Alert archive / Virginia / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 421, NWS Baltimore/Washington

August 13, 20214 counties in Virginia; Charles County, Maryland

NWS Baltimore/Washington issued this severe thunderstorm warning at Aug 13, 2021, 6:05 PM EDT for 4 counties in Virginia; Charles County, Maryland. It was in force for 40 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 13, 2021, 6:05 PM EDT (22:05 UTC)
Expired: Aug 13, 2021, 6:45 PM EDT
In force: 40 min
Issued by: NWS Baltimore/Washington
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Charles County, MD, City of Fredericksburg, VA, King George County, VA, Spotsylvania County, VA, Stafford County, VA

The radar

The Sterling radar (KLWX), 79 km from the middle of the area, began a volume at 22:06 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

Time	Report	Where	Remark
Aug 13, 6:10 PM EDT	TSTM WND DMG	White Oak, VA	SEVERAL TREES DOWN IN THE WHITE OAK AREA.
Aug 13, 6:15 PM EDT	TSTM WND DMG	4 Nw Fairview Beach, VA	TREES DOWN ON VA-621 MARLBOROUGH POINT ROAD NEAR POTOMAC OVERLOOK LANE.
Aug 13, 6:25 PM EDT	TSTM WND DMG	2 N Lambs Creek, VA	TREES DOWN NEAR THE INTERSECTION OF VA-694 LAMBS CREEK CHURCH ROAD AND VA-608 IGO ROAD.
Aug 13, 6:27 PM EDT	TSTM WND DMG	2 Sse Dogue, VA	TREES DOWN NEAR THE INTERSECTION OF VA-607 PORT CONWAY ROAD AND VA-660 CANNING WAY.
Aug 13, 6:34 PM EDT	TSTM WND DMG	2 Nw Weedonville, VA	TREES DOWN NEAR THE INTERSECTION OF VA-218 CALEDON ROAD AND BLUFF WAY.
Aug 13, 6:35 PM EDT	TSTM WND DMG	King George, VA	THERE WERE ABOUT TWO DOZEN CALLS FOR TREES AND WIRES DOWN THROUGHOUT THE COUNTY. SEVERAL CARS STRUCK FALLEN TREES IN THE ROADWAY, BUT NO INJURIES WERE REPORTED.

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.

Issued	Product	Office	Lasted
Aug 13, 1:11 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 10.1 hours before the alert went out and 75 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: 313 J/kg
Mixed-layer CIN: -199 J/kg
Mixed-layer LCL: 1675 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -11 m²/s²
0-3 km storm-relative helicity: 58 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

622 
WUUS51 KLWX 132205
SVRLWX
MDC017-VAC099-177-179-630-132245-
/O.NEW.KLWX.SV.W.0421.210813T2205Z-210813T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Baltimore MD/Washington DC
605 PM EDT Fri Aug 13 2021

The National Weather Service in Sterling Virginia has issued a

* Severe Thunderstorm Warning for...
  West central Charles County in southern Maryland...
  Southeastern Stafford County in northern Virginia...
  Western King George County in central Virginia...
  The southeastern City of Fredericksburg in central Virginia...
  East central Spotsylvania County in central Virginia...

* Until 645 PM EDT.

* At 605 PM EDT, a severe thunderstorm was located near
  Fredericksburg, 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...
  Fredericksburg, King George, Fairview Beach, Potomac Creek, Port
  Royal, Falmouth, Passapatanzy, Stones Corner, Leeland, Weedonville,
  Brooke, Lambs Creek, White Oak, Sealston, Brookfield and Dogue.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3820 7722 3819 7725 3823 7725 3824 7722
      3825 7725 3825 7727 3822 7729 3824 7729
      3825 7735 3822 7740 3825 7750 3841 7742
      3837 7734 3839 7729 3836 7724 3840 7726
      3841 7710 3839 7712 3839 7711 3817 7719
TIME...MOT...LOC 2205Z 264DEG 11KT 3831 7740 

