Alert archive / Arizona / Flash Flood Warnings in 2012
Flash Flood Warning 42, NWS Phoenix, AZ
NWS Phoenix, AZ issued this flash flood warning at Aug 20, 2012, 2:51 PM MST for La Paz County, Arizona. It was in force for 114 min. 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
- Aug 20, 2012, 2:51 PM MST (21:51 UTC)
- Expired
- Aug 20, 2012, 4:45 PM MST
- In force
- 114 min
- Issued by
- NWS Phoenix, AZ
- Area
- Storm-based polygon
- Flood severity
- None
County La Paz County, AZ
The radar
The Yuma radar (KYUX), 173 km from the middle of the area, began a volume at 21:54 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 20, 4:15 PM MST | FLASH FLOOD | Harcuvar, AZ | FLOODING AND FLASH FLOODING IN THE WASHES IN AND AROUND HARCUVAR |
| Aug 20, 4:15 PM MST | FLASH FLOOD | Salome, AZ | FLOODING AND FLASH FLOODING IN WASHES IN AND AROUND SALOME |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Yuma Intl Airpor, AZ (KYUM), launched 12:00Z, 9.9 hours before the alert went out and 156 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
- 606 J/kg
- Mixed-layer CIN
- -209 J/kg
- Mixed-layer LCL
- 1836 m above ground
- 0-6 km bulk shear
- 6 kt
- 0-1 km storm-relative helicity
- -44 m²/s²
- 0-3 km storm-relative helicity
- -13 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
931 WGUS55 KPSR 202151 FFWPSR AZC012-202345- /O.NEW.KPSR.FF.W.0042.120820T2151Z-120820T2345Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE PHOENIX AZ 251 PM MST MON AUG 20 2012 THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A * FLASH FLOOD WARNING FOR... CENTRAL LA PAZ COUNTY IN WEST CENTRAL ARIZONA... * UNTIL 445 PM MST * AT 240 PM MST...STRONG THUNDERSTORMS WITH VERY HEAVY RAIN WERE DEVELOPING NEAR THE TOWNS OF WENDEN...HARCUVAR...THE DESERTS EAST OF BOUSE AND NORTH OF VICKSBURG JUNCTION. THE ATMOSPHERE IS EXCESSIVELY MOIST TODAY. ANY THUNDERSTORM RAIN WILL LIKELY PRODUCE FLOOD OR FLASH FLOODING. HIGHWAYS 60 NEAR WENDEN...HIGHWAY 72 TO BOUSE...AND THE ALAMO LAKE HIGHWAY ARE ALL VULNERABLE TO FLOODING. 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...ROADS...AND LOW LYING SPOTS. UNBRIDGED CROSSINGS WILL BE ESPECIALLY DANGEROUS. && LAT...LON 3392 11403 3411 11358 3372 11338 3363 11375 $$ HV
3 follow-up statements
706 WGUS75 KPSR 202251 FFSPSR FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE PHOENIX AZ 351 PM MST MON AUG 20 2012 AZC012-202345- /O.CON.KPSR.FF.W.0042.000000T0000Z-120820T2345Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ LA PAZ AZ- 351 PM MST MON AUG 20 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 445 PM MST FOR CENTRAL LA PAZ COUNTY... A FLASH FLOOD WARNING CONTINUES LA PAZ COUNTY IN THE VICINITY OF THE TOWNS OF WENDEN...SALOME...HARCUVAR...BOUSE...AND VICKSBURG JUNCTION. AT 347 PM LARGE THUNDERSTORMS WITH HEAVY RAIN CONTINUED TO COVER THE AREA. THE ATMOSPHERE IS EXCESSIVELY MOIST TODAY AND CAPABLE OF PRODUCING FLOOD OR FLASH FLOOD THUNDERSTORM RAINS. FLOODING IS LIKELY OR IMMINENT. INFORMATION FROM THE AREA HAS BEEN DIFFICULT TO GET...SO NO REPORTS OF FLOODING HAVE BEEN RECEIVED YET. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WARNING MEANS THAT PEOPLE ALONG THE BANKS OF WASHES AND CREEKS SHOULD MOVE TO HIGHER GROUND IMMEDIATELY. NORMALLY DRY WASHES AND STREAMS WILL SUDDENLY HAVE RUNNING WATER AND MAKE UNBRIDGED CROSSINGS IMPASSABLE. STREETS...UNDERPASSES...AND LOW SPOTS WILL BECOME INUNDATED MAKING DRIVING HAZARDOUS IN THE WARNED AREA. EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF NORMALLY DRY WASHES AND CREEKS...ROADS...AND LOW LYING SPOTS. UNBRIDGED CROSSINGS WILL BE ESPECIALLY DANGEROUS. && LAT...LON 3392 11403 3411 11358 3372 11338 3363 11375 $$ HV
