Alert archive / Arkansas / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 314, NWS Shreveport, LA
NWS Shreveport, LA issued this severe thunderstorm warning at Aug 20, 1997, 6:41 PM CDT for Lafayette County, Arkansas. 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 20, 1997, 6:41 PM CDT (23:41 UTC)
- Expired
- Aug 20, 1997, 7:30 PM CDT
- In force
- 49 min
- Issued by
- NWS Shreveport, LA
- Area
- Whole counties
County Lafayette County, AR
The radar
The Shreveport radar (KSHV), 91 km from the middle of the area, began a volume at 23:41 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 20, 6:50 PM CDT | Thunderstorm Wind 60 | Lewisville, AR | Winds were estimated by local observer. Trees and powerlines were toppled by the winds. |
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, 11.7 hours before the alert went out and 86 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
- 2093 J/kg
- Mixed-layer CIN
- -72 J/kg
- Mixed-layer LCL
- 1005 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 71 m²/s²
- 0-3 km storm-relative helicity
- 112 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 20, 3:30 PM CDT, 3 hours 11 minutes earlier.
Area forecast discussion, Aug 20, 3:30 PM CDT, 3 hours 11 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SHREVEPORT LA 330 PM CDT WED AUG 20 1997 CDFNT MOVG INTO SE OK WILL PUSH INTO EXTREME NORTH LA AFT MIDNIGHT. SHORT WAVE SEEN ON SATL TRAVELING IN NW FLOW FIRING OFF VERY STG POST FNTL CONVECTION NORTH OK ATTM. WILL KEEP LOW POPS IN FOR AREA AS LITTLE OR NO CU DVLP THIS AFTN...BUT WILL LEAVE LOW POPS IN FOR LATE DUE TO PRESENT MVMNT OF VORT. VRY DRY MID LVL AIR AND STG NVA IN WAKE OF FNT AND VORT WILL RAISE TEMPS INTO MID 90S DUE TO DRY AIR WRMG. BOTH NGM AND ETA DIVE UNSEASONABLE STG UPR LVL SYSTEM INTO SOUTH OK BY FRI MRNG. NGM CENTERS PVA/UPR DIV AND LIFT IN SE RATHER THAN SC OK. ALIGNMENT OF THESE PARAMETER WITH EACH OTHER ALSO QUITE IMPRESSIVE. MSTR LOOKING ADEQUATE BY FRI WITH MID LVL MSTR ONLY LAGGING SLIGHTLY BEHIND LOW LVL. EXACT TRACK OF SYSTEM WILL DEPEND ON POSN OF OLD FNTL BNDRY...BUT USING A COMPRO BTWN MODELS SHOWS GOOD CHC TSTMS FOR SE OK AND AT LEAST A CHUNK OF NE TX. DECREASE POPS TO ISOLD EXTREME SE CWA AND CHC ELSEWHERE. SHV 75/95/70/90 2013 MLU 73/94/68/90 1002 VII
The office that day
Everything else NWS Shreveport, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 6:28 PM CDT | Severe Thunderstorm Warning | SHV | Hempstead, Miller | 32 min |
Nearby
Severe Thunderstorm Warnings in Arkansas, 1997Every severe thunderstorm warning in 1997
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.