Alert archive / Virginia / Flash Flood Warnings in 2024

Flash Flood Warning 43, NWS Blacksburg, VA

August 30, 2024Grayson County, Smyth County, Wythe County, Virginia; Alleghany County, Ashe County, North Carolina

NWS Blacksburg, VA issued this flash flood warning at Aug 30, 2024, 8:26 PM EDT for Grayson County, Smyth County, Wythe County, Virginia; Alleghany County, Ashe County, North Carolina. It was in force for 85 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 30, 2024, 8:26 PM EDT (00:26 UTC)
Expired: Aug 30, 2024, 9:51 PM EDT
In force: 85 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon
Flood severity: None

Counties Alleghany County, NC, Ashe County, NC, Grayson County, VA, Smyth County, VA, Wythe County, VA

The radar

The Roanoke radar (KFCX), 99 km from the middle of the area, began a volume at 00:29 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

Cncnati-Daytn, OH (KILN), launched 00:00Z, 0.4 hours before the alert went out and 377 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: 575 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 2154 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 22 m²/s²
0-3 km storm-relative helicity: 42 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 warning 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 warning went out at Aug 30, 7:34 PM EDT, 52 minutes earlier.

Area forecast discussion, Aug 30, 7:34 PM EDT, 52 minutes before

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Hazardous weather outlook, Aug 30, 2:48 PM EDT, 5 hours 38 minutes before

Hazardous Weather Outlook
National Weather Service Blacksburg VA
248 PM EDT Fri Aug 30 2024

VAZ007-011-014-018>020-022>024-034-035-045>047-WVZ042>044-507-508-
311900-
Tazewell-Giles-Montgomery-Craig-Alleghany VA-Bath-Roanoke-Botetourt-
Rockbridge-Bedford-Amherst-Campbell-Appomattox-Buckingham-Mercer-
Summers-Monroe-Eastern Greenbrier-Western Greenbrier-
248 PM EDT Fri Aug 30 2024

This Hazardous Weather Outlook is for central Virginia, south
central Virginia, southwest Virginia, west central Virginia and
southeast West Virginia.

.DAY ONE...This afternoon and tonight.

There is a marginal risk of severe thunderstorms this afternoon and
evening. The main threat is damaging winds and heavy rain which could
lead to flooding.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

There is a marginal risk of severe storms Saturday afternoon and
evening, and again Sunday afternoon and evening. Damaging winds and
heavy rain are the main threats.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

NCZ001>006-018>020-VAZ009-010-012-013-015>017-032-033-043-044-058-
059-311900-
Ashe-Alleghany NC-Surry-Stokes-Rockingham-Caswell-Watauga-Wilkes-
Yadkin-Smyth-Bland-Wythe-Pulaski-Grayson-Carroll-Floyd-Patrick-
Franklin-Henry-Pittsylvania-Halifax-Charlotte-
248 PM EDT Fri Aug 30 2024

This Hazardous Weather Outlook is for north central North Carolina,
northwest North Carolina, south central Virginia, southwest
Virginia and west central Virginia.

.DAY ONE...This afternoon and tonight.

There is a marginal risk of severe thunderstorms this afternoon and
evening. Damaging winds will be the main threat.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

There is a marginal risk of severe storms Saturday afternoon and
evening, and again Sunday afternoon and evening. Damaging wind and
heavy rain are the main threats.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

In the hours before

Local storm report, Aug 30, 7:08 PM EDT, 1 hour 18 minutes before

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Special weather statement, Aug 30, 7:31 PM EDT, 55 minutes before

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Local storm report, Aug 30, 7:39 PM EDT, 47 minutes before

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Local storm report, Aug 30, 7:45 PM EDT, 41 minutes before

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Local storm report, Aug 30, 7:51 PM EDT, 35 minutes before

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Local storm report, Aug 30, 8:23 PM EDT, 3 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
Aug 30, 8:02 PM EDT	Severe Thunderstorm Warning	RNK	Grayson, Smyth	58 min
Aug 30, 8:18 PM EDT	Areal Flood Advisory	RNK	Grayson, Smyth, Wythe	86 min
Aug 31, 12:15 PM EDT	Special Weather Statement	RNK	City of Galax	30 min
Aug 31, 1:26 PM EDT	Special Weather Statement	RNK	Bland	34 min
Aug 31, 1:56 PM EDT	Special Weather Statement	RNK	Bath	34 min
Aug 31, 2:09 PM EDT	Special Weather Statement	RNK	Pulaski	36 min
Aug 31, 2:17 PM EDT	Severe Thunderstorm Warning	RNK	Bland, Giles, Montgomery, Pulaski, City of Radford	21 min
Aug 31, 2:41 PM EDT	Special Weather Statement	RNK	Alleghany, City of Covington	34 min
Aug 31, 2:56 PM EDT	Special Weather Statement	RNK	Grayson	34 min
Aug 31, 3:15 PM EDT	Special Weather Statement	RNK	Craig, Roanoke	30 min
Aug 31, 3:20 PM EDT	Severe Thunderstorm Warning	RNK	Alleghany, Craig, Roanoke	40 min
Aug 31, 3:56 PM EDT	Special Weather Statement	RNK	Floyd	34 min
Aug 31, 4:02 PM EDT	Special Weather Statement	RNK	Alleghany, Craig, Roanoke, City of Covington	28 min
Aug 31, 4:23 PM EDT	Areal Flood Advisory	RNK	Alleghany	3 hr
Aug 31, 4:25 PM EDT	Special Weather Statement	RNK	City of Roanoke, City of Salem	50 min
Aug 31, 4:28 PM EDT	Special Weather Statement	RNK	Tazewell	47 min
Aug 31, 4:35 PM EDT	Severe Thunderstorm Warning	RNK	Botetourt, Craig, Franklin, Montgomery, Roanoke, City of Roanoke and 1 more	55 min
Aug 31, 4:39 PM EDT	Flash Flood Warning	RNK	Tazewell	3 hr
Aug 31, 5:03 PM EDT	Special Weather Statement	RNK	Bath	27 min
Aug 31, 5:25 PM EDT	Severe Thunderstorm Warning	RNK	Bedford, Botetourt, Roanoke, City of Roanoke	32 min
Aug 31, 5:42 PM EDT	Special Weather Statement	RNK	Giles	33 min
Aug 31, 6:04 PM EDT	Severe Thunderstorm Warning	RNK	Amherst, Rockbridge, City of Buena Vista, City of Lexington	56 min
Aug 31, 6:27 PM EDT	Special Weather Statement	RNK	Giles, Montgomery, City of Radford	33 min
Aug 31, 6:36 PM EDT	Severe Thunderstorm Warning	RNK	Craig, Floyd, Giles, Montgomery, Pulaski, Roanoke and 2 more	54 min
Aug 31, 7:54 PM EDT	Special Weather Statement	RNK	Franklin, City of Roanoke, City of Salem	36 min
Aug 30, 8:58 PM EDT	Special Weather Statement	RNK	Watauga	47 min
Aug 30, 9:17 PM EDT	Areal Flood Advisory	RNK	Watauga	3 hr
Aug 31, 2:12 PM EDT	Special Weather Statement	RNK	Ashe	33 min
Aug 31, 1:12 PM EDT	Special Weather Statement	RNK	Greenbrier	33 min
Aug 31, 3:19 PM EDT	Special Weather Statement	RNK	Greenbrier	26 min
Aug 31, 4:05 PM EDT	Special Weather Statement	RNK	Summers	25 min

Nearby

Flash Flood Warnings in Virginia, 2024 Flash Flood Warnings in North Carolina, 2024 Every flash flood warning in 2024

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.