Alert archive / Nevada / Flash Flood Warnings in 1990

Flash Flood Warning 9, NWS Las Vegas, NV

July 14, 1990Clark County, Nevada

NWS Las Vegas, NV issued this flash flood warning at Jul 14, 1990, 11:07 PM PDT for Clark County, Nevada. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Jul 14, 1990, 11:07 PM PDT (06:07 UTC)
Expired
Jul 15, 1990, 2:15 AM PDT
In force
3 hr
Issued by
NWS Las Vegas, NV
Area
Whole counties

County Clark County, NV

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Mercury/Desert R, NV (KDRA), launched 00:00Z, 6.1 hours before the alert went out and 99 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 00:00Z on 1990-07-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 20 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 00:00Z on 1990-07-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 5 square meters per square second.193958Sfc1 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
20 J/kg
Mixed-layer CIN
-368 J/kg
Mixed-layer LCL
2607 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
5 m²/s²
0-3 km storm-relative helicity
69 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 150608
FFWLAS
AZC015-NVC003-150915-
 
BULLETIN - EBS ACTIVATION REQUESTED
SEVERE THUNDERSTORM AND FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
1107 PM PDT SAT JUL 14 1990
 
THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A
SEVERE THUNDERSTORM AND FLASH FLOOD WARNING
EFFECTIVE UNTIL  215 AM PDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...S...
 
IN NORTHWEST ARIZONA
 
   ...NORTHWESTERN MOHAVE COUNTY
 
 
IN SOUTH NEVADA
 
   ...CLARK COUNTY
 
LAS VEGAS RADAR AND SATELLITE SHOWED A LARGE AREA OF THUNDERSTORMS
CONTINUING TO MOVE SOUTHEAST ACROSS ALL OF CLARK COUNTY.
 
WEATHER SPOTTERS AND REMOTE RAIN GUAGES INDICATE THAT STRONG WINDS
IN EXCESS OF 50 MPH ALONG WITH HEAVY RAIN ACCOMPANY THESE STORMS.
 
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS.  HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 14, 9:42 PM PDTFlash Flood WarningVEFClark, Nye2 hr
Jul 14, 9:42 PM PDTSevere Thunderstorm WarningVEFClark, Nye2 hr
Jul 14, 11:07 PM PDTSevere Thunderstorm WarningVEFClark3 hr

Nearby

Flash Flood Warnings in Nevada, 1990Every flash flood warning in 1990

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.