Alert archive / Arkansas / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 64, NWS Shreveport, LA
NWS Shreveport, LA issued this severe thunderstorm warning at Feb 11, 1999, 12:02 PM CST for Hempstead County, Arkansas. It was in force for 33 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
- Feb 11, 1999, 12:02 PM CST (18:02 UTC)
- Expired
- Feb 11, 1999, 12:35 PM CST
- In force
- 33 min
- Issued by
- NWS Shreveport, LA
- Area
- Whole counties
County Hempstead County, AR
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Feb 11, 12:10 PM CST | Thunderstorm Wind 62 | Hope, AR | Trees down along I-30. |
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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Feb 11, 12:00 PM CST | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Springfield, MO (KSGF), launched 12:00Z, 6.0 hours before the alert went out and 352 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
- 261 J/kg
- Mixed-layer CIN
- -163 J/kg
- Mixed-layer LCL
- 871 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 275 m²/s²
- 0-3 km storm-relative helicity
- 308 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.4
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
The office that day
Everything else NWS Shreveport, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 11, 11:49 AM CST | Severe Thunderstorm Warning | SHV | Bowie, Cass | 26 min |
| Feb 11, 11:12 AM CST | Severe Thunderstorm Warning | SHV | Howard | 48 min |
| Feb 11, 11:54 AM CST | Severe Thunderstorm Warning | SHV | Miller | 46 min |
| Feb 11, 12:28 PM CST | Severe Thunderstorm Warning | SHV | Nevada | 47 min |
| Feb 11, 12:39 PM CST | Severe Thunderstorm Warning | SHV | Lafayette | 31 min |
| Feb 11, 1:10 PM CST | Severe Thunderstorm Warning | SHV | Columbia | 50 min |
| Feb 11, 1:37 PM CST | Severe Thunderstorm Warning | SHV | Union | 53 min |
Nearby
Severe Thunderstorm Warnings in Arkansas, 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.