Alert archive / Alabama / Severe Thunderstorm Warnings in 1989

Severe Thunderstorm Warning 93, NWS Mobile, AL

June 20, 1989Houston County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Jun 20, 1989, 12:55 PM CDT for Houston County, Alabama. It was in force for 65 min.

The area

The counties it named.

The facts

Issued
Jun 20, 1989, 12:55 PM CDT (17:55 UTC)
Expired
Jun 20, 1989, 2:00 PM CDT
In force
65 min
Issued by
NWS Mobile, AL
Area
Whole counties

County Houston County, AL

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

Apalachicola Mun, FL (KAQQ), launched 12:00Z, 5.9 hours before the alert went out and 161 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, Apalachicola Mun, FL at 12:00Z on 1989-06-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 579 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, Apalachicola Mun, FL at 12:00Z on 1989-06-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 33 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
579 J/kg
Mixed-layer CIN
-32 J/kg
Mixed-layer LCL
1085 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
33 m²/s²
0-3 km storm-relative helicity
37 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 KMGM 201758
SVRMGM
ALC069-201900-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MONTGOMERY AL
1255 PM CDT TUE JUN 20 1989
 
THE NATIONAL WEATHER SERVICE IN MONTGOMERY HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  200 PM CDT
FOR PEOPLE IN THE FOLLOWING COUNTY...
 
IN SOUTH ALABAMA
          ...HOUSTON
 
AT 1250PM CDT WEATHER RADAR AT MONTGOMERY SHOWED SEVERE THUNDERSTORMS
ON THE ALABAMA FLORIDA LINE ABOUT TO ENTER HOUSTON COUNTY SOUTH OF
COTTONWOOD. THESE STORMS ARE MOVING TOWARD THE NORTHEAST AT ABOUT
20 MILES AN HOUR AND WILL PASS THROUGH THE SOUTHEAST PART OF HOUSTON
COUNTY.
 
 
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 ROADi.

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, Jun 20, 10:46 AM CDT, 2 hours 9 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE PENSACOLA FL
1035 AM CDT MON JUN 19 1989

...THUNDERSTORMS WITH VERY HEAVY RAIN WERE OVER NORTHWEST FLORIDA AND
THE COASTAL WATERS...

AT 1030 AM CDT...THUNDERSTORMS...SOME WITH VERY HEAVY RAINS AND GUSTY
WINDS...WERE OVER THE FLORIDA PANHANDLE AND THE ADJOINING COASTAL
WATERS.
THE THUNDERSTORMS WITH THE HEAVIER RAINS WERE ALONG THE COAST FROM EAST
OF PENSACOLA TO AROUND DESTIN...NEAR MILTON...AND NEAR DE FUNIAK
SPRINGS.
THE THUNDERSTORMS WERE MOVING EAST-NORTHEAST AT 20 MILES AN HOUR.

OTHER THUNDERSTORMS...A FEW WITH HEAVY RAIN...WERE SCATTERED OVER THE
FLORIDA PANHANDLE...SOUTH ALABAMA...AND OVER THE GULF TO 100 MILES FROM
PASCAGOULA MISSISSIPPI TO PORT ST JOE FLORIDA.

THE THUNDERSTORMS WILL PRODUCE HEAVY DOWNPOURS CAUSING SOME STREET
AND POOR DRAINAGE AREA FLOODING...FREQUENT LIGHTNING...POSSIBLE SMALL
HAIL...GUSTY WINDS AND ROUGH SEAS...ALSO CONDITIONS MrAY FAVOR THE
DEVELOPMENT OF WATERSPOUTS FOR THE NEXT FEW HOURS.
PERSONS SHOULD TAKE ANY NECESSARY PRECAUTIONS FOR THESE CONDITIONS.

The office that day

Everything else NWS Mobile, AL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 20, 12:37 PM CDTFlash Flood WarningMOBElmore, Tallapoosa2 hr
Jun 20, 12:37 PM CDTFlash Flood WarningMOBMontgomery2 hr

Nearby

Severe Thunderstorm Warnings in Alabama, 1989Every severe thunderstorm warning in 1989

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.