Alert archive / California / Flash Flood Warnings in 2012
Flash Flood Warning 24, NWS San Diego, CA
NWS San Diego, CA issued this flash flood warning at Aug 17, 2012, 1:07 PM PDT for Riverside County, San Bernardino County, California. It was in force for 3 hr. 1 report 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
- Aug 17, 2012, 1:07 PM PDT (20:07 UTC)
- Expired
- Aug 17, 2012, 4:30 PM PDT
- In force
- 3 hr
- Issued by
- NWS San Diego, CA
- Area
- Storm-based polygon
- Flood severity
- None
The radar
The Santa Ana Mts radar (KSOX), 67 km from the middle of the area, began a volume at 20:07 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 17, 2:16 PM PDT | FLOOD | Forest Falls, CA | MILL CREEK TRIBUTARY...RATTLESNAKE CREEK...IS AT FLOOD STAGE. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Edwards AFB, CA (KEDW), launched 12:00Z, 8.1 hours before the alert went out and 122 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
- 3028 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- -3 m²/s²
- 0-3 km storm-relative helicity
- 92 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
279 WGUS56 KSGX 172007 FFWSGX CAC065-071-172130- /O.NEW.KSGX.FF.W.0024.120817T2007Z-120817T2130Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE SAN DIEGO CA 107 PM PDT FRI AUG 17 2012 THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A * FLASH FLOOD WARNING FOR... NORTHWESTERN RIVERSIDE COUNTY IN SOUTHERN CALIFORNIA... SOUTHWESTERN SAN BERNARDINO COUNTY IN SOUTHERN CALIFORNIA...THIS INCLUDES THE CITIES OF YUCAIPA AND CALIMESA... * UNTIL 230 PM PDT * AT 1258 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED FLASH FLOODING FROM A STORM OVER THE WARNED AREA. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO FOREST FALLS...OAK GLEN...AND EASTERN PARTS OF YUCAIPA AND CALIMESA. 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. 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. && LAT...LON 3410 11701 3411 11683 3396 11688 3397 11708 $$ MM
5 follow-up statements
267 WGUS76 KSGX 172043 FFSSGX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SAN DIEGO CA 143 PM PDT FRI AUG 17 2012 CAC065-071-172130- /O.CON.KSGX.FF.W.0024.000000T0000Z-120817T2130Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ RIVERSIDE CA-SAN BERNARDINO CA- 143 PM PDT FRI AUG 17 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 230 PM PDT FOR SOUTHWESTERN SAN BERNARDINO AND NORTHWESTERN RIVERSIDE COUNTIES... AT 137 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE HEAVY RAIN PRODUCING FLASH FLOODING OVER THE WARNED AREA. LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO FOREST FALLS...OAK GROVE...AND EASTERN PORTIONS OF YUCAIPA AND CALIMESA. LAT...LON 3410 11701 3411 11683 3396 11688 3397 11708 $$ MM
295 WGUS76 KSGX 172100 FFSSGX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SAN DIEGO CA 200 PM PDT FRI AUG 17 2012 CAC065-071-172130- /O.CON.KSGX.FF.W.0024.000000T0000Z-120817T2130Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ RIVERSIDE CA-SAN BERNARDINO CA- 200 PM PDT FRI AUG 17 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 230 PM PDT FOR SOUTHWESTERN SAN BERNARDINO AND NORTHWESTERN RIVERSIDE COUNTIES... AT 150 PM PDT...TRAINED WEATHER SPOTTERS REPORTED HEAVY RAIN PRODUCING FLASH FLOODING OVER THE WARNED AREA IN THE MILL CREEK DRAINAGE. TRAVEL ON VALLEY OF THE FALLS DRIVE IS NOT POSSIBLE. LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO FOREST FALLS...OAK GLEN...YUCAIPA AND CALIMESA. PRECAUTIONARY/PREPAREDNESS ACTIONS... FLOOD WATERS ARE MOVING DOWN MILL CREEK. 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. DO NOT UNDERESTIMATE THE POWER OF FLOOD WATERS. ONLY A FEW INCHES OF RAPIDLY FLOWING WATER CAN QUICKLY CARRY AWAY YOUR VEHICLE. && LAT...LON 3410 11701 3411 11683 3396 11688 3397 11708 $$ MM
