Alert archive / Alabama / Severe Thunderstorm Warnings in 1992

Severe Thunderstorm Warning 98, NWS Birmingham, AL

June 18, 1992Calhoun County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Jun 18, 1992, 7:40 PM CDT for Calhoun County, Alabama. It was in force for 65 min.

The area

The counties it named.

The facts

Issued
Jun 18, 1992, 7:40 PM CDT (00:40 UTC)
Expired
Jun 18, 1992, 8:45 PM CDT
In force
65 min
Issued by
NWS Birmingham, AL
Area
Whole counties

County Calhoun County, AL

The nearest sounding before it

Centreville/Bibb, AL (KCKL), launched 00:00Z, 0.7 hours before the alert went out and 160 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, Centreville/Bibb, AL at 00:00Z on 1992-06-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1038 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, Centreville/Bibb, AL at 00:00Z on 1992-06-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 37 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
1038 J/kg
Mixed-layer CIN
-18 J/kg
Mixed-layer LCL
1468 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
37 m²/s²
0-3 km storm-relative helicity
94 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.3

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, Jun 18, 1:46 PM CDT, 5 hours 54 minutes before
ALZ004>006-008-182000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
145 PM CDT THU JUN 18 1992

...SEVERE THUNDERSTORM WATCH IN EFFECT FOR MUCH OF NORTH ALABAMA
UNTIL 7PM CDT...

AT 140 PM CDT...NATIONAL WEATHER SERVICE RADAR SHOWED A LINE OF SHOWERS
AND THUNDERSTORMS ACROSS NORTHWEST ALABAMA.  THIS LINE OF SHOWERS AND
THUNDERSTORMS WILL INTENSIFY AS IT MOVES TO THE EAST-SOUTHEAST AT
ABOUT 30 MPH.  THESE STORMS WILL MOVE INTO THE WEST CENTRAL ALABAMA
COUNTIES OF MARION...WINSTON AND CULLMAN BY 3 PM CDT.  THE STRONGER
STORMS WILL BE CAPABLE OF PRODUCING STRONG GUSTY WINDS...HEAVY RAIN....
DEADLY LIGHTNING...AND POSSIBLY HAIL.

ELSEWHERE...AN ISOLATED THUNDERSTORM HAD DE_VELOPED OVER PICKENS COUNTY
NEAR ALICEVILLE.

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 18, 7:40 PM CDTSevere Thunderstorm WarningBMXClay, Cleburne, Talladega65 min
Jun 18, 7:40 PM CDTSevere Thunderstorm WarningBMXShelby65 min

Nearby

Severe Thunderstorm Warnings in Alabama, 1992Every severe thunderstorm warning in 1992

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.