Alert archive / Maryland / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 216, NWS Baltimore/Washington

June 12, 2011Frederick County, Washington County, Maryland

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.

IssuedProductOfficeLasted
Jun 12, 1:48 PM EDTSevere Thunderstorm WatchSPC6 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.

Skew-T log-pSkew-T log-p diagram, Washington/Dulle, VA at 12:00Z on 2011-06-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 360 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 12:00Z on 2011-06-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -27 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
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

Open this sounding in Storm Lab

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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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

TCH
Special weather statement, Jun 12, 1:41 PM EDT, 1 hour 15 minutes before
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Special weather statement, Jun 12, 1:46 PM EDT, 1 hour 10 minutes before
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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

JRK
Special 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

JRK

The office that day

Everything else NWS Baltimore/Washington issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 11, 9:09 PM EDTSpecial Weather StatementLWXNelson36 min
Jun 11, 9:27 PM EDTSpecial Weather StatementLWXMadison33 min
Jun 11, 9:52 PM EDTSpecial Weather StatementLWXAlbemarle, City of Charlottesville38 min
Jun 12, 1:18 PM EDTSpecial Marine WarningLWX39 min
Jun 12, 1:25 PM EDTSpecial Weather StatementLWXCity of Harrisonburg35 min
Jun 12, 1:41 PM EDTSpecial Weather StatementLWXAugusta, Nelson, City of Staunton, City of Waynesboro34 min
Jun 12, 2:09 PM EDTSpecial Weather StatementLWXAlbemarle, City of Charlottesville, City of Waynesboro36 min
Jun 12, 2:10 PM EDTSevere Thunderstorm WarningLWXFrederick50 min
Jun 12, 2:42 PM EDTSevere Thunderstorm WarningLWXAlbemarle, Nelson, City of Charlottesville48 min
Jun 12, 2:48 PM EDTSpecial Marine WarningLWX87 min
Jun 12, 2:52 PM EDTSpecial Weather StatementLWXNelson23 min
Jun 12, 3:05 PM EDTSpecial Weather StatementLWXShenandoah25 min
Jun 12, 3:16 PM EDTSevere Thunderstorm WarningLWXLoudoun44 min
Jun 12, 3:24 PM EDTSpecial Weather StatementLWXClarke, City of Winchester36 min
Jun 12, 3:32 PM EDTSevere Thunderstorm WarningLWXClarke, Loudoun43 min
Jun 12, 3:34 PM EDTSpecial Marine WarningLWX41 min
Jun 12, 3:38 PM EDTSpecial Weather StatementLWXPage, Shenandoah37 min
Jun 12, 3:50 PM EDTSpecial Marine WarningLWX85 min
Jun 12, 4:03 PM EDTSevere Thunderstorm WarningLWXFairfax, Fauquier, Loudoun, Prince William, City of Fairfax, City of Manassas and 1 more42 min
Jun 12, 4:05 PM EDTSpecial Weather StatementLWXLoudoun25 min
Jun 12, 4:19 PM EDTSpecial Marine WarningLWX116 min
Jun 12, 4:25 PM EDTSpecial Marine WarningLWX2 hr
Jun 12, 4:34 PM EDTSpecial Weather StatementLWXWarren26 min
Jun 12, 4:36 PM EDTSpecial Weather StatementLWXMadison24 min
Jun 12, 4:45 PM EDTSpecial Weather StatementLWXFairfax, Fauquier, Prince William, City of Fairfax, City of Manassas, City of Manassas Park30 min
Jun 12, 5:00 PM EDTSevere Thunderstorm WarningLWXFairfax, Prince William, City of Alexandria, City of Fairfax, City of Manassas, City of Manassas Park45 min
Jun 12, 5:12 PM EDTSpecial Marine WarningLWX43 min
Jun 12, 5:35 PM EDTSpecial Marine WarningLWX85 min
Jun 12, 5:48 PM EDTSpecial Weather StatementLWXStafford27 min
Jun 12, 5:59 PM EDTSpecial Weather StatementLWXKing George31 min
Jun 12, 6:04 PM EDTSpecial Marine WarningLWX79 min
Jun 12, 6:10 PM EDTSpecial Marine WarningLWX72 min
Jun 12, 6:11 PM EDTSpecial Weather StatementLWXKing George, Stafford, City of Fredericksburg34 min
Jun 12, 6:12 PM EDTSpecial Weather StatementLWXFauquier33 min
Jun 12, 6:14 PM EDTSpecial Weather StatementLWXNelson31 min
Jun 12, 6:30 PM EDTSevere Thunderstorm WarningLWXKing George45 min
Jun 12, 6:36 PM EDTSpecial Marine WarningLWX54 min
Jun 11, 8:00 PM EDTSpecial Weather StatementLWXCarroll30 min
Jun 11, 8:18 PM EDTSevere Thunderstorm WarningLWXBaltimore, Carroll42 min
Jun 11, 8:54 PM EDTSevere Thunderstorm WarningLWXBaltimore, Harford51 min
Jun 11, 9:05 PM EDTSpecial Weather StatementLWXCarroll25 min
Jun 11, 9:45 PM EDTSpecial Weather StatementLWXHarford30 min
Jun 11, 10:13 PM EDTSpecial Weather StatementLWXHarford47 min
Jun 11, 10:55 PM EDTSpecial Weather StatementLWXHarford35 min
Jun 12, 1:09 PM EDTSpecial Weather StatementLWXAnne Arundel36 min
Jun 12, 1:46 PM EDTSpecial Weather StatementLWXAllegany, Washington29 min
Jun 12, 3:07 PM EDTSpecial Weather StatementLWXCalvert23 min
Jun 12, 3:12 PM EDTSevere Thunderstorm WarningLWXCalvert, Saint Mary's48 min
Jun 12, 3:45 PM EDTSevere Thunderstorm WarningLWXHarford45 min
Jun 12, 3:52 PM EDTTornado WarningLWXHarford23 min
Jun 12, 4:13 PM EDTTornado WarningLWXHarford47 min
Jun 12, 4:16 PM EDTSpecial Weather StatementLWXBaltimore29 min
Jun 12, 4:26 PM EDTSevere Thunderstorm WarningLWXBaltimore, Harford49 min
Jun 12, 4:41 PM EDTTornado WarningLWXHarford35 min
Jun 12, 4:51 PM EDTSevere Thunderstorm WarningLWXBaltimore, Harford, City of Baltimore39 min
Jun 12, 4:56 PM EDTSpecial Weather StatementLWXPrince George's34 min
Jun 12, 5:24 PM EDTSpecial Weather StatementLWXAnne Arundel36 min
Jun 12, 5:28 PM EDTSpecial Weather StatementLWXCity of Baltimore32 min
Jun 12, 5:32 PM EDTSpecial Weather StatementLWXAnne Arundel28 min
Jun 12, 5:40 PM EDTSevere Thunderstorm WarningLWXCharles, Prince George's37 min
Jun 12, 6:55 PM EDTSpecial Weather StatementLWXAnne Arundel35 min
Jun 12, 3:00 PM EDTSpecial Weather StatementLWXBerkeley, Jefferson30 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.