Alert archive / Ohio / Flash Flood Watches in 2017

Flash Flood Watch 7, NWS Wilmington, OH

July 12, 201732 counties in Ohio; Boone County, Campbell County, Kenton County, Kentucky; 7 counties in Indiana

NWS Wilmington, OH issued this flash flood watch at Jul 12, 2017, 2:40 PM EDT for 32 counties in Ohio; Boone County, Campbell County, Kenton County, Kentucky; 7 counties in Indiana. It took effect at Jul 13, 2017, 4:00 AM EDT. It was in force for 24 hr.

The area

The counties it named.

The facts

Issued: Jul 12, 2017, 2:40 PM EDT (18:40 UTC)
In effect from: Jul 13, 2017, 4:00 AM EDT
Expired: Jul 14, 2017, 4:00 AM EDT
In force: 24 hr
Issued by: NWS Wilmington, OH
Flood severity: None

All 42 counties

Dearborn County, IN, Fayette County, IN, Franklin County, IN, Ohio County, IN, Ripley County, IN, Union County, IN, Wayne County, IN, Boone County, KY, Campbell County, KY, Kenton County, KY, Adams County, OH, Auglaize County, OH, Brown County, OH, Butler County, OH, Champaign County, OH, Clark County, OH, Clermont County, OH, Clinton County, OH, Darke County, OH, Delaware County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Greene County, OH, Hamilton County, OH, Hardin County, OH, Highland County, OH, Hocking County, OH, Licking County, OH, Logan County, OH, Madison County, OH, Mercer County, OH, Miami County, OH, Montgomery County, OH, Pickaway County, OH, Pike County, OH, Preble County, OH, Ross County, OH, Scioto County, OH, Shelby County, OH, Union County, OH, Warren County, OH

The radar

The Cincinnati radar (KILN), 26 km from the middle of the area, began a volume at 18:42 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 12:00Z, 6.7 hours before the alert went out and 341 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: 501 J/kg
Mixed-layer CIN: -42 J/kg
Mixed-layer LCL: 642 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 180 m²/s²
0-3 km storm-relative helicity: 184 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.2

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 Wilmington, OH wrote its last area forecast discussion before this flash flood watch went out at Jul 12, 1:26 PM EDT, 1 hour 14 minutes earlier.

Area forecast discussion, Jul 12, 1:26 PM EDT, 1 hour 14 minutes before

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Hazardous weather outlook, Jul 12, 5:05 AM EDT, 9 hours 35 minutes before

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In the hours before

Local storm report, Jul 12, 11:13 AM EDT, 3 hours 27 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 12, 5:49 PM EDT	Special Weather Statement	ILN	Brown	26 min
Jul 12, 5:30 PM EDT	Special Weather Statement	ILN	Campbell	15 min

Nearby

Flash Flood Watches in Ohio, 2017 Flash Flood Watches in Indiana, 2017 Flash Flood Watches in Kentucky, 2017 Every flash flood watch in 2017

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.