Flash Flood Warning 15, NWS Phoenix, AZ

Issued

Aug 27, 2003, 2:00 PM PDT (21:00 UTC)

Expired

Aug 27, 2003, 4:00 PM PDT

In force

2 hr

Issued by

NWS Phoenix, AZ

Area

Counties, with a storm outline in the text

Counties Riverside County, CA, San Bernardino County, CA

The San Diego radar (KNKX), 155 km from the middle of the area, began a volume at 21:03 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 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 272100
FFWPSR
CAC065-071-272300-

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

THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTH CENTRAL RIVERSIDE COUNTY IN SOUTHEAST CALIFORNIA
  SOUTH CENTRAL SAN BERNARDINO COUNTY IN SOUTHEAST CALIFORNIA

* UNTIL 400 PM PDT

* AT 155 PM PDT...WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY
  RAIN 12 MILES EAST OF LOST HORSE-KEYS VIEW JTNP...OR ABOUT 15 MILES
  SOUTH OF TWENTYNINE PALMS.  THE AREA OF HEAVY RAIN WAS NEARLY
  STATIONARY.

THUNDERSTORMS ARE EXPECTED TO CONTINUE OVER JOSHUA TREE NATIONAL 
PARK THROUGH 4 PM THIS AFTERNOON...AND ADDITIONAL HEAVY RAINFALL IS 
LIKELY.  THEREFORE THE FLASH FLOOD WARNING HAS BEEN EXTENDED.

AREAS THAT WILL BE AFFECTED BY FLASH FLOODING INCLUDE...PINTO BASIN 
ROAD...PINTO BASIN...HIDDEN VALLEY...COTTONWOOD SPRINGS...INDIAN 
COVE...AND BLACK ROCK CANYON.

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 3400 11648 3374 11598 3376 11565 3390 11556
          3392 11542 3413 11531 3412 11647

$$
MB

NWS Phoenix, AZ wrote its last area forecast discussion before this flash flood warning went out at Aug 27, 11:01 AM PDT, 2 hours 59 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; radar from the NEXRAD Level II archive.