Flash Flood Warning 2, NWS Las Vegas, NV

Issued

Jul 8, 1999, 5:00 AM PDT (12:00 UTC)

Expired

Jul 8, 1999, 7:00 AM PDT

In force

2 hr

Issued by

NWS Las Vegas, NV

Area

Whole counties; the outline is the Mesonet’s reconstruction

Counties Mohave County, AZ, Clark County, NV, Lincoln County, NV

000 
TTAA00 KVEF 081203
FFWLAS
AZC015-NVC003-017-081400-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
500 AM PDT THU JUL 8 1999

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTH CENTRAL MOHAVE COUNTY IN NORTHWEST ARIZONA
  NORTHEASTERN CLARK COUNTY IN SOUTHERN NEVADA
  THIS INCLUDES THE FOLLOWING LOCATIONS...MOAPA
  SOUTHEASTERN LINCOLN COUNTY IN SOUTHERN NEVADA
  THIS INCLUDES THE FOLLOWING LOCATION...BEAVER DAM

* UNTIL 700 AM PDT(700 AM MST)

* AT 455 AM PDT(455 AM MST)...NATIONAL WEATHER SERVICE DOPPLER       
  RADAR INDICATED HEAVY RAIN 23 MILES NORTH OF MOAPA...MOVING        
  NORTHEAST AT 20 MPH. THESE STORMS ARE PRODUCING BETWEEN 1.5 AND    
  3.0 INCHES OF RAIN PER HOUR.

* THE STRONGEST STORMS WERE LOCATED OVER THE MORMON MOUNTAINS. THESE 
  HEAVY RAINS WILL CAUSE FLOODING OF TRIBUTARIES ASSOCIATED WITH THE 
  MEADOW VALLEY AND SOUTH FORK OF THE TUQUOP WASHES. FLOWS           
  ASSOCIATED WITH THE MEADOW VALLEY WASH ARE EXPECTED TO MOVE SOUTH  
  INTO NORTHEAST CLARK COUNTY BY 645 AM PDT.

* THUNDERSTORMS OVER FAR NORTHWEST MOHAVE COUNTY ARE                 
  DISSIPATING...BUT A THREAT OF FLOODING ON THE GRAND WASH STILL     
  EXISTS UNTIL THE STORMS HAVE COMPLETELY DISSIPATED. THUS...A FLASH 
  FLOOD WARNING IS IN EFFECT FOR FAR NORTHWEST MOHAVE COUNTY AS WELL.

* A FLASH FLOOD WARNING MEANS THAT FLOODING IS ALREADY OCCURRING OR  
  IS IMMINENT IN THE WARNING AREA. STAY TUNED TO NOAA WEATHER RADIO  
  OR LOCAL MEDIA OUTLETS FOR THE LATEST SEVERE WEATHER INFORMATION   
  FROM THE NATIONAL WEATHER SERVICE.

LAT...LON 3703 11465 3662 11466 3661 11405 3614 11406 3627 11375     
      3700 11349 3789 11375

NWS Las Vegas, NV wrote its last area forecast discussion before this flash flood warning went out at Jul 8, 4:25 AM PDT, 35 minutes earlier.

MOJAVE DESERT/SOUTHERN GREAT BASIN AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAS VEGAS NV
425 AM PDT THU JUL 8 1999

SYNOPSIS...HIGH PRESSURE CENTERED OVER COLORADO WILL MOVE OVER THE
DESERT SOUTHWEST BY THIS WEEKEND. THE AIR MASS WILL REMAIN
SUFFICIENTLY MOIST AND UNSTABLE FOR AFTERNOON AND EVENING
THUNDERSTORMS. DAYTIME TEMPERATURES WILL BE NEAR OR SLIGHTLY BELOW
NORMAL.

DISCUSSION...THUNDERSTORMS WITH VERY HEAVY RAIN HAVE DEVELOPED OVER
PORTIONS OF SOUTH-CENTRAL AND EXTREME SOUTHERN NEVADA THIS
MORNING...PRODUCING RAINFALL OF 1.5 TO 3.0 INCHES PER HOUR. THUS...
HAVE ISSUED A FLASH FLOOD WATCH FOR MUCH OF THE CWA EXCEPT FOR THE
FAR NORTHWEST PORTIONS.

BASED ON MODEL AND PLOT DATA...A SOLID SYNOPTIC-SCALE FOCUS FOR
ORGANIZED THUNDERSTORMS IS LACKING THIS AFTERNOON AND EVENING...
EXCEPT FOR THE DEFORMATION ZONE CURRENTLY DRAPED OVER SOUTHERN NEVADA
BETWEEN THE EASTERLY WAVE OVER SOUTHERN CALIFORNIA AND THE WESTERLY
FLOW OVER NORTHERN NEVADA THIS MORNING. AS THE EASTERLY WAVE MOVES
WEST TODAY...I SUSPECT THIS FORCING WILL DECREASE. HOWEVER...WE WILL
HAVE MORE SUNSHINE TO WORK WITH THAN YESTERDAY. THIS WILL GIVE WAY TO
VERY EFFICIENT RAIN-PRODUCING STORMS TODAY GIVEN THE VERY MOIST STATE
OF THE AIRMASS OVER SOUTHERN NEVADA...SOUTHEAST CALIFORNIA AND
NORTHWEST ARIZONA.

MODELS DIFFER WITH THE PLACEMENT OF THE HIGH CENTER AND THIS IS THE
MAIN POINT OF CONTENTION BETWEEN THE MODELS. HOWEVER...THE POINT IS
MOOT AS THE MOIST STATE OF THE AIRMASS WILL LEAD TO THUNDERSTORM
DEVELOPMENT OVER JUST ABOUT ALL OF THE CWA.

A PERSISTENCE FORECAST IN THE EXTENDED PERIOD IS THE SAFEST BET GIVEN
THE MODEL UNCERTAINTY OF THE RIDGE POSITION. JAH

.LAS...A FLASH FLOOD WATCH HAS BEEN ISSUED. PLEASE REFER TO THE
LATEST RNOFFALAS STATEMENT FOR DETAILS.

Flash Flood Warnings in Nevada, 1999Flash Flood Warnings in Arizona, 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.