Alert archive / Virginia / Flash Flood Warnings in 2010

Flash Flood Warning 46, NWS Baltimore/Washington

September 30, 201014 counties in Virginia; 6 counties in Maryland

NWS Baltimore/Washington issued this flash flood warning at Sep 30, 2010, 4:57 AM EDT for 14 counties in Virginia; 6 counties in Maryland. It was in force for 6 hr. 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 30, 2010, 4:57 AM EDT (08:57 UTC)
Expired
Sep 30, 2010, 10:45 AM EDT
In force
6 hr
Issued by
NWS Baltimore/Washington
Area
Storm-based polygon
Flood severity
None

Counties Anne Arundel County, MD, Calvert County, MD, Charles County, MD, Montgomery County, MD, Prince George's County, MD, Saint Mary's County, MD, Arlington County, VA, City of Alexandria, VA, City of Fairfax, VA, City of Falls Church, VA, City of Fredericksburg, VA, City of Manassas, VA, City of Manassas Park, VA, Fairfax County, VA, Fauquier County, VA, King George County, VA, Loudoun County, VA, Prince William County, VA, Spotsylvania County, VA, Stafford County, VA

The radar

The Sterling radar (KLWX), 40 km from the middle of the area, began a volume at 08:56 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 forecasters said that day

The local office's own words before this flash flood 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 flash flood warning went out at Sep 30, 3:28 AM EDT, 1 hour 29 minutes earlier.

Area forecast discussion, Sep 30, 3:28 AM EDT, 1 hour 29 minutes before
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Hazardous weather outlook, Sep 30, 3:58 AM EDT, 59 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
358 AM EDT THU SEP 30 2010

ANZ530>543-DCZ001-MDZ006-007-011-013-014-016>018-VAZ052>057-
011000-
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-
358 AM EDT THU SEP 30 2010

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...TODAY

A FLASH FLOOD WATCH IS IN EFFECT TODAY FOR THE ENTIRE OUTLOOK AREA.
PLEASE REFER TO THE LATEST HAZARD PRODUCT /FFALWX/ FOR DETAILS.

A GALE WARNING IS IN EFFECT FOR THE LOWER TIDAL POTOMAC AND
MARYLAND CHESAPEAKE BAY. A SMALL CRAFT ADVISORY IS IN EFFECT FOR
THE UPPER POTOMAC. PLEASE REFER TO THE LATEST HAZARD PRODUCT
/MWWLWX/ FOR DETAILS.

A WIND ADVISORY IS IN EFFECT FOR COASTAL PORTIONS OF SOUTHERN
MARYLAND. PLEASE REFER TO THE LATEST HAZARD MESSAGE /NPWLWX/ FOR
DETAILS.

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS TODAY FOR EASTERN
MARYLAND...THE CHESAPEAKE BAY AND LOWER TIDAL POTOMAC RIVER. ANY
THUNDERSTORMS THAT FORM WILL BE CAPABLE OF PRODUCING DAMAGING WIND
GUSTS AND ISOLATED TORNADOES.

.DAYS TWO THROUGH SEVEN...TONIGHT THROUGH WEDNESDAY

A SMALL CRAFT ADVISORY IS IN EFFECT TONIGHT FOR THE MARYLAND
CHESAPEAKE BAY AND TIDAL POTOMAC RIVER AND MAY BE CONTINUED ON
FRIDAY AND FRIDAY NIGHT.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NECESSARY TODAY. PLEASE RELAY REPORTS OF
HAZARDOUS WEATHER PROMPTLY TO THE NATIONAL WEATHER SERVICE.

MDZ003>005-009-010-501-502-VAZ021-025>031-036>040-042-050-051-501-
502-WVZ050>055-501>504-011000-
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-LOUDOUN-ORANGE-
CULPEPER-NORTHERN FAUQUIER-SOUTHERN FAUQUIER-HAMPSHIRE-MORGAN-
BERKELEY-JEFFERSON-PENDLETON-HARDY-WESTERN GRANT-EASTERN GRANT-
WESTERN MINERAL-EASTERN MINERAL-
358 AM EDT THU SEP 30 2010

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...TODAY

A FLASH FLOOD WATCH IS IN EFFECT TODAY FOR THE ENTIRE AREA.
PLEASE REFER TO THE LATEST HAZARD MESSAGE /FFALWX/ FOR DETAILS.

.DAYS TWO THROUGH SEVEN...TONIGHT THROUGH WEDNESDAY

MAIN STEM RIVER FLOODING MAY OCCUR LATE TONIGHT AND FRIDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NECESSARY TODAY. PLEASE RELAY REPORTS
OF HAZARDOUS WEATHER TO THE NATIONAL WEATHER SERVICE.

