Alert archive / North Carolina / Flash Flood Watches in 2017

Flash Flood Watch 3, NWS Wakefield, VA

August 11, 20178 counties in Virginia; 9 counties in North Carolina

NWS Wakefield, VA issued this flash flood watch at Aug 11, 2017, 8:38 PM EDT for 8 counties in Virginia; 9 counties in North Carolina. It took effect at Aug 12, 2017, 6:00 AM EDT. It was in force for 14 hr.

The area

The counties it named.

The facts

Issued: Aug 11, 2017, 8:38 PM EDT (00:38 UTC)
In effect from: Aug 12, 2017, 6:00 AM EDT
Expired: Aug 12, 2017, 7:48 PM EDT
In force: 14 hr
Issued by: NWS Wakefield, VA
Flood severity: None

Counties 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, City of Chesapeake, VA, City of Franklin, VA, City of Hampton, VA, City of Newport News, VA, City of Poquoson, VA, City of Virginia Beach, VA, Southampton County, VA, York County, VA

The radar

The Norfolk radar (KAKQ), 60 km from the middle of the area, began a volume at 00:41 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

Wallops Is Stn, VA (KWAL), launched 00:00Z, 0.6 hours before the alert went out and 182 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: 50 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 692 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 68 m²/s²
0-3 km storm-relative helicity: 126 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 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 flash flood watch went out at Aug 11, 7:53 PM EDT, 45 minutes earlier.

Area forecast discussion, Aug 11, 7:53 PM EDT, 45 minutes before

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Hazardous weather outlook, Aug 11, 3:41 PM EDT, 4 hours 57 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 12, 6:33 AM EDT	Special Weather Statement	AKQ	Amelia, Brunswick, Charles City, Chesterfield, Dinwiddie, Greensville and 16 more	72 min
Aug 12, 7:45 AM EDT	Areal Flood Advisory	AKQ	Accomack	3 hr
Aug 12, 7:53 AM EDT	Special Weather Statement	AKQ	Charles City, Gloucester, Greensville, Henrico, Isle of Wight, James City and 20 more	52 min
Aug 12, 8:33 AM EDT	Special Weather Statement	AKQ	Isle of Wight, Southampton, City of Chesapeake, City of Franklin, City of Hampton, City of Newport News and 5 more	57 min
Aug 12, 9:31 AM EDT	Areal Flood Advisory	AKQ	Isle of Wight, City of Chesapeake, City of Newport News, City of Norfolk, City of Portsmouth, City of Suffolk and 1 more	119 min
Aug 12, 11:29 AM EDT	Areal Flood Advisory	AKQ	City of Chesapeake, City of Norfolk, City of Virginia Beach	61 min
Aug 12, 3:14 PM EDT	Special Weather Statement	AKQ	Chowan	61 min
Aug 12, 3:42 PM EDT	Special Weather Statement	AKQ	Camden, Pasquotank	63 min
Aug 12, 4:45 PM EDT	Special Weather Statement	AKQ	Camden, Currituck	45 min
Aug 12, 5:03 PM EDT	Areal Flood Advisory	AKQ	Camden, Currituck, Pasquotank	117 min
Aug 11, 11:34 PM EDT	Special Weather Statement	AKQ	Dorchester	41 min
Aug 11, 11:37 PM EDT	Tornado Warning	AKQ	Dorchester	38 min
Aug 12, 12:12 AM EDT	Special Weather Statement	AKQ	Dorchester	48 min
Aug 12, 12:58 AM EDT	Special Weather Statement	AKQ	Dorchester	47 min
Aug 12, 2:06 AM EDT	Areal Flood Advisory	AKQ	Dorchester, Somerset, Wicomico, Worcester	3 hr
Aug 12, 6:27 AM EDT	Special Weather Statement	AKQ	Somerset, Worcester	78 min
Aug 12, 8:04 AM EDT	Areal Flood Advisory	AKQ	Wicomico, Worcester	3 hr
Aug 12, 9:08 AM EDT	Flash Flood Warning	AKQ	Wicomico, Worcester	3 hr
Aug 12, 11:59 AM EDT	Areal Flood Warning	AKQ	Wicomico, Worcester	9 hr

Nearby

Flash Flood Watches in North Carolina, 2017 Flash Flood Watches in Virginia, 2017 Every flash flood watch in 2017

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.