Alert archive / Maryland / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 9, NWS Baltimore/Washington

February 11, 20094 counties in Virginia; 8 counties in Maryland

NWS Baltimore/Washington issued this severe thunderstorm warning at Feb 11, 2009, 10:07 PM EST for 4 counties in Virginia; 8 counties in Maryland. It was in force for 49 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
Feb 11, 2009, 10:07 PM EST (03:07 UTC)
Expired
Feb 11, 2009, 10:56 PM EST
In force
49 min
Issued by
NWS Baltimore/Washington
Area
Storm-based polygon

Counties Anne Arundel County, MD, Baltimore County, MD, Carroll County, MD, City of Baltimore, MD, Harford County, MD, Howard County, MD, Montgomery County, MD, Prince George's County, MD, Arlington County, VA, City of Alexandria, VA, City of Falls Church, VA, Fairfax County, VA

The radar

The Sterling radar (KLWX), 54 km from the middle of the area, began a volume at 03:09 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
Feb 11, 8:19 PM ESTSevere Thunderstorm WatchSPC3 hr

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 Feb 11, 10:02 PM EST, 5 minutes earlier.

Area forecast discussion, Feb 11, 10:02 PM EST, 5 minutes before
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Hazardous weather outlook, Feb 11, 6:57 PM EST, 3 hours 10 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
657 PM EST WED FEB 11 2009

ANZ530>537-DCZ001-MDZ006-007-011-013-014-016>018-VAZ052>057-
121000-
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-
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-
657 PM EST WED FEB 11 2009

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...TONIGHT

A SMALL CRAFT ADVISORY IS IN EFFECT THROUGH 10 PM THIS EVENING
FOR THE TIDAL POTOMAC RIVER AND MARYLAND CHESAPEAKE BAY. AFTER 10
PM...A GALE WARNING IS IN EFFECT OVERNIGHT ACROSS THE MARINE
WATERS.

A COLD FRONT WILL MOVE ACROSS THE OUTLOOK AREA TONIGHT. SHOWERS
AND ISOLATED THUNDERSTORMS WILL ACCOMPANY THE FRONT...MOST LIKELY
BETWEEN 10 PM AND 2 AM. THIS ACTIVITY WILL HAVE THE POTENTIAL TO
PRODUCE STRONG GUSTY WINDS.

A WIND ADVISORY HAS BEEN ISSUED STARTING AT 2 AM FOR STRONG GUSTY
WINDS BEHIND THE FRONTAL PASSAGE.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THE WIND ADVISORY WILL CONTINUE THROUGH MIDNIGHT THURSDAY NIGHT.

IN ADDITION...DUE TO LOW RELATIVE HUMIDITIES AND GUSTY WINDS A
FIRE WEATHER WATCH HAS BEEN ISSUED FOR THURSDAY FOR MOST OF THE
AREA.

A GALE WARNING CONTINUES ACROSS THE WATERS THROUGH THURSDAY
EVENING.

A DISTURBANCE WILL TRACK ACROSS THE REGION THIS WEEKEND...BRINGING
THE POTENTIAL FOR WINTRY PRECIPITATION TO THE AREA ON SATURDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS HAVE BEEN ACTIVATED. REPORTS OF WIND GUSTS OR WIND DAMAGE
WOULD BE GREATLY APPRECIATED.

MDZ003>005-009-010-501-502-VAZ021-025>031-036>042-050-051-
WVZ050>055-501>504-121000-
WASHINGTON-FREDERICK MD-CARROLL-MONTGOMERY-HOWARD-
EXTREME WESTERN ALLEGANY-CENTRAL AND EASTERN ALLEGANY-HIGHLAND-
AUGUSTA-ROCKINGHAM-SHENANDOAH-FREDERICK VA-PAGE-WARREN-CLARKE-
NELSON-ALBEMARLE-GREENE-MADISON-RAPPAHANNOCK-FAUQUIER-LOUDOUN-
ORANGE-CULPEPER-HAMPSHIRE-MORGAN-BERKELEY-JEFFERSON-PENDLETON-
HARDY-WESTERN GRANT-EASTERN GRANT-WESTERN MINERAL-EASTERN MINERAL-
657 PM EST WED FEB 11 2009

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...TONIGHT

A SEVERE THUNDERSTORM WATCH HAS BEEN ISSUED FOR THE POTOMAC
HIGHLANDS...SHENANDOAH VALLEY...AND THE CENTRAL FOOTHILLS OF VIRGINIA
UNTIL 10 PM. ANY THUNDERSTORMS THAT BECOME SEVERE WILL HAVE THE
POTENTIAL TO PRODUCE DAMAGING WIND GUSTS.

A COLD FRONT WILL MOVE ACROSS THE OUTLOOK AREA EARLY TONIGHT.
SHOWERS AND ISOLATED THUNDERSTORMS WILL ACCOMPANY THE FRONT...MOST
LIKELY BETWEEN 8 PM AND 1 AM. THIS ACTIVITY WILL HAVE THE
POTENTIAL TO PRODUCE STRONG GUSTY WINDS...A FEW OF WHICH COULD
REACH SEVERE LEVELS UP TO 60 MPH.

