Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 49, NWS Amarillo, TX

July 7, 1987Texas County, Oklahoma; Hansford County, Texas

NWS Amarillo, TX issued this severe thunderstorm warning at Jul 7, 1987, 7:50 PM CDT for Texas County, Oklahoma; Hansford County, Texas. It was in force for 55 min.

The area

The counties it named.

The facts

Issued
Jul 7, 1987, 7:50 PM CDT (00:50 UTC)
Expired
Jul 7, 1987, 8:45 PM CDT
In force
55 min
Issued by
NWS Amarillo, TX
Area
Whole counties

Counties Texas County, OK, Hansford County, TX

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

Amarillo Airport, TX (KAMA), launched 00:00Z, 0.8 hours before the alert went out and 145 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, Amarillo Airport, TX at 00:00Z on 1987-07-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2614 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, Amarillo Airport, TX at 00:00Z on 1987-07-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 87 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
2614 J/kg
Mixed-layer CIN
-42 J/kg
Mixed-layer LCL
2400 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
87 m²/s²
0-3 km storm-relative helicity
264 m²/s²
Significant tornado parameter
0.0
Supercell composite
11.4

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KAMA 080050
SVRAMA
OKC139-TXC195-080145-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AMARILLO TX
750 PM CDT TUE JUL 7 1987
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL  845 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES...
 
IN THE OKLAHOMA PANHANDLE
          ...SOUTHEASTERN TEXAS
IN THE TEXAS PANHANDLE
          ...HANSFORD
 
AT 734 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM MOVING INTO
HANSFORD COUNTY AND ANOTHER IN SOUTH CETRAL TEXAS COUNTY OF THE
OKLAHOMA PANHANDLE. THESE STORMS WERE MOVING EAST AT 20 MILES
AN 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.
 
THIS IS A DANGEROUS STORM.  IF YOU ARE IN ITS PATH YOU SHOULD
PREPARE FOR DAMAGING WIND IN EXCESS OF 55 MPH...LARGE HAIL...AND
DEADLY LIGHTNING.  PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT STAY AWAY FROM WINDOWS.

The office that day

Everything else NWS Amarillo, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 7, 8:30 PM CDTSevere Thunderstorm WarningAMAHutchinson60 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 1987Severe Thunderstorm Warnings in Texas, 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; the sounding from the Mesonet's radiosonde archive.