Alert archive / Maryland / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 216, NWS Baltimore/Washington
NWS Baltimore/Washington issued this severe thunderstorm warning at Jun 12, 2011, 2:56 PM EDT for Frederick County, Washington County, Maryland. It was in force for 34 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
- Jun 12, 2011, 2:56 PM EDT (18:56 UTC)
- Expired
- Jun 12, 2011, 3:30 PM EDT
- In force
- 34 min
- Issued by
- NWS Baltimore/Washington
- Area
- Storm-based polygon
Counties Frederick County, MD, Washington County, MD
The radar
The Sterling radar (KLWX), 63 km from the middle of the area, began a volume at 18:57 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jun 12, 1:48 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 6.9 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
- 360 J/kg
- Mixed-layer CIN
- -50 J/kg
- Mixed-layer LCL
- 861 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- -27 m²/s²
- 0-3 km storm-relative helicity
- 2 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Jun 12, 10:22 AM EDT, 4 hours 34 minutes earlier.
Area forecast discussion, Jun 12, 10:22 AM EDT, 4 hours 34 minutes before
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</html>Hazardous weather outlook, Jun 12, 2:33 PM EDT, 23 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 233 PM EDT SUN JUN 12 2011 ANZ530>543-DCZ001-MDZ006-007-011-013-014-016>018-VAZ052>057- 131445- 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- 233 PM EDT SUN JUN 12 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 SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 8:00 PM. SOME THUNDERSTORMS HAVE THE POTENTIAL TO PRODUCE LARGE HAIL AND DAMAGING WIND GUSTS. A SMALL CRAFT ADVISORY IS IN EFFECT LATE TONIGHT FOR THE MARYLAND PORTION OF THE CHESAPEAKE BAY SOUTH OF POOLES ISLAND AND THE LOWER TIDAL POTOMAC RIVER FROM COBB ISLAND TO SMITH POINT. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY A SMALL CRAFT ADVISORY IS IN EFFECT UNTIL NOON MONDAY FOR THE MARYLAND PORTION OF THE CHESAPEAKE BAY SOUTH OF POOLES ISLAND AND THE LOWER TIDAL POTOMAC RIVER FROM COBB ISLAND TO SMITH POINT. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON AND EVENING. MDZ003>005-009-010-501-502-VAZ025>031-036>040-042-050-051-501>504- WVZ050>053-055-501>506-131445- 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- 233 PM EDT SUN JUN 12 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 A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 8:00 PM. SOME THUNDERSTORMS HAVE THE POTENTIAL TO PRODUCE LARGE HAIL AND DAMAGING WIND GUSTS. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON AND EVENING.
In the hours before
Special weather statement, Jun 12, 1:25 PM EDT, 1 hour 31 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 125 PM EDT SUN JUN 12 2011 VAZ025-026-029-037>039-121800- GREENE VA-MADISON VA-PAGE VA-ALBEMARLE VA-AUGUSTA VA-ROCKINGHAM VA- 125 PM EDT SUN JUN 12 2011 ...STRONG THUNDERSTORMS TO AFFECT GREENE...MADISON...PAGE... ALBEMARLE...AUGUSTA AND ROCKINGHAM COUNTIES... AT 125 PM EDT...DOPPLER RADAR INDICATED STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 3 MILES SOUTHEAST OF LINVILLE TO 2 MILES NORTHWEST OF FORT DEFIANCE...MOVING SOUTHEAST AT 25 MPH. LOCATIONS IMPACTED INCLUDE MASSANUTTEN...GROTTOES...SHENANDOAH... CRIMORA AND CROZET. SMALL HAIL CAN BE EXPECTED WITH THESE STORMS. && LAT...LON 3842 7836 3804 7871 3822 7915 3860 7880 TIME...MOT...LOC 1725Z 297DEG 22KT 3848 7876 3825 7898
Local storm report, Jun 12, 1:38 PM EDT, 1 hour 18 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
138 PM EDT SUN JUN 12 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0454 PM HAIL TYRO 37.82N 79.00W
06/11/2011 E0.88 INCH NELSON VA PUBLIC
&&
EVENT NUMBER LWX1100943
TCHSpecial weather statement, Jun 12, 1:41 PM EDT, 1 hour 15 minutes before
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</html>Special weather statement, Jun 12, 1:46 PM EDT, 1 hour 10 minutes before
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</html>Special weather statement, Jun 12, 2:09 PM EDT, 47 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
209 PM EDT SUN JUN 12 2011
VAZ025-026-036>038-121845-
NELSON VA-GREENE VA-ALBEMARLE VA-AUGUSTA VA-ROCKINGHAM VA-
209 PM EDT SUN JUN 12 2011
...STRONG THUNDERSTORMS TO AFFECT NELSON...GREENE...ALBEMARLE...
