Alert archive / Virginia / Flash Flood Warnings in 2006

Flash Flood Warning 35, NWS Baltimore/Washington

June 25, 2006Loudoun County, Virginia

NWS Baltimore/Washington issued this flash flood warning at Jun 25, 2006, 7:49 PM EDT for Loudoun County, Virginia. It was in force for 3 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: Jun 25, 2006, 7:49 PM EDT (23:49 UTC)
Expired: Jun 25, 2006, 10:45 PM EDT
In force: 3 hr
Issued by: NWS Baltimore/Washington
Area: Counties, with a storm outline in the text

County Loudoun County, VA

The radar

The Sterling radar (KLWX), 18 km from the middle of the area, began a volume at 23:52 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 12:00Z, 11.8 hours before the alert went out and 26 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 258 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 555 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: 57 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 Jun 25, 4:09 PM EDT, 3 hours 40 minutes earlier.

Area forecast discussion, Jun 25, 4:09 PM EDT, 3 hours 40 minutes before

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Hazardous weather outlook, Jun 25, 4:35 PM EDT, 3 hours 14 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
435 PM EDT SUN JUN 25 2006

ANZ530>537-DCZ001-MDZ002>007-009>011-013-014-016>018-VAZ021-
025>031-036>042-050>057-WVZ048>055-261000-
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-ALLEGANY-WASHINGTON-FREDERICK MD-CARROLL-
NORTHERN BALTIMORE-HARFORD-MONTGOMERY-HOWARD-SOUTHERN BALTIMORE-
PRINCE GEORGES-ANNE ARUNDEL-CHARLES-ST. MARYS-CALVERT-HIGHLAND-
AUGUSTA-ROCKINGHAM-SHENANDOAH-FREDERICK VA-PAGE-WARREN-CLARKE-
NELSON-ALBEMARLE-GREENE-MADISON-RAPPAHANNOCK-FAUQUIER-LOUDOUN-
ORANGE-CULPEPER-PRINCE WILLIAM/MANASSAS/MANASSAS PARK-FAIRFAX-
ARLINGTON/FALLS CHURCH/ALEXANDRIA-STAFFORD-SPOTSYLVANIA-
KING GEORGE-GRANT-MINERAL-HAMPSHIRE-MORGAN-BERKELEY-JEFFERSON-
PENDLETON-HARDY-
435 PM EDT SUN JUN 25 2006

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MARYLAND WEST OF THE
EASTERN SHORE INCLUDING THE CHESAPEAKE BAY AND EAST OF GARRETT
COUNTY...EASTERN WEST VIRGINIA...NORTHERN AND CENTRAL VIRGINIA...
WASHINGTON DC AND THE TIDAL POTOMAC RIVER.

.DAY ONE...TONIGHT

A FLASH FLOOD WATCH REMAINS IN EFFECT OVERNIGHT FOR MOST OF THE
OUTLOOK AREA FOR POTENTIAL FLASH FLOOD CONDITIONS. AN ADDITIONAL TWO
TO FOUR INCHES OF RAINFALL IS POSSIBLE THROUGH MONDAY MORNING ACROSS
MUCH OF THE AREA... PARTICULARLY FOR LOCATIONS WEST OF THE BLUE
RIDGE MOUNTAINS. WIDESPREAD FLOODING OF SMALL STREAMS AND CREEKS AND
LOW LYING AREAS IS LIKELY TO BECOME A SIGNIFICANT PROBLEM OVERNIGHT.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

A STATIONARY FRONT WILL REMAIN OVER OR NEAR THE REGION THROUGH
MIDWEEK CONTINUING THE THREAT FOR SHOWERS AND THUNDERSTORMS. GIVEN
THE HIGH MOISTURE CONTENT OF THE ATMOSPHERE...SOME STORMS COULD
PRODUCE HEAVY RAINFALL. ADDITIONAL MOISTURE WILL MOVE NORTH THROUGH
MID WEEK FROM A TROPICAL AIRMASS OVER THE SOUTHEAST STATES...THIS
MAY BRING RENEWED CONCERNS FOR FLASH FLOODING AND RIVER FLOODING.

.SPOTTER INFORMATION STATEMENT...

SKYWARN SPOTTERS AND EMERGENCY OFFICIALS...PLEASE RELAY ANY REPORTS
OF FLOODING TO THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA.
RAINFALL TOTALS WOULD ALSO BE APPRECIATED.

JB

In the hours before

Local storm report, Jun 25, 2:46 PM EDT, 5 hours 3 minutes before

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Local storm report, Jun 25, 2:48 PM EDT, 5 hours 1 minute before

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Special weather statement, Jun 25, 2:56 PM EDT, 4 hours 53 minutes before

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Local storm report, Jun 25, 5:05 PM EDT, 2 hours 44 minutes before

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Local storm report, Jun 25, 6:10 PM EDT, 1 hour 39 minutes before

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Local storm report, Jun 25, 6:42 PM EDT, 1 hour 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
642 PM EDT SUN JUN 25 2006

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

0630 PM     FLASH FLOOD      KEENE                   37.87N 78.56W
06/25/2006                   ALBEMARLE          VA   COUNTY OFFICIAL

            HIGH WATER ON ROUTE 20. OFFICIALS REPORT MULTIPLE ROADS

            IN SOUTHEAST PART OF COUNTY CLOSED DUE TO FLASH FLOODING.

&&

WOODCOCK

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 25, 7:30 AM EDT	Flash Flood Warning	LWX	Prince William	4 hr
Jun 25, 11:31 AM EDT	Flash Flood Warning	LWX	Fairfax	4 hr
Jun 25, 1:48 PM EDT	Flash Flood Warning	LWX	Fauquier, Prince William, City of Manassas	4 hr
Jun 25, 3:26 PM EDT	Flash Flood Warning	LWX	Augusta, Rockingham, City of Harrisonburg, City of Staunton, City of Waynesboro	6 hr
Jun 25, 3:39 PM EDT	Flash Flood Warning	LWX	Frederick, City of Winchester	6 hr
Jun 25, 3:54 PM EDT	Flash Flood Warning	LWX	Shenandoah	6 hr
Jun 25, 4:01 PM EDT	Flash Flood Warning	LWX	Albemarle, Nelson, City of Charlottesville	6 hr
Jun 25, 7:26 PM EDT	Flash Flood Warning	LWX	Fauquier	4 hr
Jun 25, 7:26 PM EDT	Flash Flood Warning	LWX	Fairfax, Prince William, City of Fairfax, City of Manassas, City of Manassas Park	4 hr
Jun 25, 3:43 PM EDT	Flash Flood Warning	LWX	Washington	6 hr
Jun 25, 7:06 PM EDT	Flash Flood Warning	LWX	Montgomery	4 hr
Jun 25, 7:17 PM EDT	Flash Flood Warning	LWX	Howard	4 hr
Jun 25, 1:08 PM EDT	Flash Flood Warning	LWX	Hampshire	4 hr

Nearby

Flash Flood Warnings in Virginia, 2006 Every flash flood warning in 2006

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.