Alert archive / Virginia / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 167, NWS Blacksburg, VA

August 12, 2021Floyd County, Franklin County, Patrick County, Virginia

NWS Blacksburg, VA issued this severe thunderstorm warning at Aug 12, 2021, 4:49 PM EDT for Floyd County, Franklin County, Patrick County, Virginia. It was in force for 35 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Aug 12, 2021, 4:49 PM EDT (20:49 UTC)
Expired
Aug 12, 2021, 5:24 PM EDT
In force
35 min
Issued by
NWS Blacksburg, VA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Floyd County, VA, Franklin County, VA, Patrick County, VA

The radar

The Roanoke radar (KFCX), 18 km from the middle of the area, began a volume at 20:48 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

TimeReportWhereRemark
Aug 12, 4:53 PM EDTTSTM WND DMG1 N Endicott, VATREE DOWN AT ENDICOTT ROAD AND FRANKLIN STREET.
Aug 12, 5:00 PM EDTTSTM WND DMG2 Ene Floyd, VATWO TREES DOWN ON SHOOTING CREEK ROAD SE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Roanoke, VA (KRNK), launched 12:00Z, 8.8 hours before the alert went out and 73 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, Roanoke, VA at 12:00Z on 2021-08-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 75 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Roanoke, VA at 12:00Z on 2021-08-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -37 square meters per square second.1939Sfc1 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
75 J/kg
Mixed-layer CIN
-176 J/kg
Mixed-layer LCL
1340 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
-37 m²/s²
0-3 km storm-relative helicity
-11 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

431 
WUUS51 KRNK 122049
SVRRNK
VAC063-067-141-122145-
/O.NEW.KRNK.SV.W.0167.210812T2049Z-210812T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service BLACKSBURG VA
449 PM EDT Thu Aug 12 2021

The National Weather Service in BLACKSBURG has issued a

* Severe Thunderstorm Warning for...
  East central Floyd County in southwestern Virginia...
  Southwestern Franklin County in west central Virginia...
  Northeastern Patrick County in southwestern Virginia...

* Until 545 PM EDT.

* At 449 PM EDT, a severe thunderstorm was located near Endicott, or
  near Floyd, moving northeast at 10 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Floyd...
  Charity...
  and Endicott.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. For your
safety, move to an interior room on the lowest floor of a sturdy
building. Stay away from windows.

When it is safe to do so, please send your reports of hail of any
size, as well as reports of any wind damage, including downed trees
or large limbs, to the National Weather Service by calling toll free
at 1...8 6 6...2 1 5...4 3 2 4. Reports and pictures can also be
shared on the National Weather Service Blacksburg Facebook page and
on Twitter.

&&

LAT...LON 3677 8024 3684 8031 3694 8034 3705 8014
      3685 8001
TIME...MOT...LOC 2049Z 241DEG 9KT 3687 8021 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

SH
2 follow-up statements
358 
WWUS51 KRNK 122107
SVSRNK

Severe Weather Statement
National Weather Service BLACKSBURG VA
507 PM EDT Thu Aug 12 2021

VAC063-067-141-122145-
/O.CON.KRNK.SV.W.0167.000000T0000Z-210812T2145Z/
Floyd VA-Franklin VA-Patrick VA-
507 PM EDT Thu Aug 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR
EAST CENTRAL FLOYD...SOUTHWESTERN FRANKLIN AND NORTHEASTERN PATRICK
COUNTIES...

At 507 PM EDT, a severe thunderstorm was located near Floyd, moving
east at 5 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Charity...
and Endicott.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for LARGE HAIL AND DAMAGING WINDS. For your
safety, move to an interior room on the lowest floor of a sturdy
building. Stay away from windows.

When it is safe to do so, please send your reports of hail of any
size, as well as reports of any wind damage, including downed trees
or large limbs, to the National Weather Service by calling toll free
at 1...8 6 6...2 1 5...4 3 2 4. Reports and pictures can also be
shared on the National Weather Service Blacksburg Facebook page and
on Twitter.

