Alert archive / Virginia / Tornado Warnings in 2011
Tornado Warning 2, NWS Baltimore/Washington
NWS Baltimore/Washington issued this tornado warning at Mar 10, 2011, 6:58 PM EST for 5 counties in Virginia; Montgomery County, Maryland. It was in force for 32 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
- Mar 10, 2011, 6:58 PM EST (23:58 UTC)
- Expired
- Mar 10, 2011, 7:30 PM EST
- In force
- 32 min
- Issued by
- NWS Baltimore/Washington
- Area
- Storm-based polygon
Counties Montgomery County, MD, City of Manassas, VA, City of Manassas Park, VA, Fairfax County, VA, Loudoun County, VA, Prince William County, VA
The radar
The Sterling radar (KLWX), 6 km from the middle of the area, began a volume at 00:03 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 |
|---|---|---|---|
| Mar 10, 6:59 PM EST | TORNADO | 1 Wsw Chantilly, VA | EF0 TORNADO WITH ESTIMATED 65 MPH WIND. APPROXIMATELY 15 SOFTWOOD TREES SNAPPED ALONG WITH MANY LARGE BRANCHES BROKEN IN A 4.5 MILE PATH WITH A 75 YARD WIDTH. TORNADO ON THE GROUND FOR APPROXIMATELY 4 MINUTES. |
| Mar 10, 7:00 PM EST | TSTM WND DMG | 1 Nne Centreville, VA | 12-20 TREES DOWN NEAR ELEANOR LAWRENCE PARK AND WALNEY ROAD ON VA-28. TIME ESTIMATED. |
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 |
|---|---|---|---|
| Mar 10, 1:25 PM EST | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 12.0 hours before the alert went out and 10 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
- 1 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 453 m above ground
- 0-6 km bulk shear
- 58 kt
- 0-1 km storm-relative helicity
- 462 m²/s²
- 0-3 km storm-relative helicity
- 658 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
903 WFUS51 KLWX 102358 TORLWX MDC031-VAC059-107-153-683-685-110030- /O.NEW.KLWX.TO.W.0002.110310T2358Z-110311T0030Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 658 PM EST THU MAR 10 2011 THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A * TORNADO WARNING FOR... WEST CENTRAL MONTGOMERY COUNTY IN CENTRAL MARYLAND... NORTHEASTERN CITY OF MANASSAS IN NORTHERN VIRGINIA... CITY OF MANASSAS PARK IN NORTHERN VIRGINIA... EASTERN LOUDOUN COUNTY IN NORTHERN VIRGINIA... NORTH CENTRAL PRINCE WILLIAM COUNTY IN NORTHERN VIRGINIA... NORTHWESTERN FAIRFAX COUNTY IN NORTHERN VIRGINIA... * UNTIL 730 PM EST * AT 654 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR CENTREVILLE...MOVING NORTH AT 45 MPH. * LOCATIONS IMPACTED INCLUDE... DULLES INTERNATIONAL AIRPORT... SOUTH RIDING... ARCOLA... BROADLANDS... HERNDON... BRAMBLETON... ASHBURN... COUNTRYSIDE... LANSDOWNE... LOWES ISLAND... PRECAUTIONARY/PREPAREDNESS ACTIONS... TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING AND AVOID WINDOWS. IF OUTDOORS OR IN A MOBILE HOME OR VEHICLE...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS. THE TORNADO MAY BE WRAPPED IN RAIN AND HARD TO SEE. DO NOT WAIT TO SEE OR HEAR THE TORNADO. TAKE COVER NOW. && LAT...LON 3922 7757 3918 7719 3875 7741 3876 7755 TIME...MOT...LOC 2358Z 184DEG 37KT 3886 7747 $$ LISTEMAA/SMZ
3 follow-up statements
