Alert archive / Virginia / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 151, NWS Blacksburg, VA

November 2, 1999Giles County, Virginia

NWS Blacksburg, VA issued this severe thunderstorm warning at Nov 2, 1999, 1:29 PM EST for Giles County, Virginia. It was in force for 36 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: Nov 2, 1999, 1:29 PM EST (18:29 UTC)
Expired: Nov 2, 1999, 2:05 PM EST
In force: 36 min
Issued by: NWS Blacksburg, VA
Area: Whole counties

County Giles County, VA

What was reported inside it

Time	Report	Where	Remark
Nov 2, 1:45 PM EST	Thunderstorm Wind	Pearisburg, VA

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

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 6.5 hours before the alert went out and 155 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 8 J/kg
Mixed-layer CIN: -47 J/kg
Mixed-layer LCL: 540 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 209 m²/s²
0-3 km storm-relative helicity: 274 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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 2, 10:15 AM EST, 3 hours 14 minutes earlier.

Area forecast discussion, Nov 2, 10:15 AM EST, 3 hours 14 minutes before

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In the hours before

Special weather statement, Nov 2, 11:50 AM EST, 1 hour 39 minutes before

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Special weather statement, Nov 2, 11:50 AM EST, 1 hour 39 minutes before

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Local storm report, Nov 2, 1:29 PM EST, 0 minutes before

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Local storm report, Nov 2, 1:29 PM EST, 0 minutes before

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The office that day

Everything else NWS Blacksburg, VA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Nov 2, 12:00 PM EST	Severe Thunderstorm Warning	RNK	Grayson	65 min
Nov 2, 12:46 PM EST	Severe Thunderstorm Warning	RNK	Wythe	34 min
Nov 2, 12:51 PM EST	Severe Thunderstorm Warning	RNK	Pulaski	34 min
Nov 2, 1:27 PM EST	Severe Thunderstorm Warning	RNK	Montgomery, City of Radford	33 min
Nov 2, 8:09 AM EST	Flash Flood Warning	RNK	Watauga	4 hr

Nearby

Severe Thunderstorm Warnings in Virginia, 1999 Every 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.