Alert archive / Alabama / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 91, NWS Mobile, AL
NWS Mobile, AL issued this severe thunderstorm warning at Apr 8, 1998, 9:07 AM CDT for Mobile County, Alabama. It was in force for 63 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 8, 1998, 9:07 AM CDT (14:07 UTC)
- Expired
- Apr 8, 1998, 10:10 AM CDT
- In force
- 63 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 14:02 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 8, 9:30 AM CDT | Hail 0.75 | Chastang, AL | Dime size hail was reported just northeast of Chastang. |
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, 2.1 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
- 1980 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 502 m above ground
- 0-6 km bulk shear
- 67 kt
- 0-1 km storm-relative helicity
- 152 m²/s²
- 0-3 km storm-relative helicity
- 173 m²/s²
- Significant tornado parameter
- 2.2
- Supercell composite
- 7.2
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KMOB 081404 RRA SVRMOB ALC097-081510- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MOBILE AL 907 AM CDT WED APR 8 1998 THE NATIONAL WEATHER SERVICE IN MOBILE AL HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1010 AM CDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN SOUTHWESTERN ALABAMA ...NORTHERN MOBILE COUNTY AT 906 AM CDT... DOPPLER RADAR AT MOBILE INDICATED A SEVERE THUNDERSTORM 9 MILES SOUTH OFj CITRONELLE MOVING NORTHEAST AT 30 MPH. SOME LOCATIONS AFFECTED BY THIS STORM ARE... CITRONELLE AT 920 AM CDT MOUNT VERNON AT 935 AM CDT PRIMARY THREAT WILL BE LARGE HAIL.
The office that day
Everything else NWS Mobile, AL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 8, 9:20 AM CDT | Severe Thunderstorm Warning | MOB | Baldwin | 35 min |
| Apr 8, 9:56 AM CDT | Severe Thunderstorm Warning | MOB | Baldwin | 34 min |
| Apr 8, 10:05 AM CDT | Severe Thunderstorm Warning | MOB | Covington | 35 min |
| Apr 8, 10:19 AM CDT | Tornado Warning | MOB | Covington | 36 min |
| Apr 8, 10:59 AM CDT | Severe Thunderstorm Warning | MOB | Conecuh | 31 min |
| Apr 8, 11:10 AM CDT | Severe Thunderstorm Warning | MOB | Covington | 30 min |
| Apr 8, 11:38 AM CDT | Tornado Warning | MOB | Covington | 32 min |
| Apr 8, 12:42 PM CDT | Severe Thunderstorm Warning | MOB | Washington | 33 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.