Alert archive / Virginia / Flash Flood Watches in 2013

Flash Flood Watch 9, NWS Blacksburg, VA

July 10, 201324 counties in Virginia; 5 counties in North Carolina; Mercer County, Monroe County, Summers County, West Virginia

NWS Blacksburg, VA issued this flash flood watch at Jul 10, 2013, 2:59 PM EDT for 24 counties in Virginia; 5 counties in North Carolina; Mercer County, Monroe County, Summers County, West Virginia. It was in force for 11 hr.

The area

The counties it named.

The facts

Issued: Jul 10, 2013, 2:59 PM EDT (18:59 UTC)
Expired: Jul 11, 2013, 2:00 AM EDT
In force: 11 hr
Issued by: NWS Blacksburg, VA
Flood severity: None

All 32 counties

Alleghany County, NC, Ashe County, NC, Surry County, NC, Watauga County, NC, Wilkes County, NC, Alleghany County, VA, Bath County, VA, Bland County, VA, Botetourt County, VA, Carroll County, VA, City of Buena Vista, VA, City of Covington, VA, City of Galax, VA, City of Lexington, VA, City of Radford, VA, City of Roanoke, VA, City of Salem, VA, Craig County, VA, Floyd County, VA, Giles County, VA, Grayson County, VA, Montgomery County, VA, Patrick 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), 29 km from the middle of the area, began a volume at 19:01 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

Roanoke, VA (KRNK), launched 12:00Z, 7.0 hours before the alert went out and 94 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: 587 J/kg
Mixed-layer CIN: -57 J/kg
Mixed-layer LCL: 953 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: -11 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 10, 1:50 PM EDT, 1 hour 9 minutes earlier.

Area forecast discussion, Jul 10, 1:50 PM EDT, 1 hour 9 minutes before

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Hazardous weather outlook, Jul 10, 9:12 AM EDT, 5 hours 47 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BLACKSBURG VA
912 AM EDT WED JUL 10 2013

NCZ001>006-018>020-VAZ007-009>020-022>024-032>035-043>047-058-059-
WVZ042>045-111315-
ASHE-ALLEGHANY NC-SURRY-STOKES-ROCKINGHAM-CASWELL-WATAUGA-WILKES-
YADKIN-TAZEWELL-SMYTH-BLAND-GILES-WYTHE-PULASKI-MONTGOMERY-GRAYSON-
CARROLL-FLOYD-CRAIG-ALLEGHANY VA-BATH-ROANOKE-BOTETOURT-ROCKBRIDGE-
PATRICK-FRANKLIN-BEDFORD-AMHERST-HENRY-PITTSYLVANIA-CAMPBELL-
APPOMATTOX-BUCKINGHAM-HALIFAX-CHARLOTTE-MERCER-SUMMERS-MONROE-
GREENBRIER-
912 AM EDT WED JUL 10 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL NORTH
CAROLINA...NORTHWEST NORTH CAROLINA...CENTRAL VIRGINIA...SOUTH
CENTRAL VIRGINIA...SOUTHWEST VIRGINIA...WEST CENTRAL VIRGINIA AND
SOUTHEAST WEST VIRGINIA.

.DAY ONE...TODAY AND TONIGHT.

A FEW SEVERE THUNDERSTORMS ARE POSSIBLE THIS AFTERNOON AND
TONIGHT. THE MAIN THREAT WILL BE DAMAGING DOWNBURST WINDS.
LOCALIZED FLOODING AND FLASH FLOODING WILL ALSO BE POSSIBLE WITH
THE STRONGER STORMS...ESPECIALLY ACROSS THE MOUNTAINOUS TERRAIN OF
SOUTHEAST WEST VIRGINIA...WESTERN VIRGINIA AND NORTHWEST NORTH
CAROLINA.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.

