Alert archive / Louisiana / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 128, NWS Lake Charles, LA
NWS Lake Charles, LA issued this severe thunderstorm warning at Sep 7, 1999, 4:42 PM CDT for Acadia Parish, Louisiana. It was in force for 53 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Sep 7, 1999, 4:42 PM CDT (21:42 UTC)
- Expired
- Sep 7, 1999, 5:35 PM CDT
- In force
- 53 min
- Issued by
- NWS Lake Charles, LA
- Area
- Whole counties
County Acadia Parish, LA
The radar
The Lake Charles radar (KLCH), 79 km from the middle of the area, began a volume at 21:42 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 7, 5:10 PM CDT | Hail 0.75 | Maxie, LA |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
The nearest sounding before it
Lake Charles Mun, LA (KLCH), launched 12:00Z, 9.7 hours before the alert went out and 78 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
- 1440 J/kg
- Mixed-layer CIN
- -40 J/kg
- Mixed-layer LCL
- 915 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- -20 m²/s²
- 0-3 km storm-relative helicity
- -3 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 Lake Charles, LA wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 7, 3:26 PM CDT, 1 hour 16 minutes earlier.
Area forecast discussion, Sep 7, 3:26 PM CDT, 1 hour 16 minutes before
SOUTHEAST TEXAS...SOUTHWEST/CENTRAL LOUISIANA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LAKE CHARLES LA 215 PM CDT TUE SEP 7 1999 LATEST SFC ANALYSIS SHOWS WEAK SFC BOUNDARY ACROSS STRETCHING ACROSS THE MID-SOUTH INTO NE AR / SW MO ALONG WITH A STRONGER COLD FRONT ACROSS THE NORTHERN AND WESTERN HIGH PLAINS. CLOSER TO HOME... SHWRS/TSTMS LINING UP FROM NEAR SHV TO SOUTH-CENTRAL LA ALONG A SFC MOISTURE CONV BOUNDARY. SHORT TERM...BASED ON CURRENT TRENDS AND THE RUC WHICH IS HANDLING THE AXIS OF MOISTURE CONV BEST...WILL USE REMAINDER OF THIS AFTERNOON WORDING FOR EASTERN HALF OF FA. TNGT/WED...MODELS SIMILAR WITH PLACEMENT OF FEATURES BOTH SFC AND ALOFT. SFC FRONT MOVES INTO TX PANHANDLE / SOUTHERN OK BY 00Z THU. NGM/ETA BOTH DEPICT A S/WV TO ENTER NORTHERN LA WED AFT WITH AVN PLACEMENT OF S/WV FURTHER EAST AND WEAKER. MEAN RHS INCREASE SLIGHTLY AND SOME THETA RIDGING NOSES INTO NORTH/WEST FA WED AFT. FOR TNGT...WILL USE 20 POPS FOR AEX/LFT AND 10 LCH/BPT FOR RESIDUAL EVE ACTIVITY. WILL STAY CLOSE TO PERSISTENCE/PRIOR PKG FOR TEMPS. FOR WED...WILL GO ABOVE MOS GUIDANCE A BIT AND USE 30 FOR LCH/BPT AND 40 FOR AEX/LFT. WILL STAY CLOSE TO PRIOR PKG FOR 2ND PERIOD TEMPS. WED NIGHT/THU...BELIEVE NGM IS QUICK MOVING FRONT INTO AND THRU FA...FILTERING IN SLIGHTLY COOLER/DRIER AIR WED NIGHT ACROSS NORTH/WEST FA. WILL GO WITH SFC FRONT ENTERING NW LA EARLY THU AM AND INTO FA THU AFT. WILL STAY CLOSE TO PERSISTENCE FOR TEMPS WED NIGHT. FOR POPS...WILL USE 10/20 WITH EVE WORDING FOR SOUTH AND 20 IN NORTH. FOR THU...WILL USE 40 POPS IN THE SOUTH AND 30 IN NORTH WITH BECMG PCLDY WORDING FOR THE AFT. WITH THE FRONT FAIRLY STRONG... COULD SEE SOME STRONG TSTMS THU AFT. TEMPS WILL RUN CLOSE TO PERSISTENCE IN THE SOUTH AND SLIGHTLY COOLER IN THE NORTH. EXTENDED...COOL AIR MOVES INTO ENTIRE FA BY FRI AM. LOOKS LIKE A GREAT WEEKEND FOR OUTDOOR LAND-BASED ACTIVITIES. AM CONCERNED THAT MODERATE NORTHERLY FLOW MAY GENERATE SCEC OR EVEN SCA CRITERIA OVER THE COASTAL WATERS EARLY THIS WEEKEND. TEMPS WILL BEGIN A SLOW RISE BACK TO CLIMO EARLY NEXT WEEK. 18 .LCH... TX...NONE LA...NONE PRELIM NUMBERS: LCH 74/93/73/93 1314 LFT 74/94/73/93 2424 AEX 72/94/71 /92 2423 BPT 74/93/73/93 1314
The office that day
Everything else NWS Lake Charles, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 7, 4:09 PM CDT | Tornado Warning | LCH | Saint Landry | 46 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.