Severe Thunderstorm Warning 61, NWS Phoenix, AZ

Issued

Aug 31, 2003, 6:22 PM MST (01:22 UTC)

Expired

Aug 31, 2003, 7:15 PM MST

In force

53 min

Issued by

NWS Phoenix, AZ

Area

Counties, with a storm outline in the text

Counties Gila County, AZ, Maricopa County, AZ

The Phoenix radar (KIWA), 54 km from the middle of the area, began a volume at 01:25 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.

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

000 
WUUS55 KPSR 010122
SVRPSR
AZC007-013-010215-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
618 PM MST SUN AUG 31 2003

THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WEST CENTRAL GILA COUNTY IN EAST CENTRAL ARIZONA
  EXTREME EAST CENTRAL MARICOPA COUNTY IN SOUTH CENTRAL ARIZONA

* UNTIL 715 PM MST.

* AT 612 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 6 MILES WEST OF ROOSEVELT...MOVING SOUTHWEST AT
  10 MPH. THIS STORM WILL AFFECT APACHE LAKE...CANYON LAKE...AND 
TORTILLA FLAT. 

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

LARGE HAIL IS POSSIBLE WITH THIS SEVERE THUNDERSTORM. IF YOU ARE IN 
THE PATH OF THE STORM...PUT YOUR CAR IN A GARAGE AND MOVE TO A 
SUBSTANTIAL SHELTER. BOATERS ARE URGED TO SEEK SHELTER OFF OF THE 
WATER. 

INTENSE LIGHTNING IS OCCURRING WITH THIS STORM...MOVE INDOORS IF 
POSSIBLE. AVOID TALL ISOLATED OBJECTS SUCH AS TREES. WHEN 
INDOORS...STAY AWAY FROM WINDOWS AND DOORS. 

IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER FROM THE WEATHER IN A STRONG
BUILDING. DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN...AND DEADLY
LIGHTNING ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS. STAY INSIDE AWAY
FROM WINDOWS UNTIL THE STORM HAS PASSED.

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 3366 11109 3376 11126 3364 11135 3352 11148
          3350 11126

$$

NWS Phoenix, AZ wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 31, 2:45 PM MST, 3 hours 37 minutes earlier.

AZZ020>028-CAZ030>033-010545-

SOUTHWEST ARIZONA/SOUTHEAST CALIFORNIA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PHOENIX AZ
245 PM MST SUN AUG 31 2003

.SYNOPSIS...
AN UPPER LEVEL HIGH PRESSURE AREA WILL MOVE ACROSS ARIZONA TO NEAR
THE FOUR CORNERS BY LABOR DAY. AT THE SAME TIME...AN UPPER LEVEL LOW
PRESSURE SYSTEM WILL MOVE TOWARDS SOUTHWEST ARIZONA. AS THIS FEATURE
APPROACHES THE STATE...AND THE HIGH TO OUR NORTH FEEDS ADDED MOISTURE
INTO THE REGION...THE THREAT FOR AFTERNOON AND EVENING SHOWERS AND
THUNDERSTORMS WILL BE ON THE RISE...MAINLY LABOR DAY INTO WEDNESDAY.
THUNDERSTORM THREATS WILL DIMINISH ONCE AGAIN ACROSS FAR SOUTHWEST
ARIZONA AND SOUTHEAST CALIFORNIA TOWARDS THE END OF THE WEEK. NO
LARGE DAY-TO-DAY VARIATION IN TEMPERATURES IS EXPECTED THIS WEEK.

.DISCUSSION...
WITH THE CONTINUED LOW LEVEL MOIST AIR AND AFTERNOON HEATING...A FEW
THUNDERSTORMS HAVE DEVELOPED OVER AND NEAR THE HIGHER TERRAIN OF
SOUTH CENTRAL AZ THIS AFTERNOON. THESE STORMS WILL BE DIMINISHING
WITH SUNSET. UPPER HIGH WHICH WAS CENTERED OFF THE SOUTHERN CA COAST
HAS MOVED OVER SOUTHERN CA BY THIS AFTERNOON AND WILL BE ENTERING AZ
TONIGHT. THIS WILL BRING THE REGION A MOSTLY CLEAR NIGHT TONIGHT.
THE UPPER HIGH WILL CONTINUE TO TRACK TO THE NE AND INTO NORTHERN
AZ/4 CORNERS AREA BY MON AFTERNOON AND REMAIN THERE THROUGHOUT MUCH
OF THE WEEK. THIS  WILL BRING AN E-SE FLOW BACK TO THE AREA WHICH
WILL BEGIN TO IMPORT A BIT MORE MOISTURE TO THE ALREADY MOIST LOWER
LEVELS WHICH HAS REMAINED OVER THE REGION FOR THE PAST SEVERAL DAYS.
HOWEVER MODELS SHOW THE MAIN FETCH OF THIS ADDED MOISTURE TO BE
ADVECTED INTO SW AZ AND SE CA MON/TUES. AT THE SAME TIME A VORTMAX
ROTATES AROUND THE UPPER HIGH UP THROUGH THE LOWER CO RIVER VALLEY
WHICH WILL PROVIDE DYNAMICS TO THE MOIST AIRMASS RESULTING IN A
SLIGHT CHANCE OF THUNDERSTORMS FOR SE CA EASTWARD THROUGH SOUTH
CENTRAL AZ MON AND TUES THEN THE SLIGHT CHANCE CONTINUING THROUGH
MID WEEK WITH ITS RESIDUAL MOISTURE. THIS DISTURBANCE WILL ROTATE
OVER THE TOP OF THE HIGH THROUGH ID WY FLATTENING THE RIDGE A BIT
CAUSING A DRIER SW FLOW INTO SE CA AND SW AZ RESULTING IN PARTLY
CLOUDY DAYS ON FRI AND INTO THE WEEKEND. A MOIST AIRMASS AND THE E
TO NE FLOW ALOFT WILL KEEP A CHANCE FOR THUNDERSTORMS OVER SOUTH
CENTRAL AZ THROUGHOUT MID AND LATE WEEK AND INTO THE WEEKEND.
TEMPS WILL LOWER JUST A DEG OR TWO EARLY IN THE WEEK AS A LITTLE
MORE MOISTURE ENTERS THEN WILL LEVEL OUT.  DKS

.PSR...NONE.

AZZ020>028-CAZ030>033-010100-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PHOENIX AZ
600 AM MST SUN AUG 31 2003

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHWEST AND
SOUTH-CENTRAL ARIZONA...AND SOUTHEAST CALIFORNIA.

.DAY ONE...TODAY

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

Severe Thunderstorm Warnings in Arizona, 2003Every severe thunderstorm warning in 2003

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.