Alert archive / California / Flash Flood Warnings in 2011
Flash Flood Warning 27, NWS San Diego, CA
NWS San Diego, CA issued this flash flood warning at Sep 10, 2011, 6:44 PM PDT for San Bernardino County, California. It was in force for 2 hr. 2 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Sep 10, 2011, 6:44 PM PDT (01:44 UTC)
- Expired
- Sep 10, 2011, 8:45 PM PDT
- In force
- 2 hr
- Issued by
- NWS San Diego, CA
- Area
- Storm-based polygon
- Flood severity
- None
County San Bernardino County, CA
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 10, 7:12 PM PDT | FLASH FLOOD | Lucerne Valley, CA | 4 TO 5 INCHES OF STANDING WATER ON HIGHWAY 18 BETWEEN DEAD MANS POINT AND HIGHWAY 247. MULTIPLE VEHICLES STALLED DUE TO WATER INTAKE. |
| Sep 10, 7:20 PM PDT | FLASH FLOOD | 2 E Apple Valley, CA | HIGHWAY 18 CLOSED AT BEAR VALLEY ROAD JUST EAST OF APPLE VALLEY DUE TO 1-2 FEET OF WATER ON THE ROADWAY BETWEEN HIGH ROAD AND MILE MARKER 80. NUMEROUS VEHICLES STALLED DUE TO WATER INTAKE. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
San Diego, CA (KNKX), launched 00:00Z, 1.7 hours before the alert went out and 191 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
- 972 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 65 m²/s²
- 0-3 km storm-relative helicity
- 60 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
190
WGUS56 KSGX 110144
FFWSGX
CAC071-110345-
/O.NEW.KSGX.FF.W.0027.110911T0144Z-110911T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN DIEGO CA
644 PM PDT SAT SEP 10 2011
THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A
* FLASH FLOOD WARNING FOR...
WEST CENTRAL SAN BERNARDINO COUNTY IN SOUTHERN CALIFORNIA...
THIS INCLUDES THE CITIES OF...VICTORVILLE...HESPERIA...APPLE
VALLEY...
* UNTIL 845 PM PDT
* AT 636 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR AND LAW
ENFORCEMENT INDICATED FLASH FLOODING FROM A STORM OVER THE WARNED
AREA.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ORO GRANDE
LUCERNE VALLEY...APPLE VALLEY...HESPERIA...AND VICTORVILLE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.
A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.
&&
LAT...LON 3453 11735 3470 11733 3471 11712 3468 11687
3434 11689 3433 11710 3435 11730
$$
SS2 follow-up statements
702
WGUS76 KSGX 110236
FFSSGX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
736 PM PDT SAT SEP 10 2011
CAC071-110345-
/O.CON.KSGX.FF.W.0027.000000T0000Z-110911T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
736 PM PDT SAT SEP 10 2011
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 PM PDT FOR WEST
CENTRAL SAN BERNARDINO COUNTY...
AT 724 PM PDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED HEAVY RAIN
PRODUCING FLASH FLOODING OVER THE WARNED AREA.
CALIFORNIA HIGHWAY PATROL REPORTED FLOODING ALONG HIGHWAY 18 IN
LUCERNE VALLEY. THERE WAS 1-2 FEET OF WATER ON THE HIGHWAY BETWEEN
HIGH ROAD AND MILE MARKER 80. OTHER INTERSECTIONS IN LUCERNE VALLEY
WERE ALSO FLOODED. THERE WAS ALSO A SPOTTER REPORT OF A FLOODED HOME
IN LUCERNE VALLEY.
WHILE THESE STORMS HAVE WEAKENED SIGNIFICANTLY...CONTINUED RAINFALL
ON ALREADY SATURATED GROUND WILL PRODUCE ADDITIONAL RUNOFF OVER THE
AREA...WITH WATER GRADUALLY FLOWING WEST TOWARDS APPLE
VALLEY...HESPERIA...AND VICTORVILLE. EVEN AFTER THE RAIN
ENDS...ROADS THAT ARE ALREADY FLOODED WILL CONTINUE TO POSE A THREAT
TO MOTORISTS.
LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
VICTORVILLE...HESPERIA...APPLE VALLEY...AND LUCERNE VALLEY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.
A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.
&&
LAT...LON 3453 11735 3470 11733 3471 11712 3468 11687
3434 11689 3433 11710 3435 11730
$$
SS328
WGUS76 KSGX 110339
FFSSGX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN DIEGO CA
839 PM PDT SAT SEP 10 2011
CAC071-110348-
/O.EXP.KSGX.FF.W.0027.000000T0000Z-110911T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO CA-
839 PM PDT SAT SEP 10 2011
...THE FLASH FLOOD WARNING WILL EXPIRE AT 845 PM PDT FOR WEST CENTRAL
SAN BERNARDINO COUNTY...
RAINFALL IN THE AREA HAS DISSIPATED AND THE THREAT OF FLASH FLOODING
HAS ENDED...THEREFORE THE FLASH FLOOD WARNING WILL BE ALLOWED TO
EXPIRE AT 845 PM.
LAT...LON 3453 11735 3470 11733 3471 11712 3468 11687
3434 11689 3433 11710 3435 11730
$$
SSThe office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 10, 5:33 PM PDT | Special Weather Statement | SGX | 57 min | |
| Sep 10, 5:37 PM PDT | Special Weather Statement | SGX | 83 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.