Alert archive / Alabama / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 270, NWS Birmingham, AL

April 30, 1998Montgomery County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Apr 30, 1998, 4:05 PM CDT for Montgomery County, Alabama. It was in force for 45 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 30, 1998, 4:05 PM CDT (21:05 UTC)
Expired
Apr 30, 1998, 4:50 PM CDT
In force
45 min
Issued by
NWS Birmingham, AL
Area
Whole counties

County Montgomery County, AL

The radar

The Maxwell AFB radar (KMXX), 53 km from the middle of the area, began a volume at 21:04 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 9.1 hours before the alert went out and 119 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 12:00Z on 1998-04-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 158 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 12:00Z on 1998-04-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 163 square meters per square second.19395878Sfc1 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
158 J/kg
Mixed-layer CIN
-11 J/kg
Mixed-layer LCL
515 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
163 m²/s²
0-3 km storm-relative helicity
196 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.9

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KBHM 302105 RRA
SVRBHM
ALC101-302150-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
405 PM CDT THU APR 30 1998

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN MONTGOMERY COUNTY... IN CENTRAL ALABAMA

* UNTIL 450 PM CDT

* AT 402 PM CDT... A SEVERE THUNDERSTORM WAS SHOWN...BY WEATHER RADAR
IN NORTHEASTERN LOWNDES COUNTY.  THIS STORM WAS MOVING NORTHEAST
AROUND 20 MPH.

* THE SEVERE THUNDERSTORM WILL MOVE INTO THE NORTHERN AND WESTERN
AREAS OF MONTGOMERY BETWEEN 415 AND 430 PM.

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

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 30, 3:53 PM CDTSevere Thunderstorm WarningBMXLowndes47 min
Apr 30, 4:19 PM CDTSevere Thunderstorm WarningBMXEtowah46 min
Apr 30, 4:43 PM CDTSevere Thunderstorm WarningBMXPike47 min
Apr 30, 5:16 PM CDTSevere Thunderstorm WarningBMXMontgomery34 min
Apr 30, 5:44 PM CDTSevere Thunderstorm WarningBMXBullock31 min

Nearby

Severe Thunderstorm Warnings in Alabama, 1998Every severe thunderstorm warning in 1998

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; radar from the NEXRAD Level II archive.