Alert archive / Ohio / Mesoscale Discussions in 2007

Mesoscale Discussion 2116

October 18, 200723 counties in Kentucky; 31 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Oct 18, 2007, 7:30 PM EDT for 23 counties in Kentucky; 31 counties in Ohio. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued
Oct 18, 2007, 7:30 PM EDT (23:30 UTC)
Expired
Oct 18, 2007, 9:00 PM EDT
In force
90 min
Issued by
the Storm Prediction Center
All 54 counties

Bath County, KY, Boone County, KY, Bourbon County, KY, Bracken County, KY, Campbell County, KY, Clark County, KY, Fayette County, KY, Fleming County, KY, Franklin County, KY, Gallatin County, KY, Garrard County, KY, Grant County, KY, Harrison County, KY, Jessamine County, KY, Kenton County, KY, Mason County, KY, Montgomery County, KY, Nicholas County, KY, Owen County, KY, Pendleton County, KY, Robertson County, KY, Scott County, KY, Woodford County, KY, Adams County, OH, Allen County, OH, Auglaize County, OH, Brown County, OH, Butler County, OH, Champaign County, OH, Clark County, OH, Clermont County, OH, Clinton County, OH, Delaware County, OH, Fayette County, OH, Greene County, OH, Hamilton County, OH, Hancock County, OH, Hardin County, OH, Henry County, OH, Highland County, OH, Logan County, OH, Madison County, OH, Marion County, OH, Miami County, OH, Montgomery County, OH, Preble County, OH, Putnam County, OH, Sandusky County, OH, Seneca County, OH, Shelby County, OH, Union County, OH, Warren County, OH, Wood County, OH, Wyandot County, OH

The radar

The Cincinnati radar (KILN), 30 km from the middle of the area, began a volume at 23:33 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 12:00Z, 11.5 hours before the alert went out and 31 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 12:00Z on 2007-10-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 21 joules per kilogram.LCLLFCEL10008507005003002001001 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 12:00Z on 2007-10-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 320 square meters per square second.19395878Sfc1 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
21 J/kg
Mixed-layer CIN
-89 J/kg
Mixed-layer LCL
530 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
320 m²/s²
0-3 km storm-relative helicity
258 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 17, 11:56 PM EDTMesoscale DiscussionSPCBallard, Caldwell, Calloway, Carlisle, Crittenden, Fulton and 8 more64 min
Oct 18, 1:27 AM EDTMesoscale DiscussionSPCBallard, Calloway, Carlisle, Fulton, Graves, Hickman and 3 more93 min
Oct 18, 3:27 AM EDTTornado WatchSPCBallard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 16 more4 hr
Oct 18, 5:08 AM EDTMesoscale DiscussionSPCBallard, Caldwell, Calloway, Carlisle, Crittenden, Fulton and 12 more67 min
Oct 18, 5:37 AM EDTTornado WatchSPCBreckinridge, Hancock, Jefferson, Meade, Ohio, Oldham and 1 more3 hr
Oct 18, 11:26 AM EDTMesoscale DiscussionSPCAdair, Allen, Anderson, Barren, Boyle, Breckinridge and 61 more2 hr
Oct 18, 2:31 PM EDTTornado WatchSPCAdair, Allen, Ballard, Barren, Breckinridge, Bullitt and 47 more9 hr
Oct 18, 2:44 PM EDTMesoscale DiscussionSPCHenderson, Union2 hr
Oct 18, 6:39 PM EDTMesoscale DiscussionSPCAllen, Ballard, Barren, Breckinridge, Bullitt, Butler and 41 more66 min
Oct 18, 7:34 PM EDTMesoscale DiscussionSPCDefiance, Fulton, Paulding, Williams116 min

Nearby

Mesoscale Discussions in Ohio, 2007Mesoscale Discussions in Kentucky, 2007Every mesoscale discussion in 2007

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.