Alert archive / Louisiana / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 349, NWS Shreveport, LA
NWS Shreveport, LA issued this severe thunderstorm warning at Aug 12, 1998, 3:41 PM CDT for Natchitoches Parish, Louisiana. It was in force for 49 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
- Aug 12, 1998, 3:41 PM CDT (20:41 UTC)
- Expired
- Aug 12, 1998, 4:30 PM CDT
- In force
- 49 min
- Issued by
- NWS Shreveport, LA
- Area
- Whole counties
County Natchitoches Parish, LA
The radar
The Ft Polk radar (KPOE), 64 km from the middle of the area, began a volume at 20:58 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 |
|---|---|---|---|
| Aug 12, 3:55 PM CDT | Thunderstorm Wind 52 | Natchitoches, 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
Shreveport, LA (KSHV), launched 12:00Z, 8.7 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
- 1388 J/kg
- Mixed-layer CIN
- -130 J/kg
- Mixed-layer LCL
- 1225 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- 52 m²/s²
- 0-3 km storm-relative helicity
- 108 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 Aug 12, 2:45 PM CDT, 56 minutes earlier.
Area forecast discussion, Aug 12, 2:45 PM CDT, 56 minutes before
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</html>In the hours before
Special weather statement, Aug 12, 10:00 AM CDT, 5 hours 41 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>167-121600- THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE SHREVEPORT LA 1000 AM CDT WED AUG 12 1998 SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS ARE EXPECTED TO OCCUR ACROSS THE REGION THIS AFTERNOON WITH SCATTERED THUNDERSTORMS CONTINUING WELL INTO THE NIGHT. ALTHOUGH A FEW STORMS COULD BRIEFLY REACH SEVERE LIMITS WITH LARGE HAIL AND DAMAGING WIND GUSTS...THE MAIN THREAT FROM THESE STORMS WILL BE EXTREMELY HEAVY RAINFALL. AN AREA OF STRONG THUNDERSTORMS WITH 2 TO 4 INCHES OF RAINFALL WAS MOVING INTO NORTHEAST LOUISIANA LATE THIS MORNING AND ADDITIONAL THUNDERSTORM CLUSTERS MAY DEVELOP LATER. DUE TO THE STILL RELATIVELY ISOLATED NATURE OF SEVERE WEATHER EVENTS... ACTIVATION OF STORM SPOTTERS...HAM RADIO OPERATORS...AND EMERGENCY MANAGEMENT PERSONNEL IS NOT ANTICIPATED THIS AFTERNOON OR EVENING. VII
Special weather statement, Aug 12, 10:00 AM CDT, 5 hours 41 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>167-121600- THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE SHREVEPORT LA 1000 AM CDT WED AUG 12 1998 SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS ARE EXPECTED TO OCCUR ACROSS THE REGION THIS AFTERNOON WITH SCATTERED THUNDERSTORMS CONTINUING WELL INTO THE NIGHT. ALTHOUGH A FEW STORMS COULD BRIEFLY REACH SEVERE LIMITS WITH LARGE HAIL AND DAMAGING WIND GUSTS...THE MAIN THREAT FROM THESE STORMS WILL BE EXTREMELY HEAVY RAINFALL. AN AREA OF STRONG THUNDERSTORMS WITH 2 TO 4 INCHES OF RAINFALL WAS MOVING INTO NORTHEAST LOUISIANA LATE THIS MORNING AND ADDITIONAL THUNDERSTORM CLUSTERS MAY DEVELOP LATER. DUE TO THE STILL RELATIVELY ISOLATED NATURE OF SEVERE WEATHER EVENTS... ACTIVATION OF STORM SPOTTERS...HAM RADIO OPERATORS...AND EMERGENCY MANAGEMENT PERSONNEL IS NOT ANTICIPATED THIS AFTERNOON OR EVENING. VII
The office that day
Everything else NWS Shreveport, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 4:42 PM CDT | Severe Thunderstorm Warning | SHV | Bowie | 33 min |
| Aug 12, 5:14 PM CDT | Severe Thunderstorm Warning | SHV | Bowie | 46 min |
| Aug 12, 5:38 PM CDT | Severe Thunderstorm Warning | SHV | Morris | 47 min |
| Aug 12, 12:44 AM CDT | Severe Thunderstorm Warning | SHV | Bossier | 46 min |
| Aug 12, 12:41 PM CDT | Flash Flood Warning | SHV | Union | 4 hr |
| Aug 12, 1:16 PM CDT | Flash Flood Warning | SHV | Lincoln | 4 hr |
| Aug 11, 9:48 PM CDT | Severe Thunderstorm Warning | SHV | Miller | 32 min |
Nearby
Severe Thunderstorm Warnings in Louisiana, 1998Every severe thunderstorm warning in 1998
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.