Alert archive / Alabama / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 120, NWS Mobile, AL
NWS Mobile, AL issued this severe thunderstorm warning at May 18, 1999, 5:58 PM CDT for Covington County, Alabama. It was in force for 47 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
- May 18, 1999, 5:58 PM CDT (22:58 UTC)
- Expired
- May 18, 1999, 6:45 PM CDT
- In force
- 47 min
- Issued by
- NWS Mobile, AL
- Area
- Whole counties
County Covington County, AL
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 18, 6:30 PM CDT | Thunderstorm Wind 50 | Opp, AL | Trees and power lines were blown down near Opp. |
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
Eglin AFB/Valpar, FL (KVPS), launched 12:00Z, 11.0 hours before the alert went out and 86 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1387 m above ground
- 0-6 km bulk shear
- 3 kt
- 0-1 km storm-relative helicity
- -18 m²/s²
- 0-3 km storm-relative helicity
- 22 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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.
NWS Mobile, AL wrote its last area forecast discussion before this severe thunderstorm warning went out at May 18, 2:16 PM CDT, 3 hours 42 minutes earlier.
Area forecast discussion, May 18, 2:16 PM CDT, 3 hours 42 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MOBILE AL 213PM CDT TUE MAY 18 1999 BOTTOM END OF THE UPPER TROUGH COMING ACROSS THE AREA TODAY. MODELS DID A FAIRLY DECENT JOB IN DEPICTING THIS. MEAN MOISTURE INCREASES AS TROUGH APPROACHES BUT BETTER DYNAMICS ARE OVER CENTRAL AND NORTHERN ALABAMA...WHERE SPC HAS OUTLOOKED SLIGHT CHANCE THAT JUST TAPS NORTHEAST COUNTY WARNING AREA. LIGHTNING AND RADAR DATA SHOW TSTMS DEVELOPING CENTRAL ALABAMA AROUND NOON. EXPECT THESE TO DEVELOP SLOWLY TO THE SOUTH AS TROUGH MOVES EAST...WILL LIKELY NEED HIGHER POPS FOR EVENING HOURS OVER SOUTHEAST ZONES AND LESSER OR NO POPS TO THE WEST. NO POPS AFTER TONIGHT. SURFACE COLD FRONT WILL MOVE OVER FORECAST AREA TONIGHT...DRIER AIR ALOFT FOLLOWS THE UPPER TROUGH AND NEXT FEW DAYS LOOK TO BE DRY AGAIN. FAN MAXES LOOK A BIT COOL FOR TOMORROW BUT MINS SEEM FINE WITH GOOD RADIATION AFTER CLOUDS MOVE OUT...WARMER TO THE EAST WHERE CLOUDS LINGER INTO THE LATE NIGHT. OVER THE COASTAL WATERS...WEAK SURFACE FRONT TO MOVE ACROSS THE COASTAL WATERS TONIGHT. WINDS SHIFTING TO SOUTHWEST THEN WEST AND NORTHWEST WITH TIME. SEAS STILL 2 FEET OR SO. MOB 62/85/61/86 2000 PNS 64/84/62/85 3100 DTS 66/82/66/82 3100 GZH 59/85/57/86 3100 11
The office that day
Everything else NWS Mobile, AL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 18, 5:46 PM CDT | Severe Thunderstorm Warning | MOB | Butler, Crenshaw | 74 min |
| May 18, 6:12 PM CDT | Severe Thunderstorm Warning | MOB | Conecuh | 78 min |
Nearby
Severe Thunderstorm Warnings in Alabama, 1999Every severe thunderstorm warning in 1999
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.