Alert archive / Virginia / Flash Flood Warnings in 2010

Flash Flood Warning 64, NWS Baltimore/Washington

December 1, 20106 counties in Virginia

NWS Baltimore/Washington issued this flash flood warning at Dec 1, 2010, 4:34 AM EST for 6 counties in Virginia. 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
Dec 1, 2010, 4:34 AM EST (09:34 UTC)
Expired
Dec 1, 2010, 10:30 AM EST
In force
6 hr
Issued by
NWS Baltimore/Washington
Area
Storm-based polygon
Flood severity
None

Counties Culpeper County, VA, Fauquier County, VA, Greene County, VA, Madison County, VA, Orange County, VA, Rappahannock County, VA

The radar

The Sterling radar (KLWX), 78 km from the middle of the area, began a volume at 09:37 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 00:00Z, 9.6 hours before the alert went out and 81 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 00:00Z on 2010-12-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 00:00Z on 2010-12-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 416 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
671 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
416 m²/s²
0-3 km storm-relative helicity
505 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 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 Dec 1, 3:52 AM EST, 42 minutes earlier.

Area forecast discussion, Dec 1, 3:52 AM EST, 42 minutes before
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Hazardous weather outlook, Dec 1, 4:03 AM EST, 31 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
403 AM EST WED DEC 1 2010

ANZ530>543-DCZ001-MDZ006-007-011-013-014-016>018-VAZ052>057-
021000-
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-
403 AM EST WED DEC 1 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 AND TONIGHT

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS MUCH OF THE
OUTLOOK AREA. SOME STORMS WILL BE CAPABLE OF PRODUCING DAMAGING
WIND GUSTS AND ISOLATED TORNADOES EARLY THIS MORNING. A TORNADO WATCH
HAS BEEN ISSUED FOR THE AREA UNTIL 10 AM EST. PLEASE REFER TO THE
LATEST HAZARD MESSAGE /WCNLWX/ FOR DETAILS.

A FLASH FLOOD WATCH IS IN EFFECT THROUGH 100 PM EST FOR PORTIONS OF
THE OUTLOOK AREA. PLEASE REFER TO THE LATEST HAZARD MESSAGE
/FFALWX/ FOR DETAILS.

A COASTAL FLOOD ADVISORY IS IN EFFECT ALONG THE WESTERN SHORE OF
THE MARYLAND CHESAPEAKE BAY AND FOR THE DISTRICT OF COLUMBIA AND
ARLINGTON COUNTY. PLEASE REFER TO THE LATEST HAZARD MESSAGE
/CFWLWX/ FOR DETAILS.

A WIND ADVISORY IS IN EFFECT THIS MORNING. PLEASE REFER TO THE LATEST
HAZARD MESSAGE /NPWLWX/ FOR DETAILS.

A GALE WARNING IS IN EFFECT THIS MORNING FOR THE CHESAPEAKE BAY
AND TIDAL POTOMAC RIVER. A SMALL CRAFT ADVISORY WILL BE NEEDED FOR
PORTIONS OF THE WATERS THIS AFTERNOON AND TONIGHT.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

A SMALL CRAFT ADVISORY LIKELY WILL BE NEEDED THURSDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL BE NEEDED THIS MORNING.

MDZ003>005-009-010-501-502-VAZ025>031-036>040-042-050-051-501>504-
WVZ050>053-055-501>506-021000-
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-
403 AM EST WED DEC 1 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 AND TONIGHT

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FOR PORTIONS OF THE
OUTLOOK AREA. SOME STORMS WILL BE CAPABLE OF PRODUCING DAMAGING
WIND GUSTS AND ISOLATED TORNADOES THIS MORNING. A TORNADO WATCH IS IN
EFFECT FOR AREAS ALONG AND EAST OF THE BLUE RIDGE UNTIL 10 AM EST.
PLEASE REFER TO THE LATEST HAZARD MESSAGE /WCNLWX/ FOR DETAILS.

A HIGH WIND WARNING HAS BEEN ISSUED FOR THE BLUE RIDGE OF VIRGINIA
THIS MORNING. A WIND ADVISORY IS IN EFFECT FOR PORTIONS OF THE
AREA.  PLEASE REFER TO THE LATEST HAZARD MESSAGE /NPWLWX/ FOR
DETAILS.

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

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL BE NEEDED THIS MORNING.