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

$$

KJP

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 13, 2:36 AM EDT	Special Marine Warning	LWX		36 min
Aug 13, 1:28 PM EDT	Severe Thunderstorm Warning	LWX	Rockingham	47 min
Aug 13, 1:59 PM EDT	Severe Thunderstorm Warning	LWX	Augusta, Rockingham, City of Harrisonburg, City of Staunton	30 min
Aug 13, 2:18 PM EDT	Severe Thunderstorm Warning	LWX	Frederick, Shenandoah, City of Winchester	42 min
Aug 13, 2:19 PM EDT	Severe Thunderstorm Warning	LWX	Page, Rockingham, Shenandoah, City of Harrisonburg	41 min
Aug 13, 2:24 PM EDT	Severe Thunderstorm Warning	LWX	Rockingham	22 min
Aug 13, 2:38 PM EDT	Severe Thunderstorm Warning	LWX	Clarke	35 min
Aug 13, 2:51 PM EDT	Severe Thunderstorm Warning	LWX	Albemarle, Augusta, Nelson, City of Waynesboro	24 min
Aug 13, 2:55 PM EDT	Severe Thunderstorm Warning	LWX	Albemarle, Augusta, Greene, Page, Rockingham	50 min
Aug 13, 2:59 PM EDT	Severe Thunderstorm Warning	LWX	Clarke, Frederick, Warren	34 min
Aug 13, 3:01 PM EDT	Severe Thunderstorm Warning	LWX	Augusta, Nelson	23 min
Aug 13, 3:05 PM EDT	Severe Thunderstorm Warning Considerable damage threat	LWX	Greene, Madison, Orange	25 min
Aug 13, 3:16 PM EDT	Flash Flood Warning Considerable damage threat	LWX	Albemarle, Augusta, Nelson, City of Waynesboro	100 min
Aug 13, 3:18 PM EDT	Severe Thunderstorm Warning	LWX	Albemarle, Augusta, Nelson, City of Waynesboro	42 min
Aug 13, 3:26 PM EDT	Severe Thunderstorm Warning	LWX	Frederick, Shenandoah, Warren	25 min
Aug 13, 3:30 PM EDT	Severe Thunderstorm Warning	LWX	Greene, Madison, Orange, Page	45 min
Aug 13, 3:35 PM EDT	Flash Flood Warning Considerable damage threat	LWX	Orange	3 hr
Aug 13, 3:53 PM EDT	Severe Thunderstorm Warning	LWX	Albemarle, Greene, Madison, Orange	52 min
Aug 13, 4:02 PM EDT	Severe Thunderstorm Warning	LWX	Nelson	43 min
Aug 13, 4:05 PM EDT	Severe Thunderstorm Warning	LWX	Fairfax, Loudoun	40 min
Aug 13, 4:28 PM EDT	Severe Thunderstorm Warning Considerable damage threat	LWX	Fauquier, Prince William	47 min
Aug 13, 4:32 PM EDT	Special Marine Warning	LWX		88 min
Aug 13, 4:32 PM EDT	Severe Thunderstorm Warning Considerable damage threat	LWX	Fauquier, Prince William	43 min
Aug 13, 4:35 PM EDT	Severe Thunderstorm Warning Considerable damage threat	LWX	Culpeper, Fauquier	27 min
Aug 13, 4:43 PM EDT	Special Marine Warning	LWX		2 hr
Aug 13, 4:46 PM EDT	Severe Thunderstorm Warning	LWX	Fairfax, Loudoun, City of Falls Church	29 min
Aug 13, 5:03 PM EDT	Special Marine Warning	LWX		87 min
Aug 13, 5:05 PM EDT	Special Marine Warning	LWX		115 min
Aug 13, 5:11 PM EDT	Severe Thunderstorm Warning	LWX	Arlington, Fairfax, Prince William, City of Alexandria, City of Fairfax, City of Falls Church and 2 more	49 min
Aug 13, 5:14 PM EDT	Severe Thunderstorm Warning Destructive damage threat	LWX	Fauquier, Prince William	31 min
