Alert archive / Virginia / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 263, NWS Blacksburg, VA
NWS Blacksburg, VA issued this severe thunderstorm warning at Nov 25, 1998, 11:31 PM EST for Grayson County, Virginia; Ashe County, North Carolina. It was in force for 29 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Nov 25, 1998, 11:31 PM EST (04:31 UTC)
- Expired
- Nov 26, 1998, 12:00 AM EST
- In force
- 29 min
- Issued by
- NWS Blacksburg, VA
- Area
- Whole counties
Counties Ashe County, NC, Grayson County, VA
The radar
The Roanoke radar (KFCX), 111 km from the middle of the area, began a volume at 04:34 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.
The nearest sounding before it
Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 4.5 hours before the alert went out and 141 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1463 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 307 m²/s²
- 0-3 km storm-relative helicity
- 377 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 Blacksburg, VA wrote its last area forecast discussion before this severe thunderstorm warning went out at Nov 25, 8:45 PM EST, 2 hours 46 minutes earlier.
Area forecast discussion, Nov 25, 8:45 PM EST, 2 hours 46 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BLACKSBURG VA 845 PM EST WED NOV 25 1998 THANKS FOR COORD EVERYONE... NATIONAL RADAR SHOWING LARGE RAIN AREA WITH EMBEDDED CONVECTION ASSOCIATED WITH STRONG MINOR WAVE ENTERING KENTUCKY AT TIME. EVENING SOUNDING SHOWING STRONG VEERING AND WARM AIR ADVECTION...BUT HAS STORNG MID LEVEL CAP. QUESTION IS WILL THERE BE ENOUGH ENERGY AVAILABLE TO DO WORK ON LIFTING CAP. POSSBILITY EXISTS WITH SUCH A STRONG WAVE...SO WILL ADD MENTION OF THUNDER TO WORK ZONES. VAD WIND PROFILE SHOWING 50KT WIND LOWER TO AROUND 7000 FEET AND WILL ONLY LOWER...SO WILL ALSO UP WIND FORECAST FOR WESTERN MOUNTAINS. TEMPS LOOK ON TRACK AND WORK ZONES WILL FOLLOW SHORTLY. HH
The office that day
Everything else NWS Blacksburg, VA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 25, 11:46 PM EST | Severe Thunderstorm Warning | RNK | Carroll, Grayson, Patrick | 34 min |
| Nov 26, 12:25 AM EST | Severe Thunderstorm Warning | RNK | Patrick | 35 min |
| Nov 25, 11:31 PM EST | Severe Thunderstorm Warning | RNK | Watauga | 29 min |
| Nov 25, 11:46 PM EST | Severe Thunderstorm Warning | RNK | Alleghany | 34 min |
| Nov 26, 12:34 AM EST | Severe Thunderstorm Warning | RNK | Stokes | 31 min |
Nearby
Severe Thunderstorm Warnings in Virginia, 1998Severe Thunderstorm Warnings in North Carolina, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.