Alert archive / Ohio / Flash Flood Warnings in 1999

Flash Flood Warning 7, NWS Wilmington, OH

April 11, 1999Clermont County, Ohio

NWS Wilmington, OH issued this flash flood warning at Apr 11, 1999, 4:50 AM EDT for Clermont County, Ohio. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Apr 11, 1999, 4:50 AM EDT (08:50 UTC)
Expired: Apr 11, 1999, 6:50 AM EDT
In force: 2 hr
Issued by: NWS Wilmington, OH
Area: Whole counties

County Clermont County, OH

The radar

The Cincinnati radar (KILN), 50 km from the middle of the area, began a volume at 08:52 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, 8.8 hours before the alert went out and 52 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: 1256 m above ground
0-6 km bulk shear: 68 kt
0-1 km storm-relative helicity: -1 m²/s²
0-3 km storm-relative helicity: 129 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this flash flood warning 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 warning went out at Apr 11, 4:00 AM EDT, 50 minutes earlier.

Area forecast discussion, Apr 11, 4:00 AM EDT, 50 minutes before

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In the hours before

Special weather statement, Apr 10, 11:42 PM EDT, 5 hours 8 minutes before

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Special weather statement, Apr 10, 11:42 PM EDT, 5 hours 8 minutes before

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Local storm report, Apr 11, 12:49 AM EDT, 4 hours 1 minute 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 10, 10:54 PM EDT	Severe Thunderstorm Warning	ILN	Auglaize, Shelby	51 min
Apr 10, 11:12 PM EDT	Severe Thunderstorm Warning	ILN	Hardin	58 min
Apr 10, 11:47 PM EDT	Severe Thunderstorm Warning	ILN	Butler	48 min
Apr 10, 11:54 PM EDT	Severe Thunderstorm Warning	ILN	Warren	46 min
Apr 10, 11:56 PM EDT	Severe Thunderstorm Warning	ILN	Union	34 min
Apr 11, 12:02 AM EDT	Severe Thunderstorm Warning	ILN	Clinton	63 min
Apr 11, 12:06 AM EDT	Severe Thunderstorm Warning	ILN	Delaware	49 min
Apr 11, 4:27 AM EDT	Severe Thunderstorm Warning	ILN	Highland	48 min
Apr 11, 4:50 AM EDT	Flash Flood Warning	ILN	Brown, Highland	2 hr

Nearby

Flash Flood Warnings in Ohio, 1999 Every flash flood warning in 1999

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.