Alert archive / Virginia / Flood Watches in 2011

Flood Watch 3, NWS Wakefield, VA

August 25, 201127 counties in Virginia; 9 counties in North Carolina; 4 counties in Maryland

NWS Wakefield, VA issued this flood watch at Aug 25, 2011, 11:51 PM EDT for 27 counties in Virginia; 9 counties in North Carolina; 4 counties in Maryland. It took effect at Aug 26, 2011, 8:00 PM EDT. It was in force for 32 hr.

The area

The counties it named.

The facts

Issued: Aug 25, 2011, 11:51 PM EDT (03:51 UTC)
In effect from: Aug 26, 2011, 8:00 PM EDT
Expired: Aug 28, 2011, 3:46 AM EDT
In force: 32 hr
Issued by: NWS Wakefield, VA
Flood severity: None

All 40 counties

Dorchester County, MD, Somerset County, MD, Wicomico County, MD, Worcester County, MD, Bertie County, NC, Camden County, NC, Chowan County, NC, Currituck County, NC, Gates County, NC, Hertford County, NC, Northampton County, NC, Pasquotank County, NC, Perquimans County, NC, Accomack County, VA, Brunswick County, VA, Caroline County, VA, Charles City County, VA, City of Chesapeake, VA, City of Emporia, VA, City of Franklin, VA, City of Hopewell, VA, City of Petersburg, VA, City of Virginia Beach, VA, City of Williamsburg, VA, Dinwiddie County, VA, Gloucester County, VA, Greensville County, VA, James City County, VA, Lancaster County, VA, Mathews County, VA, Middlesex County, VA, New Kent County, VA, Northampton County, VA, Northumberland County, VA, Prince George County, VA, Richmond County, VA, Southampton County, VA, Surry County, VA, Sussex County, VA, Westmoreland County, VA

The radar

The Norfolk radar (KAKQ), 34 km from the middle of the area, began a volume at 03:52 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 00:00Z, 3.9 hours before the alert went out and 209 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: 1032 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 823 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 68 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.5

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Wakefield, VA wrote its last area forecast discussion before this flood watch went out at Aug 25, 7:32 PM EDT, 4 hours 19 minutes earlier.

Area forecast discussion, Aug 25, 7:32 PM EDT, 4 hours 19 minutes before

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Hazardous weather outlook, Aug 25, 8:19 PM EDT, 3 hours 32 minutes before

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In the hours before

Local storm report, Aug 25, 6:55 PM EDT, 4 hours 56 minutes before

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Local storm report, Aug 25, 7:01 PM EDT, 4 hours 50 minutes before

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Local storm report, Aug 25, 7:43 PM EDT, 4 hours 8 minutes before

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Special weather statement, Aug 25, 7:50 PM EDT, 4 hours 1 minute before

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Special weather statement, Aug 25, 8:05 PM EDT, 3 hours 46 minutes before

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Special weather statement, Aug 25, 9:46 PM EDT, 2 hours 5 minutes before

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The office that day

Everything else NWS Wakefield, VA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 25, 8:01 PM EDT	Flash Flood Watch	AKQ	Accomack, Charles City, Gloucester, Greensville, James City, Lancaster and 18 more	4 hr
Aug 25, 8:05 PM EDT	Special Weather Statement	AKQ	Prince Edward	55 min
Aug 25, 9:46 PM EDT	Special Weather Statement	AKQ	City of Chesapeake, City of Suffolk, City of Virginia Beach	59 min
Aug 26, 5:27 AM EDT	Tropical Storm Warning	AKQ	Accomack, Brunswick, Caroline, Charles City, Dinwiddie, Gloucester and 21 more	57 hr
Aug 26, 5:40 PM EDT	Special Weather Statement	AKQ	Amelia, Cumberland, Goochland, Nottoway, Powhatan, Prince Edward	35 min
Aug 26, 6:20 PM EDT	Special Weather Statement	AKQ	Cumberland, Goochland, Powhatan, Prince Edward	40 min
Aug 26, 6:39 PM EDT	Special Weather Statement	AKQ	Louisa	36 min
Aug 26, 7:01 PM EDT	Special Weather Statement	AKQ	Cumberland, Goochland, Prince Edward	29 min
Aug 26, 5:50 PM EDT	Special Weather Statement	AKQ	Bertie, Chowan, Gates, Hertford	25 min

Nearby

Flood Watches in Virginia, 2011 Flood Watches in North Carolina, 2011 Flood Watches in Maryland, 2011 Every flood watch 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.