Alert archive / California / Flash Flood Warnings in 1999

Flash Flood Warning 1, NWS Phoenix, AZ

July 13, 1999Riverside County, California

NWS Phoenix, AZ issued this flash flood warning at Jul 13, 1999, 4:07 PM PDT for Riverside County, California. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 13, 1999, 4:07 PM PDT (23:07 UTC)
Expired: Jul 13, 1999, 7:05 PM PDT
In force: 3 hr
Issued by: NWS Phoenix, AZ
Area: Whole counties

County Riverside County, CA

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Phoenix, AZ wrote its last area forecast discussion before this flash flood warning went out at Jul 13, 2:50 PM PDT, 1 hour 17 minutes earlier.

Area forecast discussion, Jul 13, 2:50 PM PDT, 1 hour 17 minutes before

SOUTHWEST ARIZONA/SOUTHEAST CALIFORNIA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PHOENIX AZ
250 PM MST TUE JUL 13 1999

.SYNOPSIS...
A VERY MOIST AIR MASS WILL CONTINUE OVER THE FORECAST AREA THROUGH
WEDNESDAY. AT THE SAME TIME...AN UPPER LEVEL DISTURBANCE ALONG THE
LOWER COLORADO RIVER VALLEY WILL SERVE TO LIFT THIS MOISTURE INTO
LOCALIZED HEAVY RAIN PRODUCING THUNDERSTORMS THIS EVENING. ON
WEDNESDAY...THERE COULD BE ADDITIONAL STRONG THUNDERSTORMS AS THE
UPPER DISTURBANCE APPROACHES...WITH SOME VERY STRONG AND GUSTY WINDS
POSSIBLE. MEANWHILE...A STRONG PACIFIC LOW PRESSURE AREA WILL PUSH
THE HIGH PRESSURE RIDGE CURRENTLY OVER THE AREA TO THE SOUTHEAST.
THIS WILL EVENTUALLY PUT SOUTHWEST ARIZONA AND SOUTHEAST CALIFORNIA
UNDER A DRIER WEST SOUTHWESTERLY WIND FLOW BY THE END OF THE WEEK.
SO...FEWER THUNDERSTORMS ARE EXPECTED BY THE WEEKEND.

.DISCUSSION...
THUNDERSTORMS FIRING TODAY OVER CWFA A LITTLE LATER THAN YESTERDAY AS
IT HAS TAKEN AWHILE FOR AIR MASS TO RECOVER FROM OVERNIGHT STORMS.
BUT...CONVECTION IS NOW UNDERWAY MOSTLY OVER HIGHER TERRAIN OF FAR
ERN CWFA RIGHT NOW. SHOULD STILL SEE SOME DRENCHING THUNDERSTORMS
DEVELOP OVER THE LOWER SOUTHWEST AZ AND SE CA DESERTS YET THIS
AFTERNOON IN SOUPY...UNSTABLE AIR MASS. VORT TROF ALONG CO RIVER
SHOULD HELP TO ACT AS TRIGGER...SO MAY SEE ACTION GO WAY INTO THE
NIGHT. ON WED...THIS VORT TROF BEGINS TO KICK THROUGH THE STATE IN
RESPONSE TO DIGGING PAC NW TROF...AND LOW/MID LEVEL SHEAR INCREASES.
SO...COULD ACTUALLY SEE SOME SEVERE MULTICELLS DURING MAX HEATING
TIME WED. BY THU...MODELS SUGGEST SOME DRYING/STABLIZING OVER WRN
CWFA...SO WILL TAKE STORMS OUT THIS AREA...LEAVE AT LEAST SLIGHT
CHANCE ERN PORTIONS. MRF FROM LAST NIGHT SUGGESTING THAT SWLY FLOW
WILL EVENTUALLY BECOME QUITE DRY...SO WILL GAMBLE AND TAKE OUT STORMS
FROM ENTIRE CWFA FORECAST ON SATURDAY/SUNDAY. PLEASE CHECK LATEST
FLASH FLOOD STATEMENTS REGARDING CURRENT FLASH FLOOD WATCH...WHICH
HAS BEEN EXPANDED TO COVER ENTIRE CWFA TIL 06Z.  ESTLE

In the hours before

Special weather statement, Jul 13, 12:33 PM PDT, 3 hours 34 minutes before

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The office that day

Everything else NWS Phoenix, AZ issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 13, 2:10 PM PDT	Severe Thunderstorm Warning	PSR	Maricopa	40 min

Nearby

Flash Flood Warnings in California, 1999 Every flash flood warning in 1999

Sources

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