Alert archive / Virginia / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 310, NWS Baltimore/Washington
NWS Baltimore/Washington issued this severe thunderstorm warning at Jul 30, 2020, 6:43 PM EDT for 4 counties in Virginia; Charles County, Maryland. It was in force for 47 min. 4 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
- Jul 30, 2020, 6:43 PM EDT (22:43 UTC)
- Expired
- Jul 30, 2020, 7:30 PM EDT
- In force
- 47 min
- Issued by
- NWS Baltimore/Washington
- Area
- Storm-based polygon
- Hail
- 0.75 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), 77 km from the middle of the area, began a volume at 22:44 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 |
|---|---|---|---|
| Jul 30, 6:57 PM EDT | TSTM WND DMG | 1 Wsw Weedonville, VA | DOWNED TREE NEAR THE INTERSECTION OF VA 206 (DAHLGREN RD) AND VA 610 (INDIANTOWN RD) |
| Jul 30, 7:10 PM EDT | TSTM WND DMG | Nanjemoy, MD | MULTIPLE TREES DOWN AROUND NANJEMOY |
| Jul 30, 7:11 PM EDT | MARINE TSTM WIND 40 | 2 Se Dahlgren, VA | |
| Jul 30, 7:25 PM EDT | TSTM WND DMG | Marbury, MD | MULTIPLE TREES DOWN AROUND MARBURY |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 10.7 hours before the alert went out and 71 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.
- Mixed-layer CAPE
- 20 J/kg
- Mixed-layer CIN
- -178 J/kg
- Mixed-layer LCL
- 1679 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- -22 m²/s²
- 0-3 km storm-relative helicity
- 58 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
666
WUUS51 KLWX 302243
SVRLWX
MDC017-VAC099-177-179-630-302330-
/O.NEW.KLWX.SV.W.0310.200730T2243Z-200730T2330Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Baltimore MD/Washington DC
643 PM EDT Thu Jul 30 2020
The National Weather Service in Sterling Virginia has issued a
* Severe Thunderstorm Warning for...
Southwestern Charles County in southern Maryland...
Southeastern Stafford County in northern Virginia...
King George County in central Virginia...
The City of Fredericksburg in central Virginia...
Northeastern Spotsylvania County in central Virginia...
* Until 730 PM EDT.
* At 642 PM EDT, severe thunderstorms were located along a line
extending from near Fredericksburg to 6 miles northwest of Port
Royal to 6 miles southeast of Bowling Green, moving northeast at 35
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...
Stafford, Fredericksburg, La Plata, King George, Dahlgren,
Quantico, Fairview Beach, Nanjemoy Creek, Popes Creek, Aquia Creek,
Potomac Creek, Port Tobacco River, Cherry Hill, Falmouth,
Passapatanzy, Port Tobacco Village, Issue, Tompkinsville, Ramoth
and Pisgah.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3826 7688 3835 7700 3828 7698 3826 7704
3814 7707 3820 7722 3819 7725 3825 7724
3825 7727 3822 7728 3825 7737 3819 7744
3828 7762 3853 7738 3850 7730 3861 7725
3856 7724 3859 7719 3851 7692 3830 7683
TIME...MOT...LOC 2242Z 219DEG 30KT 3831 7758 3821 7731 3800 7724
HAIL...<.75IN
WIND...60MPH
$$
JMG1 follow-up statement
794
WWUS51 KLWX 302317
SVSLWX
Severe Weather Statement
National Weather Service Baltimore MD/Washington DC
717 PM EDT Thu Jul 30 2020
VAC177-630-302327-
/O.CAN.KLWX.SV.W.0310.000000T0000Z-200730T2330Z/
City of Fredericksburg VA-Spotsylvania VA-
717 PM EDT Thu Jul 30 2020
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN SPOTSYLVANIA
COUNTY AND THE CITY OF FREDERICKSBURG IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
LAT...LON 3826 7688 3835 7700 3828 7698 3826 7704
3827 7705 3837 7729 3853 7738 3850 7730
3855 7728 3856 7726 3858 7727 3861 7725
3856 7724 3859 7719 3851 7692 3839 7687
3838 7688 3837 7686 3830 7683
TIME...MOT...LOC 2317Z 219DEG 30KT 3853 7735 3843 7708 3822 7701
$$
MDC017-VAC099-179-302330-
/O.CON.KLWX.SV.W.0310.000000T0000Z-200730T2330Z/
Charles MD-Stafford VA-King George VA-
717 PM EDT Thu Jul 30 2020
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EDT
FOR SOUTHWESTERN CHARLES...NORTHEASTERN STAFFORD AND NORTHEASTERN
KING GEORGE COUNTIES...
At 717 PM EDT, severe thunderstorms were located along a line
extending from Triangle to near Port Tobacco River to near Colonial
Beach, moving northeast at 35 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...
La Plata, Dahlgren, Quantico, Nanjemoy Creek, Popes Creek, Port
Tobacco River, Cherry Hill, Port Tobacco Village, Issue,
Tompkinsville, Ironsides, Bel Alton, Swan Point, Pisgah, Faulkner,
Berthaville, Marbury, Widewater, Port Tobacco and Ripley.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3826 7688 3835 7700 3828 7698 3826 7704
3827 7705 3837 7729 3853 7738 3850 7730
3855 7728 3856 7726 3858 7727 3861 7725
3856 7724 3859 7719 3851 7692 3839 7687
3838 7688 3837 7686 3830 7683
TIME...MOT...LOC 2317Z 219DEG 30KT 3853 7735 3843 7708 3822 7701
HAIL...<.75IN
WIND...60MPH
$$
JMGThe office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 4:34 PM EDT | Areal Flood Warning | LWX | Augusta, City of Waynesboro | 3 hr |
| Jul 30, 4:59 PM EDT | Special Marine Warning | LWX | 43 min | |
| Jul 30, 5:08 PM EDT | Severe Thunderstorm Warning | LWX | King George | 38 min |
| Jul 30, 5:25 PM EDT | Severe Thunderstorm Warning | LWX | Madison, Page, Rappahannock | 27 min |
| Jul 30, 5:41 PM EDT | Special Marine Warning | LWX | 64 min | |
| Jul 30, 6:04 PM EDT | Special Marine Warning | LWX | 56 min | |
| Jul 30, 6:28 PM EDT | Special Marine Warning | LWX | 92 min | |
| Jul 30, 6:45 PM EDT | Special Marine Warning | LWX | 77 min | |
| Jul 30, 6:58 PM EDT | Special Marine Warning | LWX | 92 min | |
| Jul 30, 7:14 PM EDT | Severe Thunderstorm Warning | LWX | Arlington, Fairfax, King George, Prince William, City of Alexandria, City of Fairfax and 3 more | 46 min |
| Jul 30, 7:49 PM EDT | Special Marine Warning | LWX | 86 min | |
| Jul 30, 1:06 PM EDT | Heat Advisory | LWX | Anne Arundel, Baltimore, Calvert, Harford, Saint Mary's, City of Baltimore | 6 hr |
| Jul 30, 5:34 PM EDT | Severe Thunderstorm Warning | LWX | Charles | 12 min |
| Jul 30, 7:42 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Calvert, Prince George's | 48 min |
Nearby
Severe Thunderstorm Warnings in Virginia, 2020Severe Thunderstorm Warnings in Maryland, 2020Every severe thunderstorm warning in 2020
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.