Alert archive / Ohio / Flash Flood Watches in 2009

Flash Flood Watch 2, NWS Wilmington, OH

July 30, 200913 counties in Ohio; 12 counties in Kentucky; 4 counties in Indiana

NWS Wilmington, OH issued this flash flood watch at Jul 30, 2009, 8:27 PM EDT for 13 counties in Ohio; 12 counties in Kentucky; 4 counties in Indiana. It was in force for 12 hr.

The area

The counties it named.

The facts

Issued: Jul 30, 2009, 8:27 PM EDT (00:27 UTC)
Expired: Jul 31, 2009, 8:51 AM EDT
In force: 12 hr
Issued by: NWS Wilmington, OH
Flood severity: None

All 29 counties

Dearborn County, IN, Ohio County, IN, Ripley County, IN, Switzerland County, IN, Boone County, KY, Bracken County, KY, Campbell County, KY, Carroll County, KY, Gallatin County, KY, Grant County, KY, Kenton County, KY, Lewis County, KY, Mason County, KY, Owen County, KY, Pendleton County, KY, Robertson County, KY, Adams County, OH, Brown County, OH, Clermont County, OH, Clinton County, OH, Fairfield County, OH, Fayette County, OH, Hamilton County, OH, Highland County, OH, Hocking County, OH, Pickaway County, OH, Pike County, OH, Ross County, OH, Scioto County, OH

The radar

The Cincinnati radar (KILN), 51 km from the middle of the area, began a volume at 00:27 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, 0.5 hours before the alert went out and 53 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: 934 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 633 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 46 m²/s²
0-3 km storm-relative helicity: 113 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.1

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 Wilmington, OH wrote its last area forecast discussion before this flash flood watch went out at Jul 30, 8:14 PM EDT, 13 minutes earlier.

Area forecast discussion, Jul 30, 8:14 PM EDT, 13 minutes before

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Hazardous weather outlook, Jul 30, 12:22 PM EDT, 8 hours 5 minutes before

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The office that day

Everything else NWS Wilmington, OH issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 30, 11:01 PM EDT	Areal Flood Advisory	ILN	Brown, Clermont, Hamilton	3 hr
Jul 30, 11:54 PM EDT	Flash Flood Warning	ILN	Clermont, Hamilton	5 hr
Jul 31, 12:07 AM EDT	Areal Flood Advisory	ILN	Highland, Pike, Ross	4 hr
Jul 31, 6:17 AM EDT	Areal Flood Advisory	ILN	Adams, Brown, Scioto	103 min
Jul 31, 8:21 AM EDT	Areal Flood Advisory	ILN	Scioto	3 hr
Jul 31, 8:43 AM EDT	Areal Flood Advisory	ILN	Scioto	3 hr
Jul 30, 11:25 PM EDT	Areal Flood Advisory	ILN	Carroll, Gallatin, Grant, Owen	3 hr

Nearby

Flash Flood Watches in Ohio, 2009 Flash Flood Watches in Kentucky, 2009 Flash Flood Watches in Indiana, 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.