Alert archive / Kentucky / Mesoscale Discussions in 2011

Mesoscale Discussion 1581

July 11, 20117 states

The Storm Prediction Center issued this mesoscale discussion at Jul 11, 2011, 5:54 PM EDT for 7 states. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued
Jul 11, 2011, 5:54 PM EDT (21:54 UTC)
Expired
Jul 11, 2011, 7:30 PM EDT
In force
96 min
Issued by
the Storm Prediction Center
All 92 counties

Dearborn County, IN, Franklin County, IN, Ohio County, IN, Bath County, KY, Boone County, KY, Bourbon County, KY, Bracken County, KY, Breathitt County, KY, Campbell County, KY, Clark County, KY, Estill County, KY, Fleming County, KY, Floyd County, KY, Gallatin County, KY, Grant County, KY, Harrison County, KY, Johnson County, KY, Kenton County, KY, Knott County, KY, Lee County, KY, Magoffin County, KY, Martin County, KY, Mason County, KY, Menifee County, KY, Montgomery County, KY, Morgan County, KY, Nicholas County, KY, Owsley County, KY, Pendleton County, KY, Pike County, KY, Powell County, KY, Robertson County, KY, Rowan County, KY, Wolfe County, KY, Allegany County, MD, Garrett County, MD, Brown County, OH, Clermont County, OH, Hamilton County, OH, Bedford County, PA, Blair County, PA, Cambria County, PA, Centre County, PA, Clearfield County, PA, Elk County, PA, Fulton County, PA, Huntingdon County, PA, Indiana County, PA, Somerset County, PA, Westmoreland County, PA, Alleghany County, VA, Augusta County, VA, Bath County, VA, Bland County, VA, Botetourt County, VA, Buchanan County, VA, City of Buena Vista, VA, City of Covington, VA, City of Harrisonburg, VA, City of Lexington, VA, City of Roanoke, VA, City of Salem, VA, City of Staunton, VA, City of Waynesboro, VA, Craig County, VA, Dickenson County, VA, Frederick County, VA, Giles County, VA, Highland County, VA, Montgomery County, VA, Page County, VA, Roanoke County, VA, Rockbridge County, VA, Rockingham County, VA, Shenandoah County, VA, Tazewell County, VA, Grant County, WV, Greenbrier County, WV, Hampshire County, WV, Hardy County, WV, Logan County, WV, McDowell County, WV, Mercer County, WV, Mineral County, WV, Mingo County, WV, Monroe County, WV, Morgan County, WV, Pendleton County, WV, Raleigh County, WV, Summers County, WV, Tucker County, WV, Wyoming County, WV

The radar

The Charleston,WV radar (KRLX), 67 km from the middle of the area, began a volume at 21:56 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

Pittsburgh, PA (KPIT), launched 12:00Z, 9.9 hours before the alert went out and 205 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, Pittsburgh, PA at 12:00Z on 2011-07-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 135 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, Pittsburgh, PA at 12:00Z on 2011-07-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 79 square meters per square second.1939Sfc1 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
135 J/kg
Mixed-layer CIN
-120 J/kg
Mixed-layer LCL
1116 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
79 m²/s²
0-3 km storm-relative helicity
113 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

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
Jul 11, 6:37 AM EDTSevere Thunderstorm WatchSPCAdams, Allen, Blackford, Cass, DeKalb, Elkhart and 22 more6 hr
Jul 11, 8:10 AM EDTMesoscale DiscussionSPCAllen, Cass, DeKalb, Elkhart, Fulton, Huntington and 17 more95 min
Jul 11, 8:50 AM EDTMesoscale DiscussionSPCAdams, Allen, Bartholomew, Benton, Blackford, Boone and 68 more55 min
Jul 11, 10:55 AM EDTMesoscale DiscussionSPCAdams, Allen, Blackford, Carroll, Cass, Clinton and 26 more65 min
Jul 11, 12:34 PM EDTMesoscale DiscussionSPCAdams, Allen, Blackford, Delaware, Grant, Huntington and 5 more56 min
Jul 11, 3:43 PM EDTMesoscale DiscussionSPCDearborn, Ohio, Ripley, Switzerland92 min
Jul 11, 6:16 PM EDTMesoscale DiscussionSPCAdams, Allen, Benton, Blackford, Boone, Carroll and 28 more59 min
Jul 11, 7:18 PM EDTSevere Thunderstorm WatchSPCAdams, Blackford, Boone, Carroll, Cass, Clinton and 30 more3 hr
Jul 11, 10:16 AM EDTSevere Thunderstorm WatchSPCLewis9 hr
Jul 11, 2:16 PM EDTSevere Thunderstorm WatchSPCBoyd, Carter, Greenup, Lawrence6 hr
Jul 11, 5:47 PM EDTSevere Thunderstorm WatchSPCAllegany, Anne Arundel, Baltimore, Calvert, Carroll, Charles and 8 more5 hr
Jul 11, 7:44 PM EDTMesoscale DiscussionSPCAllegany, Anne Arundel, Baltimore, Calvert, Carroll, Cecil and 12 more61 min
Jul 11, 1:42 PM EDTMesoscale DiscussionSPCAshland, Ashtabula, Athens, Auglaize, Belmont, Carroll and 59 more93 min

Nearby

Mesoscale Discussions in Kentucky, 2011Mesoscale Discussions in Virginia, 2011Mesoscale Discussions in West Virginia, 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.