Alert archive / Arizona / Flash Flood Warnings in 1998

Flash Flood Warning 13, NWS Las Vegas, NV

July 22, 1998Mohave County, Arizona; San Bernardino County, California

NWS Las Vegas, NV issued this flash flood warning at Jul 22, 1998, 2:55 PM MST for Mohave County, Arizona; San Bernardino County, California. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jul 22, 1998, 2:55 PM MST (21:55 UTC)
Expired
Jul 22, 1998, 5:00 PM MST
In force
2 hr
Issued by
NWS Las Vegas, NV
Area
Whole counties

Counties Mohave County, AZ, San Bernardino County, CA

The nearest sounding before it

Mercury/Desert R, NV (KDRA), launched 12:00Z, 9.9 hours before the alert went out and 176 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Mercury/Desert R, NV at 12:00Z on 1998-07-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 135 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Mercury/Desert R, NV at 12:00Z on 1998-07-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 17 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
135 J/kg
Mixed-layer CIN
-183 J/kg
Mixed-layer LCL
1158 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
17 m²/s²
0-3 km storm-relative helicity
22 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KLAS 222157
FFWLAS
AZC015-CAC071-230000-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
255 PM PDT (255 PM MST) WED JUL 22 1998


*  FLASH FLOOD WARNING FOR
   SOUTHWESTERN MOHAVE COUNTY IN NORTHWESTERN ARIZONA
   EXTREME EASTERN SAN BERNARDINO COUNTY IN SOUTHEASTERN CALIFORNIA

*  UNTIL 500 PM MST (500 PM PDT)

*  SOME LOCATIONS AFFECTED
   LAKE HAVASU CITY
   LAKE HAVASU STATE PARK
   PARKER DAM CALIFORNIA

DOPPLER RADAR DETECTED A SEVERE THUNDERSTORM ACCOMPANIED BY VERY
HEAVY RAIN NEAR PARK DAM ALONG THE ARIZONA/CALIFORNIA STATE LINE.
MOVEMENT IS TO THE NORTHWEST AT LESS THEN 10 MPH.

MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT ATTEMPT TO
CROSS BRIDGES... DIPS... OR LOW WATER CROSSINGS IF WATER COVERS
THE ROADWAY. NEVER TRY TO CROSS A FLOWING STREAM... EVEN A SMALL
ONE... ON FOOT. TO ESCAPE RISING WATER MOVE TO HIGHER GROUND. DO
NOT DRIVE AROUND BARRICADES.

PIERCE

The office that day

Everything else NWS Las Vegas, NV issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 21, 5:33 PM MSTSevere Thunderstorm WarningVEFMohave62 min
Jul 21, 6:52 PM MSTSevere Thunderstorm WarningVEFMohave88 min
Jul 21, 6:21 PM MSTSevere Thunderstorm WarningVEFSan Bernardino64 min

Nearby

Flash Flood Warnings in Arizona, 1998Flash Flood Warnings in California, 1998Every flash flood warning in 1998

Sources

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.