228 WWUS51 KLWX 110008 SVSLWX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 708 PM EST THU MAR 10 2011 VAC153-683-685-110018- /O.CAN.KLWX.TO.W.0002.000000T0000Z-110311T0030Z/ CITY OF MANASSAS VA-CITY OF MANASSAS PARK VA-PRINCE WILLIAM VA- 708 PM EST THU MAR 10 2011 ...THE TORNADO WARNING IS CANCELLED FOR THE CITY OF MANASSAS...THE CITY OF MANASSAS PARK...AND NORTH CENTRAL PRINCE WILLIAM COUNTY... THE THUNDERSTORM THAT PROMPTED THE WARNING HAS EXITED THE WARNED AREA. THUS THE TORNADO WARNING HAS BEEN CANCELLED. LAT...LON 3884 7736 3887 7746 3922 7753 3918 7719 TIME...MOT...LOC 0008Z 184DEG 37KT 3894 7741 $$ MDC031-VAC059-107-110030- /O.CON.KLWX.TO.W.0002.000000T0000Z-110311T0030Z/ MONTGOMERY MD-LOUDOUN VA-FAIRFAX VA- 708 PM EST THU MAR 10 2011 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL 730 PM EST FOR NORTHWESTERN FAIRFAX...EASTERN LOUDOUN AND WEST CENTRAL MONTGOMERY COUNTIES... AT 703 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS TORNADO WAS LOCATED NEAR CHANTILLY...OR NEAR CENTREVILLE...MOVING NORTH AT 45 MPH. LOCATIONS IMPACTED INCLUDE... STERLING... GREAT FALLS... COUNTRYSIDE... LOWES ISLAND... ASHBURN... LANSDOWNE... DAWSONVILLE... DARNESTOWN... NORTH POTOMAC... POOLESVILLE... BEALLSVILLE... BOYDS... GERMANTOWN... TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING AND AVOID WINDOWS. IF OUTDOORS OR IN A MOBILE HOME OR VEHICLE...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS. TORNADOES AT NIGHT ARE DIFFICULT TO SEE AND CONFIRM. TAKE COVER NOW. && LAT...LON 3884 7736 3887 7746 3922 7753 3918 7719 TIME...MOT...LOC 0008Z 184DEG 37KT 3894 7741 $$ LISTEMAA/SMZ
585 WWUS51 KLWX 110018 SVSLWX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 718 PM EST THU MAR 10 2011 MDC031-VAC059-107-110030- /O.CON.KLWX.TO.W.0002.000000T0000Z-110311T0030Z/ MONTGOMERY MD-LOUDOUN VA-FAIRFAX VA- 718 PM EST THU MAR 10 2011 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL 730 PM EST FOR NORTH CENTRAL FAIRFAX...EXTREME EAST CENTRAL LOUDOUN AND CENTRAL MONTGOMERY COUNTIES... AT 717 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS TORNADO WAS LOCATED NEAR LOWES ISLAND...MOVING NORTH AT 45 MPH. LOCATIONS IMPACTED INCLUDE... DARNESTOWN... DAWSONVILLE... GAITHERSBURG... POOLESVILLE... BOYDS... GERMANTOWN... BEALLSVILLE... MONTGOMERY VILLAGE... TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING AND AVOID WINDOWS. IF OUTDOORS OR IN A MOBILE HOME OR VEHICLE...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS. TORNADOES AT NIGHT ARE DIFFICULT TO SEE AND CONFIRM. TAKE COVER NOW. && LAT...LON 3894 7731 3896 7736 3921 7744 3918 7719 TIME...MOT...LOC 0018Z 184DEG 37KT 3906 7732 $$ LISTEMAA/SMZ
464 WWUS51 KLWX 110026 SVSLWX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 726 PM EST THU MAR 10 2011 MDC031-VAC059-107-110036- /O.EXP.KLWX.TO.W.0002.000000T0000Z-110311T0030Z/ MONTGOMERY MD-LOUDOUN VA-FAIRFAX VA- 726 PM EST THU MAR 10 2011 ...THE TORNADO WARNING WILL EXPIRE AT 730 PM EST FOR NORTH CENTRAL FAIRFAX...EXTREME EAST CENTRAL LOUDOUN AND CENTRAL MONTGOMERY COUNTIES... THE THUNDERSTORM THAT PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE LIMITS. THUS THE TORNADO WARNING HAS BEEN ALLOWED TO EXPIRE. LAT...LON 3894 7731 3896 7736 3921 7744 3918 7719 TIME...MOT...LOC 0026Z 184DEG 37KT 3914 7731 $$ LISTEMAA/SMZ
The office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 9, 9:26 PM EST | River Flood Warning | LWX | Spotsylvania, Stafford, City of Fredericksburg | 30 hr |
| Mar 9, 9:26 PM EST | River Flood Warning | LWX | Loudoun | 30 hr |
| Mar 10, 9:46 AM EST | Coastal Flood Warning | LWX | Arlington, Fairfax, King George, Stafford, City of Alexandria, City of Fairfax and 1 more | 17 hr |
