Alert archive / Alabama / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 200, NWS Birmingham, AL

March 29, 1997St. Clair County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Mar 29, 1997, 2:00 AM CST for St. Clair County, Alabama. It was in force for 20 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Mar 29, 1997, 2:00 AM CST (08:00 UTC)
Expired
Mar 29, 1997, 2:20 AM CST
In force
20 min
Issued by
NWS Birmingham, AL
Area
Whole counties

County St. Clair County, AL

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 8.0 hours before the alert went out and 74 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, Birmingham, AL at 00:00Z on 1997-03-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1329 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, Birmingham, AL at 00:00Z on 1997-03-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 141 square meters per square second.1939587897117Sfc1 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
1329 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
1429 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
141 m²/s²
0-3 km storm-relative helicity
275 m²/s²
Significant tornado parameter
0.8
Supercell composite
8.0

Open this sounding in Storm Lab

The text

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

890 
WUUS1 KBHM 290800 RRA
SVRBHM
ALC115-290820-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
200 AM CST SAT MAR 29 1997

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM AL HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 220 AM CST
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN CENTRAL ALABAMA

   ...ST. CLAIR
 
AT 158 AM CST...A SEVERE THUNDERSTORM WAS INDICATED BY WEATHER
RADAR 5 MILES EAST OF RAGLAND MOVING EAST AT 45 MPH.

THIS STORM IS EXPECTED TO AFFECT EXTREME NORTHEASTERN ST. CLAIR
COUNTY...AND THE NEELY HENRY LAKE AREA.
 
THIS THUNDERSTORM IS CAPABLE OF PRODUCING EXTREMELY LARGE HAIL
WHICH MAY CAUSE SEVERE DAMAGE TO PROPERTY AND SERIOUS INJURY TO
PEOPLE AND LIVESTOCK. DAMAGING WINDS AND TORRENTIAL RAIN ARE ALSO
LIKELY WITH THIS STORM. MOVE TO A STURDY BUILDING AND STAY AWAY
FROM WINDOWS.

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 28, 8:56 PM CSTSevere Thunderstorm WarningBMXLauderdale64 min
Mar 28, 10:32 PM CSTSevere Thunderstorm WarningBMXLawrence58 min
Mar 28, 10:47 PM CSTSevere Thunderstorm WarningBMXMorgan58 min
Mar 29, 12:13 AM CSTSevere Thunderstorm WarningBMXCullman32 min
Mar 29, 12:20 AM CSTSevere Thunderstorm WarningBMXWalker50 min
Mar 29, 12:25 AM CSTSevere Thunderstorm WarningBMXBlount65 min
Mar 29, 12:39 AM CSTSevere Thunderstorm WarningBMXDeKalb66 min
Mar 29, 1:04 AM CSTSevere Thunderstorm WarningBMXSt. Clair31 min
Mar 29, 1:10 AM CSTSevere Thunderstorm WarningBMXEtowah65 min
Mar 29, 1:23 AM CSTSevere Thunderstorm WarningBMXCalhoun62 min
Mar 29, 1:30 AM CSTSevere Thunderstorm WarningBMXCherokee35 min
Mar 29, 2:45 AM CSTSevere Thunderstorm WarningBMXCalhoun30 min
Mar 29, 2:51 AM CSTSevere Thunderstorm WarningBMXCleburne64 min
Mar 29, 5:11 PM CSTSevere Thunderstorm WarningBMXRussell49 min

Nearby

Severe Thunderstorm Warnings in Alabama, 1997Every severe thunderstorm warning in 1997

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.