Alert archive / Nevada / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 3, NWS Las Vegas, NV

September 4, 1987Clark County, Nevada

NWS Las Vegas, NV issued this severe thunderstorm warning at Sep 4, 1987, 5:30 PM PDT for Clark County, Nevada. It was in force for 60 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Sep 4, 1987, 5:30 PM PDT (00:30 UTC)
Expired
Sep 4, 1987, 6:30 PM PDT
In force
60 min
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.

What was reported inside it

TimeReportWhereRemark
Sep 4, 6:00 PM PDTThunderstorm Wind 52Clark, NV

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Mercury/Desert R, NV (KDRA), launched 00:00Z, 0.5 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 1987-09-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 21 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 1987-09-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -2 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
21 J/kg
Mixed-layer CIN
-40 J/kg
Mixed-layer LCL
3558 m above ground
0-6 km bulk shear
2 kt
0-1 km storm-relative helicity
-2 m²/s²
0-3 km storm-relative helicity
-35 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 050030
SVRLAS
AZC015-NVC003-050130-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LAS VEGAS NV
530 PM PDT FRI SEP 4 1987
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL  630 PM PDT FOR PEOPLE IN THE FOLLOWING COUNTIES...
 
IN NORTHWEST ARIZONA
          ...EXTREME NORTHWEST  MOHAVE
IN SOUTHERN  NEVADA
          ...SOUTHEASTERN CLARK
 
THE SEVERE THUNDERSTORM WARNING INCLUDES THE TOWNS OF SEARCHLIGHT
AND LAUGHLIN..NEVADA. THIS ALSO INCLUDES LAKE MEAD AND LAKE MOHAVE.
THIS WARNING DOES NOT INCLUDE THE GREATER LAS VEGAS AREA.
 
RADAR SHOWS A LINE OF THUNDERSTORMS FROM CENTRAL LAKE MEAD SOUTHWEST
TO SEARCHLIGHT.  THE LINE WAS PRODUCING HEAVY RAIN AND GUSTY WINDS
OVER 45 MPH.  IT WILL AFFECT BOATERS ON LAKE MOHAVE AND LAKE MEAD
AS WELL AS RESIDENTS OF EXTREME SOUTHEAST CLARK COUNTY FOR THE
NEXT HOUR.
 
 
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.

What forecasters said that day

The local office's own words before this severe thunderstorm 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 4, 3:35 PM PDT, 1 hour 55 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LAS VEGAS, NV
335 PM PDT FRI SEP 04 1987

...THUNDERSTORMS DEVELOPING OVER SOUTHERN NEVADA...

AT 315 PM WEATHER RADAR IN LAS VEGAS SHOWED A RAPID INCREASE IN
THUNDERSTORMS OVER THE SOUTHERN HALF OF NEVADA.  SOME OF THE STORMS
WERE MODERATE TO HEAVY IN INTENSITY.  MOVEMENT WAS NORTHEAST AT 20 MPH.

SCATTERED THUNDERSTORMS ARE LIKELY DURING THE NEXT FEW HOURS OVER
MOST OF SOUTHERN NEVADA INCLUDING THE LAS VEGAS AREA.

DANGEROUS LIGHTNING...GUSTY WINDS TO 40 MPH AND BRIEF HEAVY RAIN IS
POSSIBLE THIS EVENING.  BOATERS ON LAKE MEAD ARE REMINDED A LAKE WIND
ADVISORY HAS BEEN PUT INTO EFFECT FOR THIS EVENING DUE TO GUSTY WINDS
AROUND THUNDERSTORM6S.  SKIES SHOULD CLEAR LATER TONIGHT.

STAY TUNED TO THIS STATION FOR LATER STATEMENTS.
SDB/2235Z
Local storm report, Sep 4, 4:59 PM PDT, 31 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS, NV
457 PM PDT FRI SEP 04 1987

TIME                      EVENT
415 PM PDT                SPOTTER IN HENDERSON, NV REPORTS WIND GUSTS
                          TO 58 MPH.  ALSO.. 0.04 INCHES RAIN IN 40 MIN.

420 PM PDT                HENDERSON POLICE AND NEVADA HIGHWAY PATROL
                          REPORT INTERSECTION OF SUNSET AND BOULDER
                          HIGHWAY FLODDED AND IMPASSABLE..CREWS ON THE
                          SCENE.  ALSO..HAIL REPORTED IN THE GREEN
                          VALLEY AREA.

Nearby

Severe Thunderstorm Warnings in Nevada, 1987Every severe thunderstorm warning in 1987

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.