Alert archive / West Virginia / Flash Flood Watches in 2009

Flash Flood Watch 4, NWS Charleston, WV

June 11, 200919 counties in West Virginia; Gallia County, Lawrence County, Ohio; 4 counties in Kentucky

NWS Charleston, WV issued this flash flood watch at Jun 11, 2009, 10:57 AM EDT for 19 counties in West Virginia; Gallia County, Lawrence County, Ohio; 4 counties in Kentucky. It took effect at Jun 11, 2009, 2:00 PM EDT. It was in force for 17 hr.

The area

The counties it named.

The facts

Issued: Jun 11, 2009, 10:57 AM EDT (14:57 UTC)
In effect from: Jun 11, 2009, 2:00 PM EDT
Expired: Jun 12, 2009, 7:00 AM EDT
In force: 17 hr
Issued by: NWS Charleston, WV
Flood severity: None

All 25 counties

Boyd County, KY, Carter County, KY, Greenup County, KY, Lawrence County, KY, Gallia County, OH, Lawrence County, OH, Boone County, WV, Braxton County, WV, Cabell County, WV, Calhoun County, WV, Clay County, WV, Gilmer County, WV, Jackson County, WV, Kanawha County, WV, Lewis County, WV, Lincoln County, WV, Logan County, WV, Mason County, WV, McDowell County, WV, Mingo County, WV, Putnam County, WV, Roane County, WV, Upshur County, WV, Wayne County, WV, Wyoming County, WV

The radar

The Charleston,WV radar (KRLX), 12 km from the middle of the area, began a volume at 15:00 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 12:00Z, 3.0 hours before the alert went out and 208 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: 143 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 499 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 140 m²/s²
0-3 km storm-relative helicity: 250 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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 11, 10:52 AM EDT, 5 minutes earlier.

Area forecast discussion, Jun 11, 10:52 AM EDT, 5 minutes before

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Hazardous weather outlook, Jun 11, 4:59 AM EDT, 5 hours 58 minutes before

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In the hours before

Special weather statement, Jun 11, 6:47 AM EDT, 4 hours 10 minutes before

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Special weather statement, Jun 11, 7:58 AM EDT, 2 hours 59 minutes before

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Special weather statement, Jun 11, 8:26 AM EDT, 2 hours 31 minutes before

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Special weather statement, Jun 11, 8:42 AM EDT, 2 hours 15 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 11, 5:24 PM EDT	Flash Flood Warning	RLX	Logan, McDowell, Mingo, Wyoming	114 min

Nearby

Flash Flood Watches in West Virginia, 2009 Flash Flood Watches in Kentucky, 2009 Flash Flood Watches in Ohio, 2009 Every flash flood watch in 2009

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.