Alert archive / Alabama / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 111, NWS Mobile, AL
NWS Mobile, AL issued this severe thunderstorm warning at Apr 21, 1997, 6:15 PM CDT for Mobile County, Alabama. It was in force for 45 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Apr 21, 1997, 6:15 PM CDT (23:15 UTC)
- Expired
- Apr 21, 1997, 7:00 PM CDT
- In force
- 45 min
- Issued by
- NWS Mobile, AL
- Area
- Whole counties
County Mobile County, AL
The radar
The Mobile radar (KMOB), 4 km from the middle of the area, began a volume at 23:18 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 21, 6:17 PM CDT | Hail 1.75 | Mt Vernon, AL | Quarter to golfball size hail again fell in and east of Mt Vernon. This was from the same slow moving thunderstorm that had dumped hail on much of the city only minutes earlier. |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 12:00Z, 11.3 hours before the alert went out and 152 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
- 795 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 550 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 102 m²/s²
- 0-3 km storm-relative helicity
- 101 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.5
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KMOB 212314 RRA SVRMOB ALC097-220000- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MOBILE AL 615 PM CDT MON APR 21 1997 THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 700 PM CDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN SOUTHWEST ALABAMA ...MOBILE COUNTY AT 614 PM CDT...MOBILE DOPPLER WEATHER RADAR SHOWED A A SEVERE THUNDERSTORM PRODUCING GOLF BALL TO EGG SIZE HAIL AT MT VERNON. THIS STORM WILL BE PASSING OVER THE RIVER DELTA THROUGH 7 PM. THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH YOU SHOULD PREPARE FOR DAMAGING WIND IN EXCESS OF 55 MPH...LARGE HAIL...AND DEADLY LIGHTNING. PEOPLE OUzTSIDE SHOULD MOVE TO A SHELTER... PREFERABLY INSIDE A STRONG BUILDING BUT STAY AWAY FROM WINDOWS. &
The office that day
Everything else NWS Mobile, AL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 21, 4:01 PM CDT | Severe Thunderstorm Warning | MOB | Clarke, Washington | 44 min |
| Apr 21, 4:11 PM CDT | Severe Thunderstorm Warning | MOB | Mobile | 49 min |
| Apr 21, 4:25 PM CDT | Severe Thunderstorm Warning | MOB | Baldwin, Monroe | 65 min |
| Apr 21, 4:47 PM CDT | Severe Thunderstorm Warning | MOB | Washington | 58 min |
| Apr 21, 5:08 PM CDT | Severe Thunderstorm Warning | MOB | Mobile | 67 min |
| Apr 21, 5:08 PM CDT | Severe Thunderstorm Warning | MOB | Clarke | 67 min |
| Apr 21, 5:25 PM CDT | Severe Thunderstorm Warning | MOB | Baldwin | 65 min |
| Apr 21, 5:35 PM CDT | Severe Thunderstorm Warning | MOB | Conecuh, Monroe | 55 min |
| Apr 21, 5:42 PM CDT | Severe Thunderstorm Warning | MOB | Wilcox | 63 min |
| Apr 21, 6:28 PM CDT | Severe Thunderstorm Warning | MOB | Baldwin | 62 min |
| Apr 21, 6:33 PM CDT | Severe Thunderstorm Warning | MOB | Conecuh | 57 min |
Nearby
Severe Thunderstorm Warnings in Alabama, 1997Every severe thunderstorm warning in 1997
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.