Alert archive / Virginia / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 39, NWS Baltimore/Washington

May 4, 2021Spotsylvania County, Stafford County, City of Fredericksburg, Virginia

NWS Baltimore/Washington issued this severe thunderstorm warning at May 4, 2021, 4:57 PM EDT for Spotsylvania County, Stafford County, City of Fredericksburg, Virginia. It was in force for 48 min. 3 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
May 4, 2021, 4:57 PM EDT (20:57 UTC)
Expired
May 4, 2021, 5:45 PM EDT
In force
48 min
Issued by
NWS Baltimore/Washington
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties City of Fredericksburg, VA, Spotsylvania County, VA, Stafford County, VA

The radar

The Sterling radar (KLWX), 89 km from the middle of the area, began a volume at 20:58 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
May 4, 5:01 PM EDTTSTM WND DMGSpotsylvania, VAMULTIPLE TREES DOWN NEAR LAKE ANNA IN THE HOLLADAY AND KIRK O'CLIFF NEIGHBORHOODS.
May 4, 5:01 PM EDTTSTM WND DMGSpotsylvania, VAREPORTS OF SEVERAL TREES DOWN IN THE AREA OF THE INTERSECTION OF LEWISTON RD. AND BELFONTE RD.
May 4, 5:03 PM EDTTSTM WND DMG2 Sse Gatewood, VAMULTIPLE DOWNED TREES BLOCKING ROADWAYS IN SOUTHERN SPOTSYLVANIA COUNTY

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
May 4, 1:51 PM EDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 9.0 hours before the alert went out and 87 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 2021-05-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 82 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, Washington/Dulle, VA at 12:00Z on 2021-05-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 115 square meters per square second.193958Sfc1 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
82 J/kg
Mixed-layer CIN
-253 J/kg
Mixed-layer LCL
1036 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
115 m²/s²
0-3 km storm-relative helicity
97 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

355 
WUUS51 KLWX 042057
SVRLWX
VAC177-179-630-042145-
/O.NEW.KLWX.SV.W.0039.210504T2057Z-210504T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Baltimore MD/Washington DC
457 PM EDT Tue May 4 2021

The National Weather Service in Sterling Virginia has issued a

* Severe Thunderstorm Warning for...
  Southern Stafford County in northern Virginia...
  The City of Fredericksburg in central Virginia...
  Spotsylvania County in central Virginia...

* Until 545 PM EDT.

* At 456 PM EDT, severe thunderstorms were located along a line
  extending from 12 miles east of Orange to near Mineral, moving east
  at 40 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Law enforcement. These storms have a history of producing 
           tree damage.

  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, Massaponax, Spotsylvania, Falmouth, Passapatanzy,
  Stones Corner, Leeland, Brokenburg, Snell, Spring Valley, Alsop,
  Gatewood, Chancellorsville, Partlow, Post Oak, Thornburg, White
  Oak, Brookfield and Cookstown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3801 7771 3803 7773 3803 7775 3805 7775
      3805 7777 3808 7779 3836 7769 3836 7730
      3834 7730 3834 7733 3832 7733 3827 7735
      3825 7733 3825 7735 3824 7738 3799 7764
TIME...MOT...LOC 2056Z 257DEG 36KT 3830 7788 3793 7789 

HAIL...<.75IN
WIND...60MPH
 
$$

ADS
2 follow-up statements
949 
WWUS51 KLWX 042126
SVSLWX

Severe Weather Statement
National Weather Service Baltimore MD/Washington DC
526 PM EDT Tue May 4 2021

VAC177-179-630-042145-
/O.CON.KLWX.SV.W.0039.000000T0000Z-210504T2145Z/
Stafford VA-City of Fredericksburg VA-Spotsylvania VA-
526 PM EDT Tue May 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR SOUTHERN STAFFORD AND EASTERN SPOTSYLVANIA COUNTIES AND THE CITY
OF FREDERICKSBURG...