A HIGH WIND WARNING HAS BEEN ISSUED FOR STRONG GUSTY WINDS UP TO
60 MPH BEHIND THE FRONTAL PASSAGE STARTING LATER THIS EVENING. THE
WARNING IS IN EFFECT FOR AREAS WEST OF THE BLUE RIDGE IN
VIRGINIA...AS WELL AS LOUDOUN COUNTY...THE EASTERN PANHANDLE OF
WEST VIRGINIA...AND WESTERN MARYLAND INCLUDING FREDERICK COUNTY. A
WIND ADVISORY IS IN EFFECT FOR AREAS EAST OF THIS FOR WINDS
GUSTING UP TO 50 MPH.

A WINTER WEATHER ADVISORY HAS BEEN ISSUED FOR THE FAVORED UPSLOPE
AREAS OF THE ALLEGHENY AND POTOMAC HIGHLANDS STARTING AT 4 AM.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THE HIGH WARNING AND WIND ADVISORY WILL CONTINUE THROUGH MIDNIGHT
THURSDAY NIGHT.

IN ADDITION...DUE TO LOW RELATIVE HUMIDITIES AND GUSTY
WINDS A FIRE WEATHER WATCH HAS BEEN ISSUED FOR THURSDAY FOR MUCH
OF THE AREA.

THE WINTER WEATHER ADVISORY WILL CONTINUE THROUGH 4 PM FOR THE
FAVORED UPSLOPE AREAS OF THE ALLEGHENY AND POTOMAC HIGHLANDS.

A DISTURBANCE WILL TRACK ACROSS THE REGION THIS WEEKEND...BRINGING
THE POTENTIAL FOR WINTRY PRECIPITATION TO THE AREA ON SATURDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS HAVE BEEN ACTIVATED. REPORTS OF SNOW...WIND GUSTS...OR
WIND DAMAGE WOULD BE GREATLY APPRECIATED.

In the hours before

Local storm report, Feb 11, 8:53 PM EST, 1 hour 14 minutes before
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Local storm report, Feb 11, 9:06 PM EST, 1 hour 1 minute before
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Special weather statement, Feb 11, 9:10 PM EST, 57 minutes before
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Local storm report, Feb 11, 9:23 PM EST, 44 minutes before
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Local storm report, Feb 11, 9:27 PM EST, 40 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
927 PM EST WED FEB 11 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0915 PM     TSTM WND GST     STANARDSVILLE           38.30N 78.44W
02/11/2009  M60.00 MPH       GREENE             VA   TRAINED SPOTTER

&&

LEE
Local storm report, Feb 11, 9:39 PM EST, 28 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
939 PM EST WED FEB 11 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0925 PM     TSTM WND DMG     BOYCE                   39.09N 78.06W
02/11/2009                   CLARKE             VA   TRAINED SPOTTER

            TREES DOWN ON POWER LINES.

&&

LEE

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 11, 7:22 PM ESTSevere Thunderstorm WarningLWXAugusta, Highland, Rockingham53 min
Feb 11, 8:10 PM ESTSevere Thunderstorm WarningLWXAlbemarle, Augusta, Greene, Nelson, Rockingham, City of Charlottesville and 3 more65 min
Feb 11, 8:17 PM ESTSevere Thunderstorm WarningLWXAugusta, Frederick, Highland, Rockingham, Shenandoah, City of Winchester58 min
Feb 11, 8:35 PM ESTSevere Thunderstorm WarningLWXFrederick70 min
Feb 11, 8:54 PM ESTSevere Thunderstorm WarningLWXClarke, Frederick, Greene, Madison, Page, Rappahannock and 2 more51 min
Feb 11, 9:19 PM ESTSevere Thunderstorm WarningLWXAlbemarle, Clarke, Culpeper, Fauquier, Greene, Loudoun and 4 more36 min
Feb 11, 9:33 PM ESTSevere Thunderstorm WarningLWXFairfax, Fauquier, Loudoun, Prince William, Spotsylvania, Stafford and 4 more43 min
Feb 11, 9:37 PM ESTSpecial Marine WarningLWX61 min
Feb 11, 9:51 PM ESTSpecial Marine WarningLWX39 min
Feb 11, 10:14 PM ESTSpecial Marine WarningLWX44 min
Feb 12, 4:08 AM ESTStorm WarningLWX12 hr
Feb 12, 6:49 AM ESTRed Flag WarningLWXAlbemarle, Arlington, Augusta, Clarke, Culpeper, Fairfax and 19 more14 hr
Feb 11, 7:31 PM ESTSevere Thunderstorm WarningLWXAllegany74 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2009Severe Thunderstorm Warnings in Virginia, 2009Every severe thunderstorm warning in 2009

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.