Alert archive / California / Flash Flood Warnings in 2012
Flash Flood Warning 2, NWS Los Angeles, CA
NWS Los Angeles, CA issued this flash flood warning at Sep 9, 2012, 5:22 PM PDT for Los Angeles County, California. It was in force for 3 hr. 3 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 9, 2012, 5:22 PM PDT (00:22 UTC)
- Expired
- Sep 9, 2012, 8:15 PM PDT
- In force
- 3 hr
- Issued by
- NWS Los Angeles, CA
- Area
- Storm-based polygon
- Flood severity
- None
County Los Angeles County, CA
The radar
The Santa Ana Mts radar (KSOX), 70 km from the middle of the area, began a volume at 00:25 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 |
|---|---|---|---|
| Sep 9, 5:24 PM PDT | FLASH FLOOD | 4 E Pearblossom, CA | CALIFORNIA HIGHWAY PATROL IS REPORTING FLOODING ON HIGHWAY 138 AND 165TH ST E. |
| Sep 9, 5:27 PM PDT | FLASH FLOOD | 3 Se Pearblossom, CA | CALIFORNIA HIGHWAY PATROL IS REPORTING A BOULDER ACROSS THE ROADWAY NEAR VALERMO AND FORT TEJON ROADS. |
| Sep 9, 5:47 PM PDT | FLASH FLOOD | 4 E Pearblossom, CA | CALIFORNIA HIGHWAY PATROL REPORTS ALL EAST BOUND LANES ON HIGHWAY 138 BETWEEN 128TH EAST AND LONGVIEW EAST ARE UNDER WATER. |
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, 0.4 hours before the alert went out and 190 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
- 137 J/kg
- Mixed-layer CIN
- -379 J/kg
- Mixed-layer LCL
- 1160 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 67 m²/s²
- 0-3 km storm-relative helicity
- 107 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
254 WGUS56 KLOX 100022 FFWLOX CAC037-100315- /O.NEW.KLOX.FF.W.0002.120910T0022Z-120910T0315Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE OXNARD CA 522 PM PDT SUN SEP 9 2012 THE NATIONAL WEATHER SERVICE IN OXNARD HAS ISSUED A * FLASH FLOOD WARNING FOR... EAST CENTRAL LOS ANGELES COUNTY IN SOUTHWEST CALIFORNIA... * UNTIL 815 PM PDT * AT 513 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED FLASH FLOODING FROM A THUNDERSTORM 4 MILES SOUTHEAST OF PEARBLOSSOM...OR 10 MILES NORTH OF FALLING SPRINGS. NATIONAL WEATHER SERVICE DOPPLER RADAR ESTIMATES RAINFALL RATES BETWEEN 1 AND 2 INCHES PER HOUR MAY HAVE FALLEN ACROSS THE AREA. FLOODING WILL LIKELY OCCUR ACROSS THE HIGHWAYS 2 AND 138. * LOCATIONS IN THE WARNING INCLUDE PEARBLOSSOM AND CRYSTALAIRE. PRECAUTIONARY/PREPAREDNESS ACTIONS... 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. TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN OXNARD. && LAT...LON 3431 11797 3454 11793 3456 11779 3436 11774 $$ HALL
3 follow-up statements
542 WGUS76 KLOX 100107 FFSLOX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE OXNARD CA 607 PM PDT SUN SEP 9 2012 CAC037-100315- /O.CON.KLOX.FF.W.0002.000000T0000Z-120910T0315Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ LOS ANGELES CA- 607 PM PDT SUN SEP 9 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 815 PM PDT FOR EAST CENTRAL LOS ANGELES COUNTY... AT 606 PM PDT...NATIONAL WEATHER SERVICE TRAINED WEATHER SPOTTERS AND CALIFORNIA HIGHWAY PATROL ARE REPORTING FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA. FLASH FLOODING HAS BEEN REPORTED IN THE PEARBLOSSOM AND CRYSTALAIRE AREA OF THE ANTELOPE VALLEY FOOTHILLS...WITH WATER...MUD...AND ROCKS ACROSS HIGHWAY 138. TRAVEL ACROSS THE ANTELOPE VALLEY ALONG HIGHWAY 138 MAY BE DELAYED DUE TO FLOODING. PLEASE DELAY TRAVEL