Alert archive / Kentucky / Mesoscale Discussions in 2012

Mesoscale Discussion 1617

July 26, 20126 states

The Storm Prediction Center issued this mesoscale discussion at Jul 26, 2012, 6:29 PM CDT for 6 states. It was in force for 61 min.

The area

The outline as issued.

The facts

Issued
Jul 26, 2012, 6:29 PM CDT (23:29 UTC)
Expired
Jul 26, 2012, 7:30 PM CDT
In force
61 min
Issued by
the Storm Prediction Center
All 38 counties

Clay County, AR, Alexander County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Johnson County, IL, Massac County, IL, Pope County, IL, Pulaski County, IL, Saline County, IL, Union County, IL, Williamson County, IL, Posey County, IN, Ballard County, KY, Caldwell County, KY, Calloway County, KY, Carlisle County, KY, Crittenden County, KY, Fulton County, KY, Graves County, KY, Henderson County, KY, Hickman County, KY, Livingston County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, Trigg County, KY, Union County, KY, Webster County, KY, Butler County, MO, Dunklin County, MO, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, Scott County, MO, Stoddard County, MO, Lake County, TN, Obion County, TN

The radar

The Paducah radar (KPAH), 50 km from the middle of the area, began a volume at 23:30 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

Little Rock, AR (KLZK), launched 12:00Z, 11.5 hours before the alert went out and 240 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, Little Rock, AR at 12:00Z on 2012-07-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2289 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, Little Rock, AR at 12:00Z on 2012-07-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -45 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
2289 J/kg
Mixed-layer CIN
-69 J/kg
Mixed-layer LCL
941 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
-45 m²/s²
0-3 km storm-relative helicity
-30 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
Jul 26, 1:44 PM CDTMesoscale DiscussionSPCBaxter, Boone, Carroll, Clay, Cleburne, Conway and 24 more3 hr
Jul 26, 5:27 PM CDTMesoscale DiscussionSPCClark, Clay, Cleburne, Conway, Craighead, Crittenden and 42 more33 min
Jul 26, 5:46 PM CDTSevere Thunderstorm WatchSPCClark, Clay, Cleburne, Conway, Craighead, Crawford and 45 more6 hr
Jul 25, 8:40 PM CDTMesoscale DiscussionSPCCarroll, Henry, Jo Daviess, Mercer, Rock Island, Stephenson and 1 more65 min
Jul 25, 8:57 PM CDTSevere Thunderstorm WatchSPCCarroll, Jo Daviess, Lee, Ogle, Rock Island, Stephenson and 2 more6 hr
Jul 25, 11:34 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, DeKalb, Henry, Jo Daviess and 7 more86 min
Jul 26, 1:40 AM CDTMesoscale DiscussionSPCBoone, Bureau, Cook, DeKalb, DuPage, Grundy and 15 more65 min
Jul 26, 12:09 PM CDTMesoscale DiscussionSPCBoone, McHenry2 hr
Jul 26, 1:25 PM CDTMesoscale DiscussionSPCAlexander, Bond, Clay, Clinton, Cumberland, Edwards and 27 more65 min
Jul 26, 1:46 PM CDTSevere Thunderstorm WatchSPCAlexander, Clark, Clay, Clinton, Crawford, Cumberland and 28 more10 hr
Jul 26, 3:55 PM CDTMesoscale DiscussionSPCAlexander, Clay, Clinton, Crawford, Edwards, Franklin and 24 more35 min
Jul 26, 11:26 AM CDTMesoscale DiscussionSPCBartholomew, Blackford, Brown, Clark, Clay, Crawford and 37 more2 hr
Jul 26, 12:16 PM CDTSevere Thunderstorm WatchSPCDearborn, Fayette, Franklin, Ohio, Ripley, Switzerland and 2 more9 hr
Jul 26, 2:37 PM CDTMesoscale DiscussionSPCBoone, Boyd, Bracken, Campbell, Carter, Fleming and 8 more113 min
Jul 26, 3:57 PM CDTMesoscale DiscussionSPCBath, Bourbon, Breathitt, Carter, Casey, Clark and 30 more2 hr
Jul 26, 5:06 PM CDTMesoscale DiscussionSPCBoyd, Greenup, Lewis84 min
Jul 26, 5:26 PM CDTSevere Thunderstorm WatchSPCBath, Boyd, Breathitt, Carter, Clay, Elliott and 24 more7 hr
Jul 25, 7:21 PM CDTMesoscale DiscussionSPCAtchison54 min

Nearby

Mesoscale Discussions in Kentucky, 2012Mesoscale Discussions in Illinois, 2012Mesoscale Discussions in Missouri, 2012Every mesoscale discussion in 2012

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.