Alert archive / Ohio / Mesoscale Discussions in 2011

Mesoscale Discussion 617

April 27, 20114 counties in Kentucky; 42 counties in Ohio; 13 counties in West Virginia

The Storm Prediction Center issued this mesoscale discussion at Apr 27, 2011, 9:39 AM EDT for 4 counties in Kentucky; 42 counties in Ohio; 13 counties in West Virginia. It was in force for 66 min.

The area

The outline as issued.

The facts

Issued
Apr 27, 2011, 9:39 AM EDT (13:39 UTC)
Expired
Apr 27, 2011, 10:45 AM EDT
In force
66 min
Issued by
the Storm Prediction Center
All 59 counties

Boyd County, KY, Carter County, KY, Greenup County, KY, Lewis County, KY, Adams County, OH, Ashland County, OH, Athens County, OH, Belmont County, OH, Champaign County, OH, Clark County, OH, Clinton County, OH, Coshocton County, OH, Crawford County, OH, Delaware County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Gallia County, OH, Greene County, OH, Guernsey County, OH, Highland County, OH, Hocking County, OH, Holmes County, OH, Jackson County, OH, Knox County, OH, Lawrence County, OH, Licking County, OH, Logan County, OH, Madison County, OH, Marion County, OH, Meigs County, OH, Monroe County, OH, Morgan County, OH, Morrow County, OH, Muskingum County, OH, Noble County, OH, Perry County, OH, Pickaway County, OH, Pike County, OH, Richland County, OH, Ross County, OH, Scioto County, OH, Shelby County, OH, Union County, OH, Vinton County, OH, Washington County, OH, Cabell County, WV, Calhoun County, WV, Jackson County, WV, Kanawha County, WV, Lincoln County, WV, Mason County, WV, Pleasants County, WV, Putnam County, WV, Ritchie County, WV, Roane County, WV, Tyler County, WV, Wirt County, WV, Wood County, WV

The radar

The Cincinnati radar (KILN), 81 km from the middle of the area, began a volume at 13:38 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 12:00Z, 1.7 hours before the alert went out and 79 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 2011-04-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 279 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 2011-04-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 470 square meters per square second.1939587897Sfc1 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
279 J/kg
Mixed-layer CIN
-56 J/kg
Mixed-layer LCL
846 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
470 m²/s²
0-3 km storm-relative helicity
503 m²/s²
Significant tornado parameter
0.0
Supercell composite
4.9

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
Apr 26, 9:35 PM EDTMesoscale DiscussionSPCBreckinridge, Bullitt, Daviess, Hancock, Hardin, Henderson and 4 more55 min
Apr 26, 10:13 PM EDTMesoscale DiscussionSPCBallard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 16 more62 min
Apr 26, 10:58 PM EDTTornado WatchSPCAdair, Allen, Anderson, Barren, Bourbon, Boyle and 49 more7 hr
Apr 27, 5:33 AM EDTMesoscale DiscussionSPCAdair, Barren, Boyle, Casey, Clinton, Cumberland and 12 more57 min
Apr 27, 6:07 AM EDTTornado WatchSPCAdair, Allen, Anderson, Barren, Bourbon, Boyle and 28 more5 hr
Apr 27, 8:34 AM EDTTornado WatchSPCBath, Bell, Breathitt, Clay, Elliott, Estill and 21 more4 hr
Apr 27, 1:42 PM EDTSevere Thunderstorm WatchSPCBallard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 16 more5 hr
Apr 27, 3:22 PM EDTMesoscale DiscussionSPCBell, Breathitt, Clay, Floyd, Harlan, Jackson and 11 more83 min
Apr 27, 4:06 PM EDTMesoscale DiscussionSPCAllen, Ballard, Barren, Breckinridge, Butler, Caldwell and 28 more54 min
Apr 27, 4:29 PM EDTTornado WatchSPCBallard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 16 more5 hr
Apr 27, 5:38 PM EDTMesoscale DiscussionSPCAdair, Allen, Anderson, Barren, Bath, Bell and 90 more37 min
Apr 27, 5:44 PM EDTTornado WatchSPCAdair, Allen, Anderson, Barren, Bath, Bell and 92 more7 hr
Apr 27, 6:27 PM EDTMesoscale DiscussionSPCCrittenden, Daviess, Henderson, Trimble, Union, Webster63 min
Apr 27, 7:22 PM EDTTornado WatchSPCBoone, Bracken, Campbell, Carroll, Gallatin, Grant and 6 more8 hr
Apr 26, 8:33 PM EDTMesoscale DiscussionSPCAllen, Auglaize, Darke, Defiance, Fulton, Henry and 6 more57 min
Apr 27, 1:24 PM EDTMesoscale DiscussionSPCAshtabula, Belmont, Carroll, Columbiana, Guernsey, Harrison and 9 more96 min
Apr 27, 1:23 PM EDTTornado WatchSPCBerkeley, Grant, Hampshire, Hardy, Jefferson, Mineral and 2 more5 hr
Apr 27, 3:10 PM EDTTornado WatchSPCMarion, Monongalia, Preston, Tucker7 hr
Apr 27, 4:39 PM EDTMesoscale DiscussionSPCBerkeley, Grant, Hampshire, Hardy, Jefferson, Mineral and 2 more66 min
Apr 27, 6:15 PM EDTTornado WatchSPCBerkeley, Grant, Greenbrier, Hampshire, Hardy, Jefferson and 6 more6 hr

Nearby

Mesoscale Discussions in Ohio, 2011Mesoscale Discussions in West Virginia, 2011Mesoscale Discussions in Kentucky, 2011Every mesoscale discussion 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.