Alert archive / Alabama / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 100, NWS Mobile, AL
NWS Mobile, AL issued this severe thunderstorm warning at May 4, 1999, 12:48 PM CDT for Mobile County, Alabama. It was in force for 57 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
- May 4, 1999, 12:48 PM CDT (17:48 UTC)
- Expired
- May 4, 1999, 1:45 PM CDT
- In force
- 57 min
- Issued by
- NWS Mobile, AL
- Area
- Whole counties
County Mobile County, AL
The nearest sounding before it
Eglin AFB/Valpar, FL (KVPS), launched 12:00Z, 5.8 hours before the alert went out and 164 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
- 1519 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 232 m²/s²
- 0-3 km storm-relative helicity
- 292 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 4, 3:05 AM CDT, 9 hours 43 minutes earlier.
Area forecast discussion, May 4, 3:05 AM CDT, 9 hours 43 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MOBILE AL 305 AM CDT TUE MAY 4 1999 ALL MODELS IN FAIRLY GOOD AGREEMENT...INDICATING A GOOD CHANCE FOR PCPN OVER MOST OF THE REGION BEGINNING LATE THIS AFTERNOON AND CONTINUING POPS INTO WED NIGHT. AVN/ETA SOLUTIONS LOOK TO HAVE INITIALIZED...NGM DIFFERS WITH UPPER FEATURES OVER FA THIS PERIOD. SHORTWAVE OVER ERN TX THIS MORNING TO EJECT E ALONG GULF COAST AS UPPER LOW OVER PLAINS STATES LIFTS NE. FAIRLY STRONG 850MB JET PROGGED TO DEVELOP OVER REGION TONIGHT AND WED...ALLOWING ABUNDANT AND DEEP LAYER OF GULF MOISTURE TO FLOW INTO REGION. DEWPOINTS ALREADY IN THE UPPER 50S/LOW 60S ALONG COASTAL FA...AND EXPECT THESE VALUES TO ADVECT INLAND TODAY. AFOREMENTIONED SHORTWAVE WILL PROVIDE ENUF UVVS THIS AFTERNOON AND EVENING TO SUPPORT WIDELY SCATTERED TO SCATTERED SHRA/TSRA ACTIVITY OVER REGION. MID AND LOW LEVEL LIFT INCREASING LATE TONIGHT AND WED IN ADVANCE OF SFC FEATURE WHICH WILL BE JUST W OF MS RIVER BY PERIODS END. AS A RESULT...SHRA/TSTMS SHOULD BECOME MORE NUMEROUS OVER FA TUE NIGHT AND WED. WITH STRONGEST DYNAMICS N OF FA...WILL NOT GO QUITE AS HIGH AS AVN POPS...BUT CHANCE/GOOD CHANCE POPS LOOK TO BE IN ORDER FOR TONIGHT AND WED. WILL HAVE TO MONITOR FOR POSSIBLE SEVERE THREAT OVER WESTERN CWA TONIGHT AND WED. COASTAL WATERS...SE-S WINDS AS WELL AS SEAS TO GRADUALLY BUILD THIS PERIOD PRES GRADIENT TIGHTENS IN ADVANCE OF APPROACHING SYSTEM. WIDELY SCATTERED SHRA/TSTMS THIS AFTERNOON MORE LIKELY TONIGHT AND WED. MOB 83/69/82/67 3453 PNS 79/70/79/70 2453 DTS 79/70/79/71 2353 GZH 84/64/83/65 2454 12
The office that day
Everything else NWS Mobile, AL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 4, 11:57 AM CDT | Severe Thunderstorm Warning | MOB | Choctaw | 48 min |
| May 4, 1:30 PM CDT | Severe Thunderstorm Warning | MOB | Baldwin | 75 min |
| May 4, 3:14 PM CDT | Severe Thunderstorm Warning | MOB | Baldwin | 76 min |
| May 4, 4:04 PM CDT | Severe Thunderstorm Warning | MOB | Clarke | 71 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; the sounding from the Mesonet's radiosonde archive.