Severe Thunderstorm Warning 22, NWS Phoenix, AZ

Issued

Aug 11, 2001, 10:19 PM MST (05:19 UTC)

Expired

Aug 11, 2001, 11:00 PM MST

In force

41 min

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), 30 km from the middle of the area, began a volume at 05:20 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.

032 
WUUS55 KPSR 120524
SVRPHX
AZC027-CAC025-120545-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
1019 PM MST SAT AUG 11 2001

THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME SOUTHEASTERN IMPERIAL COUNTY IN SOUTHEAST CALIFORNIA       
  SOUTHWEST YUMA COUNTY IN SOUTHWEST ARIZONA
  THE SEVERE THUNDERSTORM WARNING INCLUDES THE TOWNS OF YUMA...
  WINTERHAVEN...GADSDEN AND SOMERTON.

* UNTIL 1100 PM MST(1100 PM PDT)

* AT 1025 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 6 MILES NORTHEAST OF WINTERHAVEN...OR ABOUT 9
  MILES NORTHEAST OF YUMA...MOVING SOUTH AT 15 MPH.

DAMAGING MICROBURST WINDS ARE LIKELY WITH THIS STORM. VERY HEAVY RAIN
IS ALSO POSSIBLE. TAKE COVER IN A SUBSTANTIAL SHELTER UNTIL THE STORM
PASSES.

INTENSE LIGHTNING IS OCCURRING WITH THIS STORM...MOVE INDOORS IF
POSSIBLE. WHEN INDOORS...STAY AWAY FROM WINDOWS AND DOORS. IF
TELEPHONE USE IS REQUIRED...USE A CELL PHONE. UNPLUG ANY UNNECESSARY
ELECTRICAL APPLIANCES BEFORE THE STORM ARRIVES. IF OUTDOORS...AVOID
ISOLATED TALL OBJECTS SUCH AS TREES.

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

LAT...LON 3286 11442 3285 11464 3253 11464 3254 11438

NWS Phoenix, AZ wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 11, 9:00 PM MST, 1 hour 19 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

Severe Thunderstorm Warnings in Arizona, 2001Severe Thunderstorm Warnings in California, 2001Every severe thunderstorm 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.