Alert archive / Virginia / Flash Flood Watches in 2013

Flash Flood Watch 1, NWS Blacksburg, VA

January 30, 201334 counties in Virginia; 9 counties in North Carolina; Mercer County, Monroe County, Summers County, West Virginia

NWS Blacksburg, VA issued this flash flood watch at Jan 30, 2013, 4:24 AM EST for 34 counties in Virginia; 9 counties in North Carolina; Mercer County, Monroe County, Summers County, West Virginia. It took effect at Jan 30, 2013, 12:00 PM EST. It was in force for 14 hr.

The area

The counties it named.

The facts

Issued: Jan 30, 2013, 4:24 AM EST (09:24 UTC)
In effect from: Jan 30, 2013, 12:00 PM EST
Expired: Jan 31, 2013, 1:41 AM EST
In force: 14 hr
Issued by: NWS Blacksburg, VA
Flood severity: None

All 46 counties

Alleghany County, NC, Ashe County, NC, Caswell County, NC, Rockingham County, NC, Stokes County, NC, Surry County, NC, Watauga County, NC, Wilkes County, NC, Yadkin County, NC, Alleghany County, VA, Amherst County, VA, Bath County, VA, Bedford County, VA, Bland County, VA, Botetourt County, VA, Campbell County, VA, Carroll County, VA, City of Buena Vista, VA, City of Covington, VA, City of Danville, VA, City of Galax, VA, City of Lexington, VA, City of Lynchburg, VA, City of Martinsville, VA, City of Radford, VA, City of Roanoke, VA, City of Salem, VA, Craig County, VA, Floyd County, VA, Franklin County, VA, Giles County, VA, Grayson County, VA, Halifax County, VA, Henry County, VA, Montgomery County, VA, Patrick County, VA, Pittsylvania County, VA, Pulaski County, VA, Roanoke County, VA, Rockbridge County, VA, Smyth County, VA, Tazewell County, VA, Wythe County, VA, Mercer County, WV, Monroe County, WV, Summers County, WV

The radar

The Roanoke radar (KFCX), 2 km from the middle of the area, began a volume at 09:21 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 00:00Z, 9.4 hours before the alert went out and 112 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1135 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 185 m²/s²
0-3 km storm-relative helicity: 147 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 Jan 29, 11:46 PM EST, 4 hours 38 minutes earlier.

Area forecast discussion, Jan 29, 11:46 PM EST, 4 hours 38 minutes before

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Hazardous weather outlook, Jan 29, 10:13 PM EST, 6 hours 11 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
Jan 30, 10:07 AM EST	Special Weather Statement	RNK	Bland, Smyth, Tazewell, Wythe	53 min
Jan 30, 10:30 AM EST	Special Weather Statement	RNK	Smyth, Tazewell	30 min
Jan 30, 11:12 AM EST	Special Weather Statement	RNK	Bland, Smyth, Tazewell	63 min
Jan 30, 12:13 PM EST	Special Weather Statement	RNK	Giles	47 min
Jan 30, 12:58 PM EST	Special Weather Statement	RNK	Alleghany, Bath, Bland, Craig, Giles, Pulaski and 3 more	62 min
Jan 30, 1:51 PM EST	Special Weather Statement	RNK	Alleghany, Bath, City of Covington	54 min
Jan 30, 2:31 PM EST	Special Weather Statement	RNK	Smyth	59 min
Jan 30, 2:59 PM EST	Severe Thunderstorm Warning	RNK	Grayson, Smyth, Wythe	61 min
Jan 30, 3:22 PM EST	Special Weather Statement	RNK	Floyd, Montgomery, Pulaski, Wythe, City of Radford	53 min
Jan 30, 3:27 PM EST	Severe Thunderstorm Warning	RNK	Bland, Carroll, Floyd, Giles, Grayson, Montgomery and 5 more	63 min
Jan 30, 3:31 PM EST	Areal Flood Advisory	RNK	Bland, Smyth, Tazewell, Wythe	6 hr
Jan 30, 3:56 PM EST	Areal Flood Advisory	RNK	Carroll, Grayson, City of Galax	6 hr
Jan 30, 4:02 PM EST	Severe Thunderstorm Warning	RNK	Alleghany, Bedford, Botetourt, Craig, Franklin, Giles and 4 more	58 min
Jan 30, 4:19 PM EST	Flash Flood Warning Emergency	RNK	Grayson	10 hr
Jan 30, 4:52 PM EST	Severe Thunderstorm Warning	RNK	Alleghany, Amherst, Bedford, Botetourt, Roanoke, Rockbridge and 4 more	53 min
Jan 30, 4:57 PM EST	Areal Flood Advisory	RNK	Alleghany, Bath, Bedford, Botetourt, Craig, Floyd and 8 more	6 hr
Jan 30, 5:02 PM EST	Areal Flood Advisory	RNK	Carroll, Floyd, Franklin, Grayson, Montgomery, Patrick and 3 more	6 hr
Jan 30, 5:34 PM EST	Areal Flood Warning	RNK	Bland, Carroll, Craig, Floyd, Giles, Grayson and 6 more	18 hr
Jan 30, 5:48 PM EST	Severe Thunderstorm Warning	RNK	Amherst, Appomattox, City of Lynchburg	42 min
Jan 30, 6:19 PM EST	Areal Flood Warning	RNK	Alleghany, Bath	6 hr
Jan 30, 6:23 PM EST	Special Weather Statement	RNK	Bedford, Campbell, Henry, Pittsylvania, City of Martinsville	52 min
Jan 30, 6:25 PM EST	Flash Flood Warning	RNK	Carroll, Floyd, Franklin, Grayson, Montgomery, Patrick and 2 more	6 hr
Jan 30, 6:32 PM EST	Special Weather Statement	RNK	Buckingham	58 min
Jan 30, 6:39 PM EST	Flash Flood Warning	RNK	Alleghany, Amherst, Bath, Bedford, Botetourt, Craig and 8 more	6 hr

Nearby

Flash Flood Watches in Virginia, 2013 Flash Flood Watches in North Carolina, 2013 Flash Flood Watches in West 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.