Alert archive / West Virginia / Flash Flood Watches in 2018

Flash Flood Watch 10, NWS Charleston, WV

August 1, 201828 counties in West Virginia

NWS Charleston, WV issued this flash flood watch at Aug 1, 2018, 3:40 AM EDT for 28 counties in West Virginia. It took effect at Aug 1, 2018, 12:00 PM EDT. It was in force for 54 hr.

The area

The counties it named.

The facts

Issued: Aug 1, 2018, 3:40 AM EDT (07:40 UTC)
In effect from: Aug 1, 2018, 12:00 PM EDT
Expired: Aug 3, 2018, 6:07 PM EDT
In force: 54 hr
Issued by: NWS Charleston, WV
Flood severity: None

All 28 counties

Barbour County, WV, Boone County, WV, Braxton County, WV, Calhoun County, WV, Clay County, WV, Doddridge County, WV, Fayette County, WV, Gilmer County, WV, Harrison County, WV, Jackson County, WV, Kanawha County, WV, Lewis County, WV, Lincoln County, WV, Logan County, WV, McDowell County, WV, Mingo County, WV, Nicholas County, WV, Pocahontas County, WV, Putnam County, WV, Raleigh County, WV, Randolph County, WV, Ritchie County, WV, Roane County, WV, Taylor County, WV, Upshur County, WV, Webster County, WV, Wirt County, WV, Wyoming County, WV

The radar

The Charleston,WV radar (KRLX), 65 km from the middle of the area, began a volume at 07:40 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, 7.7 hours before the alert went out and 259 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: 632 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 868 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 116 m²/s²
0-3 km storm-relative helicity: 104 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.2

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 Jul 31, 7:32 PM EDT, 8 hours 8 minutes earlier.

Area forecast discussion, Jul 31, 7:32 PM EDT, 8 hours 8 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
Jul 31, 9:36 PM EDT	Special Weather Statement	RLX	McDowell	69 min

Nearby

Flash Flood Watches in West 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.