Alert archive / Virginia / Tornado Warnings in 2004

Tornado Warning 4, NWS Blacksburg, VA

September 17, 2004Patrick County, Virginia; Stokes County, North Carolina

NWS Blacksburg, VA issued this tornado warning at Sep 17, 2004, 10:28 AM EDT for Patrick County, Virginia; Stokes County, North Carolina. It was in force for 32 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Sep 17, 2004, 10:28 AM EDT (14:28 UTC)
Expired
Sep 17, 2004, 11:00 AM EDT
In force
32 min
Issued by
NWS Blacksburg, VA
Area
Counties, with a storm outline in the text

Counties Stokes County, NC, Patrick County, VA

The radar

The Roanoke radar (KFCX), 53 km from the middle of the area, began a volume at 14:27 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Sep 17, 10:10 AM EDTTornado WatchSPC7 hr

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 2.5 hours before the alert went out and 62 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-pSkew-T log-p diagram, Greensboro/Hi Pt, NC at 12:00Z on 2004-09-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 888 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Greensboro/Hi Pt, NC at 12:00Z on 2004-09-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 237 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
888 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
551 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
237 m²/s²
0-3 km storm-relative helicity
297 m²/s²
Significant tornado parameter
1.0
Supercell composite
5.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WFUS51 KRNK 171428
TORRNK
NCC169-VAC141-171500-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE BLACKSBURG VA
1026 AM EDT FRI SEP 17 2004

THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN STOKES COUNTY IN NORTH CENTRAL NORTH CAROLINA   
  PATRICK COUNTY IN SOUTHWEST VIRGINIA

* UNTIL 1100 AM EDT

* AT 1020 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 2 MILES WEST OF
  CAPELLA...OR ABOUT 7 MILES EAST OF PILOT MOUNTAIN...MOVING NORTH AT
  45 MPH.

* LOCATIONS IMPACTED INCLUDE...

  VADE MECUM...
  FRANCISCO...
  COLLINSTOWN...
  STUART...
  BUFFALO RIDGE...

WHEN A TORNADO WARNING IS ISSUED BASED ON DOPPLER RADAR...IT MEANS
THAT STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY
ALREADY BE ON THE GROUND...OR IS EXPECTED TO DEVELOP SHORTLY. IF YOU
ARE IN THE PATH OF THIS DANGEROUS STORM...MOVE INDOORS AND TO THE
LOWEST LEVEL OF THE BUILDING. STAY AWAY FROM WINDOWS. IF DRIVING...DO
NOT SEEK SHELTER UNDER A HIGHWAY OVERPASS.

PLEASE RELAY SEVERE WEATHER REPORTS TO THE NATIONAL WEATHER SERVICE 
BY CALLING TOLL FREE...1...8 6 6...2 1 5...4 3 2 4.

A TORNADO WATCH IS IN EFFECT UNTIL 500 PM EDT FRIDAY AFTERNOON FOR 
NORTH CENTRAL NORTH CAROLINA AND SOUTHWESTERN VIRGINIA.

LAT...LON 3636 8043 3632 8013 3665 8007 3686 8016
      3673 8043

$$

WERT

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 17, 11:32 AM EDTTornado WarningRNKHenry, City of Martinsville28 min
Sep 17, 12:01 PM EDTTornado WarningRNKFranklin, Henry, City of Martinsville29 min
Sep 17, 12:26 PM EDTTornado WarningRNKFranklin34 min
Sep 17, 12:31 PM EDTTornado WarningRNKHenry, City of Martinsville29 min
Sep 17, 12:50 PM EDTTornado WarningRNKRoanoke, City of Roanoke, City of Salem25 min
Sep 17, 12:56 PM EDTTornado WarningRNKHalifax34 min
Sep 17, 1:01 PM EDTTornado WarningRNKBedford, Franklin29 min
Sep 17, 1:05 PM EDTTornado WarningRNKFranklin25 min
Sep 17, 1:30 PM EDTTornado WarningRNKBotetourt30 min
Sep 17, 1:44 PM EDTTornado WarningRNKAppomattox, Campbell, Charlotte31 min
Sep 17, 2:11 PM EDTSevere Thunderstorm WarningRNKBedford, Campbell, Halifax, Pittsylvania49 min
Sep 17, 2:15 PM EDTTornado WarningRNKAppomattox30 min
Sep 17, 2:25 PM EDTTornado WarningRNKCampbell, Pittsylvania35 min
Sep 17, 2:29 PM EDTFlash Flood WarningRNKBedford, Campbell, Halifax, Pittsylvania, City of Lynchburg3 hr
Sep 17, 2:39 PM EDTTornado WarningRNKBuckingham21 min
Sep 17, 3:37 PM EDTFlash Flood WarningRNKAmherst, Appomattox3 hr
Sep 17, 3:38 PM EDTSevere Thunderstorm WarningRNKAppomattox, Buckingham, Charlotte, Halifax37 min
Sep 17, 4:03 PM EDTFlash Flood WarningRNKCharlotte3 hr
Sep 17, 4:16 PM EDTSevere Thunderstorm WarningRNKBuckingham29 min
Sep 17, 4:33 PM EDTTornado WarningRNKBuckingham12 min
Sep 17, 11:02 AM EDTTornado WarningRNKRockingham, Stokes28 min

Nearby

Tornado Warnings in Virginia, 2004Tornado Warnings in North Carolina, 2004Every tornado warning in 2004Tornadoes in 2004

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.