Alert archive / Texas / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 39, NWS Shreveport, LA
NWS Shreveport, LA issued this severe thunderstorm warning at Feb 9, 1998, 7:56 PM CST for Upshur County, Texas. It was in force for 64 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 9, 1998, 7:56 PM CST (01:56 UTC)
- Expired
- Feb 9, 1998, 9:00 PM CST
- In force
- 64 min
- Issued by
- NWS Shreveport, LA
- Area
- Whole counties
County Upshur County, TX
The radar
The Shreveport radar (KSHV), 108 km from the middle of the area, began a volume at 02:00 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 |
|---|---|---|---|
| Feb 9, 8:15 PM CST | Hail 0.75 | Gilmer, TX |
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 00:00Z, 1.9 hours before the alert went out and 115 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
- 157 J/kg
- Mixed-layer CIN
- -57 J/kg
- Mixed-layer LCL
- 1112 m above ground
- 0-6 km bulk shear
- 74 kt
- 0-1 km storm-relative helicity
- 190 m²/s²
- 0-3 km storm-relative helicity
- 349 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.0
The text
As transmitted, in the capitals the NWS used until 2016.
089 WUUS1 KSHV 100156 SVRSHV TXC459-100300- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING...CORRECTED FOR SPELLING... NATIONAL WEATHER SERVICE SHREVEPORT LA 756 PM CST MON FEB 9 1998 THE NATIONAL WEATHER SERVICE IN SHREVEPORT LA HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 900 PM CST FOR THE FOLLOWING AREA... IN NORTHEASTERN TEXAS ...UPSHUR COUNTY AT 754 PM CST DOPPLER RADAR IN SHREVEPORT INDICATED A SEVERE THUNDERSTORM NEAR BIG SANDY MOVING TO THE NORTHEAST AT 30 MPH. THIS STORM MAY AFFECT GILMER AND PRITCHETT. THIS STORM WILL PRODUCE HAIL THE SIZE OF DIMES OR LARGER. 4/6
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 Feb 9, 1:30 PM CST, 6 hours 26 minutes earlier.
Area forecast discussion, Feb 9, 1:30 PM CST, 6 hours 26 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SHREVEPORT LA 130 PM CST MON FEB 9 1998 SFC LOW CNTRD OVR TX PNHDL NR KAMA AS OF 19Z WITH TRAILING DIFFUSE COLD FNT INTO FAR W TX BIG BEND COUNTRY. SAT IMAGERY SHOWS FIRST UPR SHORT WAV TROF CNTRD OVR SE CO WITH SECOND UPSTREAM SHORT WAVE TROF MOVG EAST OVR AZ. PER CURRENT RADAR AND SAT TRENDS...THE FIRST SHORT WAV TROF WILL HAVE LITTLE EFFECT ON FA FCST...BUT RATHER SET THE STAGE FOR INCREASING MOISTURE RETURN AND DEVELOPING SFC LOW OVR TX. THE FIRST SHORT WAVE TROF WILL MOV OFF TO THE NE OF FA WHILE THE SECOND TROF WILL MOV SFC LOW THROUGH OK AND AR WITH FA IN WARM SECTOR OF AIRMASS. BELIEVE THAT TSTMS WILL DEVELOP ALONG COLD FRONT DURING TONIGHT AND LAST THROUGHOUT MUCH OF TUE BEFORE MOVG E INTO MS. THE SECOND UPR SHORT WAV TROF AND SFC LOW WILL DEVELOP A GOOD BAROCLINIC STRUCTURE AFTER 24 HRS AS UPR TROF WILL TRAIL SFC LOW BY AT LEAST 150 MILES. THE SERN SECTIONS OF THE CONUS WILL HAVE A DECENT STORM TO DEAL WITH...BUT FOR THE KSHV FA BELIEVE THAT THE FOUL TSTMS WILL REMAIN ON OUR SRN FRINGES WITH HEAVY RAINFALL TO THE ERN SECTIONS WHERE GULF MOISTURE INFLOW WILL BE MORE FAVORABLE WITH A 35 KNT LOW LEVEL JET. BELIEVE THAT TSTMS WILL DEVELOP IN EARNEST DURING LATE TONIGHT AND LAST THROUGHOUT MUCH OF TUE. WILL WORD FCST ACCORDINGLY WITH SCT TO NUMEROUS TSTMS LATE TONIGHT AND TUE WITH ISENTROPIC LIFT...AN APPROACHING COLD FNTL BOUNDARY...AND APPROACHING PVA WITH ASSOCIATED UPR SHORT WAVE TROF TO PROVIDE UPWARD LIFT. MODELS RESULTS ARE ALL SIMILAR TO EACH OTHER WITH TEMP AND SFC WND TRENDS. SEE NO REASON TO DIVERGE. SHV 56/64/41/63 4720 MLU 55/64/45/62 3840 08
The office that day
Everything else NWS Shreveport, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 9, 8:38 PM CST | Tornado Warning | SHV | Gregg | 47 min |
| Feb 9, 8:52 PM CST | Tornado Warning | SHV | Harrison | 33 min |
| Feb 9, 8:57 PM CST | Severe Thunderstorm Warning | SHV | Marion | 48 min |
| Feb 9, 9:03 PM CST | Tornado Warning | SHV | Marion | 47 min |
| Feb 9, 9:49 PM CST | Tornado Warning | SHV | Marion | 31 min |
| Feb 10, 6:32 AM CST | Severe Thunderstorm Warning | SHV | Gregg, Smith | 48 min |
| Feb 10, 8:21 AM CST | Severe Thunderstorm Warning | SHV | Cass | 49 min |
| Feb 10, 12:03 PM CST | Tornado Warning | SHV | Cass | 47 min |
| Feb 10, 12:34 PM CST | Severe Thunderstorm Warning | SHV | Bowie | 46 min |
| Feb 10, 1:28 PM CST | Severe Thunderstorm Warning | SHV | Angelina | 47 min |
| Feb 10, 1:38 PM CST | Severe Thunderstorm Warning | SHV | Nacogdoches | 47 min |
| Feb 10, 1:48 PM CST | Severe Thunderstorm Warning | SHV | San Augustine | 47 min |
| Feb 10, 2:01 PM CST | Severe Thunderstorm Warning | SHV | Sabine | 49 min |
Nearby
Severe Thunderstorm Warnings in Texas, 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.