Alert archive / Virginia / Flash Flood Watches in 2020

Flash Flood Watch 7, NWS Blacksburg, VA

June 20, 202034 counties in Virginia; 7 counties in North Carolina; 4 counties in West Virginia

NWS Blacksburg, VA issued this flash flood watch at Jun 20, 2020, 12:47 PM EDT for 34 counties in Virginia; 7 counties in North Carolina; 4 counties in West Virginia. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: Jun 20, 2020, 12:47 PM EDT (16:47 UTC)
Expired: Jun 20, 2020, 9:00 PM EDT
In force: 8 hr
Issued by: NWS Blacksburg, VA
Flood severity: None

All 45 counties

Alleghany County, NC, Caswell County, NC, Rockingham County, NC, Stokes County, NC, Surry County, NC, Wilkes County, NC, Yadkin County, NC, Alleghany County, VA, Amherst County, VA, Appomattox County, VA, Bath County, VA, Bedford County, VA, Bland County, VA, Botetourt County, VA, Campbell County, VA, Carroll County, VA, Charlotte 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, Wythe County, VA, Greenbrier County, WV, Mercer County, WV, Monroe County, WV, Summers County, WV

The radar

The Roanoke radar (KFCX), 19 km from the middle of the area, began a volume at 16:50 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, 4.8 hours before the alert went out and 53 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: 4 J/kg
Mixed-layer CIN: -135 J/kg
Mixed-layer LCL: 820 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 50 m²/s²
0-3 km storm-relative helicity: 35 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 20, 10:55 AM EDT, 1 hour 52 minutes earlier.

Area forecast discussion, Jun 20, 10:55 AM EDT, 1 hour 52 minutes before

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Hazardous weather outlook, Jun 20, 3:31 AM EDT, 9 hours 16 minutes before

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In the hours before

Local storm report, Jun 20, 10:35 AM EDT, 2 hours 12 minutes before

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Local storm report, Jun 20, 11:16 AM EDT, 1 hour 31 minutes before

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Special weather statement, Jun 20, 11:33 AM EDT, 1 hour 14 minutes before

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Special weather statement, Jun 20, 11:53 AM EDT, 54 minutes before

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Special weather statement, Jun 20, 11:57 AM EDT, 50 minutes before

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Special weather statement, Jun 20, 12:35 PM EDT, 12 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 20, 11:33 AM EDT	Special Weather Statement	RNK	Carroll, City of Galax	27 min
Jun 20, 12:35 PM EDT	Special Weather Statement	RNK	Patrick	40 min
Jun 20, 12:53 PM EDT	Areal Flood Advisory	RNK	Carroll, Pulaski, Wythe	3 hr
Jun 20, 4:11 PM EDT	Special Weather Statement	RNK	Buckingham	34 min
Jun 20, 4:50 PM EDT	Special Weather Statement	RNK	Bedford	25 min
Jun 20, 5:41 PM EDT	Special Weather Statement	RNK	Bedford	34 min
Jun 20, 6:10 PM EDT	Special Weather Statement	RNK	Bedford	35 min
Jun 20, 7:34 PM EDT	Special Weather Statement	RNK	Campbell	26 min
Jun 20, 7:45 PM EDT	Severe Thunderstorm Warning	RNK	Campbell	30 min
Jun 19, 8:01 PM EDT	Areal Flood Advisory	RNK	Caswell	111 min
Jun 20, 11:53 AM EDT	Special Weather Statement	RNK	Stokes	22 min
Jun 20, 11:57 AM EDT	Special Weather Statement	RNK	Surry	33 min
Jun 20, 12:44 PM EDT	Areal Flood Advisory	RNK	Surry	3 hr
Jun 20, 1:16 PM EDT	Special Weather Statement	RNK	Stokes, Surry, Wilkes, Yadkin	44 min
Jun 20, 1:33 PM EDT	Areal Flood Advisory	RNK	Yadkin	3 hr
Jun 20, 2:44 PM EDT	Special Weather Statement	RNK	Caswell	31 min
Jun 20, 2:51 PM EDT	Special Weather Statement	RNK	Alleghany, Wilkes	39 min
Jun 20, 3:23 PM EDT	Special Weather Statement	RNK	Caswell	37 min

Nearby

Flash Flood Watches in Virginia, 2020 Flash Flood Watches in North Carolina, 2020 Flash Flood Watches in West Virginia, 2020 Every flash flood watch in 2020

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.