Alert archive / California / Flash Flood Warnings in 2011
Flash Flood Warning 3, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this flash flood warning at Mar 24, 2011, 4:04 PM PDT for Santa Cruz County, California. It was in force for 56 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 24, 2011, 4:04 PM PDT (23:04 UTC)
- Expired
- Mar 24, 2011, 5:00 PM PDT
- In force
- 56 min
- Issued by
- NWS San Francisco Bay Area, CA
- Area
- Storm-based polygon
- Flood severity
- None
County Santa Cruz County, CA
The radar
The San Francisco radar (KMUX), 17 km from the middle of the area, began a volume at 23:06 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, 11.1 hours before the alert went out and 84 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
- 152 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 587 m above ground
- 0-6 km bulk shear
- 55 kt
- 0-1 km storm-relative helicity
- 121 m²/s²
- 0-3 km storm-relative helicity
- 154 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
620
WGUS56 KMTR 242304
FFWMTR
CAC087-250000-
/O.NEW.KMTR.FF.W.0003.110324T2304Z-110325T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
404 PM PDT THU MAR 24 2011
THE NATIONAL WEATHER SERVICE IN THE SAN FRANCISCO BAY AREA HAS
ISSUED A
* FLASH FLOOD WARNING FOR...
THE SOQUEL CREEK IN SANTA CRUZ COUNTY IN WESTERN CALIFORNIA...
* UNTIL 500 PM PDT.
* AT 355 PM PDT...NWS DOPPLER RADAR AND AUTOMATED RAIN GAGES
INDICATED HEAVY RAINFALL MOVING THROUGH THE AREA OVER THE LAST
TWO HOURS. THE SOQUEL CREEK AT SOQUEL IS NOW AT JUST UNDER
FLOOD STAGE OF 14.5 FEET AND IS EXPECTED TO REACH OR EXCEED FLOOD
STAGE WITHIN THE NEXT HOUR. RAINFALL IS EXPECTED TO TAPER OFF
WITHIN THE NEXT 30 MINUTES...BUT THE CREEK WILL CONTINUE TO RISE
EVEN AFTER RAIN RATES DECREASE.
* LOCATIONS IN THE WARNING INCLUDE COMMUNITIES AND INTERESTS ALONG
THE SOQUEL CREEK.
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 3713 12201 3708 12186 3695 12188 3695 12190
3697 12192 3697 12194 3695 12196 3695 12199
3695 12200
$$
DYKEMA1 follow-up statement
355
WGUS76 KMTR 250007
FFSMTR
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
507 PM PDT THU MAR 24 2011
CAC087-250012-
/O.EXP.KMTR.FF.W.0003.000000T0000Z-110325T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SANTA CRUZ CA-
507 PM PDT THU MAR 24 2011
...THE FLASH FLOOD WARNING HAS EXPIRED FOR THE SOQUEL CREEK IN SANTA
CRUZ COUNTY...
THE SOQUEL CREEK AT SOQUEL CRESTED ABOUT A HALF FOOT BELOW FLOOD
STAGE AT 4:30 PM PDT THIS AFTERNOON. THE CREEK HAS BEEN RECEDING
SINCE THAT TIME. THEREFORE...THE FLASH FLOOD WARNING FOR THE SOQUEL
CREEK IN SANTA CRUZ COUNTY HAS BEEN ALLOWED TO EXPIRE. SHOWERS WILL
CONTINUE ACROSS THE CREEK BASIN THROUGH THE EVENING HOURS...AND
BRIEF HEAVY DOWNPOURS ARE POSSIBLE. HOWEVER...FLOODING IS NO LONGER
EXPECTED ALONG THE SOQUEL CREEK.
LAT...LON 3713 12201 3708 12186 3695 12188 3695 12190
3697 12192 3697 12194 3695 12196 3695 12199
3695 12200
$$
DYKEMAThe office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 23, 10:27 PM PDT | Areal Flood Advisory | MTR | Monterey, San Benito, Santa Clara, Santa Cruz | 19 hr |
| Mar 24, 3:45 AM PDT | High Surf Advisory | MTR | Marin, Monterey, City and County of San Francisco, San Mateo, Santa Cruz, Sonoma | 20 hr |
| Mar 24, 12:06 PM PDT | Special Weather Statement | MTR | San Mateo | 39 min |
| Mar 24, 2:55 PM PDT | High Surf Warning | MTR | Marin, Monterey, City and County of San Francisco, San Mateo, Santa Cruz, Sonoma | 24 hr |
| Mar 24, 3:05 PM PDT | Small Craft Advisory | MTR | 42 hr | |
| Mar 24, 3:08 PM PDT | Flash Flood Warning | MTR | Santa Cruz | 3 hr |
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.