Alert archive / Ohio / Flash Flood Watches in 2011

Flash Flood Watch 1, NWS Wilmington, OH

April 21, 201132 counties in Ohio; 12 counties in Kentucky; 8 counties in Indiana

NWS Wilmington, OH issued this flash flood watch at Apr 21, 2011, 4:08 AM EDT for 32 counties in Ohio; 12 counties in Kentucky; 8 counties in Indiana. It took effect at Apr 22, 2011, 6:00 AM EDT. It was in force for 4 days.

The area

The counties it named.

The facts

Issued: Apr 21, 2011, 4:08 AM EDT (08:08 UTC)
In effect from: Apr 22, 2011, 6:00 AM EDT
Expired: Apr 25, 2011, 8:00 PM EDT
In force: 4 days
Issued by: NWS Wilmington, OH
Flood severity: None

All 52 counties

Dearborn County, IN, Fayette County, IN, Franklin County, IN, Ohio County, IN, Ripley County, IN, Switzerland County, IN, Union County, IN, Wayne 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, 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), 20 km from the middle of the area, began a volume at 08:11 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, 8.1 hours before the alert went out and 22 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 682 m above ground
0-6 km bulk shear: 77 kt
0-1 km storm-relative helicity: -89 m²/s²
0-3 km storm-relative helicity: 5 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Apr 21, 1:45 AM EDT, 2 hours 23 minutes earlier.

Area forecast discussion, Apr 21, 1:45 AM EDT, 2 hours 23 minutes before

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Hazardous weather outlook, Apr 20, 5:21 PM EDT, 10 hours 47 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE WILMINGTON OH
521 PM EDT WED APR 20 2011

INZ050-058-059-066-073>075-080-KYZ089>100-OHZ026-034-035-042>046-
051>056-060>065-070>074-077>082-088-212130-
WAYNE-FAYETTE IN-UNION IN-FRANKLIN IN-RIPLEY-DEARBORN-OHIO-
SWITZERLAND-CARROLL-GALLATIN-BOONE-KENTON-CAMPBELL-OWEN-GRANT-
PENDLETON-BRACKEN-ROBERTSON-MASON-LEWIS-HARDIN-MERCER-AUGLAIZE-DARKE-
SHELBY-LOGAN-UNION OH-DELAWARE-MIAMI-CHAMPAIGN-CLARK-MADISON-
FRANKLIN OH-LICKING-PREBLE-MONTGOMERY-GREENE-FAYETTE OH-PICKAWAY-
FAIRFIELD-BUTLER-WARREN-CLINTON-ROSS-HOCKING-HAMILTON-CLERMONT-BROWN-
HIGHLAND-ADAMS-PIKE-SCIOTO-
521 PM EDT WED APR 20 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL
INDIANA...SOUTHEAST INDIANA...NORTHEAST KENTUCKY...NORTHERN
KENTUCKY...CENTRAL OHIO...MIAMI VALLEY OF OHIO...SOUTH CENTRAL
OHIO...SOUTHWEST OHIO AND WEST CENTRAL OHIO.

.DAY ONE...TONIGHT.

RIVERS THROUGH OUT THE AREA ARE RUNNING HIGH...WITH SEVERAL
POINTS IN FLOOD. PLEASE CHECK THE RIVER FLOOD PRODUCTS FOR DETAILS
AND THE LATEST FORECASTS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.

RIVERS THROUGH OUT THE AREA ARE RUNNING HIGH...WITH SEVERAL
POINTS IN FLOOD. PLEASE CHECK THE RIVER FLOOD PRODUCTS FOR DETAILS
AND THE LATEST FORECASTS.

A WARM FRONT WILL DEVELOP OVER THE OHIO VALLEY ON THURSDAY NIGHT
AND LIFT NORTHWARD ON FRIDAY. ANOTHER BOUNDARY WILL CROSS THE OHIO
VALLEY FROM THE WEST ON SATURDAY...LAYING OUT ALONG THE OHIO RIVER
OVERNIGHT AND ON SUNDAY. MOIST AIR BEING PULLED INTO THE REGION
WILL GET WRUNG OUT ALONG AND NEAR THESE SYSTEMS...AND COULD RESULT
IN HEAVY RAINFALL. ANY PROLONGED OR HEAVY RAIN IN THE NEXT WEEK
WILL LIKELY RESULT IN RENEWED FLOODING DUE TO THE ALREADY
SATURATED GROUND AND SWOLLEN CREEKS AND STREAMS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

In the hours before

Local storm report, Apr 20, 10:38 PM EDT, 5 hours 30 minutes before

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Local storm report, Apr 20, 11:11 PM EDT, 4 hours 57 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
Apr 21, 8:58 AM EDT	River Flood Warning	ILN	Franklin, Madison, Pickaway	14 hr
Apr 21, 3:51 PM EDT	River Flood Warning	ILN	Clermont, Hamilton	8 days
Apr 20, 9:16 PM EDT	River Flood Warning	ILN	Fayette, Franklin	6 hr

Nearby

Flash Flood Watches in Ohio, 2011 Flash Flood Watches in Kentucky, 2011 Flash Flood Watches in Indiana, 2011 Every flash flood watch in 2011

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.