Flash Flood Warning 34, NWS Las Vegas, NV

MOJAVE DESERT/SOUTHERN GREAT BASIN AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAS VEGAS NV
255 PM PDT MON AUG 31 1998

SYNOPSIS...AN UPPER LEVEL DISTURBANCE OVER NEVADA WILL SLOWLY DRIFT
TO NEAR THE FOUR CORNERS WEDNESDAY. MOISTURE AND INSTABILITY WILL
DECREASE SLIGHTLY...BUT THERE IS THE THREAT OF SHOWERS AND
THUNDERSTORMS WITHIN THE SOUTHERN GREAT BASIN AND MOHAVE DESERT.

DISCUSSION...SATELLITE AND RADAR DETECTING THUNDERSTORMS ON THE
INCREASE TO THE WEST OF LAS VEGAS. STILL RELATIVELY QUITE TO THE
EAST. WATER VAPOR SHOWS VORTICITY CENTER SOUTHEAST OF TONOPAH. THIS
FEATURE DROPPING SOUTHEAST AND WILL BE FOCUS FOR FURTHER DEVELOPMENT
INTO THE COLORADO RIVER VALLEY AND NORTHWEST ARIZONA. LEAVING FLASH
FLOOD WATCH UP AND EXPANDING IT TO INCLUDE INYO...ESMERALDA AND
CENTRAL NYE COUNTIES. FOR LATER PERIODS UPPER LEVEL DISTURBANCE
SLOWLY DRIFTS EAST TO FOUR CORNERS. ATMOSPHERE WILL GRADUALLY DRY AND
STABILIZE FROM NORTHWEST TO SOUTHEAST...BUT CAN NOT RULE OUT THE
POSSIBILITY OF THUNDERSTORMS EACH DAY...ESPECIALLY OVER NORTHWEST
ARIZONA. FOR THE MEDIUM RANGE HIGH CENTER CURRENTLY OFF THE WEST
COAST MIGRATES TOWARD THE FOUR CORNERS BY DAY FOUR OR FIVE. THINKING
ATMOSPHERE MAY BE CAPPED THURSDAY FOR DRY DAY. MOISTURE WILL RETURN
ON A EAST OR SOUTHEAST FLOW BY THE WEEKEND. LAS 6221. PIERCE

A FLASH FLOOD WATCH IS IN EFFECT UNTIL 900 PM.  PLEASE REFER TO THE
LATEST FLASH FLOOD WATCH BULLETIN FOR DETAILS.

AZZ001>003-036-CAZ026>029-NVZ014>022-010400-

BULLETIN...IMMEDIATE BROADCAST REQUESTED
FLASH FLOOD WATCH...RETRANSMITTED
NATIONAL WEATHER SERVICE LAS VEGAS NV
315 PM PDT (315 PM MST) MON AUG 31 1998

...FLASH FLOOD WATCH HAS BEEN EXPANDED TO INCLUDE ESMERALDA AND
CENTRAL NYE COUNTIES IN NEVADA AND INYO COUNTY CALIFORNIA UNTIL 900
PM PDT...

...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 900 PM PDT/MST FOR
SOUTHERN NYE...CLARK AND LINCOLN COUNTIES IN NEVADA....MOHAVE COUNTY
ARIZONA AND SAN BERNARDINO COUNTY CALIFORNIA...

THIS INCLUDES LAS VEGAS...HENDERSON...PAHRUMP...CALIENTE...BEATTY...
GOLDFIELD...KINGMAN...WIKIEUP...LAUGHLIN-BULLHEAD CITY...NEEDLES
...LAKE HAVASU CITY...DEATH VALLEY NATIONAL PARK...THE WESTERN END OF
THE GRAND CANYON...AND THE ENTIRE LAKE MEAD NATIONAL RECREATION AREA.

SATELLITE AND RADAR INDICATE SHOWERS AND THUNDERSTORMS ACROSS THE
WESTERN PORTION OF THE WATCH AREA AT MID AFTERNOON. AN UPPER LEVEL
DISTURBANCE OVER NYE COUNTY WILL DROP SOUTHEAST ACROSS SOUTHERN
NEVADA LATER THIS EVENING. THUNDERSTORMS ARE ALREADY DEVELOPING OVER
CLARK COUNTY AND WILL CONTINUE TO DEVELOP EAST INTO MOHAVE COUNTY.
STRONG THUNDERSTORMS WITH VERY HEAVY RAIN AND STRONG WIND GUSTS ARE
LIKELY. A FEW OF THE STORMS COULD PRODUCE LOCALIZED RAINFALL AMOUNTS
OF BETWEEN ONE AND TWO INCHES IN LESS THAN ONE HOUR. RAINFALL OF THIS
INTENSITY WOULD CAUSE FLASH FLOODING OF WASHES...CANYONS...AND OTHER
LOW-LYING OR URBANIZED AREAS.

A FLASH FLOOD WATCH MEANS THERE IS THE POTENTIAL FOR FLASH FLOODING
IN AND CLOSE TO THE WATCH AREA. BE READY TO TAKE QUICK ACTION IF
FLASH FLOODING IS OBSERVED OR A WARNING IS ISSUED FOR YOUR AREA. DO
NOT BECOME A VICTIM BY ATTEMPTING TO DRIVE OR WADE THROUGH RUNNING
WATER YOU COULD BECOME STRANDED OR THE FORCE OF THE CURRENT COULD
SWEEP YOU OR YOUR VEHICLE AWAY.

LISTEN FOR ADDITIONAL UPDATES OR POSSIBLE WARNINGS FROM THE NATIONAL
WEATHER SERVICE.

PIERCE