Alert archive / Virginia / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 331, NWS Baltimore/Washington
NWS Baltimore/Washington issued this severe thunderstorm warning at Aug 10, 2021, 4:42 PM EDT for 4 counties in Virginia. It was in force for 48 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 10, 2021, 4:42 PM EDT (20:42 UTC)
- Expired
- Aug 10, 2021, 5:30 PM EDT
- In force
- 48 min
- Issued by
- NWS Baltimore/Washington
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Culpeper County, VA, Fauquier County, VA, Madison County, VA, Rappahannock County, VA
The radar
The Sterling radar (KLWX), 62 km from the middle of the area, began a volume at 20:43 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 10, 5:00 PM EDT | TSTM WND DMG | 2 Ne Etlan, VA | ABOUT A DOZEN TREES BLEW DOWN ALONG VA-231 F T VALLEY ROAD AND NETHERS ROAD. |
| Aug 10, 5:04 PM EDT | TSTM WND DMG | 2 Nw Hackleys Crossroad, VA | SEVERAL TREES BLEW DOWN ALONG GRIMSLEY ROAD. |
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, 8.7 hours before the alert went out and 68 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
- 529 J/kg
- Mixed-layer CIN
- -120 J/kg
- Mixed-layer LCL
- 1096 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 37 m²/s²
- 0-3 km storm-relative helicity
- 65 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
826
WUUS51 KLWX 102042
SVRLWX
VAC047-061-113-157-102130-
/O.NEW.KLWX.SV.W.0331.210810T2042Z-210810T2130Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Baltimore MD/Washington DC
442 PM EDT Tue Aug 10 2021
The National Weather Service in Sterling Virginia has issued a
* Severe Thunderstorm Warning for...
Northeastern Madison County in northwestern Virginia...
Rappahannock County in northwestern Virginia...
West central Fauquier County in northern Virginia...
West central Culpeper County in northern Virginia...
* Until 530 PM EDT.
* At 441 PM EDT, severe thunderstorms were located along a line
extending from 8 miles south of Front Royal to near Sperryville,
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...
Sperryville, Hume, Chester Gap, Flint Hill, Washington, Castleton,
Huntly, Slate Mills, Etlan, Nethers, Woodville, Hackleys
Crossroads, Cresthill, Five Forks, Rock Mills, Reva and Boston.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3885 7796 3846 7813 3855 7837 3877 7823
3878 7819 3883 7817 3887 7813
TIME...MOT...LOC 2041Z 265DEG 12KT 3880 7821 3860 7829
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
DHOF3 follow-up statements
216
WWUS51 KLWX 102052
SVSLWX
Severe Weather Statement
National Weather Service Baltimore MD/Washington DC
452 PM EDT Tue Aug 10 2021
VAC047-061-113-157-102130-
/O.CON.KLWX.SV.W.0331.000000T0000Z-210810T2130Z/
Madison VA-Rappahannock VA-Fauquier VA-Culpeper VA-
452 PM EDT Tue Aug 10 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR NORTHEASTERN MADISON...RAPPAHANNOCK...WEST CENTRAL FAUQUIER AND
WEST CENTRAL CULPEPER COUNTIES...
At 452 PM EDT, severe thunderstorms were located along a line
extending from 8 miles south of Front Royal to near Sperryville,
moving east at 15 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damaging winds will cause some trees and large branches to
fall. This could injure those outdoors, as well as damage
homes and vehicles. Roadways may become blocked by downed
trees. Localized power outages are possible. Unsecured
light objects may become projectiles.
Locations impacted include...
Sperryville, Hume, Chester Gap, Flint Hill, Washington, Castleton,
Huntly, Slate Mills, Etlan, Nethers, Woodville, Hackleys Crossroads,
Cresthill, Five Forks, Rock Mills, Reva and Boston.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3885 7796 3846 7813 3854 7836 3876 7821
3878 7819 3883 7817 3887 7813
TIME...MOT...LOC 2052Z 265DEG 12KT 3880 7818 3860 7826
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
DHOF128
WWUS51 KLWX 102110
SVSLWX
Severe Weather Statement
National Weather Service Baltimore MD/Washington DC
510 PM EDT Tue Aug 10 2021
VAC113-102119-
/O.CAN.KLWX.SV.W.0331.000000T0000Z-210810T2130Z/
Madison VA-
510 PM EDT Tue Aug 10 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN MADISON COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
LAT...LON 3885 7796 3846 7813 3855 7825 3887 7809
TIME...MOT...LOC 2109Z 265DEG 12KT 3880 7812 3860 7820
$$
VAC047-061-157-102130-
/O.CON.KLWX.SV.W.0331.000000T0000Z-210810T2130Z/
Rappahannock VA-Fauquier VA-Culpeper VA-
510 PM EDT Tue Aug 10 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR CENTRAL RAPPAHANNOCK...WEST CENTRAL FAUQUIER AND WEST CENTRAL
CULPEPER COUNTIES...
