Alert archive / Virginia / Flash Flood Watches in 2010

Flash Flood Watch 13, NWS Blacksburg, VA

July 27, 20107 counties in Virginia; 6 counties in North Carolina; Mercer County, West Virginia

NWS Blacksburg, VA issued this flash flood watch at Jul 27, 2010, 10:03 AM EDT for 7 counties in Virginia; 6 counties in North Carolina; Mercer County, West Virginia. It was in force for 18 hr.

The area

The counties it named.

The facts

Issued: Jul 27, 2010, 10:03 AM EDT (14:03 UTC)
Expired: Jul 28, 2010, 4:00 AM EDT
In force: 18 hr
Issued by: NWS Blacksburg, VA
Flood severity: None

Counties Alleghany County, NC, Ashe County, NC, Surry County, NC, Watauga County, NC, Wilkes County, NC, Yadkin County, NC, Bland County, VA, Carroll County, VA, City of Galax, VA, Grayson County, VA, Smyth County, VA, Tazewell County, VA, Wythe County, VA, Mercer County, WV

The radar

The Roanoke radar (KFCX), 87 km from the middle of the area, began a volume at 14:05 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, 2.1 hours before the alert went out and 130 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: 1083 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 687 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 99 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 Jul 27, 8:42 AM EDT, 1 hour 21 minutes earlier.

Area forecast discussion, Jul 27, 8:42 AM EDT, 1 hour 21 minutes before

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Hazardous weather outlook, Jul 27, 5:31 AM EDT, 4 hours 32 minutes before

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In the hours before

Special weather statement, Jul 27, 8:38 AM EDT, 1 hour 25 minutes before

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Special weather statement, Jul 27, 8:40 AM EDT, 1 hour 23 minutes before

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Local storm report, Jul 27, 9:11 AM EDT, 52 minutes before

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Special weather statement, Jul 27, 9:31 AM EDT, 32 minutes before

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Special weather statement, Jul 27, 9:51 AM EDT, 12 minutes before

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Special weather statement, Jul 27, 9:53 AM EDT, 10 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
Jul 26, 8:54 PM EDT	Special Weather Statement	RNK	City of Galax	66 min
Jul 26, 9:07 PM EDT	Severe Thunderstorm Warning	RNK	Carroll	68 min
Jul 26, 9:28 PM EDT	Flash Flood Warning	RNK	Carroll, Grayson, Patrick, City of Galax	117 min
Jul 26, 10:35 PM EDT	Special Weather Statement	RNK	Bedford	55 min
Jul 27, 8:38 AM EDT	Special Weather Statement	RNK	Pittsylvania	67 min
Jul 27, 8:40 AM EDT	Special Weather Statement	RNK	Appomattox, Buckingham	65 min
Jul 27, 9:31 AM EDT	Special Weather Statement	RNK	Bland, Giles, Pulaski, City of Radford	59 min
Jul 27, 9:51 AM EDT	Special Weather Statement	RNK	Appomattox, Charlotte	54 min
Jul 27, 9:53 AM EDT	Special Weather Statement	RNK	Smyth, Wythe	67 min
Jul 27, 10:49 AM EDT	Special Weather Statement	RNK	Wythe	56 min
Jul 27, 11:23 AM EDT	Special Weather Statement	RNK	Tazewell	52 min
Jul 27, 11:44 AM EDT	Special Weather Statement	RNK	Henry, Patrick, City of Martinsville	61 min
Jul 27, 12:44 PM EDT	Special Weather Statement	RNK	Henry, City of Martinsville	61 min
Jul 26, 8:38 PM EDT	Special Weather Statement	RNK	Yadkin	67 min
Jul 26, 9:41 PM EDT	Tornado Warning	RNK	Surry	49 min
Jul 26, 11:08 PM EDT	Special Weather Statement	RNK	Wilkes	37 min
Jul 26, 11:21 PM EDT	Special Weather Statement	RNK	Yadkin	39 min
Jul 27, 12:03 AM EDT	Special Weather Statement	RNK	Wilkes	42 min
Jul 27, 12:22 AM EDT	Special Weather Statement	RNK	Stokes	53 min
Jul 27, 11:40 AM EDT	Special Weather Statement	RNK	Surry	65 min
Jul 27, 1:26 PM EDT	Special Weather Statement	RNK	Yadkin	64 min
Jul 27, 1:59 PM EDT	Flash Flood Warning	RNK	Rockingham	2 hr
Jul 27, 5:25 PM EDT	Special Weather Statement	RNK	Alleghany, Ashe, Surry, Wilkes	65 min
Jul 27, 7:07 PM EDT	Special Weather Statement	RNK	Yadkin	53 min
Jul 27, 8:36 AM EDT	Special Weather Statement	RNK	Mercer	54 min
Jul 27, 6:36 PM EDT	Special Weather Statement	RNK	Greenbrier	54 min

Nearby

Flash Flood Watches in Virginia, 2010 Flash Flood Watches in North Carolina, 2010 Flash Flood Watches in West Virginia, 2010 Every flash flood watch in 2010

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.