Alert archive / Alabama / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 103, NWS Mobile, AL
NWS Mobile, AL issued this severe thunderstorm warning at May 4, 1999, 4:04 PM CDT for Clarke County, Alabama. It was in force for 71 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, 4:04 PM CDT (21:04 UTC)
- Expired
- May 4, 1999, 5:15 PM CDT
- In force
- 71 min
- Issued by
- NWS Mobile, AL
- Area
- Whole counties
County Clarke County, AL
The nearest sounding before it
Eglin AFB/Valpar, FL (KVPS), launched 12:00Z, 9.1 hours before the alert went out and 184 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
As transmitted, in the capitals the NWS used until 2016.
999 WUUS1 KMOB 042107 RRA SVRMOB ALC025-042215- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MOBILE AL 404 PM CDT TUE MAY 4 1999 THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... CLARKE COUNTY IN SOUTHWESTERN ALABAMA * UNTIL 515 PM CDT * AT 403 PM CDT... AS INDICATED BY DOPPLER RADAR A SEVERE THUNDERSTORM WAS LOCATED 10 MILES WEST OF THOMASVILLE OR 3 MILES SOUTH OF TALLAHATTA SPRINGS... MOVING NORTHEAST AT 30 MPH. * THE SEVERE THUNDERSTORM WILL REACH THE VICINITY OF - TALLAHATTA SPRINGS BY 405 PM CDT THOMASVILLE BY 420 PM CDT ROUNDHILL BY 425 PM CDT WHEN THUNDERSTORMS ARE OCCURRING...PEOPLE SHOULD MOVE INSIDE A STRONG BUILDING. DO NOT STAND BY WINDOWS. DO NOT USE TELEPHONES OR ELECTRICAL APPLIANCES UNLESS IN AN EMERGENCY UNTIL THE STORM HAS PASSED. MOTORISTS SHOULD NOT DRIVE INTO LOW WATER CROSSINGS.
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, 2:28 PM CDT, 1 hour 36 minutes earlier.
Area forecast discussion, May 4, 2:28 PM CDT, 1 hour 36 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MOBILE AL 228 pM CDT TUE MAY 4 1999 MODELS INITIALIZED WELL AT 18Z WITH 986MB SFC LOW ACROSS CENTRAL KS AND UPPER LEVEL TROF STACKED BACK OVER CO. AVN SEEMS TO HAVE BEST HANDLE ON WEAK SHORT WAVE ENERGY CURRENTLY TRACKING ACROSS MS-LA-AL AND PUSHING EWD THIS AFTN. THIS ENERGY COUPLED WITH AFTN HTG... STRONG SFC MOISTURE CONVERGENCE AND BROAD AREA OF DIFFLUENT FLOW ALOFT ARE PRODUCING SCATTERED STRONG-SVR TSTMS OVER PORTIONS OF FA THIS AFTN. EXPECT SHORT WAVE ENERGY TO PUSH EAST OF AREA LATER TONIGHT WITH A BREAK IN THE ACTIVITY LIKELY BEGINNING BY 9-10 PM TNGT THRU WED MRNG. BY EARLY WED AFTN...MODELS SHOW INCREASING CAPES (2000-3000+ CAPES) AND THTA-E RIDGING ACROSS FA AS SFC FRONT MOVES INTO WEST LA WITH APPROACHING UPPER LEVEL SHORT WAVE. THIS SHOULD RESULT IN DEVELOPING SCATTERED CONVECTION ACROSS MUCH OF FA BY WED AFTN...THEN INCREASING IN COVERAGE WED NGT AS FRONT PUSHES INTO MS-SE LA LATE WED NIGHT THRU EARLY THU MRNG WITH STRONG MOISTURE CONVERGENCE AND INCREASING INSTABILITIES POOLED JUST OUT AHEAD. AS FRONT PUSHES INTO FA THU MRNG...EXPECT DECREASING POPS BY THU AFTN AS BEST UPPER SUPPORT LIFTS WELL NE AND INSTABILITIES GET PUSHED EWD OUT AHEAD OF FRONT. ALTHO ISOLATED SVR TSTMS WILL REMAIN POSSIBLE WED AFTN-THU MRNG...NOT EXPECTING ANY WIDESPREAD THREAT HERE WITH MAIN UPPER LEVEL PUNCH REMAINING WELL NORTH OF FA...BUT WILL MONITOR FOR THE ISOLATED THREAT. BEST QPF ACCUMULATIONS ARE EXPECTED FROM LATE WED AFTN THRU EARLY THU MRNG WITH WIDESPREAD 1/4 TO 1/2 INCH LIKELY WITH SOME ISOLATED 1-3 INCHES POSSIBLE. FA REMAINS EXTREMELY DRY SO FLASH FLOOD THREAT SHOULD REMAIN MINIMAL AT THIS TIME. GUIDANCE TEMPS LOOK CLOSE...SO WILL NOT STRAY FAR THRU PERIOD. LONG RANGE...FRONT WILL LIKELY STALL OVER COASTAL WATERS THU NIGHT INTO FRI...THEN PUSH BACK NORTH AS WF OVER THE WEEKEND AS NEXT SYSTEM TRACKS ACROSS NORTH CENTRAL U.S. AND SFC RIDGE BUILDS BACK IN FROM FL. MOB 68/82/68/80 4653 PNS 70/79/70/78 4653 DTS 70/79/70/78 4653 GZH 64/83/65/81 4653 39
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, 12:48 PM CDT | Severe Thunderstorm Warning | MOB | Mobile | 57 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 |
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.