At 509 PM EDT, severe thunderstorms were located along a line
extending from 6 miles west of Hume to near Sperryville, moving east
at 15 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damaging winds will cause some trees and large branches to
fall. This could injure those outdoors, as well as damage
homes and vehicles. Roadways may become blocked by downed
trees. Localized power outages are possible. Unsecured
light objects may become projectiles.
Locations impacted include...
Hume, Flint Hill, Washington, Castleton, Slate Mills, Woodville,
Hackleys Crossroads, Cresthill, Five Forks, Rock Mills, Reva, Boston
and Huntly.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3885 7796 3846 7813 3855 7825 3887 7809
TIME...MOT...LOC 2109Z 265DEG 12KT 3880 7812 3860 7820
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
DHOF845
WWUS51 KLWX 102121
SVSLWX
Severe Weather Statement
National Weather Service Baltimore MD/Washington DC
521 PM EDT Tue Aug 10 2021
VAC047-061-157-102131-
/O.EXP.KLWX.SV.W.0331.000000T0000Z-210810T2130Z/
Rappahannock VA-Fauquier VA-Culpeper VA-
521 PM EDT Tue Aug 10 2021
...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL RAPPAHANNOCK...WEST
CENTRAL FAUQUIER AND WEST CENTRAL CULPEPER COUNTIES WILL EXPIRE AT
530 PM EDT...
The storms which prompted the warning have weakened below severe
limits, and have exited the warned area. Therefore, the warning will
be allowed to expire.
LAT...LON 3885 7796 3846 7813 3855 7825 3887 7809
TIME...MOT...LOC 2121Z 270DEG 12KT 3880 7807 3860 7815
$$
CJLThe office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 1:33 PM EDT | Excessive Heat Watch | LWX | Arlington, Clarke, Fairfax, Fauquier, King George, Loudoun and 6 more | 37 hr |
| Aug 10, 1:33 PM EDT | Heat Advisory | LWX | Arlington, Clarke, Fairfax, Fauquier, King George, Loudoun and 6 more | 29 hr |
| Aug 10, 2:30 PM EDT | Severe Thunderstorm Warning | LWX | Culpeper, Fauquier, Rappahannock | 45 min |
| Aug 10, 2:44 PM EDT | Severe Thunderstorm Warning | LWX | Albemarle, City of Charlottesville | 23 min |
| Aug 10, 3:24 PM EDT | Severe Thunderstorm Warning | LWX | Orange | 34 min |
| Aug 10, 4:15 PM EDT | Severe Thunderstorm Warning | LWX | Fairfax, Prince William, City of Manassas, City of Manassas Park | 31 min |
| Aug 10, 4:34 PM EDT | Severe Thunderstorm Warning | LWX | Fairfax, Loudoun | 41 min |
| Aug 10, 4:44 PM EDT | Severe Thunderstorm Warning | LWX | Fauquier | 19 min |
| Aug 10, 5:05 PM EDT | Severe Thunderstorm Warning | LWX | Nelson | 40 min |
| Aug 10, 5:08 PM EDT | Severe Thunderstorm Warning | LWX | Fairfax | 18 min |
| Aug 10, 5:09 PM EDT | Special Marine Warning | LWX | 96 min | |
| Aug 10, 5:12 PM EDT | Severe Thunderstorm Warning | LWX | Arlington, Fairfax, City of Alexandria, City of Fairfax, City of Falls Church | 48 min |
| Aug 10, 5:16 PM EDT | Severe Thunderstorm Warning | LWX | Clarke, Fauquier, Loudoun | 44 min |
| Aug 10, 5:41 PM EDT | Severe Thunderstorm Warning | LWX | Fairfax, Fauquier, Loudoun, Prince William | 35 min |
| Aug 10, 5:53 PM EDT | Severe Thunderstorm Warning | LWX | Arlington, Fairfax, City of Alexandria | 29 min |
| Aug 10, 6:31 PM EDT | Special Marine Warning | LWX | 64 min | |
| Aug 10, 6:35 PM EDT | Special Marine Warning | LWX | 85 min | |
| Aug 10, 6:50 PM EDT | Special Marine Warning | LWX | 85 min | |
| Aug 10, 6:53 PM EDT | Special Marine Warning | LWX | 69 min | |
| Aug 10, 7:32 PM EDT | Special Marine Warning | LWX | 88 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.