Alert archive / California / Flash Flood Warnings in 2012
Flash Flood Warning 27, NWS Phoenix, AZ
NWS Phoenix, AZ issued this flash flood warning at Jul 31, 2012, 4:58 AM PDT for Imperial County, California. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 31, 2012, 4:58 AM PDT (11:58 UTC)
- Expired
- Jul 31, 2012, 8:00 AM PDT
- In force
- 3 hr
- Issued by
- NWS Phoenix, AZ
- Area
- Storm-based polygon
- Flood severity
- None
County Imperial County, CA
The radar
The Yuma radar (KYUX), 114 km from the middle of the area, began a volume at 11:58 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
San Diego, CA (KNKX), launched 00:00Z, 12.0 hours before the alert went out and 155 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
- 1963 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 12 m²/s²
- 0-3 km storm-relative helicity
- 57 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
861 WGUS55 KPSR 311158 FFWPSR CAC025-311500- /O.NEW.KPSR.FF.W.0027.120731T1158Z-120731T1500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE PHOENIX AZ 458 AM PDT TUE JUL 31 2012 THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A * FLASH FLOOD WARNING FOR... CENTRAL IMPERIAL COUNTY IN SOUTHEAST CALIFORNIA... THIS INCLUDES BRAWLEY... * UNTIL 800 AM PDT * AT 454 AM PDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED VERY HEAVY RAIN THAT WILL CAUSE FLASH FLOODING. A STATIONARY BAND OF HEAVY RAIN WITH HOURLY RAINFALL RATES OF 1 TO 2 INCHES PER HOUR IS AFFECTING THE AREA. RADAR ESTIMATES OF 1 TO 1.5 INCHES OF RAIN HAS ALREADY FALLEN IN PARTS OF THE WARNED AREA. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO CALIPATRIA AND WESTMORLAND. 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. EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF NORMALLY DRY WASHES AND CREEKS...STREETS AND UNDERPASSES...AND DETENTION BASINS AFFECTING SOME COMMUNITY PARKS. UNBRIDGED CROSSINGS WILL BE ESPECIALLY DANGEROUS. 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 3329 11563 3310 11539 3294 11552 3313 11579 $$ KUHLMAN
1 follow-up statement
757 WGUS75 KPSR 311327 FFSPSR FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE PHOENIX AZ 627 AM PDT TUE JUL 31 2012 CAC025-311500- /O.CON.KPSR.FF.W.0027.000000T0000Z-120731T1500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ IMPERIAL CA- 627 AM PDT TUE JUL 31 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 800 AM PDT FOR CENTRAL IMPERIAL COUNTY... AT 624 AM PDT...NATIONAL WEATHER SERVICE RADAR ESTIMATES OF 2 TO 3 INCHES OF RAIN HAS FALLEN SINCE 4 AM...POTENTIALLY CAUSING FLASH FLOODING. THE RAINFALL HAS DIMINISHED CONSIDERABLY...BUT LIGHT RAIN CONTINUES TO FALL IN THE WARNED AREA. ADDITIONAL RAINFALL AMOUNTS OF A QUARTER TO ONE HALF INCH WILL BE POSSIBLE THROUGH 8 AM. LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO CALIPATRIA. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WARNING MEANS THAT PEOPLE ALONG THE BANKS OF WASHES AND CREEKS SHOULD MOVE TO HIGHER GROUND IMMEDIATELY. NORMALLY DRY WASHES AND STREAMS WILL SUDDENLY HAVE RUNNING WATER AND MAKE UNBRIDGED CROSSINGS IMPASSABLE. STREETS...UNDERPASSES...AND LOW SPOTS WILL BECOME INUNDATED MAKING DRIVING HAZARDOUS IN THE WARNED AREA. EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF NORMALLY DRY WASHES AND CREEKS...STREETS AND UNDERPASSES...AND DETENTION BASINS AFFECTING SOME COMMUNITY PARKS. UNBRIDGED CROSSINGS WILL BE ESPECIALLY DANGEROUS. EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF NORMALLY DRY WASHES AND CREEKS...ROADS...AND LOW LYING SPOTS. UNBRIDGED CROSSINGS WILL BE ESPECIALLY DANGEROUS. && LAT...LON 3329 11563 3310 11539 3294 11552 3313 11579 $$ KUHLMAN
The office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 6:15 PM PDT | Areal Flood Advisory | PSR | Imperial | 2 hr |
| Jul 30, 7:31 PM PDT | Areal Flood Warning | PSR | Imperial | 15 hr |
| Jul 31, 3:42 AM PDT | Flash Flood Watch | PSR | 15 hr | |
| Jul 31, 4:49 AM PDT | Areal Flood Advisory | PSR | Imperial | 116 min |
| Jul 31, 9:02 AM PDT | Areal Flood Advisory | PSR | Riverside, San Bernardino | 3 hr |
| Jul 31, 10:16 AM PDT | Flash Flood Warning | PSR | Imperial, Riverside, San Bernardino | 3 hr |
| Jul 31, 12:12 PM PDT | Severe Thunderstorm Warning | PSR | Riverside, San Bernardino | 49 min |
| Jul 31, 1:28 PM PDT | Areal Flood Advisory | PSR | Imperial, Riverside | 3 hr |
| Jul 31, 1:31 PM PDT | Flash Flood Warning | PSR | San Bernardino | 119 min |
| Jul 31, 3:40 PM PDT | Areal Flood Advisory | PSR | Riverside, San Bernardino | 2 hr |
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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.