AUGUSTA AND ROCKINGHAM COUNTIES...
AT 209 PM EDT...DOPPLER RADAR INDICATED STRONG THUNDERSTORMS ALONG A
LINE EXTENDING FROM 4 MILES EAST OF ROCKY BAR TO 2 MILES NORTH OF
LYNDHURST...MOVING SOUTHEAST AT 20 MPH.
LOCATIONS IMPACTED INCLUDE WAYNESBORO...SHERANDO...AFTON...CROZET
AND FREE UNION.
WIND GUSTS OF 40 TO 50 MPH AND SMALL HAIL CAN BE EXPECTED WITH THESE
STORMS.
&&
LAT...LON 3808 7906 3841 7869 3823 7836 3821 7834
3819 7837 3817 7832 3811 7829 3777 7873
TIME...MOT...LOC 1809Z 315DEG 17KT 3834 7862 3805 7893
JRKSpecial weather statement, Jun 12, 2:52 PM EDT, 4 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
252 PM EDT SUN JUN 12 2011
VAZ025-036-121915-
NELSON VA-AUGUSTA VA-
252 PM EDT SUN JUN 12 2011
...STRONG THUNDERSTORM TO AFFECT NELSON AND AUGUSTA COUNTIES...
AT 252 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER
TYRO...MOVING SOUTHEAST AT 20 MPH.
LOCATIONS IMPACTED INCLUDE SHIPMAN.
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 MAY REDUCE VISIBILITIES TO BELOW ONE MILE
AND MAY CAUSE PONDING OF WATER ON ROADWAYS.
WIND GUSTS OF 30 TO 40 MPH AND SMALL HAIL CAN BE EXPECTED WITH THIS
STORM.
&&
LAT...LON 3756 7892 3769 7899 3772 7907 3777 7908
3779 7917 3787 7915 3793 7891 3786 7880
3780 7879 3771 7865 3769 7865 3769 7869
3763 7873 3764 7882 3754 7883 3753 7886
TIME...MOT...LOC 1852Z 310DEG 17KT 3779 7897
JRKThe office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 11, 9:09 PM EDT | Special Weather Statement | LWX | Nelson | 36 min |
| Jun 11, 9:27 PM EDT | Special Weather Statement | LWX | Madison | 33 min |
| Jun 11, 9:52 PM EDT | Special Weather Statement | LWX | Albemarle, City of Charlottesville | 38 min |
| Jun 12, 1:18 PM EDT | Special Marine Warning | LWX | 39 min | |
| Jun 12, 1:25 PM EDT | Special Weather Statement | LWX | City of Harrisonburg | 35 min |
| Jun 12, 1:41 PM EDT | Special Weather Statement | LWX | Augusta, Nelson, City of Staunton, City of Waynesboro | 34 min |
| Jun 12, 2:09 PM EDT | Special Weather Statement | LWX | Albemarle, City of Charlottesville, City of Waynesboro | 36 min |
| Jun 12, 2:10 PM EDT | Severe Thunderstorm Warning | LWX | Frederick | 50 min |
| Jun 12, 2:42 PM EDT | Severe Thunderstorm Warning | LWX | Albemarle, Nelson, City of Charlottesville | 48 min |
| Jun 12, 2:48 PM EDT | Special Marine Warning | LWX | 87 min | |
| Jun 12, 2:52 PM EDT | Special Weather Statement | LWX | Nelson | 23 min |
| Jun 12, 3:05 PM EDT | Special Weather Statement | LWX | Shenandoah | 25 min |
| Jun 12, 3:16 PM EDT | Severe Thunderstorm Warning | LWX | Loudoun | 44 min |
| Jun 12, 3:24 PM EDT | Special Weather Statement | LWX | Clarke, City of Winchester | 36 min |
| Jun 12, 3:32 PM EDT | Severe Thunderstorm Warning | LWX | Clarke, Loudoun | 43 min |
| Jun 12, 3:34 PM EDT | Special Marine Warning | LWX | 41 min | |
| Jun 12, 3:38 PM EDT | Special Weather Statement | LWX | Page, Shenandoah | 37 min |
| Jun 12, 3:50 PM EDT | Special Marine Warning | LWX | 85 min | |
| Jun 12, 4:03 PM EDT | Severe Thunderstorm Warning | LWX | Fairfax, Fauquier, Loudoun, Prince William, City of Fairfax, City of Manassas and 1 more | 42 min |
| Jun 12, 4:05 PM EDT | Special Weather Statement | LWX | Loudoun | 25 min |
| Jun 12, 4:19 PM EDT | Special Marine Warning | LWX | 116 min | |
| Jun 12, 4:25 PM EDT | Special Marine Warning | LWX | 2 hr | |
| Jun 12, 4:34 PM EDT | Special Weather Statement | LWX | Warren | 26 min |
