Alert archive / Kentucky / Mesoscale Discussions in 2013

Mesoscale Discussion 484

April 16, 20135 states

The Storm Prediction Center issued this mesoscale discussion at Apr 16, 2013, 2:54 PM CDT for 5 states. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued
Apr 16, 2013, 2:54 PM CDT (19:54 UTC)
Expired
Apr 16, 2013, 4:30 PM CDT
In force
96 min
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 86 counties

Gallatin County, IL, Hardin County, IL, Johnson County, IL, Massac County, IL, Pope County, IL, Pulaski County, IL, Clark County, IN, Crawford County, IN, Dubois County, IN, Floyd County, IN, Harrison County, IN, Jefferson County, IN, Orange County, IN, Perry 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, Ballard County, KY, Barren County, KY, Breckinridge County, KY, Bullitt County, KY, Butler County, KY, Caldwell County, KY, Calloway County, KY, Carlisle County, KY, Christian County, KY, Crittenden County, KY, Cumberland County, KY, Daviess County, KY, Edmonson County, KY, Franklin County, KY, Fulton County, KY, Graves County, KY, Grayson County, KY, Green County, KY, Hancock County, KY, Hardin County, KY, Hart County, KY, Henderson County, KY, Henry County, KY, Hickman County, KY, Hopkins County, KY, Jefferson County, KY, Larue County, KY, Livingston County, KY, Logan County, KY, Lyon County, KY, Marion County, KY, Marshall County, KY, McCracken County, KY, McLean County, KY, Meade County, KY, Mercer County, KY, Metcalfe County, KY, Monroe County, KY, Muhlenberg County, KY, Nelson County, KY, Ohio County, KY, Oldham 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, Webster County, KY, Woodford County, KY, Mississippi County, MO, Henry County, TN, Houston County, TN, Montgomery County, TN, Obion County, TN, Robertson County, TN, Stewart County, TN, Sumner County, TN, Weakley County, TN

The watches that followed

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

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 7.9 hours before the alert went out and 320 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, Lincoln, IL at 12:00Z on 2013-04-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Lincoln, IL at 12:00Z on 2013-04-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 46 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
647 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
46 m²/s²
0-3 km storm-relative helicity
382 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
Apr 15, 8:59 PM CDTMesoscale DiscussionSPCMonroe61 min
Apr 16, 12:00 AM CDTSevere Thunderstorm WatchSPCBond, Brown, Calhoun, Cass, Christian, DeWitt and 19 more4 hr
Apr 16, 12:02 AM CDTMesoscale DiscussionSPCBond, Calhoun, Cass, Champaign, Christian, Coles and 21 more28 min
Apr 16, 12:56 PM CDTMesoscale DiscussionSPCDearborn, Franklin, Jefferson, Jennings, Ohio, Ripley and 2 more94 min
Apr 16, 2:42 PM CDTSevere Thunderstorm WatchSPCDearborn, Ohio, Switzerland7 hr
Apr 16, 5:01 PM CDTSevere Thunderstorm WatchSPCClark, Crawford, Dubois, Floyd, Harrison, Jefferson and 8 more6 hr
Apr 15, 10:13 PM CDTSevere Thunderstorm WatchSPCAudrain, Barton, Bates, Benton, Boone, Callaway and 38 more6 hr
Apr 16, 1:08 AM CDTMesoscale DiscussionSPCAudrain, Barton, Bates, Benton, Boone, Callaway and 38 more67 min

Nearby

Mesoscale Discussions in Kentucky, 2013Mesoscale Discussions in Indiana, 2013Mesoscale Discussions in Tennessee, 2013Every mesoscale discussion in 2013

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.