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 29, 8:48 PM EDTCoastal Flood AdvisoryLWXArlington, Fairfax, King George, Stafford, City of Alexandria, City of Fairfax and 1 more25 hr
Sep 29, 9:09 PM EDTSmall Craft AdvisoryLWX60 hr
Sep 30, 2:59 AM EDTSpecial Marine WarningLWX91 min
Sep 30, 3:10 AM EDTSpecial Marine WarningLWX65 min
Sep 30, 4:51 AM EDTSpecial Marine WarningLWX39 min
Sep 30, 6:22 AM EDTSpecial Marine WarningLWX38 min
Sep 30, 6:30 AM EDTSpecial Marine WarningLWX27 min
Sep 30, 6:39 AM EDTFlash Flood WarningLWXLoudoun6 hr
Sep 30, 7:02 AM EDTSpecial Marine WarningLWX48 min
Sep 30, 7:48 AM EDTSpecial Marine WarningLWX42 min
Sep 30, 8:09 AM EDTCoastal Flood WarningLWXArlington, Fairfax, King George, Stafford, City of Alexandria, City of Fairfax and 1 more21 hr
Sep 30, 8:10 AM EDTFlash Flood WarningLWXAlbemarle, Augusta, Greene, Madison, Nelson, Page and 2 more6 hr
Sep 30, 8:18 AM EDTSpecial Marine WarningLWX42 min
Sep 30, 8:30 AM EDTSpecial Marine WarningLWX13 min
Sep 30, 8:50 AM EDTSpecial Marine WarningLWX55 min
Sep 30, 9:00 AM EDTSpecial Marine WarningLWX30 min
Sep 30, 9:35 AM EDTSpecial Marine WarningLWX40 min
Sep 30, 10:29 AM EDTFlash Flood WarningLWXAlbemarle, Clarke, Culpeper, Fauquier, Greene, Loudoun and 7 more4 hr
Sep 30, 10:38 AM EDTFlash Flood WarningLWXArlington, Culpeper, Fairfax, Fauquier, King George, Loudoun and 10 more6 hr
Sep 30, 10:45 AM EDTSpecial Marine WarningLWX45 min
Sep 30, 11:12 AM EDTRiver Flood WarningLWXLoudoun5 hr
Sep 30, 11:12 AM EDTRiver Flood WarningLWXLoudoun5 hr
Sep 30, 12:22 PM EDTFlash Flood WarningLWXLoudoun6 hr
Sep 30, 12:40 PM EDTSpecial Marine WarningLWX50 min
Sep 30, 2:48 PM EDTSpecial Marine WarningLWX87 min
Sep 30, 3:15 PM EDTSpecial Weather StatementLWXSpotsylvania30 min
Sep 30, 3:22 PM EDTSevere Thunderstorm WarningLWXCulpeper, Fauquier, Orange, Spotsylvania, Stafford38 min
Sep 30, 4:00 PM EDTSevere Thunderstorm WarningLWXCulpeper, Fairfax, Fauquier, Orange, Prince William, Spotsylvania and 3 more45 min
Sep 30, 4:16 PM EDTSpecial Marine WarningLWX89 min
Sep 30, 4:40 PM EDTFlash Flood WarningLWXFairfax, Loudoun, Prince William, City of Manassas, City of Manassas Park11 hr
Sep 30, 6:13 PM EDTFlash Flood WarningLWXArlington, Fairfax, King George, Prince William, Stafford, City of Alexandria and 2 more6 hr
Sep 30, 7:54 PM EDTFlash Flood WarningLWXSpotsylvania, Stafford, City of Fredericksburg5 hr
Sep 30, 3:57 AM EDTTornado WarningLWXAnne Arundel, Calvert, Saint Mary's33 min
Sep 30, 6:08 AM EDTSpecial Weather StatementLWXSaint Mary's52 min
Sep 30, 6:17 AM EDTTornado WarningLWXCalvert, Saint Mary's28 min
Sep 30, 7:32 AM EDTSpecial Weather StatementLWXSaint Mary's43 min
Sep 30, 8:45 AM EDTSevere Thunderstorm WarningLWXHarford45 min
Sep 30, 8:58 AM EDTTornado WarningLWXCalvert, Saint Mary's47 min
Sep 30, 9:28 AM EDTTornado WarningLWXAnne Arundel47 min
Sep 30, 9:49 AM EDTTornado WarningLWXAnne Arundel, Calvert26 min
Sep 30, 9:51 AM EDTRiver Flood WarningLWXMontgomery24 hr
Sep 30, 10:49 AM EDTSevere Thunderstorm WarningLWXHoward, Montgomery, Prince George's26 min
Sep 30, 11:12 AM EDTRiver Flood WarningLWXFrederick18 hr
Sep 30, 11:12 AM EDTRiver Flood WarningLWXWashington18 hr
Sep 30, 4:30 PM EDTFlash Flood WarningLWXAnne Arundel, Calvert, Saint Mary's6 hr
Sep 30, 11:12 AM EDTRiver Flood WarningLWXBerkeley18 hr

Nearby

Flash Flood Warnings in Virginia, 2010Flash Flood Warnings in Maryland, 2010Every flash flood warning in 2010

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.