Alert archive / Virginia / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 366, NWS Baltimore/Washington

August 11, 20214 counties in Virginia

NWS Baltimore/Washington issued this severe thunderstorm warning at Aug 11, 2021, 3:25 PM EDT for 4 counties in Virginia. It was in force for 50 min. 6 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 11, 2021, 3:25 PM EDT (19:25 UTC)
Expired
Aug 11, 2021, 4:15 PM EDT
In force
50 min
Issued by
NWS Baltimore/Washington
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Culpeper County, VA, Fauquier County, VA, Madison County, VA, Rappahannock County, VA

The radar

The Sterling radar (KLWX), 76 km from the middle of the area, began a volume at 19:26 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 11, 3:45 PM EDTTSTM WND DMG3 N Cardova, VASEVERAL TREES BLEW DOWN ALONG VA-629 SETTLE SCHOOL ROAD.
Aug 11, 3:52 PM EDTTSTM WND DMG3 E Criglersville, VA4 LARGE TREES DOWN
Aug 11, 3:54 PM EDTTSTM WND DMG2 Wsw Fordsville, VANUMEROUS TREES DOWN NEAR THE FORDSVILLE AREAS
Aug 11, 3:54 PM EDTHAIL 1.753 E Criglersville, VA
Aug 11, 3:55 PM EDTTSTM WND DMG1 Wsw Jeffersonton, VASEVERAL TREES BLEW DOWN NEAR THE INTERSECTION OF VA-626 BLACK HILL ROAD AND VA-229 RIXEYVILLE ROAD.
Aug 11, 4:08 PM EDTTSTM WND DMGCulpeper, VASEVERAL TREES AND WIRES BLEW DOWN IN CULPEPER.

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

The watch it was issued in

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

IssuedProductOfficeLasted
Aug 11, 2:02 PM EDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 7.4 hours before the alert went out and 80 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, Washington/Dulle, VA at 12:00Z on 2021-08-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 553 joules per kilogram.LCLLFCEL10008507005003002001001 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, Washington/Dulle, VA at 12:00Z on 2021-08-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 20 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
553 J/kg
Mixed-layer CIN
-190 J/kg
Mixed-layer LCL
1301 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
20 m²/s²
0-3 km storm-relative helicity
77 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

174 
WUUS51 KLWX 111925
SVRLWX
VAC047-061-113-157-112015-
/O.NEW.KLWX.SV.W.0366.210811T1925Z-210811T2015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Baltimore MD/Washington DC
325 PM EDT Wed Aug 11 2021

The National Weather Service in Sterling Virginia has issued a

* Severe Thunderstorm Warning for...
  Central Madison County in northwestern Virginia...
  Southeastern Rappahannock County in northwestern Virginia...
  Central Fauquier County in northern Virginia...
  Western Culpeper County in northern Virginia...

* Until 415 PM EDT.

* At 325 PM EDT, a severe thunderstorm was located near Madison,
  moving east at 15 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Damaging winds will cause some trees and large branches 
           to fall. This could injure those outdoors, as well as 
           damage homes and vehicles. Roadways may become blocked by 
           downed trees. Localized power outages are possible. 
           Unsecured light objects may become projectiles.

* Locations impacted include...
  Culpeper, Warrenton, Brightwood, Castleton, Catalpa, Hackleys
  Crossroads, Haywood, Amissville, Jeffersonton, Syria, Turnbull,
  Winston, Banco, Cardova, Reva, Rixeyville, Leon, Alanthus, Boston
  and Criglersville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3840 7842 3852 7834 3861 7812 3874 7803
      3873 7779 3838 7803
TIME...MOT...LOC 1925Z 265DEG 12KT 3847 7826 

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

$$

KJP
3 follow-up statements
128 
WWUS51 KLWX 111933
SVSLWX

Severe Weather Statement
National Weather Service Baltimore MD/Washington DC
333 PM EDT Wed Aug 11 2021

VAC047-061-113-157-112015-
/O.CON.KLWX.SV.W.0366.000000T0000Z-210811T2015Z/
Madison VA-Rappahannock VA-Fauquier VA-Culpeper VA-
333 PM EDT Wed Aug 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM EDT
FOR CENTRAL MADISON...SOUTHEASTERN RAPPAHANNOCK...CENTRAL FAUQUIER
AND WESTERN CULPEPER COUNTIES...

At 333 PM EDT, a severe thunderstorm was located near Madison, moving
east at 15 mph.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Damaging winds will cause some trees and large branches to 
         fall. This could injure those outdoors, as well as damage 
         homes and vehicles. Roadways may become blocked by downed 
         trees. Localized power outages are possible. Unsecured 
         light objects may become projectiles.

Locations impacted include...
Culpeper, Warrenton, Brightwood, Castleton, Catalpa, Hackleys
Crossroads, Haywood, Amissville, Jeffersonton, Syria, Turnbull,
Winston, Banco, Cardova, Reva, Rixeyville, Leon, Alanthus, Boston and
Criglersville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3840 7842 3852 7834 3861 7812 3874 7803
      3873 7779 3838 7803
TIME...MOT...LOC 1933Z 265DEG 12KT 3847 7823 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

DHOF
816 
WWUS51 KLWX 111951
SVSLWX

Severe Weather Statement
National Weather Service Baltimore MD/Washington DC
351 PM EDT Wed Aug 11 2021

VAC047-061-113-157-112015-
/O.CON.KLWX.SV.W.0366.000000T0000Z-210811T2015Z/
Madison VA-Rappahannock VA-Fauquier VA-Culpeper VA-
351 PM EDT Wed Aug 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM EDT
FOR EAST CENTRAL MADISON...SOUTHEASTERN RAPPAHANNOCK...CENTRAL
FAUQUIER AND WESTERN CULPEPER COUNTIES...

