Alert archive / Alabama / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 13, NWS Mobile, AL

April 8, 1991Mobile County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Apr 8, 1991, 10:40 AM CDT for Mobile County, Alabama. 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
Apr 8, 1991, 10:40 AM CDT (15:40 UTC)
Expired
Apr 8, 1991, 11:40 AM CDT
In force
60 min
Issued by
NWS Mobile, AL
Area
Whole counties

County Mobile County, AL

What was reported inside it

TimeReportWhereRemark
Apr 8, 10:50 AM CDTHail 0.75Mobile, AL

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

Slidell Radar S, LA (KSIL), launched 12:00Z, 3.7 hours before the alert went out and 152 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, Slidell Radar S, LA at 12:00Z on 1991-04-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 870 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, Slidell Radar S, LA at 12:00Z on 1991-04-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 173 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
870 J/kg
Mixed-layer CIN
-49 J/kg
Mixed-layer LCL
678 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
173 m²/s²
0-3 km storm-relative helicity
286 m²/s²
Significant tornado parameter
0.8
Supercell composite
6.8

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMOB 081541
SVRMOB
ALC097-081640-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
1040 AM CDT MON APR 8 1991

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1140 AM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...

IN SOUTHWEST ALABAMA

   ...MOBILE COUNTY

AT 1038 AM THE MOBILE RADAR INDICATED A SEVERE THUNDERSTORM JUST WEST
OF THE MOBILE AIRPORT MOVING TOWARD THE NORTHEAST AT 25 MPH.

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, Apr 8, 8:17 AM CDT, 2 hours 23 minutes before
ALZ013-015-016-MSZ014-013-081515-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
817 AM CDT MON APR 8 1991

...THUNDERSTORMS MOVING ACROSS THE MISSISSIPPI AND ALABAMA COAST FOR
THE REMAINDER OF THIS MORNING...

THUNDERSTORMS DEVELOPING OVER THE MISSISSIPPI COASTAL COUNTIES THIS
MORNING ARE EXPECTED TO MOVE NORTHEAST ACROSS PORTIONS OF SOUTHEAST
MISSISSIPPI AND SOUTHWEST ALABAMA.

THESE THUNDERSTORMS WILL PRODUCE DANGEROUS LIGHTNING...GUSTY WINDS...
BRIEF HEAVY RAINFALL AND POSSIBLY SOME HAIL.

COMMUTERS GOING TO WORK OR SCHOOL SHOULD PLAN EXTRA TIME TO ACCOUNT
FOR REDUCED VISIBILITY AND WET ROADS.
Special weather statement, Apr 8, 10:31 AM CDT, 9 minutes before
ALZ013-015-016-MSZ014-013-081700-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
1030 AM CDT MON APR 8 1991

...THUNDERSTORMS CONTINUING OVER JACKSON COUNTY MISSISSIPPI AND MOBILE
AND BALDWIN COUNTIES OF ALABAMA...

THE MOBILE RADAR AT 1025 AM INDICATED STRONG THUNDERSTORMS OVER EXTREME
SOUTHEAST MISSISSIPPI AND THE TWO SOUTHWESTERN COUNTIES OF ALABAMA.  THE
THUNDERSTORMS WERE MOVING TOWARD THE NORTHEAST AT 25 MPH.

THESE THUNDERSTORMS ARE PRODUCING DANGEROUS LIGHTNING...GUSTY WINDS OF
35 TO 45 MPH...HEAVY RAINFALL AND POSSIBLY SOME HAIL.  A STRONG
DOWNBURST WIND AT THE MOBILE AIRPORT RAISED THE TEMPERATURE 10 DEGREES
IN 2 MINUTES BEFORE IF FELL BACK TO 67 DEGREES.  RESIDENTS MAY NOTICE
SOME RAPID TEMPERATURE FLUCTUATIONS.

IF THE THUNDERSTORMS SHOW ADDITIONAL INCREASING INTENSITY...WARNINGS
MAY BE ISSUED.  YOU ARE ADVISED TO REMAIN ALERT.

Nearby

Severe Thunderstorm Warnings in Alabama, 1991Every severe thunderstorm warning in 1991

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.