574 WGUS75 KPSR 202336 FFSPSR FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE PHOENIX AZ 436 PM MST MON AUG 20 2012 AZC012-202345- /O.CON.KPSR.FF.W.0042.000000T0000Z-120820T2345Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ LA PAZ AZ- 436 PM MST MON AUG 20 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 445 PM MST FOR CENTRAL LA PAZ COUNTY... THE FLASH FLOOD WARNING FOR AREAS NEAR THE TOWNS OF WENDEN... SALOME...HARCUVAR...VICKSBURG JUNCTION...AND BOUSE CONTINUES UNTIL 445 PM. THERE WERE REPORTS OF FLASH FLOODING IN THE VICINITY OF SALOME. PARKER SHERIFF REPORTED NO LIFE THREATENING EMERGENCIES...HOWEVER HIGHWAY CREWS WERE OUT IN FORCE TRYING TO MITIGATE SAFETY ISSUES FROM FLOODING. THE FLASH FLOOD WARNING COVERED A LOT OF AREA INCLUDING REMOTE DESERTS...SO ADDITIONAL FLOODING WAS LIKELY IN OTHER WASHES. MOTORIST ARE STILL ADVISE TO USE CAUTION WHEN TRAVELING IN LA PAZ COUNTY NEAR THUNDERSTORM RAINS. IT MAY STILL TAKE TIME FOR WATER TO WORK ITS WAY DOWN FROM THE DESERT MOUNTAINS. 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...ROADS...AND LOW LYING SPOTS. UNBRIDGED CROSSINGS WILL BE ESPECIALLY DANGEROUS. && LAT...LON 3392 11403 3411 11358 3372 11338 3363 11375 $$ HV
306 WGUS75 KPSR 202352 FFSPSR FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE PHOENIX AZ 452 PM MST MON AUG 20 2012 AZC012-202354- /O.EXP.KPSR.FF.W.0042.000000T0000Z-120820T2345Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ LA PAZ AZ- 452 PM MST MON AUG 20 2012 ...THE FLASH FLOOD WARNING WILL EXPIRE AT 445 PM MST FOR CENTRAL LA PAZ COUNTY... THE FLASH FLOOD WARNING ISSUED EARLIER FOR LOCATIONS NEAR THE TOWNS OF SALOME...HARCUVAR...WENDEN...BOUSE...AND VICKSBURG JUNCTION WAS ALLOWED TO EXPIRE AT 445 PM. HEAVY THUNDERSTORM RAINS IN THE AREA HAVE ENDED. THERE WERE SEVERAL REPORTS OF FLOODING IN AND AROUND THE TOWNS OF SALOME AND HARCUVAR. FORTUNATELY THERE WERE NO FLOOD EMERGENCIES...AND COUNTY ROAD CREWS ARE OUT IN FORCE TRYING TO MITIGATE ANY FLOOD SAFETY ISSUES. EXTREMELY HEAVY RAIN FELL MOSTLY IN THE REMOTE DESERTS AND DESERT MOUNTAINS NORTH AND SOUTH OF THE TOWN OF SALOME. IT IS LIKELY THAT ADDITIONAL FLOODING OCCURRED BUT NOT REPORTED. IT WILL TAKE SOME TIME FOR FLOOD WATERS TO SLOWLY RECEDE IN DESERT WASHES. LAT...LON 3392 11403 3411 11358 3372 11338 3363 11375 $$ HV
The office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 19, 5:42 PM MST | Areal Flood Advisory | PSR | Gila | 83 min |
| Aug 19, 5:55 PM MST | Special Weather Statement | PSR | Gila | 80 min |
| Aug 19, 6:57 PM MST | Special Weather Statement | PSR | 78 min | |
| Aug 19, 7:53 PM MST | Special Weather Statement | PSR | Pinal | 82 min |
| Aug 19, 7:59 PM MST | Special Weather Statement | PSR | Pinal | 76 min |
| Aug 20, 2:28 PM MST | Areal Flood Advisory | PSR | La Paz, Maricopa | 107 min |
| Aug 20, 2:32 PM MST | Severe Thunderstorm Warning | PSR | Maricopa | 28 min |
| Aug 20, 4:16 PM MST | Special Weather Statement | PSR | La Paz | 59 min |
| Aug 20, 4:47 PM MST | Special Weather Statement | PSR | Maricopa | 58 min |
Nearby
Flash Flood Warnings in Arizona, 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.