Alert archive / Virginia / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 416, NWS Baltimore/Washington
NWS Baltimore/Washington issued this severe thunderstorm warning at Sep 3, 2011, 3:17 PM EDT for Rockingham County, Virginia; Pendleton County, West Virginia. It was in force for 24 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Sep 3, 2011, 3:17 PM EDT (19:17 UTC)
- Expired
- Sep 3, 2011, 3:41 PM EDT
- In force
- 24 min
- Issued by
- NWS Baltimore/Washington
- Area
- Storm-based polygon
Counties Rockingham County, VA, Pendleton County, WV
The radar
The Sterling radar (KLWX), 147 km from the middle of the area, began a volume at 19:18 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.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 7.3 hours before the alert went out and 154 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
- 115 J/kg
- Mixed-layer CIN
- -316 J/kg
- Mixed-layer LCL
- 585 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 100 m²/s²
- 0-3 km storm-relative helicity
- 197 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 6.6
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Baltimore/Washington wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 3, 3:16 PM EDT, 1 minute earlier.
Area forecast discussion, Sep 3, 3:16 PM EDT, 1 minute before
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</html>Hazardous weather outlook, Sep 3, 2:11 PM EDT, 1 hour 6 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 211 PM EDT SAT SEP 3 2011 ANZ530>543-DCZ001-MDZ006-007-011-013-014-016>018-VAZ052>057- 041000- CHESAPEAKE BAY NORTH OF POOLES ISLAND MD- CHESAPEAKE BAY FROM POOLES ISLAND TO SANDY POINT MD- CHESAPEAKE BAY FROM SANDY POINT TO NORTH BEACH MD- CHESAPEAKE BAY FROM NORTH BEACH TO DRUM POINT MD- CHESAPEAKE BAY FROM DRUM POINT MD TO SMITH POINT VA- TIDAL POTOMAC FROM KEY BRIDGE TO INDIAN HEAD MD- TIDAL POTOMAC FROM INDIAN HEAD TO COBB ISLAND MD- TIDAL POTOMAC FROM COBB ISLAND MD TO SMITH POINT VA- PATAPSCO RIVER INCLUDING BALTIMORE HARBOR- CHESTER RIVER TO QUEENSTOWN MD-EASTERN BAY- CHOPTANK RIVER TO CAMBRIDGE MD AND THE LITTLE CHOPTANK RIVER- PATUXENT RIVER TO BROOMES ISLAND MD- TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND-DISTRICT OF COLUMBIA-NORTHERN BALTIMORE-HARFORD- SOUTHERN BALTIMORE-PRINCE GEORGES-ANNE ARUNDEL-CHARLES-ST. MARYS- CALVERT-PRINCE WILLIAM/MANASSAS/MANASSAS PARK-FAIRFAX- ARLINGTON/FALLS CHURCH/ALEXANDRIA-STAFFORD-SPOTSYLVANIA- KING GEORGE- 211 PM EDT SAT SEP 3 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE MARYLAND PORTION OF THE CHESAPEAKE BAY...TIDAL POTOMAC RIVER...AND ADJACENT COUNTIES IN CENTRAL MARYLAND AND NORTHERN VIRGINIA AS WELL AS THE DISTRICT OF COLUMBIA. .DAY ONE...THIS AFTERNOON AND TONIGHT A SMALL CRAFT ADVISORY IS IN EFFECT TONIGHT FOR THE MARYLAND PORTION OF THE CHESAPEAKE BAY AS WELL AS THE LOWER TIDAL POTOMAC RIVER OVERNIGHT. MINOR COASTAL FLOODING IS ANTICIPATED AROUND HIGH TIDE THIS EVENING INTO THE OVERNIGHT ALONG THE UPPER PORTIONS OF THE TIDAL POTOMAC RIVER AND WESTERN SHORES OF THE MARYLAND CHESAPEAKE BAY. A COASTAL FLOOD ADVISORY HAS BEEN ISSUED. SEE WBCCFWLWX FOR FURTHER DETAILS. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY A SMALL CRAFT ADVISORY HAS BEEN ISSUED FOR THE MARYLAND CHESAPEAKE BAY AND LOWER TIDAL POTOMAC SUNDAY NIGHT. SMALL CRAFT CONDITIONS MAY CONTINUE INTO MONDAY. SHOWERS AND THUNDERSTORMS MAY PRODUCE VERY HEAVY RAINFALL MONDAY AND TUESDAY AS TROPICAL MOISTURE INTERACTS WITH A SLOW-MOVING COLD FRONT. FLASH FLOODING MAY RESULT. HEAVY PRECIPITATION AND POTENTIAL FLOODING COULD LAST WELL INTO NEXT WEEK. