Alert archive / Virginia / Flood Watches in 2011

Flood Watch 4, NWS Wakefield, VA

September 5, 20119 counties in Virginia

NWS Wakefield, VA issued this flood watch at Sep 5, 2011, 2:35 PM EDT for 9 counties in Virginia. It took effect at Sep 6, 2011, 12:00 AM EDT. It was in force for 28 hr.

The area

The counties it named.

The facts

Issued: Sep 5, 2011, 2:35 PM EDT (18:35 UTC)
In effect from: Sep 6, 2011, 12:00 AM EDT
Expired: Sep 7, 2011, 4:22 AM EDT
In force: 28 hr
Issued by: NWS Wakefield, VA
Flood severity: None

Counties Amelia County, VA, Cumberland County, VA, Fluvanna County, VA, Goochland County, VA, Lunenburg County, VA, Mecklenburg County, VA, Nottoway County, VA, Powhatan County, VA, Prince Edward County, VA

The radar

The Norfolk radar (KAKQ), 109 km from the middle of the area, began a volume at 18:34 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, 6.6 hours before the alert went out and 192 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: 248 J/kg
Mixed-layer CIN: -63 J/kg
Mixed-layer LCL: 614 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 15 m²/s²
0-3 km storm-relative helicity: 67 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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 Sep 5, 1:51 PM EDT, 44 minutes earlier.

Area forecast discussion, Sep 5, 1:51 PM EDT, 44 minutes before

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Hazardous weather outlook, Sep 5, 7:20 AM EDT, 7 hours 15 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
Sep 5, 5:10 AM EDT	Rip Current Statement	AKQ	Accomack, Northampton, City of Virginia Beach	5 days
Sep 5, 7:40 PM EDT	Special Weather Statement	AKQ	Prince Edward	50 min

Nearby

Flood Watches in Virginia, 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.