Alert archive / Alabama / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 48, NWS Tallahassee, FL
NWS Tallahassee, FL issued this severe thunderstorm warning at May 13, 1999, 7:26 PM CDT for Henry County, Alabama. It was in force for 34 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 13, 1999, 7:26 PM CDT (00:26 UTC)
- Expired
- May 13, 1999, 8:00 PM CDT
- In force
- 34 min
- Issued by
- NWS Tallahassee, FL
- Area
- Whole counties
County Henry County, AL
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 13, 4:15 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 0.4 hours before the alert went out and 153 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
- 702 J/kg
- Mixed-layer CIN
- -22 J/kg
- Mixed-layer LCL
- 1354 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 127 m²/s²
- 0-3 km storm-relative helicity
- 106 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 3.5
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 Tallahassee, FL wrote its last area forecast discussion before this severe thunderstorm warning went out at May 13, 1:00 PM CDT, 6 hours 26 minutes earlier.
Area forecast discussion, May 13, 1:00 PM CDT, 6 hours 26 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TALLAHASSEE FL 200 PM EDT THU MAY 13 1999 IN THE SHORT TERM...SCATTERED CONVECTION IS EXPECTED THROUGH THE AFTERNOON AND INTO THIS EVENING. STORM CLUSTER OVER GULF (SOUTH OF PANAMA CITY) HAS WEAKENED & WILL MOVE E-SE & GENERALLY STAY OFF SHORE. WITH GRADIENT LEVEL FLOW MORE WESTERLY & STRONGER TODAY...SEA BREEZE WILL RUN AHEAD OF SHORTWAVE ENERGY FROM NORTHERN SYSTEM...& NOT BE MUCH OF A FACTOR. BUT SHORTWAVE ENERGY WILL SWING THROUGH CWA TOWARD EVENING & OVERNIGHT & SHOULD HELP GENERATE CONVECTION. AS AFTERNOON PROGRESSES...ADDITIONAL DESTABALIZATION WILL OCCUR...WITH MAIN THREAT OVER CWA OF SOME PULSE STORMS. PRECIPITABLE WATER VALUES ARE GENERALLY ABOVE 1.20 INCHES...& SOME LOCALIZED HEAVY RAIN IS EXPECTED. OVERALL SEVERE POTENTIAL SHOULD STAY LOW. MODELS ARE GENERALLY CONSISTENT WITH MOVING SHORTWAVE EAST OF CWA BY FRI NOON...AS PREFRONTAL TROUGH DRIFTS THROUGH TONIGHT...THEN WEAK COLD FRONT FRI AM. SHOULD BE SOME SCATTERED CONVECTION...BUT MOST OF DYNAMICS STAY NORTH. AS WINDS SHIFT TO W-NW...DRYING TREND SEEN FRIDAY AFTERNOON & INTO WEEKEND. ETAS DEPICTION OF PRECIP FIELDS ARE HIT & MISS PER SCATTERED AFFECT. FOR TEMPS...COOLER FAN LOOKS BETTER. TLH 61 84 58 84 532- PFN 65 81 62 82 432- DHN 65 84 60 83 543- ABY 62 83 60 82 5432 VLD 62 85 61 84 5432 MCT
The office that day
Everything else NWS Tallahassee, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 13, 10:05 PM CDT | Severe Thunderstorm Warning | TAE | Decatur, Miller, Seminole | 35 min |
| May 13, 8:22 PM CDT | Severe Thunderstorm Warning | TAE | Coffee, Geneva | 33 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.