Alert archive / Virginia / Flash Flood Warnings in 2011
Flash Flood Warning 125, NWS Baltimore/Washington
NWS Baltimore/Washington issued this flash flood warning at Sep 4, 2011, 10:28 PM EDT for Frederick County, Shenandoah County, Virginia; Hampshire County, Hardy County, West 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
- Sep 4, 2011, 10:28 PM EDT (02:28 UTC)
- Expired
- Sep 5, 2011, 1:30 AM EDT
- In force
- 3 hr
- Issued by
- NWS Baltimore/Washington
- Area
- Storm-based polygon
- Flood severity
- None
Counties Frederick County, VA, Shenandoah County, VA, Hampshire County, WV, Hardy County, WV
The radar
The Sterling radar (KLWX), 95 km from the middle of the area, began a volume at 02:29 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, 2.5 hours before the alert went out and 103 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.
- Mixed-layer CAPE
- 2382 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 895 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 63 m²/s²
- 0-3 km storm-relative helicity
- 64 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 2.2
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 4, 9:24 PM EDT, 1 hour 4 minutes earlier.
Area forecast discussion, Sep 4, 9:24 PM EDT, 1 hour 4 minutes before
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</html>Hazardous weather outlook, Sep 4, 8:08 PM EDT, 2 hours 20 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 808 PM EDT SUN SEP 4 2011 ANZ530>543-DCZ001-MDZ006-007-011-013-014-016>018-VAZ052>057- 051315- 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- 808 PM EDT SUN SEP 4 2011 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 MINOR COASTAL FLOODING IS ANTICIPATED AROUND THE HIGH TIDE TONIGHT ALONG THE UPPER PORTIONS OF THE TIDAL POTOMAC RIVER AND WESTERN SHORES OF THE MARYLAND CHESAPEAKE BAY. A COASTAL FLOOD ADVISORY HAS BEEN ISSUED FOR THE EVENING AND OVERNIGHT HIGH TIDE CYCLE. SEE WBCCFWLWX FOR FURTHER DETAILS. A SMALL CRAFT ADVISORY IS IN EFFECT TONIGHT FOR MUCH OF THE MARYLAND CHESAPEAKE BAY AND THE LOWER TIDAL POTOMAC RIVER TONIGHT. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THE SMALL CRAFT ADVISORY FOR MUCH OF THE MARYLAND CHESAPEAKE BAY AND THE LOWER TIDAL POTOMAC RIVER CONTINUES THROUGH MONDAY. SHOWERS AND THUNDERSTORMS MAY PRODUCE VERY HEAVY RAINFALL MONDAY AND TUESDAY AS TROPICAL MOISTURE INTERACTS WITH A SLOW-MOVING COLD FRONT. FLASH FLOODING MAY RESULT. HEAVY PRECIPITATION AND POTENTIAL FLOODING COULD LAST WELL INTO NEXT WEEK. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED TONIGHT. MDZ003>005-009-010-501-502-VAZ025>031-036>040-042-050-051-501>504- WVZ050>053-055-501>506-051315- 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- 808 PM EDT SUN SEP 4 2011 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 THUNDERSTORMS ARE LIKELY WEST OF THE BLUE RIDGE THIS AFTERNOON THROUGH TONIGHT. A FEW STORMS MAY BECOME SEVERE...WITH THE POTENTIAL TO PRODUCE DAMAGING WIND GUSTS...LARGE HAIL AND LOCALLY HEAVY RAINFALL. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY SHOWERS AND THUNDERSTORMS MAY PRODUCE VERY HEAVY RAINFALL MONDAY AND TUESDAY AS TROPICAL MOISTURE INTERACTS WITH A SLOW-MOVING COLD FRONT. FLASH FLOODING MAY RESULT. HEAVY PRECIPITATION AND POTENTIAL FLOODING COULD LAST WELL INTO NEXT WEEK. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED TONIGHT.
In the hours before
Special weather statement, Sep 4, 5:07 PM EDT, 5 hours 21 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
507 PM EDT SUN SEP 4 2011
MDZ501-502-WVZ050-055-501>505-042130-
HARDY WV-HAMPSHIRE WV-WESTERN GRANT WV-EASTERN GRANT WV-
CENTRAL AND EASTERN ALLEGANY MD-EXTREME WESTERN ALLEGANY MD-
WESTERN MINERAL WV-EASTERN MINERAL WV-WESTERN PENDLETON WV-
507 PM EDT SUN SEP 4 2011
...STRONG THUNDERSTORMS WITH HEAVY RAINFALL TO AFFECT
HARDY...HAMPSHIRE...GRANT...ALLEGANY...MINERAL AND WESTERN PENDLETON
COUNTIES...
AT 502 PM EDT...DOPPLER RADAR INDICATED STRONG THUNDERSTORMS ALONG A
LINE EXTENDING FROM 3 MILES WEST OF NEW CREEK TO 2 MILES SOUTH OF
MOUNT STORM TO KLINE GAP TO 6 MILES SOUTHWEST OF HOPEVILLE...MOVING
NORTHEAST AT 25 MPH.
THESE THUNDERSTORMS WILL PROVIDE THE MOUNTAIN COMMUNITIES OF
GRANT...MINERAL...AND NORTHWESTERN PENDLETON COUNTIES WITH
TORRENTIAL RAINFALL. TWO INCHES OF RAIN WILL BE POSSIBLE WITHIN AN
HOUR. THESE RAINFALL RATES WILL CAUSE RAPID WITHIN BANK RISES ON
CREEKS AND STREAMS...AS WELL AS CAUSE PONDING OF WATER IN LOW LYING
AREAS. RURAL UNPAVED ROADS MAY BECOME DIFFICULT TO CROSS.
AREA RESIDENTS SHOULD MONITOR THE LATEST WEATHER CONDITIONS FOR ANY
POSSIBLE WARNINGS. IF YOU LIVE OR CAMP IN A LOW LYING AREA...ALWAYS
SEEK HIGHER GROUND IF RAPID STREAM LEVEL RISES THREATEN YOUR
LOCATION.
&&
LAT...LON 3967 7875 3947 7896 3928 7895 3899 7912
3887 7934 3889 7944 3895 7936 3906 7930
3909 7934 3916 7934 3919 7930 3921 7931
3921 7934 3940 7914
TIME...MOT...LOC 2102Z 224DEG 23KT 3938 7907 3926 7923
3907 7921 3891 7936
HTSThe office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 5, 4:06 AM EDT | Flash Flood Watch | LWX | Arlington, Clarke, Culpeper, Fairfax, Fauquier, Frederick and 22 more | 5 days |
| Sep 5, 1:41 PM EDT | Coastal Flood Advisory | LWX | Arlington, Fairfax, King George, Stafford, City of Alexandria, City of Fairfax and 1 more | 16 hr |
| Sep 4, 11:54 PM EDT | Special Weather Statement | LWX | Carroll, Frederick | 66 min |
| Sep 5, 3:05 PM EDT | Special Weather Statement | LWX | Baltimore, City of Baltimore | 25 min |
| Sep 5, 3:36 PM EDT | Special Weather Statement | LWX | Prince George's | 24 min |
Nearby
Flash Flood Warnings in Virginia, 2011Flash Flood Warnings in West Virginia, 2011Every flash flood warning in 2011
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.