Alert archive / Virginia / Flash Flood Watches in 2015

Flash Flood Watch 1, NWS Blacksburg, VA

June 19, 201519 counties in Virginia; 4 counties in West Virginia

NWS Blacksburg, VA issued this flash flood watch at Jun 19, 2015, 3:26 PM EDT for 19 counties in Virginia; 4 counties in West Virginia. It took effect at Jun 20, 2015, 12:00 PM EDT. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued: Jun 19, 2015, 3:26 PM EDT (19:26 UTC)
In effect from: Jun 20, 2015, 12:00 PM EDT
Expired: Jun 20, 2015, 8:41 PM EDT
In force: 9 hr
Issued by: NWS Blacksburg, VA
Flood severity: None

All 23 counties

Alleghany County, VA, Bath County, VA, Bland County, VA, Botetourt County, VA, City of Buena Vista, VA, City of Covington, VA, City of Lexington, VA, City of Radford, VA, City of Roanoke, VA, City of Salem, VA, Craig County, VA, Giles County, VA, Montgomery County, VA, Pulaski County, VA, Roanoke County, VA, Rockbridge County, VA, Smyth County, VA, Tazewell County, VA, Wythe County, VA, Greenbrier County, WV, Mercer County, WV, Monroe County, WV, Summers County, WV

The radar

The Roanoke radar (KFCX), 47 km from the middle of the area, began a volume at 19:26 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, 7.4 hours before the alert went out and 82 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: 1398 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 26 m²/s²
0-3 km storm-relative helicity: 75 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 19, 1:59 PM EDT, 1 hour 27 minutes earlier.

Area forecast discussion, Jun 19, 1:59 PM EDT, 1 hour 27 minutes before

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Hazardous weather outlook, Jun 19, 4:41 AM EDT, 10 hours 45 minutes before

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In the hours before

Local storm report, Jun 19, 11:47 AM EDT, 3 hours 39 minutes before

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Special weather statement, Jun 19, 1:16 PM EDT, 2 hours 10 minutes before

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Special weather statement, Jun 19, 2:18 PM EDT, 1 hour 8 minutes before

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Special weather statement, Jun 19, 2:54 PM EDT, 32 minutes before

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Special weather statement, Jun 19, 3:12 PM EDT, 14 minutes before

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Special weather statement, Jun 19, 3:18 PM EDT, 8 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 18, 8:36 PM EDT	Special Weather Statement	RNK	Smyth, Wythe	54 min
Jun 18, 9:42 PM EDT	Special Weather Statement	RNK	Carroll, Grayson, City of Galax	63 min
Jun 18, 10:28 PM EDT	Severe Thunderstorm Warning	RNK	Carroll	37 min
Jun 18, 11:52 PM EDT	Special Weather Statement	RNK	Henry, City of Martinsville	53 min
Jun 19, 12:31 AM EDT	Special Weather Statement	RNK	Grayson, Smyth	59 min
Jun 19, 1:27 AM EDT	Special Weather Statement	RNK	Pulaski, Wythe	63 min
Jun 19, 3:18 PM EDT	Special Weather Statement	RNK	Smyth	57 min
Jun 19, 3:54 PM EDT	Special Weather Statement	RNK	Pulaski, City of Radford	66 min
Jun 19, 4:01 PM EDT	Special Weather Statement	RNK	Carroll, Patrick	59 min
Jun 19, 5:02 PM EDT	Special Weather Statement	RNK	Franklin	58 min
Jun 19, 5:09 PM EDT	Special Weather Statement	RNK	Floyd	66 min
Jun 19, 5:29 PM EDT	Severe Thunderstorm Warning	RNK	Franklin, Patrick, Pittsylvania	61 min
Jun 19, 5:44 PM EDT	Flash Flood Warning	RNK	Franklin, Henry	4 hr
Jun 19, 6:04 PM EDT	Severe Thunderstorm Warning	RNK	Halifax, Pittsylvania	56 min
Jun 19, 6:26 PM EDT	Special Weather Statement	RNK	Pittsylvania	64 min
Jun 19, 7:16 PM EDT	Special Weather Statement	RNK	Halifax	59 min
Jun 19, 1:16 PM EDT	Special Weather Statement	RNK	Wilkes	59 min
Jun 19, 2:18 PM EDT	Special Weather Statement	RNK	Surry, Wilkes	57 min
Jun 19, 2:54 PM EDT	Special Weather Statement	RNK	Yadkin	66 min
Jun 19, 3:12 PM EDT	Special Weather Statement	RNK	Alleghany	63 min
Jun 19, 3:29 PM EDT	Special Weather Statement	RNK	Stokes, Surry	61 min
Jun 19, 4:20 PM EDT	Special Weather Statement	RNK	Stokes	55 min
Jun 19, 7:28 PM EDT	Special Weather Statement	RNK	Caswell	62 min

Nearby

Flash Flood Watches in Virginia, 2015 Flash Flood Watches in West Virginia, 2015 Every flash flood watch in 2015

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.