Alert archive / Alabama / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 44, NWS Birmingham, AL

May 1, 1990DeKalb County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at May 1, 1990, 2:58 PM CDT for DeKalb County, Alabama. It was in force for 47 min.

The area

The counties it named.

The facts

Issued
May 1, 1990, 2:58 PM CDT (19:58 UTC)
Expired
May 1, 1990, 3:45 PM CDT
In force
47 min
Issued by
NWS Birmingham, AL
Area
Whole counties

County DeKalb County, AL

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 8.0 hours before the alert went out and 199 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 1990-05-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 728 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, Nashville Metro, TN at 12:00Z on 1990-05-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 142 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
728 J/kg
Mixed-layer CIN
-85 J/kg
Mixed-layer LCL
618 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
142 m²/s²
0-3 km storm-relative helicity
186 m²/s²
Significant tornado parameter
0.0
Supercell composite
5.9

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KBHM 012001
SVRHSV
ALC049-012045-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM
NATIONAL WEATHER SERVICE HUNTSVILLE AL
ISSUED BY BIRMINGHAM AL
258 PM CDT TUE MAY 1 1990
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A
SEVERE THUNDERSTORM EFFECTIVE UNTIL  345 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN NORTH ALABAMA
 
   ...DEKALB COUNTY
 
A VERY STRONG THUNDERSTORM WHICH EARLIER PRODUCED WIND GUSTS TO 60
MILES AN HOUR AS IT MOVED ACROSS SOUTHERN MADISON COUNTY CONTINUES TO
MOVE EASTWARD AROUND 30 MILES AN HOUR.
 
THIS THUNDERSTORM COMPLEX WILL MOVE ACROSS DEKALB COUNTY AND WILL
LIKELY AFFECT THE COMMUNITIES OF SYLVANIA...RAINSVILLE...FORT
PAYNE...VALLEY HEAD...AND HAMMONDVILLE TO NAME JUST A FEW.
 
WHEN THUNDERSTORMS ARE OCCURRING...PEOPLE SHOULD MOVE INSIDE A
STRONG BUILDING.  DO NOT STAND BY WINDOWS.  DON'T USE TELEPHONES
OR ELECTRICAL APPLIANCES UNLESS IN AN EMERGENCY UNTIL THE STORM
HAS PASSED.  MOTORISTS SHOULD NOT DRIVEM INTO LOW WATER CROSSINGS.

The office that day

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

IssuedProductOfficeCountiesLasted
May 1, 2:00 PM CDTSevere Thunderstorm WarningBMXLimestone60 min
May 1, 2:15 PM CDTTornado WarningBMXMadison40 min
May 1, 2:25 PM CDTTornado WarningBMXLawrence30 min
May 1, 2:38 PM CDTSevere Thunderstorm WarningBMXJackson, Marshall52 min
May 1, 4:27 PM CDTSevere Thunderstorm WarningBMXLamar48 min
May 1, 4:31 PM CDTSevere Thunderstorm WarningBMXMarion, Winston59 min
May 1, 4:31 PM CDTSevere Thunderstorm WarningBMXCullman59 min
May 1, 6:40 PM CDTSevere Thunderstorm WarningBMXJefferson65 min
May 1, 6:58 PM CDTSevere Thunderstorm WarningBMXFayette, Tuscaloosa47 min

Nearby

Severe Thunderstorm Warnings in Alabama, 1990Every severe thunderstorm warning in 1990

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.