Alert archive / Alabama / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 41, NWS Mobile, AL

April 29, 1991Baldwin County, Mobile County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Apr 29, 1991, 1:28 PM CDT for Baldwin County, Mobile County, Alabama. It was in force for 62 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 29, 1991, 1:28 PM CDT (18:28 UTC)
Expired
Apr 29, 1991, 2:30 PM CDT
In force
62 min
Issued by
NWS Mobile, AL
Area
Whole counties

Counties Baldwin County, AL, Mobile County, AL

What was reported inside it

TimeReportWhereRemark
Apr 29, 2:20 PM CDTThunderstorm Wind 0Mobile, 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, 6.5 hours before the alert went out and 172 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 1991-04-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2664 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 1991-04-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 193 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
2664 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
578 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
193 m²/s²
0-3 km storm-relative helicity
211 m²/s²
Significant tornado parameter
2.6
Supercell composite
12.9

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMOB 291828
SVRMOB
ALC003-097-291930-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
128 PM CDT MON APR 29 1991
 
THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  230 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN SOUTHWEST ALABAMA
 
   ...NORTHERN BALDWIN COUNTY...MOBILE COUNTY
 
AT 125 PM THE MOBILE RADAR SHOWED A LINE OF INTENSIFYING THUNDERSTORMS
FROM JUST WEST OF MT VERNON TO JUST NORTHWEST OF THE MOBILE AIRPORT
SOUTHWEST INTO MISSISSIPPI. THE LINE WAS MOVING TOWARD THE EAST AT 30
MPH.
 
DAMAGING WINDS ARE LIKELY WITH THIS THUNDERSTORM LINE.
 
A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA.  REMEMBER
SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES
WITH LITTLE OR NO ADVANCE WARNING.  REMAIN CALM BUT BE ALERT TO
RAPIDLY CHANGING WEATHER CONDITIONS.

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 29, 7:30 AM CDT, 5 hours 58 minutes before
MSZ014-013-291430-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
730 AM CDT MON APR 29 1991

...TORNADO WATCH NUMBER 235 IS IN EFFECT FOR THE FOLLOWING COUNTIES OF
SOUTHEAST MISSISSIPPI... PEARL-RIVER... AND PERRY UNTIL 9 AM CDT...

MOBILE AT 725 AM CDT SHOWED ONLY ISOLATED SHOWERS OVER SOUTHEAST
MISSISSIPPI WITH THE STORM SYSTEM STILL NORTH AND NORTHWEST OF THE
SOUTHEAST COUNTIES OF MISSISSIPPI.

WEATHER PROBLEMS FOR THE PEARL-RIVER AND PERRY COUNTIES FOR THE NEXT
COUPLE HOURS WILL ONLY BE IN THE FORM OF GUSTY WINDS RANGING FROM THE
LOW TO UPPER 20S FROM THE SOUTH.  THE AIRMASS OVER THE AREA REMAINS
UNSTABLE WITH STRONG THUNDERSTORMS MOVING INTO THE AREA LATER THIS
MORNING.
Special weather statement, Apr 29, 10:10 AM CDT, 3 hours 18 minutes before
ALZ013-015-016-MSZ014-013-291615-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
1010 AM CDT MON APR 29 1991

...A TORNADO WATCH REMAINS IN EFFECT FOR ALL OF SOUTHEAST MISSISSIPPI
AND SOUTHWEST ALABAMA UNTIL 100 PM...

ALL COUNTIES IN SOUTHEAST MISSISSIPPI AND IN SOUTHWEST ALABAMA ARE
UNDER A TORNADO WATCH UNTIL EARLY AFTERNOON.

WEATHER SERVICE RADARS INDICATED AT 1000 AM AN AREA OF THUNDERSTORMS
WITH THE LEADING EDGE ALONG A THOMASVILLE TO MILLRY ALABAMA LINE
SOUTHWEST TO NEAR RICHTON AND POPLARVILLE MISSISSIPPI.  THE AREA WAS
MOVING TOWARD THE EAST AT 10 MPH WHILE THE INDIVIDUAL THUNDERSTORMS
WERE MOVING NORTHEAST AT 40 MPH.  STRONG THUNDERSTORMS WERE INDICATED
JUST WEST OF LAKE PONCHARTRAIN IN LOUISIANA.

THE ATMOSPHERE REMAINS MOIST AND UNSTABLE THIS MORNING AND WILL BECOME
MORE SO BY AFTERNOON.  RESIDENTS IN SOUTHEAST MISSISSIPPI AND
SOUTHWEST ALABAMA SHOULD REMAIN ALERT FOR THE POSSIBILITY OF SEVERE
WEATHAER TODAY AND BE READY TO TAKE QUICK ACTION IF SEVERE WEATHER IS
OBSERVED OR A WARNING IS ISSUED.
Local storm report, Apr 29, 11:47 AM CDT, 1 hour 41 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE MOBILE AL
1147 AM CDT MON APR 29 1991

TIME             EVENT
1135 AM          CLARKE COUNTY EMA DIRECTOR REPORTED A TORNADO CROSSED
                 US HIGHWAY 84 6 MILES WEST OF GROVE HILL.

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 29, 11:13 AM CDTTornado WarningMOBClarke32 min
Apr 29, 11:13 AM CDTTornado WarningMOBLowndes62 min
Apr 29, 11:29 AM CDTSevere Thunderstorm WarningMOBAutauga46 min
Apr 29, 11:51 AM CDTTornado WarningMOBMontgomery54 min
Apr 29, 12:49 PM CDTSevere Thunderstorm WarningMOBCrenshaw56 min
Apr 29, 1:04 PM CDTSevere Thunderstorm WarningMOBButler56 min
Apr 29, 1:28 PM CDTSevere Thunderstorm WarningMOBMacon62 min
Apr 29, 2:35 PM CDTSevere Thunderstorm WarningMOBBaldwin, Mobile55 min
Apr 29, 3:19 PM CDTTornado WarningMOBBaldwin11 min

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.