Alert archive / Mississippi / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 12, NWS Mobile, AL

April 8, 1991Stone County, Mississippi

NWS Mobile, AL issued this severe thunderstorm warning at Apr 8, 1991, 8:55 AM CDT for Stone County, Mississippi. It was in force for 35 min.

The area

The counties it named.

The facts

Issued
Apr 8, 1991, 8:55 AM CDT (13:55 UTC)
Expired
Apr 8, 1991, 9:30 AM CDT
In force
35 min
Issued by
NWS Mobile, AL
Area
Whole counties

County Stone County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 1.9 hours before the alert went out and 82 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

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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, 38 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.

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 8, 10:40 AM CDTSevere Thunderstorm WarningMOBMobile60 min

Nearby

Severe Thunderstorm Warnings in Mississippi, 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; the sounding from the Mesonet's radiosonde archive.