Alert archive / Alabama / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 267, NWS Birmingham, AL
NWS Birmingham, AL issued this severe thunderstorm warning at Apr 18, 1998, 7:58 PM CDT for Calhoun 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
- Apr 18, 1998, 7:58 PM CDT (00:58 UTC)
- Expired
- Apr 18, 1998, 8:45 PM CDT
- In force
- 47 min
- Issued by
- NWS Birmingham, AL
- Area
- Whole counties
County Calhoun County, AL
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 18, 5:45 PM CDT | Tornado Watch | SPC | 5 hr |
The nearest sounding before it
Birmingham, AL (KBMX), launched 00:00Z, 1.0 hours before the alert went out and 110 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.
- Mixed-layer CAPE
- 782 J/kg
- Mixed-layer CIN
- -35 J/kg
- Mixed-layer LCL
- 612 m above ground
- 0-6 km bulk shear
- 83 kt
- 0-1 km storm-relative helicity
- 229 m²/s²
- 0-3 km storm-relative helicity
- 393 m²/s²
- Significant tornado parameter
- 1.7
- Supercell composite
- 13.5
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KBHM 190058 RRA SVRBHM ALC015-190145- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE BIRMINGHAM AL 758 PM CDT SAT APR 18 1998 THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... CALHOUN COUNTY... IN EAST CENTRAL ALABAMA * UNTIL 845 PM CDT * AT 756 PM CDT... A LINE OF SEVERE THUNDERSTORMS WAS SHOWN...BY WEATHER RADAR MOVING OUT OF ST. CLAIR AND TALLEDEGA COUNTIES INTO CALHOUN. THE STROMS WERE MOVING NORTHEAST AROUND 40 MILES AN HOUR. * THE SEVERE THUNDERSTORMS WILL AFFECT MOST COMMUNITIES IN CALHOUN COUNTY THROUGH 845 PM... GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS! A TORNADO WATCH IS IN EFFECT. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING.
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, Apr 18, 7:20 PM CDT, 38 minutes before
ALZ023-032-039-190125- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BIRMINGHAM AL 720 PM CDT SAT APR 18 1998 THE TORNADO WATCH NUMBER 246 HAS BEEN CANCELLED FOR THE FOLLOWING COUNTIES... IN ALABAMA ...TUSCALOOSA... HALE... MARENGO
The office that day
Everything else NWS Birmingham, AL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 18, 7:01 PM CDT | Tornado Warning | BMX | Marshall | 19 min |
| Apr 18, 7:02 PM CDT | Tornado Warning | BMX | Jefferson | 33 min |
| Apr 18, 7:13 PM CDT | Severe Thunderstorm Warning | BMX | Chilton | 62 min |
| Apr 18, 7:26 PM CDT | Flash Flood Warning | BMX | DeKalb | 4 hr |
| Apr 18, 7:26 PM CDT | Severe Thunderstorm Warning | BMX | St. Clair, Talladega | 64 min |
| Apr 18, 7:30 PM CDT | Tornado Warning | BMX | Lowndes | 50 min |
| Apr 18, 7:36 PM CDT | Tornado Warning | BMX | DeKalb | 44 min |
| Apr 18, 7:39 PM CDT | Tornado Warning | BMX | Chilton | 31 min |
| Apr 18, 7:44 PM CDT | Tornado Warning | BMX | Cherokee | 46 min |
| Apr 18, 7:55 PM CDT | Tornado Warning | BMX | Shelby | 20 min |
| Apr 18, 8:23 PM CDT | Tornado Warning | BMX | Talladega | 62 min |
| Apr 18, 9:06 PM CDT | Severe Thunderstorm Warning | BMX | Cherokee | 19 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.