Aug 13, 5:16 PM EDT	Severe Thunderstorm Warning	LWX	Fauquier, Prince William, Stafford, City of Manassas	44 min
Aug 13, 5:18 PM EDT	Special Marine Warning	LWX		104 min
Aug 13, 5:27 PM EDT	Special Marine Warning	LWX		93 min
Aug 13, 5:43 PM EDT	Special Marine Warning	LWX		92 min
Aug 13, 5:56 PM EDT	Severe Thunderstorm Warning	LWX	Arlington, Fairfax, Prince William, Stafford, City of Alexandria, City of Falls Church	49 min
Aug 13, 6:09 PM EDT	Special Marine Warning	LWX		96 min
Aug 13, 6:19 PM EDT	Special Marine Warning	LWX		56 min
Aug 13, 6:26 PM EDT	Special Marine Warning	LWX		64 min
Aug 13, 6:33 PM EDT	Severe Thunderstorm Warning	LWX	King George	42 min
Aug 13, 6:55 PM EDT	Special Marine Warning	LWX		95 min
Aug 13, 7:15 PM EDT	Special Marine Warning	LWX		60 min
Aug 13, 1:43 PM EDT	Severe Thunderstorm Warning	LWX	Allegany, Washington	47 min
Aug 13, 3:36 PM EDT	Severe Thunderstorm Warning	LWX	Frederick	39 min
Aug 13, 3:50 PM EDT	Severe Thunderstorm Warning	LWX	Montgomery	40 min
Aug 13, 4:30 PM EDT	Severe Thunderstorm Warning Considerable damage threat	LWX	Carroll, Howard, Montgomery	45 min
Aug 13, 4:42 PM EDT	Severe Thunderstorm Warning	LWX	Baltimore, City of Baltimore	48 min
Aug 13, 4:49 PM EDT	Severe Thunderstorm Warning Considerable damage threat	LWX	Anne Arundel, Baltimore, Howard, Montgomery, Prince George's, City of Baltimore	41 min
Aug 13, 4:49 PM EDT	Severe Thunderstorm Warning	LWX	Baltimore, Harford	41 min
Aug 13, 4:59 PM EDT	Severe Thunderstorm Warning	LWX	Baltimore, Harford	46 min
Aug 13, 5:20 PM EDT	Severe Thunderstorm Warning	LWX	Baltimore, Harford, City of Baltimore	40 min
Aug 13, 5:22 PM EDT	Severe Thunderstorm Warning	LWX	Harford	38 min
Aug 13, 5:25 PM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel, Calvert, Prince George's	50 min
Aug 13, 5:35 PM EDT	Severe Thunderstorm Warning Considerable damage threat	LWX	Anne Arundel, Prince George's	25 min
Aug 13, 5:52 PM EDT	Severe Thunderstorm Warning	LWX	Cecil, Harford	24 min
Aug 13, 6:01 PM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel, Prince George's	44 min
Aug 13, 6:06 PM EDT	Areal Flood Warning	LWX	Montgomery	114 min
Aug 13, 6:10 PM EDT	Areal Flood Warning	LWX	Baltimore, City of Baltimore	110 min
Aug 13, 6:15 PM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel, Calvert, Prince George's	45 min
Aug 13, 7:07 PM EDT	Severe Thunderstorm Warning	LWX	Calvert, Charles, Saint Mary's	39 min
Aug 13, 7:11 PM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel, Calvert, Charles, Prince George's, Saint Mary's	34 min
Aug 13, 7:41 PM EDT	Severe Thunderstorm Warning	LWX	Calvert, Saint Mary's	21 min

Nearby

Severe Thunderstorm Warnings in Virginia, 2021 Severe Thunderstorm Warnings in Maryland, 2021 Every 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.