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED AT THIS TIME. MDZ003>005-009-010-501-502-VAZ025>031-036>040-042-050-051-501>504- WVZ050>053-055-501>506-041000- WASHINGTON-FREDERICK MD-CARROLL-MONTGOMERY-HOWARD- EXTREME WESTERN ALLEGANY-CENTRAL AND EASTERN ALLEGANY-AUGUSTA- ROCKINGHAM-SHENANDOAH-FREDERICK VA-PAGE-WARREN-CLARKE-NELSON- ALBEMARLE-GREENE-MADISON-RAPPAHANNOCK-LOUDOUN-ORANGE-CULPEPER- NORTHERN FAUQUIER-SOUTHERN FAUQUIER-WESTERN HIGHLAND- EASTERN HIGHLAND-HAMPSHIRE-MORGAN-BERKELEY-JEFFERSON-HARDY- WESTERN GRANT-EASTERN GRANT-WESTERN MINERAL-EASTERN MINERAL- WESTERN PENDLETON-EASTERN PENDLETON- 211 PM EDT SAT SEP 3 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN WEST VIRGINIA... NORTHERN AND CENTRAL VIRGINIA...AND CENTRAL AND WESTERN MARYLAND WITH THE EXCEPTION OF GARRETT COUNTY. .DAY ONE...THIS AFTERNOON AND TONIGHT SHOWERS AND THUNDERSTORMS WILL CONTINUE ACROSS THE SOUTHERN POTOMAC HIGHLANDS AND CENTRAL SHENANDOAH VALLEY THIS AFTERNOON INTO THE EARLY EVENING HOURS. THUNDERSTORMS WILL HAVE THE POTENTIAL TO PRODUCE LOCALLY HEAVY RAINFALL AND PROLIFIC LIGHTNING. ISOLATED THUNDERSTORMS MAY BECOME SEVERE PRODUCING LARGE HAIL. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY SHOWERS AND THUNDERSTORMS MAY PRODUCE VERY HEAVY RAINFALL MONDAY AND TUESDAY AS TROPICAL MOISTURE INTERACTS WITH A SLOW-MOVING COLD FRONT. FLASH FLOODING MAY RESULT. HEAVY PRECIPITATION AND POTENTIAL FLOODING COULD LAST WELL INTO NEXT WEEK. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED AT THIS TIME.
In the hours before
Special weather statement, Sep 3, 1:32 PM EDT, 1 hour 45 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 132 PM EDT SAT SEP 3 2011 VAZ025-036-037-031800- NELSON VA-ALBEMARLE VA-AUGUSTA VA- 132 PM EDT SAT SEP 3 2011 ...STRONG THUNDERSTORM TO AFFECT NELSON...ALBEMARLE AND AUGUSTA COUNTIES... AT 132 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 5 MILES NORTH OF AFTON...MOVING SOUTHWEST AT 15 MPH. LOCATIONS IMPACTED INCLUDE AFTON...LYNDHURST AND SHERANDO. THIS STORM IS PRODUCING FREQUENT CLOUD TO GROUND LIGHTNING. MOVE INDOORS IMMEDIATELY FOR YOUR SAFETY. IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. HEAVY RAIN WITH THIS STORM WILL REDUCE VISIBILITIES TO BELOW ONE MILE AND MAY CAUSE PONDING OF WATER ON ROADWAYS. SMALL HAIL CAN BE EXPECTED WITH THIS STORM. && LAT...LON 3783 7893 3797 7916 3814 7890 3809 7880 TIME...MOT...LOC 1732Z 036DEG 14KT 3808 7888 HTS
Special weather statement, Sep 3, 1:43 PM EDT, 1 hour 34 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 143 PM EDT SAT SEP 3 2011 WVZ505-506-031815- EASTERN PENDLETON WV-WESTERN PENDLETON WV- 143 PM EDT SAT SEP 3 2011 ...STRONG THUNDERSTORM TO AFFECT PENDLETON COUNTY... AT 143 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 3 MILES SOUTHWEST OF SENECA ROCKS...MOVING SOUTH AT 15 MPH. LOCATIONS IMPACTED INCLUDE RIVERTON AND CIRCLEVILLE. THIS STORM IS PRODUCING FREQUENT CLOUD TO GROUND LIGHTNING. MOVE INDOORS IMMEDIATELY FOR YOUR SAFETY. IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. HEAVY RAIN WITH THIS STORM WILL REDUCE VISIBILITIES TO BELOW ONE MILE AND MAY CAUSE PONDING OF WATER ON ROADWAYS. SMALL HAIL CAN BE EXPECTED WITH THIS STORM. && LAT...LON 3865 7931 3866 7952 3884 7947 3884 7937 TIME...MOT...LOC 1743Z 359DEG 12KT 3879 7941 HTS
Special weather statement, Sep 3, 2:04 PM EDT, 1 hour 13 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
204 PM EDT SAT SEP 3 2011
VAZ025-031900-
AUGUSTA VA-
204 PM EDT SAT SEP 3 2011
...STRONG THUNDERSTORM TO AFFECT AUGUSTA COUNTY...
