Alert archive / Virginia / Flash Flood Watches in 2018

Flash Flood Watch 5, NWS Blacksburg, VA

June 22, 20184 counties in Virginia

NWS Blacksburg, VA issued this flash flood watch at Jun 22, 2018, 10:12 AM EDT for 4 counties in Virginia. It took effect at Jun 22, 2018, 4:00 PM EDT. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued: Jun 22, 2018, 10:12 AM EDT (14:12 UTC)
In effect from: Jun 22, 2018, 4:00 PM EDT
Expired: Jun 22, 2018, 10:08 PM EDT
In force: 6 hr
Issued by: NWS Blacksburg, VA
Flood severity: None

Counties Appomattox County, VA, Buckingham County, VA, Charlotte County, VA, Halifax County, VA

The radar

The Roanoke radar (KFCX), 138 km from the middle of the area, began a volume at 14:14 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, 2.2 hours before the alert went out and 68 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: 46 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 640 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: 58 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 22, 7:57 AM EDT, 2 hours 15 minutes earlier.

Area forecast discussion, Jun 22, 7:57 AM EDT, 2 hours 15 minutes before

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Hazardous weather outlook, Jun 22, 4:48 AM EDT, 5 hours 24 minutes before

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In the hours before

Special weather statement, Jun 22, 6:40 AM EDT, 3 hours 32 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 21, 8:56 PM EDT	Special Weather Statement	RNK	Charlotte	34 min
Jun 21, 9:44 PM EDT	Special Weather Statement	RNK	City of Roanoke	31 min
Jun 21, 10:15 PM EDT	Severe Thunderstorm Warning	RNK	Halifax, Pittsylvania, City of Danville	60 min
Jun 21, 10:55 PM EDT	Special Weather Statement	RNK	Amherst, Appomattox, Campbell, City of Buena Vista, City of Lynchburg	65 min
Jun 22, 12:02 AM EDT	Special Weather Statement	RNK	Halifax	28 min
Jun 22, 12:24 PM EDT	Special Weather Statement	RNK	Bland	21 min
Jun 22, 12:45 PM EDT	Special Weather Statement	RNK	Pulaski	15 min
Jun 22, 1:04 PM EDT	Special Weather Statement	RNK	Giles	26 min
Jun 22, 1:35 PM EDT	Special Weather Statement	RNK	City of Radford	25 min
Jun 22, 2:21 PM EDT	Special Weather Statement	RNK	Craig	24 min
Jun 22, 2:35 PM EDT	Special Weather Statement	RNK	Bedford	40 min
Jun 22, 2:57 PM EDT	Special Weather Statement	RNK	Roanoke	33 min
Jun 22, 2:59 PM EDT	Special Weather Statement	RNK	Wythe	31 min
Jun 22, 3:14 PM EDT	Severe Thunderstorm Warning	RNK	Roanoke, City of Roanoke, City of Salem	25 min
Jun 22, 3:16 PM EDT	Special Weather Statement	RNK	Bedford	29 min
Jun 22, 3:38 PM EDT	Severe Thunderstorm Warning	RNK	Amherst, Bedford, Campbell, City of Lynchburg	26 min
Jun 22, 3:41 PM EDT	Special Weather Statement	RNK	Wythe	34 min
Jun 22, 3:51 PM EDT	Tornado Warning	RNK	Amherst, Bedford, Campbell, City of Lynchburg	39 min
Jun 22, 4:14 PM EDT	Special Weather Statement	RNK	Pulaski	46 min
Jun 22, 4:20 PM EDT	Areal Flood Advisory	RNK	City of Lynchburg	5 hr
Jun 22, 4:25 PM EDT	Tornado Warning	RNK	Appomattox, Campbell	35 min
Jun 22, 4:30 PM EDT	Special Weather Statement	RNK	Botetourt	30 min
Jun 22, 4:50 PM EDT	Special Weather Statement	RNK	Charlotte	40 min
Jun 22, 4:51 PM EDT	Special Weather Statement	RNK	Appomattox	39 min
Jun 22, 4:58 PM EDT	Special Weather Statement	RNK	Bedford	32 min
Jun 22, 5:13 PM EDT	Severe Thunderstorm Warning	RNK	Charlotte	33 min
Jun 22, 5:22 PM EDT	Special Weather Statement	RNK	City of Buena Vista	23 min
Jun 22, 5:44 PM EDT	Special Weather Statement	RNK	Franklin, Patrick	46 min
Jun 22, 6:06 PM EDT	Areal Flood Advisory	RNK	Botetourt, Roanoke, City of Roanoke, City of Salem	2 hr
Jun 22, 6:39 PM EDT	Special Weather Statement	RNK	Bedford, City of Roanoke	66 min
Jun 22, 7:09 PM EDT	Severe Thunderstorm Warning	RNK	Alleghany	36 min
Jun 22, 7:17 PM EDT	Special Weather Statement	RNK	Campbell	43 min
Jun 22, 7:47 PM EDT	Special Weather Statement	RNK	Alleghany, City of Covington	28 min
Jun 21, 9:46 PM EDT	Special Weather Statement	RNK	Rockingham	29 min
Jun 21, 11:15 PM EDT	Special Weather Statement	RNK	Caswell, Rockingham	60 min
Jun 22, 2:34 PM EDT	Special Weather Statement	RNK	Ashe	26 min
Jun 22, 3:59 PM EDT	Special Weather Statement	RNK	Wilkes	31 min
Jun 22, 4:46 PM EDT	Special Weather Statement	RNK	Surry	44 min
Jun 22, 7:58 PM EDT	Special Weather Statement	RNK	Wilkes	32 min
Jun 22, 5:34 PM EDT	Special Weather Statement	RNK	Summers	26 min
Jun 22, 5:47 PM EDT	Severe Thunderstorm Warning	RNK	Mercer, Monroe, Summers	40 min
Jun 22, 6:19 PM EDT	Special Weather Statement	RNK	Greenbrier	26 min
Jun 22, 6:32 PM EDT	Areal Flood Advisory	RNK	Mercer, Summers	2 hr
Jun 22, 6:41 PM EDT	Severe Thunderstorm Warning	RNK	Greenbrier	42 min
Jun 22, 7:17 PM EDT	Areal Flood Advisory	RNK	Greenbrier	3 hr

Nearby

Flash Flood Watches in Virginia, 2018 Every flash flood watch in 2018

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.