Severe Thunderstorm Warning 5, NWS Las Vegas, NV

Issued

Jul 20, 1998, 12:53 AM MST (07:53 UTC)

Expired

Jul 20, 1998, 1:50 AM MST

In force

57 min

Issued by

NWS Las Vegas, NV

Area

Whole counties

Counties Mohave County, AZ, Clark County, NV

000 
TTAA00 KLAS 200754 RRA
SVRLAS
AZC015-CAC071-NVC003-200850-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
1253 AM PDT (1253 AM MST) MON JUL 20 1998


*  SEVERE THUNDERSTORM WARNING FOR
   SOUTHERN CLARK COUNTY IN SOUTHERN NEVADA
   WEST CENTRAL AND SOUTHWESTERN MOHAVE COUNTY IN NORTHWESTERN
   ARIZONA
   EAST CENTRAL AND SOUTHEASTERN SAN BERNARDINO COUNTY IN
   SOUTHEASTERN CALIFORNIA

*  UNTIL 150 AM PDT (150 AM MST)

*  SOME LOCATIONS AFFECTED
   LAS VEGAS, LAUHLIN, BULLHEAD CITY, HENDERSON, JEAN, PRIMM,
   NEEDLES, EARP, LAKE HAVASU CITY AND THE LAKE MEAD NATIONAL
   RECREATIONS AREA.

*  AT 1250 AM SEVERE THUNDERSTORMS WERE MOVING THROUGH THE
   LAS VEGAS METROPOLITAN AREA. THESE STORMS PRODUCED GUSTS IN
   EXCESS OF 60 MPH OVER MUCH OF THE LAS VEGAS AREA WITH
   NUMEROUS REPORTS OF POWER LINES DOWN.

DAMAGING WINDS IN EXCESS OF 60 MPH ARE LIKELY WITH THIS STORM.

WHEN THUNDERSTORMS ARE OCCURRING... PEOPLE SHOULD MOVE INSIDE A
STRONG BUILDING. DO NOT STAND BY WINDOWS. DO NOT USE TELEPHONES OR
ELECTRICAL APPLIANCES UNLESS IN AN EMERGENCY UNTIL THE STORM HAS
PASSED. MOTORISTS SHOULD NOT DRIVE INTO LOW WATER CROSSINGS.

KOSIER

NWS Las Vegas, NV wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 19, 2:11 AM MST, 22 hours 42 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

Severe Thunderstorm Warnings in Arizona, 1998Severe Thunderstorm Warnings in Nevada, 1998Every severe thunderstorm 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.