ISOLATED STRONG TO SEVERE THUNDERSTORMS ARE POSSIBLE THURSDAY...MAINLY
ACROSS THE PIEDMONT AREA OF SOUTH CENTRAL VIRGINIA AND NORTH CENTRAL
NORTH CAROLINA. HEAVY RAIN WILL BE POSSIBLE THURSDAY...WITH
LOCALIZED FLOODING OR FLASH FLOODING POSSIBLE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

In the hours before

Special weather statement, Jul 10, 2:38 PM EDT, 21 minutes before

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Special weather statement, Jul 10, 2:43 PM EDT, 16 minutes before

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Special weather statement, Jul 10, 2:47 PM EDT, 12 minutes before

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Special weather statement, Jul 10, 2:53 PM EDT, 6 minutes before

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Special weather statement, Jul 10, 2:56 PM EDT, 3 minutes before

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Special weather statement, Jul 10, 2:58 PM EDT, 1 minute 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 9, 8:15 PM EDT	Special Weather Statement	RNK	City of Danville	30 min
Jul 9, 9:14 PM EDT	Special Weather Statement	RNK	City of Danville	31 min
Jul 9, 9:15 PM EDT	Special Weather Statement	RNK	Halifax	30 min
Jul 9, 9:33 PM EDT	Special Weather Statement	RNK	Halifax	42 min
Jul 10, 1:01 PM EDT	Special Weather Statement	RNK	Bath	59 min
Jul 10, 1:20 PM EDT	Special Weather Statement	RNK	Alleghany, City of Covington	55 min
Jul 10, 1:57 PM EDT	Special Weather Statement	RNK	Alleghany, Botetourt, Rockbridge, City of Covington, City of Lexington	63 min
Jul 10, 2:20 PM EDT	Areal Flood Advisory	RNK	Botetourt, Craig	3 hr
Jul 10, 2:27 PM EDT	Special Weather Statement	RNK	Floyd	33 min
Jul 10, 2:29 PM EDT	Special Weather Statement	RNK	City of Buena Vista	31 min
Jul 10, 2:37 PM EDT	Special Weather Statement	RNK	Floyd	23 min
Jul 10, 2:43 PM EDT	Special Weather Statement	RNK	Tazewell	32 min
Jul 10, 2:47 PM EDT	Special Weather Statement	RNK	Wythe	28 min
Jul 10, 2:53 PM EDT	Special Weather Statement	RNK	City of Roanoke	37 min
Jul 10, 2:56 PM EDT	Special Weather Statement	RNK	Tazewell	34 min
Jul 10, 2:58 PM EDT	Special Weather Statement	RNK	Franklin	32 min
Jul 10, 3:03 PM EDT	Special Weather Statement	RNK	Floyd	27 min
Jul 10, 3:07 PM EDT	Special Weather Statement	RNK	Carroll	38 min
Jul 10, 3:09 PM EDT	Special Weather Statement	RNK	Grayson	36 min
Jul 10, 3:11 PM EDT	Areal Flood Advisory	RNK	Botetourt, Roanoke, City of Roanoke, City of Salem	3 hr
Jul 10, 3:18 PM EDT	Special Weather Statement	RNK	City of Radford	27 min
Jul 10, 3:25 PM EDT	Flash Flood Warning	RNK	Roanoke, City of Roanoke, City of Salem	3 hr
Jul 10, 3:27 PM EDT	Special Weather Statement	RNK	Wythe	33 min
Jul 10, 3:31 PM EDT	Special Weather Statement	RNK	City of Roanoke	29 min
Jul 10, 3:33 PM EDT	Special Weather Statement	RNK	Grayson	27 min
Jul 10, 3:34 PM EDT	Special Weather Statement	RNK	Montgomery	26 min
Jul 10, 3:48 PM EDT	Special Weather Statement	RNK	Buckingham	27 min
Jul 10, 3:50 PM EDT	Special Weather Statement	RNK	Pulaski	25 min
Jul 10, 3:57 PM EDT	Special Weather Statement	RNK	City of Lynchburg	33 min
