Alert archive / Virginia / Flash Flood Watches in 2013

Flash Flood Watch 6, NWS Blacksburg, VA

June 18, 201318 counties in Virginia

NWS Blacksburg, VA issued this flash flood watch at Jun 18, 2013, 10:40 AM EDT for 18 counties in Virginia. It was in force for 7 hr.

The area

The counties it named.

The facts

Issued: Jun 18, 2013, 10:40 AM EDT (14:40 UTC)
Expired: Jun 18, 2013, 6:00 PM EDT
In force: 7 hr
Issued by: NWS Blacksburg, VA
Flood severity: None

Counties Alleghany County, VA, Amherst County, VA, Appomattox County, VA, Bath County, VA, Bedford County, VA, Botetourt County, VA, Buckingham County, VA, Campbell County, VA, City of Buena Vista, VA, City of Covington, VA, City of Lexington, VA, City of Lynchburg, VA, City of Roanoke, VA, City of Salem, VA, Craig County, VA, Franklin County, VA, Roanoke County, VA, Rockbridge County, VA

The radar

The Roanoke radar (KFCX), 83 km from the middle of the area, began a volume at 14:41 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

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 2.7 hours before the alert went out and 162 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: 453 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 536 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 65 m²/s²
0-3 km storm-relative helicity: 120 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 Blacksburg, VA wrote its last area forecast discussion before this flash flood watch went out at Jun 18, 10:40 AM EDT, 0 minutes earlier.

Area forecast discussion, Jun 18, 10:40 AM EDT, 0 minutes before

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Hazardous weather outlook, Jun 18, 4:28 AM EDT, 6 hours 12 minutes before

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In the hours before

Special weather statement, Jun 18, 6:27 AM EDT, 4 hours 13 minutes before

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Special weather statement, Jun 18, 7:54 AM EDT, 2 hours 46 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
Jun 17, 9:03 PM EDT	Special Weather Statement	RNK	Smyth	27 min
Jun 17, 11:48 PM EDT	Special Weather Statement	RNK	Rockbridge	42 min
Jun 18, 1:00 AM EDT	Special Weather Statement	RNK	Alleghany, Bath, City of Covington	60 min
Jun 18, 1:58 AM EDT	Flash Flood Warning	RNK	Bath	3 hr
Jun 18, 3:06 AM EDT	Areal Flood Advisory	RNK	Alleghany	114 min
Jun 18, 6:27 AM EDT	Special Weather Statement	RNK	Smyth	63 min
Jun 18, 7:54 AM EDT	Special Weather Statement	RNK	Pulaski	51 min
Jun 18, 2:42 PM EDT	Areal Flood Advisory	RNK	Carroll, Floyd, Grayson, City of Galax	3 hr
Jun 18, 2:47 PM EDT	Special Weather Statement	RNK	Patrick	28 min
Jun 18, 3:15 PM EDT	Special Weather Statement	RNK	Henry, Pittsylvania, City of Martinsville	30 min
Jun 18, 3:48 PM EDT	Special Weather Statement	RNK	Pittsylvania	27 min
Jun 18, 4:17 PM EDT	Special Weather Statement	RNK	Pittsylvania, City of Danville	28 min
Jun 18, 4:19 PM EDT	Special Weather Statement	RNK	City of Danville	26 min
Jun 18, 4:27 PM EDT	Areal Flood Advisory	RNK	Pittsylvania, City of Danville	3 hr
Jun 18, 4:46 PM EDT	Areal Flood Advisory	RNK	Halifax	3 hr
Jun 18, 4:50 PM EDT	Special Weather Statement	RNK	Halifax	25 min
Jun 18, 3:17 PM EDT	Special Weather Statement	RNK	Rockingham	28 min
Jun 18, 3:47 PM EDT	Special Weather Statement	RNK	Stokes	28 min
Jun 18, 3:50 PM EDT	Special Weather Statement	RNK	Caswell, Rockingham	25 min
Jun 18, 4:15 PM EDT	Special Weather Statement	RNK	Rockingham	30 min
Jun 18, 4:49 PM EDT	Special Weather Statement	RNK	Caswell	26 min
Jun 18, 5:13 PM EDT	Special Weather Statement	RNK	Caswell	32 min
Jun 18, 12:14 AM EDT	Special Weather Statement	RNK	Monroe	46 min
Jun 18, 1:27 AM EDT	Special Weather Statement	RNK	Greenbrier	63 min
Jun 18, 6:18 AM EDT	Areal Flood Advisory	RNK	Greenbrier, Monroe, Summers	3 hr

Nearby

Flash Flood Watches in Virginia, 2013 Every flash flood watch in 2013

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.