009 WGUS56 KSGX 172126 FFWSGX CAC065-071-172330- /O.EXT.KSGX.FF.W.0024.000000T0000Z-120817T2330Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE SAN DIEGO CA 226 PM PDT FRI AUG 17 2012 THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS EXTENDED THE * FLASH FLOOD WARNING FOR... NORTHWESTERN RIVERSIDE COUNTY IN SOUTHERN CALIFORNIA... SOUTHWESTERN SAN BERNARDINO COUNTY IN SOUTHERN CALIFORNIA... THIS INCLUDES THE CITY OF YUCAIPA... * UNTIL 430 PM PDT. * AT 218 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUES TO INDICATE HEAVY RAINFALL OVER THE FOREST FALLS AND YUCAIPA AND SURROUNDING AREAS. ALSO...A TRAINED WEATHER SPOTTER REPORTED FLOODING OF MILL CREEK WITH BOULDERS AND DEBRIS FLOWING ACROSS THE VALLEY OF THE FALLS. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO FOREST FALLS. PRECAUTIONARY/PREPAREDNESS ACTIONS... DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. MOVE TO HIGHER GROUND. A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING. IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY. RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY AUTOMOBILE. && LAT...LON 3410 11701 3411 11683 3396 11688 3397 11708 $$ HARRISON
392 WGUS76 KSGX 172225 FFSSGX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SAN DIEGO CA 325 PM PDT FRI AUG 17 2012 CAC065-071-172330- /O.CON.KSGX.FF.W.0024.000000T0000Z-120817T2330Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ RIVERSIDE CA-SAN BERNARDINO CA- 325 PM PDT FRI AUG 17 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 430 PM PDT FOR SOUTHWESTERN SAN BERNARDINO AND NORTHWESTERN RIVERSIDE COUNTIES... AT 315 PM PDT...TRAINED WEATHER SPOTTERS REPORTED HEAVY RAIN PRODUCING FLASH FLOODING OVER THE WARNED AREA AND A MUD SLIDE EAST OF FOREST FALLS. LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO FOREST FALLS...OAK GLEN AND YUCAIPA PRECAUTIONARY/PREPAREDNESS ACTIONS... DEBRIS FLOWS...INCLUDING MUD AND ROCK SLIDES...ARE EXPECTED WITH THIS STORM. MUD SLIDES AND ROCK SLIDES CAN POTENTIALLY TRAP AND KILL PEOPLE CAUGHT IN THEIR PATH. 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 3410 11701 3411 11683 3396 11688 3397 11708 $$ MM
905 WGUS76 KSGX 172328 FFSSGX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SAN DIEGO CA 428 PM PDT FRI AUG 17 2012 CAC065-071-172336- /O.EXP.KSGX.FF.W.0024.000000T0000Z-120817T2330Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ RIVERSIDE CA-SAN BERNARDINO CA- 428 PM PDT FRI AUG 17 2012 ...THE FLASH FLOOD WARNING WILL EXPIRE AT 430 PM PDT FOR SOUTHWESTERN SAN BERNARDINO AND NORTHWESTERN RIVERSIDE COUNTIES... RAIN HAS BEEN DECREASING OVER THE PAST TWO HOURS OVER THE FOREST FALLS AREA. MILL CREEK AND OTHER TRIBUTARY CREEKS MAY STILL BE RUNNING FULL THE REST OF THE AFTERNOON...BUT WILL RAPIDLY RECEDE. LAT...LON 3410 11701 3411 11683 3396 11688 3397 11708 $$ MM
The office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 16, 7:07 PM PDT | Flash Flood Watch | SGX | Riverside, San Bernardino, San Diego | 25 hr |
| Aug 17, 12:14 PM PDT | Flash Flood Warning | SGX | Riverside | 61 min |
| Aug 17, 12:28 PM PDT | Flash Flood Warning | SGX | Riverside, San Diego | 2 hr |
| Aug 17, 12:55 PM PDT | Severe Thunderstorm Warning | SGX | Riverside | 50 min |
| Aug 17, 1:39 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 51 min |
| Aug 17, 1:40 PM PDT | Flash Flood Warning | SGX | San Diego | 95 min |
| Aug 17, 2:19 PM PDT | Flash Flood Warning | SGX | Riverside | 46 min |
| Aug 17, 3:19 PM PDT | Areal Flood Advisory | SGX | San Bernardino | 86 min |
| Aug 17, 4:47 PM PDT | Areal Flood Advisory | SGX | San Bernardino | 75 min |
Nearby
Flash Flood Warnings in California, 2012Every flash flood warning in 2012
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; radar from the NEXRAD Level II archive.