Alert archive / Ohio / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 23, NWS Wilmington, OH

April 10, 1999Butler County, Ohio

NWS Wilmington, OH issued this severe thunderstorm warning at Apr 10, 1999, 11:47 PM EDT for Butler County, Ohio. It was in force for 48 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Apr 10, 1999, 11:47 PM EDT (03:47 UTC)
Expired
Apr 11, 1999, 12:35 AM EDT
In force
48 min
Issued by
NWS Wilmington, OH
Area
Whole counties

County Butler County, OH

The radar

The Cincinnati radar (KILN), 65 km from the middle of the area, began a volume at 03:47 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.

What was reported inside it

TimeReportWhereRemark
Apr 10, 11:49 PM EDTHail 0.75West Chester, OH

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 00:00Z, 3.8 hours before the alert went out and 67 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-pSkew-T log-p diagram, Cncnati-Daytn, OH at 00:00Z on 1999-04-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Cncnati-Daytn, OH at 00:00Z on 1999-04-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -1 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
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 severe thunderstorm 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 severe thunderstorm warning went out at Apr 10, 8:40 PM EDT, 3 hours 7 minutes earlier.

Area forecast discussion, Apr 10, 8:40 PM EDT, 3 hours 7 minutes before
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In the hours before

Special weather statement, Apr 10, 10:28 PM EDT, 1 hour 19 minutes before
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Special weather statement, Apr 10, 10:28 PM EDT, 1 hour 19 minutes before
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<body>
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    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
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Special weather statement, Apr 10, 11:42 PM EDT, 5 minutes before
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Special weather statement, Apr 10, 11:42 PM EDT, 5 minutes before
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      <h1 id="headline">This service is currently unavailable.</h1>
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      <p id="message2">
        Please try again in a few minutes.
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The office that day

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

IssuedProductOfficeCountiesLasted
Apr 10, 10:54 PM EDTSevere Thunderstorm WarningILNAuglaize, Shelby51 min
Apr 10, 11:12 PM EDTSevere Thunderstorm WarningILNHardin58 min
Apr 10, 11:54 PM EDTSevere Thunderstorm WarningILNWarren46 min
Apr 10, 11:56 PM EDTSevere Thunderstorm WarningILNUnion34 min
Apr 11, 12:02 AM EDTSevere Thunderstorm WarningILNClinton63 min
Apr 11, 12:06 AM EDTSevere Thunderstorm WarningILNDelaware49 min
Apr 11, 4:27 AM EDTSevere Thunderstorm WarningILNHighland48 min
Apr 11, 4:50 AM EDTFlash Flood WarningILNBrown, Highland2 hr
Apr 11, 4:50 AM EDTFlash Flood WarningILNClermont2 hr

Nearby

Severe Thunderstorm Warnings in Ohio, 1999Every severe thunderstorm 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.