Flash Flood Warning 5, NWS Las Vegas, NV

Issued

Jul 20, 1998, 12:50 AM PDT (07:50 UTC)

Expired

Jul 20, 1998, 2:30 AM PDT

In force

100 min

Issued by

NWS Las Vegas, NV

Area

Whole counties

County Clark County, NV

000 
TTAA00 KLAS 200815 COR
FFWLAS
NVC003-200930-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING...CORRECTED FOR SPELLING
NATIONAL WEATHER SERVICE LAS VEGAS NV
1250 AM PDT MON JUL 20 1998


*  FLASH FLOOD WARNING FOR
   CENTRAL CLARK COUNTY IN SOUTHERN NEVADA

*  UNTIL 230 AM PDT

*  SOME LOCATIONS AFFECTED
   THE GREATER LAS VEGAS VALLEY INCLUDING NORTH LAS VEGAS...BOULDER
   CITY...HENDERSON AND THE LAS VEGAS METRO AREA

*  THUNDERSTORMS AROUND THE VALLEY HAS FURNISHED HEAVY RAINFALL
ACROSS THE AREA THAT WILL CAUSE PONDING IN LOW LYING AREAS
AND WILL FILL WASHES WITH RUNOFF UNTIL 230 AM.  THUS THE NATIONAL
WEATHER SERVICE IN LAS VEGAS HAS ISSUED A FLASH FLOOD WARNING FOR
THE GREATER LAS VEGAS VALLEY.

FLAMINGO WASH AND DECATUR REPORTED .71 INCHES OF RAIN FROM MIDNIGHT
UNTIL 1245 AM.

NEVER CROSS FLOODED ROADWAYS EITHER BY FOOT OR VEHICLE.  MOVE TO
SAFETY IF ENCROACHED BY FLOOD WATERS.

CORDERO

NWS Las Vegas, NV wrote its last area forecast discussion before this flash flood warning went out at Jul 19, 2:11 AM PDT, 22 hours 39 minutes earlier.

MOJAVE DESERT/SOUTHERN GREAT BASIN AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAS VEGAS NV
900 AM PDT SUN JUL 19 1998

SYNOPSIS...THE UPPER LEVEL HIGH PRESSURE SYSTEM JUST NORTHEAST OF LAS
VEGAS WILL MOVE SLOWLY EAST TOWARD THE 4-CORNERS AREA BY MONDAY.
THIS WILL ALLOW FOR A GRADUAL INCREASE IN MONSOONAL MOISTURE ACROSS
THE MOJAVE DESERT AND SOUTHERN GREAT BASIN LEADING TO A BETTER CHANCE
OF LATE DAY THUNDERSTORMS EARLY THIS WEEK.

DISCUSSION...MID AND UPPER LEVEL MOISTURE HAD INCREASED CONSIDERABLY
ACROSS THE CWA OVER THE LAST 24 HOURS PER WATER VAPOR LOOP. 12Z DRA
SOUNDING REFLECTED THIS INCREASE AS WELL AS AN INCREASE IN LOW LEVEL
MOISTURE...WHICH WAS SURGING NORTH ALONG THE COLORADO RIVER VALLEY.
INVERTED-V TYPE PROFILE WILL LEAVE THE REGION SUSCEPTIBLE TO STRONG
DOWNBURST WINDS FROM THE THUNDERSTORMS WHICH DEVELOP THIS AFTERNOON
AND EVENING. WILL CONTINUE WITH SCATTERED COVERAGE ACROSS MOST OF
MOHAVE COUNTY WHERE CAPES RISE TO AS MUCH AS 1000 J/KG LATER THIS
AFTERNOON AND LIFTED INDICES DROP TO -2. WITH INSTABILITY AND LOW
LEVEL MOISTURE ONLY MARGINAL ACROSS A GOOD PORTION OF SOUTHERN
NEVADA...WILL LEAVE POPS IN THE ISOLATED CATEGORY...MAINLY OVER THE
MOUNTAINS. CURRENT FORECAST LOOKS IN GOOD SHAPE. NO CHANGES NEEDED AT
THIS TIME.

LAS 111. MATUSIEWICZ

Flash Flood Warnings in Nevada, 1998Every flash flood warning in 1998

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.