Flash Flood Warning 5, NWS Las Vegas, NV

Issued

Jul 25, 2003, 11:12 AM PDT (18:12 UTC)

Expired

Jul 25, 2003, 2:15 PM PDT

In force

3 hr

Issued by

NWS Las Vegas, NV

Area

Counties, with a storm outline in the text

County Clark County, NV

The Las Vegas radar (KESX), 26 km from the middle of the area, began a volume at 18:12 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.

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this flash flood warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

000 
WGUS55 KVEF 251816
FFWVEF
NVC003-252115-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
1112 AM PDT FRI JUL 25 2003

THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL CLARK COUNTY IN SOUTHERN NEVADA

* UNTIL 215 PM PDT

* AT 1110 AM PDT...SKYWARN WEATHER SPOTTERS REPORTED VERY HEAVY      
  RAIN IN GREEN VALLEY WITH WATER BEGINNING TO FLOOD SOME ROADWAYS.

SHOWERS AND THUNDERSTORMS ARE WIDESPREAD ACROSS SOUTHERN CLARK 
COUNTY FROM THE CLARK COUNTY LINE NORTHWARD INTO HENDERSON AND GREEN 
VALLEY.  THE STORMS ARE PRODUCING HEAVY...FLOODING RAINS AND WILL 
CONTINUE THROUGH 1 PM PDT...WITH FLOODING RUNOFF CONTINUING 
THROUGHOUT THE AFTERNOON.

NEVER DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS 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.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
TAKE IMMEDIATE PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT
ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY
FOOT OR BY AUTOMOBILE. IF YOUR VEHICLE STALLS...ABANDON IT AND SEEK
HIGHER GROUND.

LAT...LON 3565 11541 3534 11479 3614 11488 3611 11534

NWS Las Vegas, NV wrote its last area forecast discussion before this flash flood warning went out at Jul 25, 10:00 AM PDT, 1 hour 12 minutes earlier.

MOJAVE DESERT/SOUTHERN GREAT BASIN AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAS VEGAS NV
1000 AM PDT FRI JUL 25 2003

.SYNOPSIS...MOIST SOUTHERLY FLOW AND AN UNSTABLE ATMOSPHERE TODAY
WILL ALLOW SCATTERED THUNDERSTORMS TO DEVELOP OVER THE REGION. SOME
OF THESE STORMS WILL CONTAIN VERY HEAVY RAIN. THE MOIST SOUTHERLY
FLOW WILL CONTINUE INTO THE MOJAVE DESERT AND SOUTHERN GREAT BASIN
THROUGH THE WEEKEND AS HIGH PRESSURE MIGRATES FROM COLORADO BACK
WEST INTO EAST CENTRAL NEVADA SUNDAY. TEMPERATURE WILL WARM SEVERAL
DEGREES BY SUNDAY.

.DISCUSSION...WATER VAPOR IMAGERY THIS MORNING SHOWS THE SOUTHERLY
FLOW FROM AROUND THE HIGH CENTER OVER EASTERN COLORADO CONVERGING
WITH THE FLOW AROUND A WEAK UPPER TROUGH JUST OFF THE CALIFORNIA
COAST. MOIST CONVERGENCE ZONE AND DEEP SOUTHERLY FLOW ARE STRETCHING
FROM CLARK COUNTY ALL THE WAY DOWN TO BAJA CALIFORNIA. ATMOSPHERE IS
ALREADY MOIST WITH 1.10 PW OFF THE KDRA SOUNDING THIS MORNING AND
THE PW SENSOR AT MCCARRAN AT AN ALMOST 1.5. DEWPOINTS ALONG THE
COLORADO RIVER ARE ALREADY IN THE UPPER 60S. RADAR THIS MORNING
SHOWS THUNDERSTORMS CONTINUING TO DEVELOP ALONG THIS ZONE IN A NORTH
TO SOUTH ORIENTATED LINE. THESE STORMS WILL MOVE NORTH...BUT ENTRAIN
ONE AFTER ANOTHER. THE MAIN THREAT WILL BE FLASH FLOODING. A FLASH
FLOOD WATCH WAS ISSUED EARLIER TODAY EFFECTIVE UNTIL 9PM.

.LAS...FLASH FLOOD WATCH UNTIL 9 PM ALL ZONES.

OROW

AZZ001>003-036-CAZ026>029-NVZ013>022-261200-

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE LAS VEGAS NV
930 AM PDT FRI JUL 25 2003

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST CALIFORNIA/SOUTHERN
NEVADA/NORTHWEST ARIZONA

...FLASH FLOOD WATCH IN EFFECT UNTIL 9 PM THIS EVENING...

.DAY ONE...TODAY

THUNDERSTORMS WILL INCREASE IN COVERAGE ACROSS THE AREA THIS
AFTERNOON. THE COMBINATION OF HEAVY RAINFALL FROM INDIVIDUAL STORMS
AND THE POTENTIAL FOR MULTIPLE STORMS TO MOVE ACROSS THE SAME
LOCATION HAS REQUIRED THE ISSUANCE OF A FLASH FLOOD WATCH. THE
HIGHEST POTENTIAL FOR FLASH FLOODING EXISTS ACROSS SAN BERNARDINO
COUNTY...EASTERN INYO COUNTY...CLARK COUNTY...AND SOUTHERN NYE
COUNTY.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. MOISTURE
WILL CONTINUE TO CIRCULATE ACROSS THE MOJAVE DESERT AND SOUTHERN
GREAT BASIN THROUGH THE PERIOD. ISOLATED TO SCATTERED
THUNDERSTORMS WILL CONTINUE FOR PARTS OF THE REGION.

.SPOTTER INFORMATION STATEMENT...

SKYWARN SPOTTER ACTIVATION WILL LIKELY BE NEEDED THIS AFTERNOON.

Flash Flood Warnings in Nevada, 2003Every flash flood warning in 2003

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.