 MILES SOUTH OF TWIN LAKES TO 7 MILES NORTHWEST OF DEL
MONTE FOREST...AND MOVING NORTHEAST AT 40 MPH.
HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE
EXPECTED WITH THESE STORMS...ALONG WITH HEAVY RAIN.
AREAS AFFECTED BY THESE STORMS INCLUDE...SARATOGA...CUPERTINO...LOS
GATOS...LOS ALTOS...PALO ALTO...CAMPBELL...MOUNTAIN VIEW...
SUNNYVALE...SANTA CLARA...CORRALITOS...SAN JOSE...NEWARK...
MILPITAS...WATSONVILLE...FREMONT...MORGAN HILL...GILROY...
PLEASANTON...TWIN LAKES AND OPAL CLIFFS.
IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.
IN ADDITION...THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR
LOCAL RADIO AND TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR
ADDITIONAL INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL
WEATHER SERVICE.
LAT...LON 3747 12210 3746 12204 3750 12207 3773 12187
3746 12162 3730 12156 3697 12156 3678 12178
3682 12178 3695 12188 3696 12191 3694 12206
3698 12214 3724 12230
TIME...MOT...LOC 1824Z 219DEG 35KT 3718 12213 3704 12205
3687 12199 3666 12203
CWThe office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 17, 6:39 PM PST | High Surf Advisory | MTR | Marin, Monterey, City and County of San Francisco, San Mateo, Santa Cruz, Sonoma | 33 hr |
| Jan 17, 8:05 PM PST | High Wind Warning | MTR | Monterey, San Mateo, Santa Cruz | 19 hr |
| Jan 18, 2:46 AM PST | High Surf Warning | MTR | Marin, Monterey, City and County of San Francisco, San Mateo, Santa Cruz, Sonoma | 3 days |
| Jan 18, 3:00 AM PST | Gale Warning | MTR | 32 hr | |
| Jan 18, 9:40 AM PST | Areal Flood Advisory | MTR | Alameda, Contra Costa, Marin, Monterey, Napa, City and County of San Francisco and 4 more | 3 hr |
| Jan 18, 9:54 AM PST | Special Marine Warning | MTR | 21 min | |
| Jan 18, 10:06 AM PST | Special Marine Warning | MTR | 24 min | |
| Jan 18, 10:24 AM PST | Special Marine Warning | MTR | 30 min | |
| Jan 18, 10:24 AM PST | Special Weather Statement | MTR | Alameda, Santa Clara, Santa Cruz | 51 min |
| Jan 18, 11:35 AM PST | Special Weather Statement | MTR | 40 min | |
| Jan 18, 2:31 PM PST | Gale Warning | MTR | 25 hr | |
| Jan 18, 2:50 PM PST | Wind Advisory | MTR | Alameda, Contra Costa, Marin, Monterey, San Benito, City and County of San Francisco and 4 more | 22 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.