Flash Flood Warning 14, NWS Phoenix, AZ

Issued

Aug 27, 2003, 12:33 PM PDT (19:33 UTC)

Expired

Aug 27, 2003, 2:00 PM PDT

In force

87 min

Issued by

NWS Phoenix, AZ

Area

Counties, with a storm outline in the text

Counties Riverside County, CA, San Bernardino County, CA

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this flash flood 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 
WGUS55 KPSR 271937
FFWPSR
CAC065-071-272100-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
1233 PM PDT WED AUG 27 2003

THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  JOSHUA TREE NATIONAL PARK IN CENTRAL RIVERSIDE COUNTY OF SOUTHEAST 
  CALIFORNIA

* UNTIL 200 PM PDT

* AT 1224 PM PDT...WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY
  RAIN 7 MILES NORTH OF LOST HORSE-KEYS VIEW JTNP...OR ABOUT 10 MILES
  SOUTH AND SOUTHWEST OF TWENTYNINE PALMS. THE AREA OF HEAVY RAIN WAS
  NEARLY STATIONARY.

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF CREEKS
AND STREAMS...ROADS AND ROADSIDE CULVERTS. THE HEAVY RAINS COULD ALSO
TRIGGER ROCK AND MUDSLIDES IN STEEP TERRAIN.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY.
MOVE TO HIGHER GROUND.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT. IT IS
IMPORTANT TO KNOW WHERE YOU ARE RELATIVE TO STREAMS...RIVERS...OR
CREEKS WHICH CAN BECOME KILLERS IN HEAVY RAINS. CAMPERS SHOULD AVOID
CAMPING ALONG STREAMS OR CREEKS DURING THREATENING RAINS.

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 3391 11649 3376 11562 3413 11558 3415 11649

$$

NWS Phoenix, AZ wrote its last area forecast discussion before this flash flood warning went out at Aug 27, 11:01 AM PDT, 1 hour 32 minutes earlier.

AZZ020>028-CAZ030>033-272245-

SOUTHWEST ARIZONA/SOUTHEAST CALIFORNIA FORECAST DISCUSSION...CORECTED
NATIONAL WEATHER SERVICE PHOENIX AZ
1030 AM MST WED AUG 27 2003

.SYNOPSIS...
ABUNDANT MOISTURE FROM FORMER HURRICANE IGNACIO WILL CONTINUE OVER
THE AREA THROUGH TODAY AND THIS EVENING. THIS MEANS SHOWERS AND
THUNDERSTORMS TONIGHT...WITH SOME HEAVY RAIN POSSIBLE AND COOLER
WEATHER TODAY. HIGH PRESSURE ALOFT FROM THE PACIFIC IS EXPECTED TO
BRING WARMER WEATHER AND A REDUCTION IN THUNDERSTORMS BY FRIDAY.

.DISCUSSION...
 A FLASH FLOOD WATCH IS IN EFFECT FOR SOUTH-CENTRAL AND SOUTHWEST
ARIZONA AND SOUTHEAST CALIFORNIA TODAY THROUGH 11 PM MST/PDT OR 0600
GMT TONIGHT. ABUNDANT MOISTURE FROM FORMER HURRICANE IGNACIO
CONTINUES OVER THE AREA. THE AIRMASS HAS AS MUCH MOISTURE AS IT EVER
HOLDS IN SOUTHEAST CALIFORNIA...SOUTHWEST AND SOUTH-CENTRAL ARIZONA.
THUS...EXPECT SOME AREAS WITH FLASH FLOODING AGAIN TODAY DUE TO
EXCESSIVE HEAVY RAIN ALONG WITH COOLER WEATHER...ESPECIALLY ARIZONA
PORTION. THUS...THE REASON FOR THE FLASH FLOOD WATCH. HIGH PRESSURE
ALOFT FROM THE PACIFIC IS EXPECTED TO BRING WARMER WEATHER AND A
REDUCTION IN THUNDERSTORMS BY FRIDAY.

.PSR...FLASH FLOOD WATCH FOR ENTIRE AREA...SOUTH-CENTRAL AND
       SOUTHWEST ARIZONA ZONES 20 THROUGH 28...AND SOUTHEAST
       CALIFORNIA ZONES 30 THROUGH 32 TODAY THROUGH 11 PM MST/PDT
       TONIGHT OR 28/0600 GMT.

ELLIS

AZZ020>028-CAZ030>033-280100-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PHOENIX AZ
939 AM MST WED AUG 27 2003

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

.DAY ONE...TODAY

...FLASH FLOOD WATCH FOR SOUTH-CENTRAL AND SOUTHWEST ARIZONA...
AND SOUTHEAST CALIFORNIA TODAY THROUGH 11 PM TONIGHT...

SHOWERS AND THUNDERSTORMS ARE FORECAST TO PRODUCE SOME HEAVY RAIN
WITH EXCESSIVE VERY HEAVY RAIN AND FLASH FLOODING IN SOME AREAS.
THIS SITUATION WILL BE ENHANCED WHERE THE GROUND IS ALREADY
SATURATED...AND ANY ADDITIONAL RAINFALL WILL LEAD TO RAPID RUNOFF.
AVOID LOW SPOTS...HIGHWAY DIPS...WASHES AND CREEKS THAT COULD EASILY
BECOME FLOODED. STAY AWAY FROM FLOODED ROADS AND OTHER FLOOD PRONE
AREAS. IF YOU OBSERVE FLOODING...DO NOT WAIT FOR A WARNING TO BE
ISSUED...MOVE TO HIGHER GROUND IMMEDIATELY.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.INSTRUCTIONS TO SKYWARN SPOTTERS...
SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS
ACCORDING TO STANDARD OPERATING PROCEDURES.

ELLIS

Flash Flood Warnings in California, 2003Every flash flood 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.