Alert archive / Nevada / Flash Flood Warnings in 1990
Flash Flood Warning 20, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Sep 18, 1990, 2:45 PM PDT for Clark County, Nevada. It was in force for 2 hr.
The area
The counties it named.
The facts
- Issued
- Sep 18, 1990, 2:45 PM PDT (21:45 UTC)
- Expired
- Sep 18, 1990, 4:45 PM PDT
- In force
- 2 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 12:00Z, 9.8 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 3265 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- -18 m²/s²
- 0-3 km storm-relative helicity
- 54 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KLAS 182146 FFWLAS NVC003-182345- BULLETIN - EBS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE LAS VEGAS NV 245 PM PDT TUE SEP 18 1990 THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 445 PM PDT FOR PEOPLE IN THE FOLLOWING LOCATIONS...... IN SOUTH NEVADA ...NORTHEASTERN CLARK COUNTY THE AUTOMATIC RAIN GAGE AT CALIFORNIA WASH IN NORTHEAST CLARK COUNTY HAS RECORDED ALMOST AN INCH OF RAIN IN 30 MINUTES. CALIFORNIA WASH EMPTIES INTO THE MUDDY RIVER AT MOAPA. THE TOWNS OF GLENDALE AND MOAPA ARE INCLUDED IN THE WARNING AREA...INCLUDING THAT PORTION OF INTERSTATE 15. A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS IMMINENT. MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS BRIDGES...DIPS...OR LOW SPOTS IF WATER COVERS THE ROADWAY. NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL ONE...ON FOOT. TO ESCAPE RISING WATER MOVE UP TO HIGHER GROUND. DJR/2146Z
What forecasters said that day
The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Special weather statement, Sep 18, 1:15 PM PDT, 1 hour 30 minutes before
NVZ008-009-190000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 115 PM PDT TUE SEP 18 1990 ...THUNDERSTORMS DEVELOPING OVER SOUTHERN NEVADA... AT 1PM PDT WEATHER RADAR AND LIGHTNING DETECTION SENSORS SHOWED THAT THUNDERSTORMS WERE DEVELOPING OVER SOUTHERN NEVADA AND NORTHWEST ARI- ZONA. THE THUNDERSTORMS WERE MOVING SLOWLY TO THE NORTH. MOST OF THE THUNDERSTORMS WERE OVER LINCOLN COUNTY AND NORTHERN CLARK COUNTY. A THUNDERSTORM OVER NORTHWEST ARIZONA WAS LOCATED SOUTH OF TEMPLE BAR IN THE LAKE MEAD RECREATION AREA. SOME OF THE THUNDERSTORMS MAY PRODUCE HEAVY RAIN...STRONG GUSTY WINDS ...DEADLY LIGHTNING AND HAIL. LOCAL FLOODING OF LOW LYING AREAS AND NORMALLY DRY WASHES IS POSSIBLE THIS AFTERNOON. MOTORISTS ARE REMINDED THAT MOST PEOPLE KILLED BY FLASH FLOODS DIE IN THEIR CARS WHILE TRYING TO CROSS FLOODED AREAS. NEVER ATTEMPT TO CROSS A FLOODED ROADWAY...EITHER ON FOOT OR IN YOUR CAR. GUSTY WINDS ASSOCIATED WITH THUNDERSTORMS WILL CAUSE LOCAL AREAS OF BLOWING DUST AND SAND WHICH WILL REDUCE VISIBILITIES AT TIMES. IF LIGHTNING IS NEARBY TAKE SHELTER INDOORS OR IN YOUR CAR. IF YOU ARE CAUGHT OUTSIDE...AVOID HIGH GROUND...HIGH TREES OR TALL METAL STRUCTURES. GET OFF SMALL BOATS...OR OUT OF THE WATER IF YOU ARE SWIMMING. PERSONS ENGAGED IN OUTDOOR ACTIVITIES IN SOUTHERN NEVADA TODAY SHOULD KEEP AN EYE ON THE SKY AND BE PREPARED TO TAKE NECESSARY PRECAUTIONS IF THUNDERSTORMS MOVE INTO YOU R AREA. LISTEN TO COMMERCIAL RADIO...TELEVISION OR NOAA WEATHER RADIO FOR THE LATEST WEATHER INFORMATION. DJR/2015Z
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.