Alert archive / Alabama / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 21, NWS Birmingham, AL

January 18, 1999DeKalb County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Jan 18, 1999, 1:38 AM CST for DeKalb County, Alabama. It was in force for 47 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
Jan 18, 1999, 1:38 AM CST (07:38 UTC)
Expired
Jan 18, 1999, 2:25 AM CST
In force
47 min
Issued by
NWS Birmingham, AL
Area
Whole counties

County DeKalb County, AL

The watch it was issued in

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

IssuedProductOfficeLasted
Jan 18, 1:15 AM CSTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 7.6 hours before the alert went out and 168 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 1999-01-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 802 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 1999-01-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 150 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
802 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
796 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
150 m²/s²
0-3 km storm-relative helicity
244 m²/s²
Significant tornado parameter
0.7
Supercell composite
4.1

Open this sounding in Storm Lab

The text

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

999 
WUUS1 KBHM 180739 RRA
SVRBHM
ALC049-180825-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
138 AM CST MON JAN 18 1999

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  DEKALB COUNTY... IN NORTHERN ALABAMA

* UNTIL 225 AM CST

* AT 136 AM CST... A SEVERE THUNDERSTORM PRODUCING LARGE HAIL WAS
  SHOWN...BY NATIONAL WEATHER SERVICE DOPPLER RADAR...NEAR THE TOWN OF
RAINSVILLE.  MOVEMENT WAS TO THE NORTHEAST AT 40 MILES PER HOUR.  IT
WILL AFFECT THE TOWNS OF SYLVANIA AND HAMMONDVILLE.  DIME TO NICKLE
SIZED HAIL WAS REPORTED IN RAINSVILLE AS THIS STORM MOVED THROUGH.


DAMAGING WINDS AND LARGE HAIL ARE LIKELY. GO INSIDE A STURDY BUILDING
AND STAY AWAY FROM WINDOWS

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 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 DONT
DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

&

The office that day

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

IssuedProductOfficeCountiesLasted
Jan 17, 7:57 PM CSTSevere Thunderstorm WarningBMXLauderdale63 min
Jan 17, 8:57 PM CSTSevere Thunderstorm WarningBMXLauderdale63 min
Jan 17, 11:12 PM CSTSevere Thunderstorm WarningBMXFranklin48 min
Jan 17, 11:16 PM CSTSevere Thunderstorm WarningBMXLawrence64 min
Jan 17, 11:27 PM CSTSevere Thunderstorm WarningBMXLamar48 min
Jan 17, 11:29 PM CSTSevere Thunderstorm WarningBMXLimestone46 min
Jan 17, 11:47 PM CSTSevere Thunderstorm WarningBMXMarion48 min
Jan 17, 11:58 PM CSTSevere Thunderstorm WarningBMXMadison32 min
Jan 18, 12:07 AM CSTSevere Thunderstorm WarningBMXJackson48 min
Jan 18, 12:45 AM CSTSevere Thunderstorm WarningBMXCullman50 min
Jan 18, 12:56 AM CSTSevere Thunderstorm WarningBMXMarshall, Morgan49 min
Jan 18, 1:12 AM CSTSevere Thunderstorm WarningBMXWinston33 min
Jan 18, 1:33 AM CSTSevere Thunderstorm WarningBMXPickens32 min
Jan 18, 1:40 AM CSTSevere Thunderstorm WarningBMXCullman50 min
Jan 18, 1:44 AM CSTSevere Thunderstorm WarningBMXWalker46 min
Jan 18, 1:50 AM CSTSevere Thunderstorm WarningBMXTuscaloosa45 min
Jan 18, 2:00 AM CSTSevere Thunderstorm WarningBMXBlount45 min
Jan 18, 2:18 AM CSTSevere Thunderstorm WarningBMXJefferson47 min
Jan 18, 2:29 AM CSTSevere Thunderstorm WarningBMXEtowah46 min
Jan 18, 2:34 AM CSTSevere Thunderstorm WarningBMXTuscaloosa21 min
Jan 18, 2:38 AM CSTSevere Thunderstorm WarningBMXMarshall47 min
Jan 18, 3:26 AM CSTSevere Thunderstorm WarningBMXCherokee49 min

Nearby

Severe Thunderstorm Warnings in Alabama, 1999Every severe thunderstorm warning in 1999

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.