SBK

In the hours before

Local storm report, Dec 1, 3:09 AM EST, 1 hour 25 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
309 AM EST WED DEC 01 2010

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

0134 AM     NON-TSTM WND GST 2 SSE MOUNT TORRY FURNA 37.92N  78.95W
12/01/2010  M62 MPH          NELSON             VA   MESONET

            WNTRE

&&

EVENT NUMBER LWX1001092

KRAMAR
Local storm report, Dec 1, 3:11 AM EST, 1 hour 23 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
311 AM EST WED DEC 01 2010

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

1200 AM     NON-TSTM WND GST 2 SSE MOUNT TORRY FURNA 37.92N  78.95W
12/01/2010  M59 MPH          NELSON             VA   MESONET

            WNTRE

&&

EVENT NUMBER LWX1001093

KRAMAR

The office that day

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

IssuedProductOfficeCountiesLasted
Dec 1, 2:05 AM ESTFlash Flood WarningLWXHighland8 hr
Dec 1, 2:43 AM ESTFlash Flood WarningLWXAlbemarle, Augusta, Nelson, City of Charlottesville, City of Staunton, City of Waynesboro6 hr
Dec 1, 2:55 AM ESTSevere Thunderstorm WarningLWXAlbemarle, Augusta, Nelson, City of Charlottesville65 min
Dec 1, 3:06 AM ESTHigh Wind WarningLWXGreene, Madison, Nelson, Page, Rappahannock, Rockingham and 4 more3 hr
Dec 1, 3:21 AM ESTTornado WarningLWXAlbemarle, Nelson, City of Charlottesville24 min
Dec 1, 3:28 AM ESTSevere Thunderstorm WarningLWXAlbemarle, Augusta, Culpeper, Greene, Madison, Orange and 3 more47 min
Dec 1, 4:06 AM ESTSevere Thunderstorm WarningLWXAlbemarle, Culpeper, Greene, Madison, Orange, Rappahannock and 1 more54 min
Dec 1, 4:29 AM ESTFlash Flood WarningLWXClarke, Frederick, Greene, Page, Rockingham, Shenandoah and 3 more6 hr
Dec 1, 4:58 AM ESTSevere Thunderstorm WarningLWXCulpeper, Fairfax, Fauquier, Loudoun, Orange, Prince William and 6 more47 min
Dec 1, 5:44 AM ESTSevere Thunderstorm WarningLWXFairfax, Fauquier, Loudoun, Prince William, City of Manassas, City of Manassas Park26 min
Dec 1, 6:01 AM ESTSpecial Weather StatementLWXArlington, Fairfax, Loudoun, Prince William, City of Alexandria, City of Fairfax and 3 more119 min
Dec 1, 7:25 AM ESTSevere Thunderstorm WarningLWXClarke, Loudoun35 min
Dec 1, 9:37 AM ESTSpecial Weather StatementLWXArlington, City of Alexandria, City of Falls Church23 min
Dec 1, 10:02 AM ESTAreal Flood WarningLWXFrederick, Rockingham, Shenandoah3 hr
Dec 1, 11:16 AM ESTGale WarningLWX3 hr
Dec 1, 11:16 AM ESTSmall Craft AdvisoryLWX30 hr
Dec 1, 4:18 AM ESTFlash Flood WarningLWXAllegany, Washington6 hr
Dec 1, 4:22 AM ESTSevere Thunderstorm WarningLWXAllegany, Washington22 min
Dec 1, 5:25 AM ESTCoastal Flood WarningLWXAnne Arundel, Baltimore, City of Baltimore9 hr
Dec 1, 6:20 AM ESTSpecial Weather StatementLWXHarford10 min
Dec 1, 6:37 AM ESTSevere Thunderstorm WarningLWXCalvert, Charles, Saint Mary's53 min
Dec 1, 8:03 AM ESTSevere Thunderstorm WarningLWXBaltimore, Carroll, Frederick, Howard, Montgomery42 min
Dec 1, 9:00 AM ESTSevere Thunderstorm WarningLWXAnne Arundel, Baltimore, Carroll, Harford, Howard, City of Baltimore75 min
Dec 1, 9:28 AM ESTTornado WarningLWXCharles, Prince George's17 min
Dec 1, 9:43 AM ESTSpecial Weather StatementLWXAnne Arundel, Calvert, Prince George's, Saint Mary's62 min
Dec 1, 2:37 PM ESTRiver Flood WarningLWXWashington26 hr

Nearby

Flash Flood Warnings in Virginia, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.