At 351 PM EDT, a severe thunderstorm was located 8 miles west of
Culpeper, moving east at 15 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Damaging winds will cause some trees and large branches to 
         fall. This could injure those outdoors, as well as damage 
         homes and vehicles. Roadways may become blocked by downed 
         trees. Localized power outages are possible. Unsecured 
         light objects may become projectiles.

Locations impacted include...
Culpeper, Warrenton, Brightwood, Castleton, Catalpa, Slate Mills,
Viewtown, Hackleys Crossroads, Amissville, Jeffersonton, Turnbull,
Winston, Cardova, Reva, Rixeyville, Fordsville, Leon, Alanthus and
Boston.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3839 7823 3854 7823 3861 7812 3874 7803
      3873 7779 3838 7803
TIME...MOT...LOC 1951Z 270DEG 12KT 3847 7815 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

DHOF
109 
WWUS51 KLWX 112008
SVSLWX

Severe Weather Statement
National Weather Service Baltimore MD/Washington DC
408 PM EDT Wed Aug 11 2021

VAC047-061-113-157-112018-
/O.EXP.KLWX.SV.W.0366.000000T0000Z-210811T2015Z/
Madison VA-Rappahannock VA-Fauquier VA-Culpeper VA-
408 PM EDT Wed Aug 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL MADISON...
SOUTHEASTERN RAPPAHANNOCK...CENTRAL FAUQUIER AND WESTERN CULPEPER
COUNTIES WILL EXPIRE AT 415 PM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
northern and northwestern Virginia.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Sterling Virginia.

LAT...LON 3839 7823 3854 7823 3861 7812 3874 7803
      3873 7779 3838 7803
TIME...MOT...LOC 2008Z 270DEG 12KT 3847 7809 

$$

DHOF

The office that day

Everything else NWS Baltimore/Washington issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 10, 8:37 PM EDTSpecial Marine WarningLWX59 min
Aug 11, 1:33 PM EDTSmall Craft AdvisoryLWX8 hr
Aug 11, 1:59 PM EDTSevere Thunderstorm WarningLWXFrederick, Shenandoah, Warren46 min
Aug 11, 2:06 PM EDTSevere Thunderstorm WarningLWXPage, Rockingham39 min
Aug 11, 2:11 PM EDTSevere Thunderstorm WarningLWXRockingham, City of Harrisonburg49 min
Aug 11, 2:26 PM EDTSevere Thunderstorm WarningLWXClarke, Frederick, Page, Shenandoah, Warren38 min
Aug 11, 2:44 PM EDTSevere Thunderstorm WarningLWXShenandoah46 min
Aug 11, 2:49 PM EDTSevere Thunderstorm Warning Considerable damage threatLWXClarke, Fauquier, Loudoun, Rappahannock, Warren41 min
Aug 11, 2:52 PM EDTSevere Thunderstorm WarningLWXGreene, Madison38 min
Aug 11, 2:53 PM EDTSevere Thunderstorm Warning Destructive damage threatLWXFauquier, Rappahannock39 min
Aug 11, 2:59 PM EDTSevere Thunderstorm WarningLWXLoudoun46 min
Aug 11, 3:18 PM EDTSevere Thunderstorm WarningLWXFauquier, Loudoun, Rappahannock42 min
Aug 11, 3:19 PM EDTSevere Thunderstorm WarningLWXShenandoah12 min
Aug 11, 3:37 PM EDTSevere Thunderstorm WarningLWXAlbemarle, City of Charlottesville53 min
Aug 11, 3:42 PM EDTSevere Thunderstorm WarningLWXLoudoun48 min
Aug 11, 3:46 PM EDTSevere Thunderstorm WarningLWXFrederick, Shenandoah, City of Winchester25 min
Aug 11, 3:50 PM EDTSevere Thunderstorm WarningLWXCulpeper, Madison, Orange29 min
Aug 11, 4:01 PM EDTSpecial Marine WarningLWX119 min
Aug 11, 4:06 PM EDTSevere Thunderstorm WarningLWXCulpeper, Fauquier39 min
Aug 11, 4:20 PM EDTSevere Thunderstorm WarningLWXArlington, Fairfax, City of Alexandria, City of Fairfax, City of Falls Church40 min
Aug 11, 4:28 PM EDTSpecial Marine WarningLWX2 hr
Aug 11, 4:38 PM EDTSpecial Marine WarningLWX2 hr
Aug 11, 4:38 PM EDTSevere Thunderstorm WarningLWXPrince William, Stafford41 min
Aug 11, 5:06 PM EDTSpecial Marine WarningLWX114 min
Aug 11, 5:24 PM EDTSevere Thunderstorm WarningLWXSpotsylvania36 min
Aug 11, 6:09 PM EDTSpecial Marine WarningLWX2 hr
Aug 11, 6:26 PM EDTSpecial Marine WarningLWX34 min
Aug 11, 6:45 PM EDTSpecial Marine WarningLWX34 min
Aug 11, 7:40 PM EDTSpecial Marine WarningLWX47 min

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.