Alert archive / Virginia / Flood Watches in 2011

Flood Watch 6, NWS Blacksburg, VA

December 7, 201115 counties in Virginia; Monroe County, West Virginia

NWS Blacksburg, VA issued this flood watch at Dec 7, 2011, 4:06 AM EST for 15 counties in Virginia; Monroe County, West Virginia. It was in force for 15 hr.

The area

The counties it named.

The facts

Issued: Dec 7, 2011, 4:06 AM EST (09:06 UTC)
Expired: Dec 7, 2011, 7:00 PM EST
In force: 15 hr
Issued by: NWS Blacksburg, VA
Flood severity: None

Counties Alleghany County, VA, Amherst County, VA, Bath County, VA, Bedford County, VA, Botetourt County, VA, City of Buena Vista, VA, City of Covington, VA, City of Lexington, VA, City of Roanoke, VA, City of Salem, VA, Craig County, VA, Giles County, VA, Montgomery County, VA, Roanoke County, VA, Rockbridge County, VA, Monroe County, WV

The radar

The Roanoke radar (KFCX), 67 km from the middle of the area, began a volume at 09:08 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, 9.1 hours before the alert went out and 268 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: 25 J/kg
Mixed-layer CIN: -38 J/kg
Mixed-layer LCL: 477 m above ground
0-6 km bulk shear: 71 kt
0-1 km storm-relative helicity: 199 m²/s²
0-3 km storm-relative helicity: 237 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 flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Blacksburg, VA wrote its last area forecast discussion before this flood watch went out at Dec 6, 11:57 PM EST, 4 hours 9 minutes earlier.

Area forecast discussion, Dec 6, 11:57 PM EST, 4 hours 9 minutes before

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Hazardous weather outlook, Dec 6, 4:17 PM EST, 11 hours 49 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 7, 4:47 AM EST	Special Weather Statement	RNK	Alleghany, Amherst, Bath, Bedford, Bland, Botetourt and 18 more	88 min
Dec 7, 5:20 AM EST	Areal Flood Warning	RNK	Amherst	6 hr
Dec 7, 5:31 AM EST	Areal Flood Warning	RNK	Carroll, Floyd, Patrick	6 hr
Dec 7, 6:32 AM EST	Special Weather Statement	RNK	Alleghany, Bath, Bland, Botetourt, Carroll, Craig and 11 more	73 min
Dec 7, 2:25 PM EST	High Wind Warning	RNK	Carroll, Floyd, Grayson, City of Galax	11 hr
Dec 7, 2:25 PM EST	Wind Advisory	RNK	Alleghany, Amherst, Bath, Bedford, Bland, Botetourt and 17 more	11 hr
Dec 7, 3:37 PM EST	Special Weather Statement	RNK	Franklin, Henry, Patrick	38 min
Dec 7, 4:04 PM EST	Areal Flood Advisory	RNK	Floyd, Montgomery, Pulaski, Roanoke, City of Radford, City of Roanoke and 1 more	3 hr
Dec 7, 4:04 PM EST	Special Weather Statement	RNK	Henry, Pittsylvania, City of Martinsville	41 min
Dec 7, 4:43 PM EST	Special Weather Statement	RNK	Halifax, Pittsylvania, City of Danville	47 min
Dec 7, 5:03 PM EST	Areal Flood Advisory	RNK	Alleghany, Bath, Botetourt, Craig, Rockbridge, City of Buena Vista and 2 more	4 hr
Dec 7, 5:24 PM EST	Special Weather Statement	RNK	Charlotte, Halifax	51 min
Dec 7, 5:38 PM EST	Severe Thunderstorm Warning	RNK	Appomattox, Buckingham, Charlotte, Halifax	37 min
Dec 7, 6:59 PM EST	Areal Flood Warning	RNK	Franklin, Roanoke, City of Roanoke, City of Salem	4 hr

Nearby

Flood Watches in Virginia, 2011 Flood Watches in West 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.