Alert archive / Alabama / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 219, NWS Birmingham, AL

April 21, 1997Lauderdale County, Limestone County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Apr 21, 1997, 6:08 PM CDT for Lauderdale County, Limestone County, Alabama. It was in force for 67 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
Apr 21, 1997, 6:08 PM CDT (23:08 UTC)
Expired
Apr 21, 1997, 7:15 PM CDT
In force
67 min
Issued by
NWS Birmingham, AL
Area
Whole counties

Counties Lauderdale County, AL, Limestone County, AL

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 21, 1:30 PM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 11.1 hours before the alert went out and 156 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, Nashville Metro, TN at 12:00Z on 1997-04-21Temperature 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, Nashville Metro, TN at 12:00Z on 1997-04-21The 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1346 m above ground
0-6 km bulk shear
67 kt
0-1 km storm-relative helicity
141 m²/s²
0-3 km storm-relative helicity
278 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 KHSV 212307
SVRHSV
ALC077-083-220015-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE HUNTSVILLE AL
608 PM CDT MON APR 21 1997
 
THE NATIONAL WEATHER SERVICE IN HUNTSVILLE HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  715 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONSS...
 
IN NORTH ALABAMA
 
   ...LAUDERDALE COUNTY...LIMESTONE COUNTY
 
AT 603 PM CDT...HAM SPOTTERS REPORTED NICKEL SIZED HAIL NEAR CLOVERDALE
IN EXTREME NORTHERN LAUDERDALE COUNTY. RADAR ALSO INDICATED AN INTEN-
SIFYING THUNDERSTORM OVER NORTHERN LIMESTONE NEAR ELKMONT...ALSO MOVING
TO THE EAST RAPIDLY.
 
 
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.
 
 
 
&

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 21, 2:49 PM CDTSevere Thunderstorm WarningBMXLauderdale56 min
Apr 21, 3:41 PM CDTSevere Thunderstorm WarningBMXLimestone64 min
Apr 21, 4:03 PM CDTSevere Thunderstorm WarningBMXColbert, Lawrence57 min
Apr 21, 6:35 PM CDTSevere Thunderstorm WarningBMXMadison55 min
Apr 21, 6:43 PM CDTSevere Thunderstorm WarningBMXMarion62 min
Apr 21, 6:53 PM CDTSevere Thunderstorm WarningBMXLawrence, Morgan67 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.