Alert archive / Virginia / Flash Flood Warnings in 2005

Flash Flood Warning 50, NWS Baltimore/Washington

November 29, 2005Nelson County, Virginia

NWS Baltimore/Washington issued this flash flood warning at Nov 29, 2005, 10:04 AM EST for Nelson County, Virginia. It was in force for 4 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
Nov 29, 2005, 10:04 AM EST (15:04 UTC)
Expired
Nov 29, 2005, 2:00 PM EST
In force
4 hr
Issued by
NWS Baltimore/Washington
Area
Counties, with a storm outline in the text

County Nelson County, VA

The radar

The Roanoke radar (KFCX), 149 km from the middle of the area, began a volume at 15:06 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

Roanoke, VA (KRNK), launched 12:00Z, 3.1 hours before the alert went out and 85 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, Roanoke, VA at 12:00Z on 2005-11-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 137 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, Roanoke, VA at 12:00Z on 2005-11-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 343 square meters per square second.1939587897Sfc1 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
137 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
539 m above ground
0-6 km bulk shear
66 kt
0-1 km storm-relative helicity
343 m²/s²
0-3 km storm-relative helicity
426 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.9

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 Nov 29, 6:50 AM EST, 3 hours 14 minutes earlier.

Area forecast discussion, Nov 29, 6:50 AM EST, 3 hours 14 minutes before
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Hazardous weather outlook, Nov 29, 9:54 AM EST, 10 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
954 AM EST TUE NOV 29 2005

ANZ530>537-DCZ001-MDZ002>007-009>011-013-014-016>018-VAZ021-
025>031-036>042-050>057-WVZ048>055-301000-
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-
954 AM EST TUE NOV 29 2005

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...TODAY AND TONIGHT

A COLD FRONT WILL APPROACH FROM THE WEST TODAY. WIDESPREAD SHOWERS
AND A FEW THUNDERSTORMS ARE EXPECTED ACROSS THE OUTLOOK AREA. THE
STRONGEST OF THESE STORMS COULD CONTAIN DAMAGING WIND GUSTS OF 60
MPH OR HIGHER. BRIEF HEAVY RAIN WILL ALSO OCCUR...POSSIBLY CAUSING
SOME PONDING WATER PROBLEMS.

GUSTY WINDS OF 30 TO 35 MPH WILL OCCUR TODAY AND EARLY THIS EVENING.
MOTORISTS...ESPECIALLY ON EAST TO WEST ROADS...SHOULD USE CAUTION.

A SMALL CRAFT ADVISORY REMAINS IN EFFECT ON THE TIDAL POTOMAC AND
CHESAPEAKE BAY TODAY AND TONIGHT. MINOR COASTAL FLOODING WILL BE
POSSIBLE AT TIMES OF HIGH TIDE THIS AFTERNOON AND TONIGHT.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

.SPOTTER INFORMATION STATEMENT...

GUYER

In the hours before

Special weather statement, Nov 29, 5:27 AM EST, 4 hours 37 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
527 AM EST TUE NOV 29 2005

DCZ001-MDZ002>007-009>011-013-014-016>018-VAZ021-025>031-036>042-
050>057-WVZ048>055-291700-
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-
INCLUDING THE CITIES OF...WASHINGTON...CUMBERLAND...HAGERSTOWN...
FREDERICK...WESTMINSTER...GAITHERSBURG...COLUMBIA...BALTIMORE...
ANNAPOLIS...WALDORF...ST MARYS CITY...STAUNTON...WAYNESBORO...
HARRISONBURG...WINCHESTER...FRONT ROYAL...CHARLOTTESVILLE...
LEESBURG...CULPEPER...MANASSAS...MANASSAS PARK...FAIRFAX...
ALEXANDRIA...FALLS CHURCH...FREDERICKSBURG...BAYARD...
PETERSBURG...KEYSER...MARTINSBURG...CHARLES TOWN
527 AM EST TUE NOV 29 2005

...STRONG WINDS AND A FEW THUNDERSTORMS TODAY...

AS A COLD FRONT APPROACHES THE REGION FROM THE WEST...A LINE OF
THUNDERSTORMS MAY DEVELOP THIS AFTERNOON ACROSS CENTRAL AND
NORTHERN VIRGINIA AND INTO THE DC AND BALTIMORE REGIONS. A FEW OF
THESE STORMS COULD REACH SEVERE LIMITS WITH A THREAT FOR WIND
GUSTS OF 60 MPH OR HIGHER. THE THREAT FOR AFTERNOON SEVERE STORMS
WILL MAINLY BE FROM WEST OF WASHINGTON DC ALONG I-66...AND SOUTH
THROUGH THE CENTRAL SHENANDOAH VALLEY AND CHARLOTTESVILLE AREAS.

IN ADDITION...BRIEF HEAVY RAIN WILL BE POSSIBLE AT TIMES TODAY AND
EARLY THIS EVENING. PONDING WATER AND MINOR FLOODING OF POOR
DRAINAGE AREAS WILL BE POSSIBLE.

ACROSS THE ENTIRE AREA...GUSTY WINDS OF 30 TO 35 MPH WILL BE
POSSIBLE TODAY AND EARLY THIS EVENING. MOTORISTS...ESPECIALLY ON
EAST TO WEST ROADS...SHOULD USE CAUTION.

The office that day

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

IssuedProductOfficeCountiesLasted
Nov 29, 10:12 AM ESTFlash Flood WarningLWXAugusta4 hr
Nov 29, 6:12 PM ESTSevere Thunderstorm WarningLWXWashington48 min
Nov 29, 6:31 PM ESTSevere Thunderstorm WarningLWXFrederick59 min
Nov 29, 6:51 PM ESTFlash Flood WarningLWXWashington3 hr
Nov 29, 4:42 PM ESTFlash Flood WarningLWXHardy2 hr
Nov 29, 5:32 PM ESTSevere Thunderstorm WarningLWXHampshire17 min
Nov 29, 5:40 PM ESTFlash Flood WarningLWXMorgan3 hr

Nearby

Flash Flood Warnings in Virginia, 2005Every flash flood warning in 2005

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.