Alert archive / Alabama / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 142, NWS Birmingham, AL

August 20, 1990Bibb County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Aug 20, 1990, 4:34 PM CDT for Bibb County, Alabama. It was in force for 26 min.

The area

The counties it named.

The facts

Issued
Aug 20, 1990, 4:34 PM CDT (21:34 UTC)
Expired
Aug 20, 1990, 5:00 PM CDT
In force
26 min
Issued by
NWS Birmingham, AL
Area
Whole counties

County Bibb 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

Centreville/Bibb, AL (KCKL), launched 12:00Z, 9.6 hours before the alert went out and 13 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, Centreville/Bibb, AL at 12:00Z on 1990-08-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Centreville/Bibb, AL at 12:00Z on 1990-08-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 16 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
0 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
16 m²/s²
0-3 km storm-relative helicity
13 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 KBHM 202136
SVRBHM
ALC007-202200-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
434 PM CDT MON AUG 20 1990
 
THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  500 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN NORTH ALABAMA
 
   ...BIBB COUNTY
 
AT 430 PM CDT WEATHER SERVICE RADAR INDICATED A SEVERE THUNDERSTORM
NEAR THE SHELBY-BIBB COUNTY LINE. THE STORM IS MOVING TOWARD THE
SOUTHWEST AT 10 TO 15 MPH AND WILL AFFECT THE TOWNS OF BRIERFIELD AND
ASHBY IN EASTERN BIBB COUNTY WITHIN THE NEXT HALF HOUR.
 
IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER FROM THE WEATHER IN A
STRONG BUILDING.  DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN...
AND DEADLY LIGHTNING ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS.
STAY INSIDE AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.

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

Local storm report, Aug 20, 12:13 PM CDT, 4 hours 21 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1215 PM CDT MON AUG 20 1990

...DELAYED STORM REPORTS FOR AUGUST 19 1990...

THESE EVENTS OCCURRED AROUND 5 PM AT UNION GROVE CLOSE TO THE JEMISON EXIT.
ON I 65.

    ...21 ACRES OF APPLE TREES WERE HEAVILY DAMAGED BY WINDS
       AS WELL AS ROOF BLOWN OFF NEARBY BARN.

    ...AT KOA CAMPGROUND...ROOF OFF ADMINSTRATION BUILDING
       RESULTING IN WATER DAMAGE TO OFFICES.

    ...SEVERAL LIGHT^ POLES AND SIGN WERE BLOWN DOWN.

    NO WARNINGS WERE IN EFFECT.

INFORMATION RELAYED TO STATE EMA BY CHILTON COUNTY EMERGENCY MANAGEMENT
OFFICAL
Special weather statement, Aug 20, 1:31 PM CDT, 3 hours 3 minutes before
ALZ004>009-011-201930-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
130 PM CDT MON AUG 20 1990

SHOWERS AND A FEW THUNDERSTORMS ARE FIRING UP QUICKLY ACROSS CENTRAL
ALABAMA THIS AFTERNOON.

AT 125 PM WEATHER SERVICE RADAR AT CENTREVILLE INDICATED A BROKEN LINE
OF SHOWERS AND STORMS WHICH EXTENDED FROM NEAR COLLINSVILLE IN DE KALB
COUNTY WESTWARD INTO NORTHERN CULLMAN...WINSTON AND MARION COUNTIES.
ANOTHER STRONG STORM WAS IN CLAY COUNTY ABOUT 10 MILES EAST OF ASHLAND.

MOVEMENT OF THE STORMS WERE SLOW AND ERRATIC AND BECAUSE OF THIS...VERY
HEAVY DOWNPOURS ARE POSSIBLE RESULTING IN LARGE AMOUNTS OF RAIN IN A
SHORT TIME.  IN ADDITION TO THE HEAVY RAIN...STRONG GUSTY WINDS AND
FREQUENT LIGHTNING CAN BE EXPECTED WITH THESE STORMS.

PERSONS SHOULD MOVE INSIDE A STRONG BUILDING SHOULD THREATENING WEATHER
APPROACH.  CONTINUE TO LISTEN TO NOAA WEATHER RADIO...LOCAL TV OR RADIO
FOR LATER WEATHER UPDATES AND STATEMENTS.
Special weather statement, Aug 20, 2:04 PM CDT, 2 hours 30 minutes before
ALZ004>009-011-202000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
202 PM CDT MON AUG 20 1990

STRONG THUNDERSTORMS WERE DEVELOPING IN NORTHERN ALABAMA THIS AFTERNOON.

AT 200 PM WEATHER SERVICE RADAR AT CENTREVILLE SHOWED NUMEROUS SHOWERS
AND THUNDERSTORMS ACROSS THE NORTH HALF OF ALABAMA.  SOME OF THE STORMS
WERE QUITE STRONG.  ONE OF THE STORMS...IN CULLMAN COUNTY...PRODUCED
MARBLE SIZED HAIL...VERY STRONG GUSTY WINDS AND HEAVY DOWNPOURS AROUND
140 PM.

