Flash Flood Warning 25, NWS Las Vegas, NV

Issued

Jul 11, 1999, 3:41 PM PDT (22:41 UTC)

Expired

Jul 11, 1999, 6:30 PM PDT

In force

3 hr

Issued by

NWS Las Vegas, NV

Area

Whole counties; the outline is the Mesonet’s reconstruction

County San Bernardino County, CA

000 
TTAA00 KVEF 112242
FFWLAS
CAC071-120130-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
341 PM PDT SUN JUL 11 1999

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTH CENTRAL SAN BERNARDINO COUNTY IN SOUTHEAST CALIFORNIA
  THIS INCLUDES THE FOLLOWING LOCATIONS...TWENTYNINE PALMS...VIDAL
  JUNCTION...STATE ROUTE 62

* UNTIL 630 PM PDT

* AT 336 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  HEAVY RAIN 9 MILES WEST OF TWENTYNINE PALMS MCAS...OR ABOUT 12
  MILES NORTHWEST OF TWENTYNINE PALMS...MOVING SOUTHEAST AT 10 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE WEST WIND AERO...TWENTYNINE
  PALMS MCAS AND JOSHUA TREE

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF WASHES
AND SMALL STREAMS. ADDITIONALLY...HIGHWAYS...UNDERPASSES AND OTHER
LOW LYING AREAS WILL BE SUBJECT TO FLASH FLOODING.

NEVER DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVlERS THE ROADWAY.
IT ONLY TAKES A FOOT OR TWO OF FLOWING WATER TO WASH MOST CARS AWAY.
VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY.

LAT...LON 3410 11638 3408 11452 3434 11464 3438 11651

NWS Las Vegas, NV wrote its last area forecast discussion before this flash flood warning went out at Jul 11, 2:45 PM PDT, 56 minutes earlier.

MOJAVE DESERT/SOUTHERN GREAT BASIN AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAS VEGAS NV
245 PM PDT SUN JUL 11 1999

SYNOPSIS...A VERY MOIST AND UNSTABLE AIR MASS WILL REMAIN OVER THE
REGION THROUGH TUESDAY. THIS WILL RESULT IN A CONTINUED THREAT FOR
MAINLY AFTERNOON SHOWERS AND THUNDERSTORMS. DAYTIME TEMPERATURES WILL
REMAIN BELOW NORMAL.

DISCUSSION...WILL KEEP FLASH FLOOD WATCH GOING AS PLENTY OF ACTIVITY
WITH HEAVY RAIN AND AT LEAST ONE WARNING THIS AFTERNOON OVER
NORTHWEST AZ AND SAN BERNARDINO COUNTY. NOTHING GOING IN CLARK AND
SOUTHERN NYE COUNTIES YET BUT WITH HIGH PRECIPITABLE WATER AND SOME
SUNSHINE STILL...EXPECT THUNDERSTORMS TO POP EVENTUALLY OR TO ADVECT
IN. MORE CAPPED AND A LITTLE MORE STABLE OVER NORTHERN NY AND LINCOLN
COUNTY AND WILL DROP POPS THERE DOWN TO SLIGHT CHANCE THIS EVENING.
SATELLITE EARLIER THIS AFTERNOON SHOWED TWO SEPERATE VORT MAXES...ONE
IN SOUTHWEST AZ AND ANOTHER MOVING NW INTO NW AZ. THIS SECOND VORT
MAX WILL KEEP SOME ACTIVITY GOING PAST THE EVENING HOURS IN SOME
LOCATIONS AND WILL WORD FORECAST AS SUCH. NO MAJOR CHANGE IN AIRMASS
OR WIND FLOW THROUGH TUESDAY SO WILL CONTINUE PERSISTENCE FORECAST
WITH GENERALLY SCATTERED MAINLY AFTERNOON AND EVENING THUNDERSTORMS.
AM HESITANT TO FLUSH MOISTURE OUT OF CWA IN EXTENDED EVEN THOUGH
MODELS HINTING AT MORE SOUTHWESTERLY FLOW DEVELOPING. TOUGH TO GET
THAT TO HAPPEN THIS TIME OF YEAR AND BELIEVE IT WOULD BE WISE TO KEEP
THE CHANCE OF AFTERNOON AND EVENING THUNDERSTORMS GOING.

.LAS...A FLASH FLOOD WATCH CONTINUES FOR NW AZ AND PORTIONS OF SRN NV
       AND ERN CA DESERTS UNTIL 9 PM PDT (04Z). REFER TO THE FLASH
       FLOOD WATCH STATEMENT FOR DETAILS.

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

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.