Alert archive / California / Flash Flood Warnings in 2011
Flash Flood Warning 6, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this flash flood warning at Sep 10, 2011, 4:41 PM PDT for San Benito County, California. It was in force for 34 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
- Sep 10, 2011, 4:41 PM PDT (23:41 UTC)
- Expired
- Sep 10, 2011, 5:15 PM PDT
- In force
- 34 min
- Issued by
- NWS San Francisco Bay Area, CA
- Area
- Storm-based polygon
- Flood severity
- None
County San Benito County, CA
The radar
The San Francisco radar (KMUX), 108 km from the middle of the area, began a volume at 23:44 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.
The nearest sounding before it
Oakland, CA (KOAK), launched 12:00Z, 11.7 hours before the alert went out and 175 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
- 91 J/kg
- Mixed-layer CIN
- -887 J/kg
- Mixed-layer LCL
- 2154 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 41 m²/s²
- 0-3 km storm-relative helicity
- 33 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
313 WGUS56 KMTR 102341 FFWMTR CAC069-110015- /O.NEW.KMTR.FF.W.0006.110910T2341Z-110911T0015Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE SAN FRANCISCO CA 441 PM PDT SAT SEP 10 2011 THE NATIONAL WEATHER SERVICE IN THE SAN FRANCISCO BAY AREA HAS ISSUED A * FLASH FLOOD WARNING FOR... SAN BENITO COUNTY IN WESTERN CALIFORNIA... * UNTIL 515 PM PDT. * AT 432 PM PDT...NWS DOPPLER RADAR AND AUTOMATED RAIN GAGES INDICATED... FROM A THUNDERSTORM 9 MILES EAST OF PINNACLES RAWS... OR 27 MILES NORTHEAST OF ARROYO SECO...MOVING WEST AT 5 MPH. * THE STORM PRODUCING HEAVY RAIN WILL MOVE ACROSS HIGHWAY 25 SOUTH OF PINNACLES NATIONAL MONUMENT AND WILL RESULT IN LOCALIZED PONDING ON THE ROADWAYS AND FLOODING OF PREVIOUSLY DRY GULCHES. OTHERWISE THE STORM WILL REMAIN OVER MAINLY RURAL AREAS OF THE SAN BENITO COUNTY. A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS IMMINENT. RUNOFF FROM HEAVY RAINFALL WILL CAUSE LOCALIZED FLOODING OF SMALL CREEKS AND STREAMS AS WELL AS ROADWAYS...UNDERPASSES AND OTHER LOW LYING SPOTS. DO NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATER OR WATER OF UNKNOWN DEPTH. TURN AROUND...DONT DROWN. IT IS IMPORTANT FOR CAMPERS AND HIKERS TO KNOW WHERE THEY ARE RELATIVE TO CREEKS...STREAMS...OR RIVERS WHICH CAN BECOME DANGEROUS IN HEAVY RAINS. BE PARTICULARLY AWARE IN HILLY TERRAIN WHERE MANY LOW WATER CROSSINGS CAN QUICKLY BECOME KILLERS. BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING. TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE. LAT...LON 3648 12120 3652 12092 3639 12090 3636 12109 $$ LARRY
2 follow-up statements
280 WGUS76 KMTR 110004 FFSMTR FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SAN FRANCISCO CA 504 PM PDT SAT SEP 10 2011 CAC069-110015- /O.CON.KMTR.FF.W.0006.000000T0000Z-110911T0015Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SAN BENITO CA- 504 PM PDT SAT SEP 10 2011 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 515 PM PDT FOR SAN BENITO COUNTY... AT 457 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A THUNDERSTORM PRODUCING FLASH FLOODING. THIS STORM WAS LOCATED 6 MILES SOUTHEAST OF PINNACLES RAWS...OR 24 MILES NORTHEAST OF ARROYO SECO...MOVING SOUTHWEST AT 5 MPH. THIS THUNDERSTORM WITH EXCESSIVE RAIN IS SLOWLY MOVING ACROSS HIGH WAY 25 BUT WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS OF THE INDICATED COUNTY. PRECAUTIONARY/PREPAREDNESS ACTIONS... EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS. MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN. FLOODING IS OCCURRING OR IS IMMINENT. IT IS IMPORTANT TO KNOW WHERE YOU ARE RELATIVE TO STREAMS...RIVERS...OR CREEKS WHICH CAN BECOME KILLERS IN HEAVY RAINS. CAMPERS AND HIKERS SHOULD AVOID STREAMS OR CREEKS. && LAT...LON 3648 12120 3652 12092 3639 12090 3636 12109 $$ LARRY
081 WGUS76 KMTR 110019 FFSMTR FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SAN FRANCISCO CA 519 PM PDT SAT SEP 10 2011 CAC069-110029- /O.EXP.KMTR.FF.W.0006.000000T0000Z-110911T0015Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SAN BENITO CA- 519 PM PDT SAT SEP 10 2011 ...THE FLASH FLOOD WARNING HAS EXPIRED FOR SAN BENITO COUNTY... LAT...LON 3648 12120 3652 12092 3639 12090 3636 12109 $$ LARRY
The office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 10, 7:43 AM PDT | Small Craft Advisory | MTR | 15 hr | |
| Sep 10, 4:22 PM PDT | Special Weather Statement | MTR | San Benito | 23 min |
Nearby
Flash Flood Warnings in California, 2011Every flash flood warning 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.