Alert archive / West Virginia / Flash Flood Watches in 2019

Flash Flood Watch 2, NWS Blacksburg, VA

May 4, 2019Smyth County, Tazewell County, Virginia; 4 counties in West Virginia

NWS Blacksburg, VA issued this flash flood watch at May 4, 2019, 12:33 PM EDT for Smyth County, Tazewell County, Virginia; 4 counties in West Virginia. It took effect at May 4, 2019, 5:00 PM EDT. It was in force for 12 hr.

The area

The counties it named.

The facts

Issued: May 4, 2019, 12:33 PM EDT (16:33 UTC)
In effect from: May 4, 2019, 5:00 PM EDT
Expired: May 5, 2019, 5:00 AM EDT
In force: 12 hr
Issued by: NWS Blacksburg, VA
Flood severity: None

Counties Smyth County, VA, Tazewell County, VA, Greenbrier County, WV, Mercer County, WV, Monroe County, WV, Summers County, WV

The radar

The Roanoke radar (KFCX), 79 km from the middle of the area, began a volume at 16:35 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, 4.6 hours before the alert went out and 136 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: 732 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: -12 m²/s²
0-3 km storm-relative helicity: -8 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 May 4, 10:15 AM EDT, 2 hours 18 minutes earlier.

Area forecast discussion, May 4, 10:15 AM EDT, 2 hours 18 minutes before

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Hazardous weather outlook, May 4, 11:17 AM EDT, 1 hour 16 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
May 3, 8:27 PM EDT	Special Weather Statement	RNK	Rockbridge, City of Buena Vista, City of Lexington	33 min
May 3, 8:48 PM EDT	Special Weather Statement	RNK	Smyth, Tazewell	42 min
May 3, 9:02 PM EDT	Special Weather Statement	RNK	Bland	58 min
May 3, 9:58 PM EDT	Special Weather Statement	RNK	Craig, Giles, Montgomery	62 min
May 3, 10:23 PM EDT	Special Weather Statement	RNK	Floyd, Montgomery, Pulaski, City of Radford	37 min
May 3, 11:00 PM EDT	Special Weather Statement	RNK	Floyd, Franklin, Montgomery, City of Radford	45 min
May 4, 4:24 PM EDT	Areal Flood Advisory	RNK	Carroll, City of Galax	4 hr
May 4, 4:48 PM EDT	Flash Flood Warning	RNK	Carroll, Grayson, City of Galax	3 hr
May 4, 4:59 PM EDT	Special Weather Statement	RNK	Franklin	61 min
May 4, 5:02 PM EDT	Severe Thunderstorm Warning	RNK	Floyd, Franklin, Henry, Patrick	41 min
May 4, 6:51 PM EDT	Special Weather Statement	RNK	Pittsylvania	54 min
May 4, 7:02 PM EDT	Severe Thunderstorm Warning	RNK	Franklin, Henry, Pittsylvania	58 min

Nearby

Flash Flood Watches in West Virginia, 2019 Flash Flood Watches in Virginia, 2019 Every flash flood watch in 2019

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.