| Mar 10, 1:06 PM EST | Gale Warning | LWX | 8 hr | |
| Mar 10, 1:06 PM EST | Small Craft Advisory | LWX | 37 hr | |
| Mar 10, 2:35 PM EST | Flash Flood Warning | LWX | Albemarle, Augusta, Nelson, City of Charlottesville, City of Staunton, City of Waynesboro | 4 hr |
| Mar 10, 2:57 PM EST | Special Weather Statement | LWX | Albemarle, Augusta, Nelson, City of Charlottesville, City of Staunton, City of Waynesboro | 48 min |
| Mar 10, 3:04 PM EST | Areal Flood Warning | LWX | Arlington, Fairfax, Prince William, Stafford, City of Alexandria, City of Fairfax and 1 more | 3 hr |
| Mar 10, 3:25 PM EST | Winter Weather Advisory | LWX | Highland | 24 hr |
| Mar 10, 3:58 PM EST | Special Marine Warning | LWX | 92 min | |
| Mar 10, 4:28 PM EST | Special Weather Statement | LWX | Culpeper, Orange, Spotsylvania, Stafford, City of Fredericksburg | 32 min |
| Mar 10, 4:34 PM EST | Special Weather Statement | LWX | Greene, Madison, Orange, Page, Rappahannock, City of Charlottesville | 26 min |
| Mar 10, 4:36 PM EST | Flash Flood Warning | LWX | Albemarle, Culpeper, Fauquier, Greene, King George, Madison and 5 more | 3 hr |
| Mar 10, 5:02 PM EST | Areal Flood Warning | LWX | Augusta, Culpeper, Greene, Madison, Page, Rappahannock and 2 more | 3 hr |
| Mar 10, 5:02 PM EST | Severe Thunderstorm Warning | LWX | Culpeper, Fauquier, Madison, Page, Rappahannock, Warren | 58 min |
| Mar 10, 5:18 PM EST | Severe Thunderstorm Warning | LWX | Culpeper, Fauquier, Madison, Orange, Spotsylvania, Stafford and 1 more | 57 min |
| Mar 10, 5:24 PM EST | Special Weather Statement | LWX | Clarke, Frederick, City of Winchester | 36 min |
| Mar 10, 5:26 PM EST | Areal Flood Warning | LWX | Clarke, Frederick, Page, Shenandoah, Warren, City of Winchester | 3 hr |
| Mar 10, 5:28 PM EST | Special Marine Warning | LWX | 92 min | |
| Mar 10, 5:34 PM EST | Severe Thunderstorm Warning | LWX | Clarke, Fauquier, Frederick, Loudoun, Warren, City of Winchester | 41 min |
| Mar 10, 5:48 PM EST | Flash Flood Warning | LWX | Arlington, Fairfax, Fauquier, King George, Loudoun, Prince William and 6 more | 4 hr |
| Mar 10, 6:04 PM EST | Special Weather Statement | LWX | Fauquier, Prince William, City of Manassas | 26 min |
| Mar 10, 6:07 PM EST | Flash Flood Warning | LWX | Loudoun | 3 hr |
| Mar 10, 6:10 PM EST | Severe Thunderstorm Warning | LWX | Culpeper, Fairfax, Fauquier, King George, Loudoun, Orange and 7 more | 65 min |
| Mar 10, 6:14 PM EST | Tornado Warning | LWX | Fauquier, Prince William | 31 min |
| Mar 10, 6:20 PM EST | Special Weather Statement | LWX | Loudoun | 25 min |
| Mar 10, 6:38 PM EST | Areal Flood Warning | LWX | Frederick | 3 hr |
| Mar 10, 12:37 PM EST | Areal Flood Warning | LWX | Anne Arundel, Baltimore, Harford, Howard, City of Baltimore | 6 hr |
| Mar 10, 2:46 PM EST | River Flood Warning | LWX | Montgomery | 13 hr |
| Mar 10, 4:06 PM EST | Areal Flood Warning | LWX | Anne Arundel, Montgomery, Prince George's | 4 hr |
| Mar 10, 6:06 PM EST | Special Weather Statement | LWX | Washington | 24 min |
| Mar 10, 6:29 PM EST | Flash Flood Warning | LWX | Anne Arundel, Baltimore, Carroll, Frederick, Harford, Howard and 2 more | 4 hr |
Nearby
Tornado Warnings in Virginia, 2011Tornado Warnings in Maryland, 2011Every tornado warning in 2011Tornadoes in 2011
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.