Alert archive / Texas / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 2, NWS Shreveport, LA
NWS Shreveport, LA issued this severe thunderstorm warning at Jan 1, 1999, 4:20 PM CST for Nacogdoches County, Texas. It was in force for 50 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, 4:20 PM CST (22:20 UTC)
- Expired
- Jan 1, 1999, 5:10 PM CST
- In force
- 50 min
- Issued by
- NWS Shreveport, LA
- Area
- Whole counties
County Nacogdoches County, TX
The nearest sounding before it
Shreveport, LA (KSHV), launched 12:00Z, 10.3 hours before the alert went out and 126 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, 3:15 PM CST, 1 hour 5 minutes earlier.
Area forecast discussion, Jan 1, 3:15 PM CST, 1 hour 5 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SHREVEPORT LA 315 PM CST FRI JAN 1 1999 STRONG WARM AND MOIST ADVECTION CONTINUES INTO THE AFTERNOON HOURS ACROSS CWA AND IS EXPECTED TO INCREASE PER PROGS BY 00Z. SEVERE WX HAS ALREADY BEGUN ACROSS E CENTRAL TEXAS AND WILL SPREAD EAST INTO LA PARISHES THIS EVENING. WARM FRONT APPEARS TO BE MOVING NORTH THIS AFTERNOON..SO SEVERE STORMS MAY BE POSSIBLE AS FAR NORTH AS TXK. TIMING OF COLD FRONT AMONG VARIOUS MODELS IS BETTER THAN PREVIOUS RUNS AND WILL ENTER NW PORTION OF CWA AROUND MIDNIGHT..REACHING SE PARISHES BY 9 AM SAT. SOME POST FRONTAL RAIN EXPECTED TIL AROUND MIDDAY BUT THINK TEMPERATURES SHOULD REMAIN ABOVE FREEZING MARK UNTIL SUNSET. THUS NO FROZEN PRECIPITATION EXPECTED. BEYOND MIDDAY SAT..DRY WEATHER EXPECTED THROUGH MIDDLE OF NEXT WEEK. TEMPS LOOK A LITTLE WARM ON NGM MOS AS TIMING STILL A COUPLE HOURS BEHIND AVN. LIKE AVN NUMBERS FOR SATURDAY BUT PERFER MIX OF TWO FOR SAT NIGHT THROUGH SUNDAY. SHV 45/48/23/39 +710 MLU 56/60/27/39 +910 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, 5:39 PM CST | Severe Thunderstorm Warning | SHV | Nacogdoches | 31 min |
| Jan 1, 2:48 PM CST | Severe Thunderstorm Warning | SHV | Sabine | 32 min |
| Jan 1, 4:00 PM CST | Tornado Warning | SHV | Sabine | 30 min |
Nearby
Severe Thunderstorm Warnings in Texas, 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.