Alert archive / Kentucky / Mesoscale Discussions in 2015

Mesoscale Discussion 217

April 7, 20154 states

The Storm Prediction Center issued this mesoscale discussion at Apr 7, 2015, 2:53 PM CDT for 4 states. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued
Apr 7, 2015, 2:53 PM CDT (19:53 UTC)
Expired
Apr 7, 2015, 4:30 PM CDT
In force
97 min
Issued by
the Storm Prediction Center
All 65 counties

Alexander County, IL, Edwards County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Jefferson County, IL, Johnson County, IL, Massac County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Randolph 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, Dubois County, IN, Floyd County, IN, Gibson County, IN, Harrison County, IN, Orange County, IN, Perry County, IN, Pike County, IN, Posey County, IN, Spencer County, IN, Vanderburgh County, IN, Warrick County, IN, Washington County, IN, Ballard County, KY, Breckinridge County, KY, Bullitt County, KY, Butler County, KY, Caldwell County, KY, Christian County, KY, Crittenden County, KY, Daviess County, KY, Grayson County, KY, Hancock County, KY, Hardin County, KY, Henderson County, KY, Hopkins County, KY, Jefferson County, KY, Livingston County, KY, Logan County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, McLean County, KY, Meade County, KY, Muhlenberg County, KY, Ohio County, KY, Oldham County, KY, Todd County, KY, Union County, KY, Webster County, KY, Bollinger County, MO, Cape Girardeau County, MO, Perry County, MO, Scott County, MO

The radar

The Evansville,IN radar (KVWX), 59 km from the middle of the area, began a volume at 19:52 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

Nashville Metro, TN (KBNA), launched 12:00Z, 7.9 hours before the alert went out and 233 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, Nashville Metro, TN at 12:00Z on 2015-04-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 593 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, Nashville Metro, TN at 12:00Z on 2015-04-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 179 square meters per square second.193958Sfc1 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
593 J/kg
Mixed-layer CIN
-48 J/kg
Mixed-layer LCL
594 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
179 m²/s²
0-3 km storm-relative helicity
160 m²/s²
Significant tornado parameter
0.4
Supercell composite
3.2

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 7, 8:17 AM CDTMesoscale DiscussionSPCBond, Clinton, Franklin, Hamilton, Jackson, Jefferson and 11 more88 min
Apr 7, 8:34 AM CDTSevere Thunderstorm WatchSPCClinton, Franklin, Jackson, Jefferson, Johnson, Madison and 7 more7 hr
Apr 7, 10:51 AM CDTMesoscale DiscussionSPCFranklin, Gallatin, Hamilton, Hardin, Jackson, Jefferson and 11 more54 min
Apr 7, 1:14 PM CDTMesoscale DiscussionSPCEdwards, Franklin, Gallatin, Hamilton, Hardin, Jackson and 7 more61 min
Apr 7, 1:37 PM CDTSevere Thunderstorm WatchSPCAlexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 10 more5 hr
Apr 7, 3:34 PM CDTMesoscale DiscussionSPCAnderson, Boyle, Bullitt, Edmonson, Franklin, Grayson and 13 more86 min
Apr 7, 5:34 PM CDTMesoscale DiscussionSPCBath, Bourbon, Boyle, Breathitt, Carter, Casey and 35 more56 min
Apr 7, 5:58 PM CDTSevere Thunderstorm WatchSPCBath, Breathitt, Clay, Elliott, Estill, Floyd and 17 more2 hr
Apr 7, 3:51 AM CDTMesoscale DiscussionSPCAudrain, Boone, Caldwell, Carroll, Chariton, Daviess and 9 more54 min
Apr 7, 5:03 PM CDTMesoscale DiscussionSPCBarton, Bates, Cass, Cedar, Dade, Greene and 9 more2 hr

Nearby

Mesoscale Discussions in Kentucky, 2015Mesoscale Discussions in Illinois, 2015Mesoscale Discussions in Indiana, 2015Every mesoscale discussion in 2015

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.