&&

LAT...LON 3678 8021 3687 8028 3695 8032 3705 8014
      3685 8001
TIME...MOT...LOC 2107Z 265DEG 6KT 3690 8024 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

SH
315 
WWUS51 KRNK 122124
SVSRNK

Severe Weather Statement
National Weather Service BLACKSBURG VA
524 PM EDT Thu Aug 12 2021

VAC063-067-141-122134-
/O.CAN.KRNK.SV.W.0167.000000T0000Z-210812T2145Z/
Floyd VA-Franklin VA-Patrick VA-
524 PM EDT Thu Aug 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR 
EAST CENTRAL FLOYD...SOUTHWESTERN FRANKLIN AND NORTHEASTERN PATRICK
COUNTIES IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.

LAT...LON 3678 8021 3687 8028 3695 8032 3705 8014
      3685 8001
TIME...MOT...LOC 2123Z 241DEG 9KT 3692 8019 

$$

SH

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 12, 9:54 AM EDTHeat AdvisoryRNKBuckingham9 hr
Aug 12, 12:28 PM EDTSpecial Weather StatementRNKGrayson32 min
Aug 12, 1:04 PM EDTSpecial Weather StatementRNKRoanoke, City of Roanoke, City of Salem26 min
Aug 12, 1:17 PM EDTSevere Thunderstorm WarningRNKBedford, Franklin, Roanoke, City of Roanoke, City of Salem38 min
Aug 12, 1:30 PM EDTSpecial Weather StatementRNKAlleghany30 min
Aug 12, 2:03 PM EDTSpecial Weather StatementRNKCity of Roanoke27 min
Aug 12, 2:09 PM EDTSpecial Weather StatementRNKPittsylvania36 min
Aug 12, 2:12 PM EDTSevere Thunderstorm WarningRNKBedford, Campbell, Franklin, Pittsylvania, Roanoke63 min
Aug 12, 2:15 PM EDTSpecial Weather StatementRNKAlleghany, City of Covington30 min
Aug 12, 2:24 PM EDTSpecial Weather StatementRNKHenry36 min
Aug 12, 2:57 PM EDTSevere Thunderstorm WarningRNKHenry, Patrick51 min
Aug 12, 3:18 PM EDTSevere Thunderstorm WarningRNKFranklin29 min
Aug 12, 3:27 PM EDTSevere Thunderstorm WarningRNKCarroll, Wythe48 min
Aug 12, 3:34 PM EDTSpecial Weather StatementRNKCity of Lexington26 min
Aug 12, 3:37 PM EDTSevere Thunderstorm WarningRNKCraig, Montgomery, Roanoke53 min
Aug 12, 3:43 PM EDTSevere Thunderstorm WarningRNKFranklin32 min
Aug 12, 3:51 PM EDTSpecial Weather StatementRNKPatrick24 min
Aug 12, 3:58 PM EDTSevere Thunderstorm WarningRNKPatrick47 min
Aug 12, 4:14 PM EDTSpecial Weather StatementRNKCity of Salem31 min
Aug 12, 4:14 PM EDTSpecial Weather StatementRNKCity of Salem31 min
Aug 12, 4:16 PM EDTSevere Thunderstorm WarningRNKFloyd, Patrick29 min
Aug 12, 4:20 PM EDTSevere Thunderstorm WarningRNKFranklin, Roanoke27 min
Aug 12, 4:24 PM EDTSpecial Weather StatementRNKFloyd36 min
Aug 12, 4:26 PM EDTSpecial Weather StatementRNKGrayson34 min
Aug 12, 4:44 PM EDTSpecial Weather StatementRNKCity of Danville31 min
Aug 12, 7:42 PM EDTHeat AdvisoryRNKAppomattox, Buckingham, Campbell, Charlotte, City of Lynchburg23 hr

Nearby

Severe Thunderstorm Warnings in Virginia, 2021Every severe thunderstorm warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.