Flash Flood Warning 8, NWS Phoenix, AZ

Issued

Aug 11, 2001, 10:30 PM PDT (05:30 UTC)

Expired

Aug 11, 2001, 10:30 PM PDT

In force

Issued by

NWS Phoenix, AZ

Area

Whole counties; the outline is the Mesonet’s reconstruction

Counties Yuma County, AZ, Imperial County, CA

The Yuma radar (KYUX), 12 km from the middle of the area, began a volume at 05:32 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.

000 
WGUS55 KPSR 120530
FFWPHX
FFWPHX
AZC027-CAC025-120600-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
1030 PM MST SAT AUG 11 2001

THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EXTREME SOUTHEASTERN IMPERIAL COUNTY IN SOUTHEAST CALIFORNIA
  EXTREME WEST CENTRAL YUMA COUNTY IN SOUTHWEST ARIZONA

* UNTIL 1130 PM MST(1130 PM PDT)

* AT 1025 PM MST...WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY
  RAIN OVER YUMA...MOVING SOUTH AT 25 MPH.

* THE THUNDERSTORM WITH EXCESSIVE RAINFALL WILL BE NEAR...
  SOMERTON AT 1045 PM MST
  GADSDEN AT 1055 PM MST
  SAN LUIS AT 1100 PM MST

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. IF YOUR VEHICLE STALLS...ABANDON IT IMMEDIATELY AND SEEK
HIGHER GROUND.

TO REPORT SEVERE WEATHER HAVE THE NEAREST LAW ENFORCEMENT AGENCY
RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN
PHOENIX.

LAT...LON 3274 11451 3277 11472 3239 11484 3235 11458

NWS Phoenix, AZ wrote its last area forecast discussion before this flash flood warning went out at Aug 11, 9:00 PM PDT, 1 hour 30 minutes earlier.

AZZ020>028-CAZ030>033-121045-

SOUTHWEST ARIZONA/SOUTHEAST CALIFORNIA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PHOENIX AZ
900 PM MST SAT AUG 11 2001

.SYNOPSIS...
VERY MOIST...UNSTABLE AIR OVER SOUTH-CENTRAL AND SOUTHWEST ARIZONA
AND SOUTHEAST CALIFORNIA TRANSLATES INTO AN ONGOING POSSIBILITY OF
SHOWERS AND THUNDERSTORMS ACROSS THE REGION THROUGH NEXT WEEK.

.DISCUSSION...
INVERTED TROUGH OVER S-CNTRL AZ PROVIDING FORCING NEEDED TO KEEP A
NUMBER OF STORMS GOING OVERNIGHT. DEFORMATION AXIS AND VORTICITY
FIELD ASSOCIATED WITH THE TROUGH HAS MOVED INTO S-CNTRL AZ...WITH
POSITIVE VORTICITY ADVECTION WWD OVER THE CWA. THE DEFORMATION AXIS
MOVES W OF THE CWA BY MON NIGHT...BUT SHOULD HELP TO FORCE STORMS
BEFORE THAT. WILL MAKE MORE ADJUSTMENTS TO THE CURRENT FORECAST FOR
TONIGHT...MAINLY TO TAKE OUT TIME QUALIFIERS SUCH AS EVENING. IT
APPEARS TO ME THE POPS ARE A BIT LOW IN THE GUIDANCE FOR THE SW AZ
AND SE CA AREAS. SW AZ AND SE CA AREAS HAVE BEEN ACTIVE THIS EVE...
WITH SOME HEAVY RNFL IN SPOTS...AS WELL AS ISOLD TSTM GUSTS OVER 40
MPH. LOOK FOR THIS TYPE OF ACTION TO CONTINUE OFF AND ON UNTIL THE
DEFORMATION AXIS CLEARS THAT AREA. MORE STORMS ARE DEVELOPING OVER
THE NRN PHX METRO AREA AT THIS TIME. JUST GOES TO SHOW YOU.  WILT

Flash Flood Warnings in California, 2001Flash Flood Warnings in Arizona, 2001Every flash flood warning in 2001

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.