LIGHT TO MODERATE SHOWERS WERE WIDELY SCATTERED OVER CENTRAL ALABAMA.
WITH HOT AFTERNOON TEMPERATURES...A FEW THESE SHOWERS MAY BUILD INTO
THUNDERSTORMS WITHIN A VERY SHORT TIME.  ALABAMIANS NEED TO KEEP THIS
IN MIND THIS AFTERNOON AND BE PREPARED TO MOVE TO SAFE SHELTER IF
THREATENING WEATHER APPROACHES YOU.

CONTINUE TO LISTEN TO NOAA WEATHER RADIO...OR LOCAL NEWS MEDIA FOR LATER
WEATHER UPDATES AND STATEMENTS.
Special weather statement, Aug 20, 3:12 PM CDT, 1 hour 22 minutes before
ALZ010-011-012-014-017-018-202300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MONTGOMERY AL
315 PM CDT MON AUG 20 1990

IF YOU THINK IT HAS BEEN HOT THE LAST SEVEN DAYS...YOU ARE RIGHT...
LISTED BELOW ARE MAXIMUM TEMPERATURES AT MONTGOMERY FOR THE LAST
SEVEN DAYS AND THE LAST TIME 100 DEGREE MAXIMUMS OCCURRED FOR SEVEN
CONSECUTIVE DAYS...
1990 AUGUST 14TH 101       1954 AUGUST 11TH 101
            15TH 101                   12TH 102
            16TH 102                   13TH 101
            17TH 100                   14TH 103
            18TH 101                   15TH 101
            19TH 101                   16TH 102
            20TH 100 3PM               17TH 100

AUGUST 195_4 SHOWED 14 DAYS OF 100 OR ABOVE MAXIMUM TEMPERATURES.
SO FAR THIS AUGUST HAS PRODUCED 8 DAYS. SEVERAL OTHER PERIODS SINCE
1872 SAW 6 CONSECUTIVE DAYS WITH MAXIMUMS OF 100 OR ABOVE.
Special weather statement, Aug 20, 3:33 PM CDT, 1 hour 1 minute before
ALZ010-011-012-014-017-018-202230-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MONTGOMERY AL
330 PM CDT MON AUG 20 1990

AT 320 PM CDT WEATHER RADAR AT MONTGOMERY SHOWED STRONG THUNDERSTORMS
MOVING INTO HENRY AND HOUSTON COUNTIES ALABAMA FROM GEORGIA. THE
THUNDERSTORMS WERE IN A SHORT LINE BETWEEN FORT GAINES GEORGIA AND
AND MARIANA FLORIDA. MOVEMENT WAS WEST SOUTHWEST AT 15 MPH.

OTHER STRONG THUNDERSTORMS WERE SCATTERED OVER EAST ALABAMA FROM WADLEY
ACROSS LAKE MARTIN TO NEAR WETUMPKA ALABAMA...AND OVER BARBOUR COUNTY
...AND OVER GENEVA COUNTIES ALABAMA.

DUE TO THE HIGH TEMPERATURES ALL THESE THUNDERSTORMS HAVE THE
CAPABILITY TO DEVELOP RAPIDLY.  GUSTY SURFACE WINDS...DANGEROUS
|LIGHTNING...HAIL...AND HEAVY DOWNPOURS MAY OCCUR WITH ANY OF THESE
THUNDERSTORMS WITH VERY LITTLE ADVANCE WARNING.

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 20, 2:05 PM CDTSevere Thunderstorm WarningBMXCullman25 min
Aug 20, 2:35 PM CDTSevere Thunderstorm WarningBMXJefferson25 min
Aug 20, 2:54 PM CDTSevere Thunderstorm WarningBMXBlount, Jefferson36 min
Aug 20, 3:25 PM CDTSevere Thunderstorm WarningBMXJefferson35 min
Aug 20, 3:42 PM CDTSevere Thunderstorm WarningBMXWalker33 min
Aug 20, 4:11 PM CDTSevere Thunderstorm WarningBMXShelby34 min
Aug 20, 4:15 PM CDTSevere Thunderstorm WarningBMXFayette30 min
Aug 20, 4:43 PM CDTSevere Thunderstorm WarningBMXFayette32 min
Aug 20, 4:56 PM CDTSevere Thunderstorm WarningBMXBibb34 min
Aug 20, 5:28 PM CDTSevere Thunderstorm WarningBMXPerry32 min
Aug 20, 6:30 PM CDTSevere Thunderstorm WarningBMXGreene, Hale45 min

Nearby

Severe Thunderstorm Warnings in Alabama, 1990Every severe thunderstorm 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.