Alert archive / West Virginia / Flash Flood Watches in 2018

Flash Flood Watch 5, NWS Charleston, WV

June 21, 201824 counties in West Virginia; 8 counties in Ohio

NWS Charleston, WV issued this flash flood watch at Jun 21, 2018, 3:41 AM EDT for 24 counties in West Virginia; 8 counties in Ohio. It took effect at Jun 21, 2018, 1:00 PM EDT. It was in force for 37 hr.

The area

The counties it named.

The facts

Issued: Jun 21, 2018, 3:41 AM EDT (07:41 UTC)
In effect from: Jun 21, 2018, 1:00 PM EDT
Expired: Jun 23, 2018, 2:00 AM EDT
In force: 37 hr
Issued by: NWS Charleston, WV
Flood severity: None

All 32 counties

Athens County, OH, Gallia County, OH, Jackson County, OH, Meigs County, OH, Morgan County, OH, Perry County, OH, Vinton County, OH, Washington County, OH, Barbour County, WV, Braxton County, WV, Calhoun County, WV, Clay County, WV, Doddridge County, WV, Gilmer County, WV, Harrison County, WV, Jackson County, WV, Kanawha County, WV, Lewis County, WV, Mason County, WV, Nicholas County, WV, Pleasants County, WV, Pocahontas County, WV, Putnam County, WV, Randolph County, WV, Ritchie County, WV, Roane County, WV, Taylor County, WV, Tyler County, WV, Upshur County, WV, Webster County, WV, Wirt County, WV, Wood County, WV

The radar

The Charleston,WV radar (KRLX), 88 km from the middle of the area, began a volume at 07:41 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

Pittsburgh, PA (KAGC), launched 00:00Z, 7.7 hours before the alert went out and 184 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: 522 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 626 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: -25 m²/s²
0-3 km storm-relative helicity: -2 m²/s²
Significant tornado parameter: -0.1
Supercell composite: -0.7

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 Charleston, WV wrote its last area forecast discussion before this flash flood watch went out at Jun 21, 3:30 AM EDT, 11 minutes earlier.

Area forecast discussion, Jun 21, 3:30 AM EDT, 11 minutes before

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Hazardous weather outlook, Jun 21, 3:17 AM EDT, 24 minutes before

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The office that day

Everything else NWS Charleston, WV issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 21, 2:15 PM EDT	Flash Flood Warning	RLX	Calhoun, Jackson, Kanawha, Putnam, Roane	8 hr
Jun 21, 5:38 PM EDT	Areal Flood Warning	RLX	Pleasants, Wood	9 hr

Nearby

Flash Flood Watches in West Virginia, 2018 Flash Flood Watches in Ohio, 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.