Flash Flood Warning 6, NWS Las Vegas, NV

Issued

Jul 8, 1999, 9:34 AM PDT (16:34 UTC)

Expired

Jul 8, 1999, 12:30 PM PDT

In force

3 hr

Issued by

NWS Las Vegas, NV

Area

Whole counties

County Esmeralda County, NV

The San Joaquin Valley radar (KHNX), 241 km from the middle of the area, began a volume at 16:40 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

000 
TTAA00 KLAS 081635
FFWLAS
NVC003-009-081935-

FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
934 AM PDT THU JUL 8 1999

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EXTREME SOUTHERN SOUTHERN NEVADA
  EXTREME WESTERN CLARK CLARK COUNTY
  THIS INCLUDES THE FOLLOWING LOCATIONS...PAHRUMP AND AMARGOSA VALLEY

* UNTIL 1230 PM PDT

* AT 920 AM PDT...DOPPLER RADAR INDICATED SHOWERS AND THUNDERSTORMS
  FROM AMARGOSA VALLEY TO JUST EAST OF PAHRUMP.  THESE STORMS WERE
  PRODUCING RAINFALL RATES UP TO 2.0 INCHES PER HOUR.

* THE RUNOFF FROM THESE STORMS WILL AFFECT AND CAUSE FLOODING
  ON WASHES AND ROADS IN THE ABOVE AREA INCLUDING HIGHWAY 160.
  THE RAIN WAS PRODUCING MINOR STREET FLOODING IN PAHRUMP AT AROUND
  900 AM AND WITH RAINFALL CONTINUING...CONDITIONS ARE EXPECTED TO
  WORSEN THROUGH THE MORNING.

* 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.

NWS Las Vegas, NV wrote its last area forecast discussion before this flash flood warning went out at Jul 8, 4:25 AM PDT, 5 hours 9 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, 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; radar from the NEXRAD Level II archive.