Alert archive / Kentucky / Mesoscale Discussions in 2011

Mesoscale Discussion 383

April 9, 20114 states

The Storm Prediction Center issued this mesoscale discussion at Apr 9, 2011, 6:41 AM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 9, 2011, 6:41 AM CDT (11:41 UTC)
Expired
Apr 9, 2011, 8:45 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 125 counties

Edwards County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Johnson County, IL, Lawrence County, IL, Massac County, IL, Pope County, IL, Pulaski County, IL, Richland County, IL, Saline County, IL, Union County, IL, Wabash County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Clark County, IN, Crawford County, IN, Daviess County, IN, Dubois County, IN, Floyd County, IN, Gibson County, IN, Harrison County, IN, Knox County, IN, Lawrence County, IN, Martin County, IN, Orange County, IN, Perry County, IN, Pike County, IN, Posey County, IN, Scott County, IN, Spencer County, IN, Vanderburgh County, IN, Warrick County, IN, Washington County, IN, Adair County, KY, Allen County, KY, Anderson County, KY, Barren County, KY, Bourbon County, KY, Boyle County, KY, Breckinridge County, KY, Bullitt County, KY, Butler County, KY, Caldwell County, KY, Casey County, KY, Christian County, KY, Clark County, KY, Clay County, KY, Clinton County, KY, Crittenden County, KY, Cumberland County, KY, Daviess County, KY, Edmonson County, KY, Estill County, KY, Fayette County, KY, Franklin County, KY, Garrard County, KY, Grayson County, KY, Green County, KY, Hancock County, KY, Hardin County, KY, Hart County, KY, Henderson County, KY, Henry County, KY, Hopkins County, KY, Jackson County, KY, Jefferson County, KY, Jessamine County, KY, Knox County, KY, Larue County, KY, Laurel County, KY, Lee County, KY, Lincoln County, KY, Livingston County, KY, Logan County, KY, Lyon County, KY, Madison County, KY, Marion County, KY, Marshall County, KY, McCracken County, KY, McCreary County, KY, McLean County, KY, Meade County, KY, Mercer County, KY, Metcalfe County, KY, Monroe County, KY, Montgomery County, KY, Muhlenberg County, KY, Nelson County, KY, Ohio County, KY, Oldham County, KY, Owen County, KY, Owsley County, KY, Powell County, KY, Pulaski County, KY, Rockcastle County, KY, Russell County, KY, Scott County, KY, Shelby County, KY, Simpson County, KY, Spencer County, KY, Taylor County, KY, Todd County, KY, Trigg County, KY, Trimble County, KY, Union County, KY, Warren County, KY, Washington County, KY, Wayne County, KY, Webster County, KY, Whitley County, KY, Woodford County, KY, Clay County, TN, Fentress County, TN, Jackson County, TN, Macon County, TN, Montgomery County, TN, Overton County, TN, Pickett County, TN, Robertson County, TN, Scott County, TN, Smith County, TN, Sumner County, TN, Trousdale County, TN

The radar

The Louisville radar (KLVX), 59 km from the middle of the area, began a volume at 11:45 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 00:00Z, 11.7 hours before the alert went out and 282 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 2011-04-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 52 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 00:00Z on 2011-04-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 186 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
52 J/kg
Mixed-layer CIN
-101 J/kg
Mixed-layer LCL
899 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
186 m²/s²
0-3 km storm-relative helicity
352 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.5

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 9, 4:12 AM CDTMesoscale DiscussionSPCBond, Calhoun, Cass, Christian, Clark, Clay and 31 more93 min
Apr 9, 7:25 AM CDTSevere Thunderstorm WatchSPCEdwards, Gallatin, Hamilton, Hardin, Johnson, Massac and 6 more6 hr
Apr 8, 10:07 PM CDTSevere Thunderstorm WatchSPCBreathitt, Estill, Floyd, Knott, Lee, Letcher and 6 more6 hr
Apr 8, 11:42 PM CDTMesoscale DiscussionSPCKnott, Letcher, Perry93 min
Apr 9, 11:07 AM CDTMesoscale DiscussionSPCBath, Bell, Breathitt, Clark, Clay, Clinton and 25 more83 min
Apr 9, 11:34 AM CDTSevere Thunderstorm WatchSPCBath, Bell, Boyd, Breathitt, Carter, Clay and 30 more4 hr
Apr 9, 1:00 PM CDTTornado WatchSPCBell, Boyd, Breathitt, Carter, Clay, Elliott and 27 more7 hr
Apr 9, 2:23 AM CDTMesoscale DiscussionSPCCarter, Johnson, Sullivan67 min
Apr 9, 3:21 PM CDTMesoscale DiscussionSPCAnderson, Blount, Bradley, Campbell, Carter, Claiborne and 21 more84 min

Nearby

Mesoscale Discussions in Kentucky, 2011Mesoscale Discussions in Indiana, 2011Mesoscale Discussions in Illinois, 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.