At 526 PM EDT, severe thunderstorms were located along a line
extending from near Fredericksburg to near Massaponax, moving east at
45 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...
Fredericksburg, Massaponax, Spotsylvania, Falmouth, Passapatanzy,
Stones Corner, Chancellorsville, Leeland, Thornburg, White Oak,
Brookfield and Spring Valley.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3807 7756 3836 7768 3836 7730 3834 7730
      3834 7733 3832 7733 3827 7735 3825 7733
      3825 7735 3824 7738
TIME...MOT...LOC 2126Z 250DEG 40KT 3837 7751 3815 7742 

HAIL...<.75IN
WIND...60MPH
 
$$

ADS
527 
WWUS51 KLWX 042145
SVSLWX

Severe Weather Statement
National Weather Service Baltimore MD/Washington DC
545 PM EDT Tue May 4 2021

VAC177-179-630-042155-
/O.EXP.KLWX.SV.W.0039.000000T0000Z-210504T2145Z/
Stafford VA-City of Fredericksburg VA-Spotsylvania VA-
545 PM EDT Tue May 4 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN STAFFORD AND EASTERN
SPOTSYLVANIA COUNTIES AND THE CITY OF FREDERICKSBURG HAS EXPIRED...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning has been allowed to expire.

A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
central and northern 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 3807 7756 3836 7768 3836 7730 3834 7730
      3834 7733 3832 7733 3827 7735 3825 7733
      3825 7735 3824 7738
TIME...MOT...LOC 2145Z 257DEG 36KT 3841 7731 3819 7722 

$$

ADS

The office that day

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

IssuedProductOfficeCountiesLasted
May 3, 10:01 PM EDTSpecial Marine WarningLWX89 min
May 4, 4:08 AM EDTGale WatchLWX24 hr
May 4, 4:08 AM EDTSmall Craft AdvisoryLWX50 hr
May 4, 1:48 PM EDTSevere Thunderstorm WarningLWXRockingham, Shenandoah42 min
May 4, 1:52 PM EDTSevere Thunderstorm WarningLWXRockingham, Shenandoah38 min
May 4, 2:15 PM EDTSevere Thunderstorm WarningLWXAugusta, City of Staunton24 min
May 4, 2:27 PM EDTSevere Thunderstorm WarningLWXPage, Rockingham, Shenandoah48 min
May 4, 2:32 PM EDTSevere Thunderstorm WarningLWXAugusta, City of Waynesboro43 min
May 4, 2:57 PM EDTSevere Thunderstorm WarningLWXAugusta, Nelson48 min
May 4, 3:08 PM EDTSevere Thunderstorm WarningLWXFauquier, Page, Rappahannock, Shenandoah, Warren52 min
May 4, 3:31 PM EDTSevere Thunderstorm WarningLWXCulpeper, Madison32 min
May 4, 3:36 PM EDTSevere Thunderstorm WarningLWXAlbemarle, Nelson39 min
May 4, 3:46 PM EDTAreal Flood WarningLWXPage, Rockingham, Shenandoah9 hr
May 4, 3:57 PM EDTSevere Thunderstorm WarningLWXCulpeper, Fauquier, Prince William, Rappahannock, City of Manassas, City of Manassas Park39 min
May 4, 4:00 PM EDTFlash Flood Warning Considerable damage threatLWXPage, Rockingham, Shenandoah3 hr
May 4, 4:01 PM EDTSevere Thunderstorm WarningLWXFairfax, Fauquier, Loudoun, Prince William44 min
May 4, 4:08 PM EDTSevere Thunderstorm WarningLWXAlbemarle, City of Charlottesville36 min
May 4, 4:22 PM EDTSpecial Marine WarningLWX68 min
May 4, 4:26 PM EDTSevere Thunderstorm WarningLWXArlington, Fairfax, Fauquier, Loudoun, Prince William, Stafford and 5 more49 min
May 4, 4:41 PM EDTSevere Thunderstorm WarningLWXOrange, Spotsylvania37 min
May 4, 5:01 PM EDTSpecial Marine WarningLWX89 min
May 4, 5:16 PM EDTSpecial Marine WarningLWX119 min
May 4, 5:24 PM EDTSevere Thunderstorm WarningLWXKing George51 min
May 4, 5:55 PM EDTSpecial Marine WarningLWX95 min
May 4, 6:27 PM EDTSpecial Marine WarningLWX93 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.