| Jun 12, 4:36 PM EDT | Special Weather Statement | LWX | Madison | 24 min |
| Jun 12, 4:45 PM EDT | Special Weather Statement | LWX | Fairfax, Fauquier, Prince William, City of Fairfax, City of Manassas, City of Manassas Park | 30 min |
| Jun 12, 5:00 PM EDT | Severe Thunderstorm Warning | LWX | Fairfax, Prince William, City of Alexandria, City of Fairfax, City of Manassas, City of Manassas Park | 45 min |
| Jun 12, 5:12 PM EDT | Special Marine Warning | LWX | 43 min | |
| Jun 12, 5:35 PM EDT | Special Marine Warning | LWX | 85 min | |
| Jun 12, 5:48 PM EDT | Special Weather Statement | LWX | Stafford | 27 min |
| Jun 12, 5:59 PM EDT | Special Weather Statement | LWX | King George | 31 min |
| Jun 12, 6:04 PM EDT | Special Marine Warning | LWX | 79 min | |
| Jun 12, 6:10 PM EDT | Special Marine Warning | LWX | 72 min | |
| Jun 12, 6:11 PM EDT | Special Weather Statement | LWX | King George, Stafford, City of Fredericksburg | 34 min |
| Jun 12, 6:12 PM EDT | Special Weather Statement | LWX | Fauquier | 33 min |
| Jun 12, 6:14 PM EDT | Special Weather Statement | LWX | Nelson | 31 min |
| Jun 12, 6:30 PM EDT | Severe Thunderstorm Warning | LWX | King George | 45 min |
| Jun 12, 6:36 PM EDT | Special Marine Warning | LWX | 54 min | |
| Jun 11, 8:00 PM EDT | Special Weather Statement | LWX | Carroll | 30 min |
| Jun 11, 8:18 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll | 42 min |
| Jun 11, 8:54 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 51 min |
| Jun 11, 9:05 PM EDT | Special Weather Statement | LWX | Carroll | 25 min |
| Jun 11, 9:45 PM EDT | Special Weather Statement | LWX | Harford | 30 min |
| Jun 11, 10:13 PM EDT | Special Weather Statement | LWX | Harford | 47 min |
| Jun 11, 10:55 PM EDT | Special Weather Statement | LWX | Harford | 35 min |
| Jun 12, 1:09 PM EDT | Special Weather Statement | LWX | Anne Arundel | 36 min |
| Jun 12, 1:46 PM EDT | Special Weather Statement | LWX | Allegany, Washington | 29 min |
| Jun 12, 3:07 PM EDT | Special Weather Statement | LWX | Calvert | 23 min |
| Jun 12, 3:12 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Saint Mary's | 48 min |
| Jun 12, 3:45 PM EDT | Severe Thunderstorm Warning | LWX | Harford | 45 min |
| Jun 12, 3:52 PM EDT | Tornado Warning | LWX | Harford | 23 min |
| Jun 12, 4:13 PM EDT | Tornado Warning | LWX | Harford | 47 min |
| Jun 12, 4:16 PM EDT | Special Weather Statement | LWX | Baltimore | 29 min |
| Jun 12, 4:26 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 49 min |
| Jun 12, 4:41 PM EDT | Tornado Warning | LWX | Harford | 35 min |
| Jun 12, 4:51 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford, City of Baltimore | 39 min |
| Jun 12, 4:56 PM EDT | Special Weather Statement | LWX | Prince George's | 34 min |
| Jun 12, 5:24 PM EDT | Special Weather Statement | LWX | Anne Arundel | 36 min |
| Jun 12, 5:28 PM EDT | Special Weather Statement | LWX | City of Baltimore | 32 min |
| Jun 12, 5:32 PM EDT | Special Weather Statement | LWX | Anne Arundel | 28 min |
| Jun 12, 5:40 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's | 37 min |
| Jun 12, 6:55 PM EDT | Special Weather Statement | LWX | Anne Arundel | 35 min |
| Jun 12, 3:00 PM EDT | Special Weather Statement | LWX | Berkeley, Jefferson | 30 min |
Nearby
Severe Thunderstorm Warnings in Maryland, 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.