Jul 10, 4:01 PM EDT	Special Weather Statement	RNK	Buckingham	29 min
Jul 10, 4:04 PM EDT	Special Weather Statement	RNK	Pulaski	26 min
Jul 10, 4:15 PM EDT	Special Weather Statement	RNK	Buckingham	30 min
Jul 10, 4:17 PM EDT	Areal Flood Advisory	RNK	Buckingham	3 hr
Jul 10, 4:22 PM EDT	Special Weather Statement	RNK	Buckingham	23 min
Jul 10, 4:23 PM EDT	Special Weather Statement	RNK	Bedford	37 min
Jul 10, 4:25 PM EDT	Special Weather Statement	RNK	City of Radford	35 min
Jul 10, 4:40 PM EDT	Special Weather Statement	RNK	Montgomery	35 min
Jul 10, 4:43 PM EDT	Areal Flood Advisory	RNK	Wythe	3 hr
Jul 10, 4:50 PM EDT	Special Weather Statement	RNK	Carroll	25 min
Jul 10, 5:03 PM EDT	Special Weather Statement	RNK	Prince Edward	12 min
Jul 10, 5:08 PM EDT	Flash Flood Warning	RNK	Pulaski	6 hr
Jul 10, 5:14 PM EDT	Areal Flood Advisory	RNK	Montgomery, Pulaski, City of Radford	3 hr
Jul 10, 5:45 PM EDT	Special Weather Statement	RNK	City of Lynchburg	30 min
Jul 10, 5:49 PM EDT	Special Weather Statement	RNK	City of Roanoke, City of Salem	26 min
Jul 10, 5:56 PM EDT	Special Weather Statement	RNK	Franklin	34 min
Jul 10, 6:15 PM EDT	Special Weather Statement	RNK	City of Roanoke	45 min
Jul 10, 6:19 PM EDT	Special Weather Statement	RNK	Appomattox	26 min
Jul 10, 6:32 PM EDT	Special Weather Statement	RNK	Franklin	28 min
Jul 10, 6:42 PM EDT	Special Weather Statement	RNK	Halifax	33 min
Jul 10, 6:51 PM EDT	Special Weather Statement	RNK	Appomattox	24 min
Jul 10, 6:54 PM EDT	Flash Flood Warning	RNK	Montgomery, Roanoke	3 hr
Jul 10, 6:59 PM EDT	Special Weather Statement	RNK	Franklin	31 min
Jul 10, 7:18 PM EDT	Special Weather Statement	RNK	Buckingham	27 min
Jul 10, 7:32 PM EDT	Special Weather Statement	RNK	Franklin	28 min
Jul 10, 7:34 PM EDT	Areal Flood Advisory	RNK	Franklin	3 hr
Jul 10, 7:43 PM EDT	Special Weather Statement	RNK	Buckingham	17 min
Jul 10, 7:53 PM EDT	Special Weather Statement	RNK	Smyth	37 min
Jul 9, 8:06 PM EDT	Special Weather Statement	RNK	Caswell	24 min
Jul 9, 8:32 PM EDT	Special Weather Statement	RNK	Caswell	28 min
Jul 9, 8:38 PM EDT	Severe Thunderstorm Warning	RNK	Caswell, Rockingham	52 min
Jul 9, 8:47 PM EDT	Special Weather Statement	RNK	Caswell	28 min
Jul 9, 8:51 PM EDT	Areal Flood Advisory	RNK	Caswell	3 hr
Jul 10, 2:34 PM EDT	Special Weather Statement	RNK	Ashe	26 min
Jul 10, 3:43 PM EDT	Special Weather Statement	RNK	Ashe	32 min
Jul 10, 4:28 PM EDT	Special Weather Statement	RNK	Ashe	32 min
Jul 10, 4:57 PM EDT	Special Weather Statement	RNK	Ashe	33 min
Jul 10, 5:46 PM EDT	Special Weather Statement	RNK	Alleghany	29 min
Jul 10, 6:02 PM EDT	Special Weather Statement	RNK	Ashe	28 min
Jul 10, 6:44 PM EDT	Flash Flood Warning	RNK	Alleghany, Surry	4 hr
Jul 10, 6:50 PM EDT	Special Weather Statement	RNK	Ashe	25 min
Jul 10, 2:31 PM EDT	Special Weather Statement	RNK	Summers	29 min
Jul 10, 2:32 PM EDT	Special Weather Statement	RNK	Summers	28 min
Jul 10, 2:38 PM EDT	Special Weather Statement	RNK	Greenbrier	37 min
Jul 10, 3:22 PM EDT	Special Weather Statement	RNK	Summers	23 min

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.