AT 204 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 3 MILES
EAST OF MINT SPRING...MOVING WEST AT 25 MPH.
LOCATIONS IMPACTED INCLUDE MINT SPRING...GREENVILLE...MIDDLEBROOK AND
SPOTTSWOOD.
THIS STORM IS PRODUCING FREQUENT CLOUD TO GROUND LIGHTNING. MOVE
INDOORS IMMEDIATELY FOR YOUR SAFETY. IF YOU CAN HEAR THUNDER...YOU
ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.
HEAVY RAIN WITH THIS STORM WILL REDUCE VISIBILITIES TO BELOW ONE MILE
AND MAY CAUSE PONDING OF WATER ON ROADWAYS.
SMALL HAIL CAN BE EXPECTED WITH THIS STORM.
&&
LAT...LON 3810 7902 3804 7900 3793 7922 3802 7938
3803 7938
TIME...MOT...LOC 1804Z 069DEG 20KT 3806 7907
HTSSpecial weather statement, Sep 3, 2:19 PM EDT, 58 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
219 PM EDT SAT SEP 3 2011
VAZ025-036-031915-
NELSON VA-AUGUSTA VA-
219 PM EDT SAT SEP 3 2011
...STRONG THUNDERSTORM TO AFFECT NELSON AND AUGUSTA COUNTIES...
AT 216 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 4 MILES
NORTHEAST OF MONTEBELLO...MOVING NORTHWEST AT 10 MPH.
THIS STORM WILL CROSS THE BLUE RIDGE PARKWAY.
THIS STORM IS PRODUCING FREQUENT CLOUD TO GROUND LIGHTNING. MOVE
INDOORS IMMEDIATELY FOR YOUR SAFETY. IF YOU CAN HEAR THUNDER...YOU
ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.
HEAVY RAIN WITH THIS STORM WILL REDUCE VISIBILITIES TO BELOW ONE MILE
AND MAY CAUSE PONDING OF WATER ON ROADWAYS.
SMALL HAIL CAN BE EXPECTED WITH THIS STORM.
&&
LAT...LON 3781 7917 3784 7916 3786 7915 3789 7915
3793 7921 3797 7914 3792 7893 3777 7906
TIME...MOT...LOC 1816Z 124DEG 8KT 3790 7909
HTSSpecial weather statement, Sep 3, 2:24 PM EDT, 53 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
224 PM EDT SAT SEP 3 2011
VAZ503-504-031930-
EASTERN HIGHLAND VA-WESTERN HIGHLAND VA-
224 PM EDT SAT SEP 3 2011
...STRONG THUNDERSTORM TO HIGHLAND COUNTY...
AT 224 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER
MCDOWELL...MOVING SOUTHWEST AT 10 MPH.
LOCATIONS IMPACTED INCLUDE CLOVER CREEK...VANDERPOOL...MUSTOE...MILL
GAP AND BOLAR.
THIS STORM IS PRODUCING FREQUENT CLOUD TO GROUND LIGHTNING. MOVE
INDOORS IMMEDIATELY FOR YOUR SAFETY. IF YOU CAN HEAR THUNDER...YOU
ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.
