Alert archive / California / Flash Flood Warnings in 2012
Flash Flood Warning 60, NWS Phoenix, AZ
NWS Phoenix, AZ issued this flash flood warning at Sep 3, 2012, 4:23 PM PDT for Riverside County, California. It was in force for 112 min. 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
- Sep 3, 2012, 4:23 PM PDT (23:23 UTC)
- Expired
- Sep 3, 2012, 6:15 PM PDT
- In force
- 112 min
- Issued by
- NWS Phoenix, AZ
- Area
- Storm-based polygon
- Flood severity
- None
County Riverside County, CA
The radar
The Yuma radar (KYUX), 159 km from the middle of the area, began a volume at 23:24 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 3, 4:36 PM PDT | FLASH FLOOD | 5 Ne Desert Center, CA | CHP REPORTS ROADWAY FLOODING PROMPTING CLOSURE OF SR 177 NE OF DESERT CENTER. |
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 12:00Z, 11.4 hours before the alert went out and 209 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
- 3323 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 30 m²/s²
- 0-3 km storm-relative helicity
- 46 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
780 WGUS55 KPSR 032323 FFWPSR CAC065-040115- /O.NEW.KPSR.FF.W.0060.120903T2323Z-120904T0115Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE PHOENIX AZ 423 PM PDT MON SEP 3 2012 THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A * FLASH FLOOD WARNING FOR... CENTRAL RIVERSIDE COUNTY IN SOUTHERN CALIFORNIA... * UNTIL 615 PM PDT * AT 414 PM PDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED VERY HEAVY RAIN THAT WILL CAUSE FLASH FLOODING. * THE STORM PRODUCING VERY HEAVY RAIN THAT WILL CAUSE FLASH FLOODING HAS BEEN NEARLY STATIONARY OVER DESERT CENTER RICE ROAD FOR THE LAST HOUR. RADAR ESTIMATES THAT ONE HALF TO NEAR TWO INCHES OF RAIN HAS FALLEN OVER THE AREA HEAVY RAINFALL WILL CONTINUE AS THE STORM SLOWLY MOVES ACROSS THE ROADWAY... APPROXIMATELY 10 TO 12 MILES NORTHEAST OF DESERT CENTER. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WARNING MEANS THAT PEOPLE ALONG THE BANKS OF WASHES AND CREEKS SHOULD MOVE TO HIGHER GROUND IMMEDIATELY. NORMALLY DRY WASHES AND STREAMS WILL SUDDENLY HAVE RUNNING WATER AND MAKE UNBRIDGED CROSSINGS IMPASSABLE. STREETS...UNDERPASSES...AND LOW SPOTS WILL BECOME INUNDATED MAKING DRIVING HAZARDOUS IN THE WARNED AREA. MOST FLOOD DEATHS OCCUR IN MOTORIZED VEHICLES. WHEN ENCOUNTERING FLOODED ROADS...MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN. && LAT...LON 3384 11536 3386 11523 3378 11524 3376 11534 $$ NOLTE
2 follow-up statements
241 WGUS75 KPSR 032346 FFSPSR FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE PHOENIX AZ 446 PM PDT MON SEP 3 2012 CAC065-040115- /O.CON.KPSR.FF.W.0060.000000T0000Z-120904T0115Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ RIVERSIDE CA- 446 PM PDT MON SEP 3 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 615 PM PDT FOR CENTRAL RIVERSIDE COUNTY... AT 438 PM PDT...HIGHWAY PATROL HAS REPORTED ROADWAY FLOODING ALONG DESERT CENTER RICE ROAD OR STATE ROUTE 177 NORTH OF DESERT CENTER. A THUNDERSTORM PRODUCING VERY HEAVY RAIN THAT HAS CAUSED FLASH FLOODING IS SLOWING MOVING SOUTH OF THE AREA. WHILE THE RAINFALL MIGHT HAVE DISSIPATED OR ENDED ACROSS THE AREA...CONCERNS FOR FLASH FLOOD STILL CONTINUE AS RUNOFF WILL MOVE THROUGH THE AREA...IMPACTING ROADWAYS...ESPECIALLY THOSE WITH LOW WATER CROSSINGS. PRECAUTIONARY/PREPAREDNESS ACTIONS... MOST FLOOD DEATHS OCCUR IN MOTORIZED VEHICLES. WHEN ENCOUNTERING FLOODED ROADS...MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN. EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF NORMALLY DRY WASHES AND CREEKS...ROADS...AND LOW LYING SPOTS. UNBRIDGED CROSSINGS WILL BE ESPECIALLY DANGEROUS. && LAT...LON 3384 11536 3386 11523 3378 11524 3376 11534 $$ NOLTE
620 WGUS75 KPSR 040108 RRA FFSPSR FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE PHOENIX AZ 608 PM PDT MON SEP 3 2012 CAC065-040116- /O.EXP.KPSR.FF.W.0060.000000T0000Z-120904T0115Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ RIVERSIDE CA- 608 PM PDT MON SEP 3 2012 ...THE FLASH FLOOD WARNING WILL EXPIRE AT 615 PM PDT FOR CENTRAL RIVERSIDE COUNTY... THE ISOLATED THUNDERSTORM THAT PRODUCED HEAVY RAINFALL AND ROADWAY FLOODING NORTH OF DESERT CENTER HAS SINCE DISSIPATED. AS SUCH...THE FLASH FLOOD WARNING WILL BE ALLOWED TO EXPIRE. ROADWAY FLOODING AND RUNNING OF NORMALLY DRY WASHES WILL CONTINUE FOR THE NEXT FEW HOURS. DO NOT DRIVE AROUND ROAD BARRICADES OR WATER COVERED ROADWAYS. MAKE THE SMART CHOICE...TURN AROUND DONT DROWN. LAT...LON 3384 11536 3386 11523 3378 11524 3376 11534 $$ NOLTE
The office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 3, 3:52 PM PDT | Areal Flood Advisory | PSR | Riverside | 79 min |
| Sep 3, 4:23 PM PDT | Blowing Dust Advisory | PSR | 97 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.