Alert archive / Louisiana / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 1, NWS Shreveport, LA
NWS Shreveport, LA issued this severe thunderstorm warning at Jan 1, 1999, 2:48 PM CST for Sabine Parish, Louisiana. It was in force for 32 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
- Jan 1, 1999, 2:48 PM CST (20:48 UTC)
- Expired
- Jan 1, 1999, 3:20 PM CST
- In force
- 32 min
- Issued by
- NWS Shreveport, LA
- Area
- Whole counties
County Sabine Parish, LA
The nearest sounding before it
Shreveport, LA (KSHV), launched 12:00Z, 8.8 hours before the alert went out and 104 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
- 561 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 327 m²/s²
- 0-3 km storm-relative helicity
- 434 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 Shreveport, LA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jan 1, 10:00 AM CST, 4 hours 48 minutes earlier.
Area forecast discussion, Jan 1, 10:00 AM CST, 4 hours 48 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SHREVEPORT LA 1000 AM CST FRI JAN 1 1999 STRONG WARM AND MOIST ADVECTION AS EXPECTED THIS MORNING ALREADY PRODUCING TRWS. VAD PROFILE RESULTING IN HIGH HELICITY SO AS STORMS CONTINUE TO DEVELOP THIS AFTERNOON SEVERE WX EXPECTED..ESPECIALLY SOUTH OF I20 WHERE SURFACE TEMPS/DEWPOINTS ARE EXPECTED TO CLIMB INTO THE 60S. FORECAST LOOK OK FOR NOW..BUT WILL CONTINUE TO MONITOR PROGESSION OF WARM FRONT..AS TEMP FORECAST COULD GO BUST IF IT MAKES SIGNIFICANT MOVEMENT TO NORTH. MOST ISENTRPOIC LIFT AT THIS TIME APPEARS TO BE OVER SW AR OVER THE COLDEST AIR..BUT INDICATIONS ARE THIS IS PULLING TO THE NE. 14
In the hours before
Special weather statement, Jan 1, 10:15 AM CST, 4 hours 33 minutes before
ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-TXZ096- 097-108>112-124>126-136>138-149>153-165>167-011800- THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE SHREVEPORT LA 1015 AM CST FRI JAN 1 1999 A WARM FRONT WILL MOVE ACROSS EAST TEXAS AND NORTHWEST LOUISIANA TODAY AS A STRONG COLD FRONT APPROACHES FROM THE WEST. THUNDERSTORMS WILL BECOME MORE NUMEROUS AS THE DAY PROGRESSES AND BY MID AFTERNOON INTO EARLY TONIGHT SEVERE WEATHER INCLUDING LARGE HAIL...DAMAGING THUNDERSTORM WINDS...AND ISOLATED TORNADOES WILL BE POSSIBLE. SOUTHERN PORTIONS OF THE FOUR STATE AREA SOUTH OF I20 HAVE THE HIGHEST RISK OF SEVERE STORMS. ACTIVATION OF STORM SPOTTERS...HAM RADIO OPERATORS AND EMERGENCY MANAGEMENT PERSONNEL MAY BE REQUIRED FOR SEVERE WEATHER LATER THIS AFTERNOON AND TONIGHT. 14
The office that day
Everything else NWS Shreveport, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 1, 3:07 PM CST | Tornado Warning | SHV | Angelina | 48 min |
| Jan 1, 4:20 PM CST | Severe Thunderstorm Warning | SHV | Nacogdoches | 50 min |
| Jan 1, 5:39 PM CST | Severe Thunderstorm Warning | SHV | Nacogdoches | 31 min |
| Jan 1, 4:00 PM CST | Tornado Warning | SHV | Sabine | 30 min |
Nearby
Severe Thunderstorm Warnings in Louisiana, 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.