UNTIL FLOOD WATERS FROM THIS THUNDERSTORM HAVE RECEDED. PRECAUTIONARY/PREPAREDNESS ACTIONS... FLOODING IS OCCURRING OR IS IMMINENT. MOST FLOOD RELATED DEATHS OCCUR IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS WATER LOW WATER CROSSINGS. NEVER DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN. NEVER TRY TO CROSS A FLOWING STREAM OR WASH...EVEN A SMALL ONE...ON FOOT. TO ESCAPE RISING WATER MOVE UP TO HIGHER GROUND. TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN OXNARD. && LAT...LON 3431 11797 3454 11793 3456 11779 3436 11774 $$ HALL
950 WGUS76 KLOX 100201 FFSLOX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE OXNARD CA 701 PM PDT SUN SEP 9 2012 CAC037-100315- /O.CON.KLOX.FF.W.0002.000000T0000Z-120910T0315Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ LOS ANGELES CA- 701 PM PDT SUN SEP 9 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 815 PM PDT FOR EAST CENTRAL LOS ANGELES COUNTY... AT 701 PM PDT...NATIONAL WEATHER SERVICE TRAINED WEATHER SPOTTERS AND LOCAL LAW ENFORCEMENT OFFICIALS CONTINUE TO REPORT FLASH FLOODING OCCURRING IN THE ANTELOPE VALLEY THIS EVENING. CALIFORNIA HIGHWAY PATROL IS REPORTING A STRETCH OF HIGHWAY 138 NEAR PEARBLOSSOM UNDER WATER FROM PRIOR FLASH FLOODING. TRAVEL THROUGH THE EASTERN PORTION OF THE ANTELOPE VALLEY WILL LIKELY BE DELAYED DUE TO FLOODING OCCURRING ON AREA ROADWAYS. IT IS STRONGLY ADVISED TO DELAY TRAVEL UNTIL FLOOD WATERS HAVE RECEDED IN THE WARNING AREA. LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO PEARBLOSSOM AND CRYSTALAIRE. PRECAUTIONARY/PREPAREDNESS ACTIONS... FLOODING IS OCCURRING OR IS IMMINENT. MOST FLOOD RELATED DEATHS OCCUR IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS WATER LOW WATER CROSSINGS. NEVER TRY TO CROSS A FLOWING ARROYO OR DRY WASH N FOOT. TO ESCAPE RISING WATER MOVE UP TO HIGHER GROUND. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. 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. TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN OXNARD. && LAT...LON 3431 11797 3454 11793 3456 11779 3436 11774 $$ HALL
128 WGUS76 KLOX 100309 FFSLOX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE OXNARD CA 809 PM PDT SUN SEP 9 2012 CAC037-100315- /O.EXP.KLOX.FF.W.0002.000000T0000Z-120910T0315Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ LOS ANGELES CA- 809 PM PDT SUN SEP 9 2012 ...THE FLASH FLOOD WARNING WILL EXPIRE AT 815 PM PDT FOR EAST CENTRAL LOS ANGELES COUNTY... FLOODING CONTINUES TO RECEDE ACROSS THE ANTELOPE VALLEY AND THE NORTH FACING SLOPES OF THE SAN GABRIEL MOUNTAINS. SOME DRAINAGES AND WASHES MAY STILL BE SWOLLEN FROM THE RECENT HEAVY RAINFALL EARLIER THIS EVENING. LAT...LON 3431 11797 3454 11793 3456 11779 3436 11774 $$ HALL
The office that day
Everything else NWS Los Angeles, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 9, 6:40 PM PDT | Areal Flood Advisory | LOX | 93 min | |
| Sep 10, 3:23 AM PDT | Flash Flood Watch | LOX | 16 hr | |
| Sep 10, 2:15 PM PDT | Areal Flood Advisory | LOX | 3 hr | |
| Sep 10, 2:38 PM PDT | Flash Flood Warning | LOX | Ventura | 3 hr |
| Sep 10, 3:40 PM PDT | Flash Flood Warning | LOX | Los Angeles | 3 hr |
| Sep 10, 3:49 PM PDT | Severe Thunderstorm Warning | LOX | Los Angeles | 26 min |
| Sep 10, 4:11 PM PDT | Severe Thunderstorm Warning | LOX | Los Angeles | 64 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.