HEAVY RAIN WITH THIS STORM WILL REDUCE VISIBILITIES TO BELOW ONE MILE
AND MAY CAUSE PONDING OF WATER ON ROADWAYS.
SMALL HAIL CAN BE EXPECTED WITH THIS STORM.
&&
LAT...LON 3842 7951 3831 7946 3820 7960 3821 7970
3824 7975 3833 7977
TIME...MOT...LOC 1824Z 062DEG 7KT 3833 7953
HTSSpecial weather statement, Sep 3, 2:27 PM EDT, 50 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
227 PM EDT SAT SEP 3 2011
WVZ505-506-031930-
EASTERN PENDLETON WV-WESTERN PENDLETON WV-
227 PM EDT SAT SEP 3 2011
...STRONG THUNDERSTORM TO AFFECT PENDLETON COUNTY...
AT 226 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER
CIRCLEVILLE...MOVING WEST AT 15 MPH.
LOCATIONS IMPACTED INCLUDE CHERRY GROVE.
THIS STORM IS PRODUCING FREQUENT CLOUD TO GROUND LIGHTNING. MOVE
INDOORS IMMEDIATELY FOR YOUR SAFETY. IF YOU CAN HEAR THUNDER...YOU
ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.
HEAVY RAIN WITH THIS STORM WILL REDUCE VISIBILITIES TO BELOW ONE MILE
AND MAY CAUSE PONDING OF WATER ON ROADWAYS.
SMALL HAIL CAN BE EXPECTED WITH THIS STORM.
&&
LAT...LON 3865 7963 3867 7963 3868 7961 3869 7961
3874 7955 3875 7940 3857 7941 3859 7964
3860 7964 3863 7964
TIME...MOT...LOC 1826Z 083DEG 15KT 3865 7950
HTSThe office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 3, 9:44 AM EDT | Severe Thunderstorm Warning | LWX | Fairfax, Loudoun | 46 min |
| Sep 3, 9:51 AM EDT | Special Weather Statement | LWX | Loudoun | 24 min |
| Sep 3, 10:25 AM EDT | Special Weather Statement | LWX | Fauquier | 35 min |
| Sep 3, 11:06 AM EDT | Special Weather Statement | LWX | Culpeper, Fauquier | 24 min |
| Sep 3, 11:41 AM EDT | Special Weather Statement | LWX | Culpeper, Orange, Spotsylvania | 34 min |
| Sep 3, 1:32 PM EDT | Special Weather Statement | LWX | City of Waynesboro | 28 min |
| Sep 3, 1:49 PM EDT | Coastal Flood Advisory | LWX | Arlington, Fairfax, King George, Stafford, City of Alexandria, City of Fairfax and 1 more | 14 hr |
| Sep 3, 2:04 PM EDT | Special Weather Statement | LWX | Augusta | 56 min |
| Sep 3, 2:19 PM EDT | Special Weather Statement | LWX | Nelson | 56 min |
| Sep 3, 2:24 PM EDT | Special Weather Statement | LWX | Highland | 66 min |
| Sep 3, 2:33 PM EDT | Severe Thunderstorm Warning | LWX | Highland | 24 min |
| Sep 3, 4:59 PM EDT | Small Craft Advisory | LWX | 3 days | |
| Sep 3, 8:43 AM EDT | Special Weather Statement | LWX | Carroll | 32 min |
| Sep 3, 9:21 AM EDT | Special Weather Statement | LWX | Carroll, Frederick, Howard, Montgomery | 24 min |
| Sep 3, 10:29 AM EDT | Special Weather Statement | LWX | Montgomery | 31 min |
| Sep 3, 10:45 AM EDT | Special Weather Statement | LWX | City of Baltimore | 30 min |
| Sep 3, 1:43 PM EDT | Special Weather Statement | LWX | Pendleton | 32 min |
| Sep 3, 2:27 PM EDT | Special Weather Statement | LWX | Pendleton | 63 min |
| Sep 3, 2:45 PM EDT | Severe Thunderstorm Warning | LWX | Pendleton | 45 min |
Nearby
Severe Thunderstorm Warnings in Virginia, 2011Severe Thunderstorm Warnings in West Virginia, 2011Every severe thunderstorm warning 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.