Alert archive / Kentucky / Mesoscale Discussions in 2013

Mesoscale Discussion 2021

November 17, 20136 states

The Storm Prediction Center issued this mesoscale discussion at Nov 17, 2013, 2:43 PM CST for 6 states. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued
Nov 17, 2013, 2:43 PM CST (20:43 UTC)
Expired
Nov 17, 2013, 3:45 PM CST
In force
62 min
Issued by
the Storm Prediction Center
All 53 counties

Clay County, AR, Craighead County, AR, Greene County, AR, Alexander County, IL, Edwards 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, Wabash County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Gibson County, IN, Posey County, IN, Spencer County, IN, Vanderburgh County, IN, Warrick County, IN, Ballard County, KY, Caldwell County, KY, Calloway County, KY, Carlisle County, KY, Christian County, KY, Crittenden County, KY, Daviess County, KY, Fulton County, KY, Graves County, KY, Henderson County, KY, Hickman County, KY, Hopkins County, KY, Livingston County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, McLean County, KY, Trigg County, KY, Union County, KY, Webster County, KY, Dunklin County, MO, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, Scott County, MO, Stoddard County, MO, Dyer County, TN, Henry County, TN, Lake County, TN, Obion County, TN, Weakley County, TN

The radar

The Paducah radar (KPAH), 23 km from the middle of the area, began a volume at 20:43 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, 8.7 hours before the alert went out and 231 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 2013-11-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCLEL10008507005003002001001 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 2013-11-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 391 square meters per square second.1939587897117Sfc1 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
619 m above ground
0-6 km bulk shear
61 kt
0-1 km storm-relative helicity
391 m²/s²
0-3 km storm-relative helicity
476 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.

821 
ACUS11 KWNS 172043
SWOMCD
SPC MCD 172043 
KYZ000-INZ000-TNZ000-ILZ000-MOZ000-ARZ000-172145-

MESOSCALE DISCUSSION 2021
NWS STORM PREDICTION CENTER NORMAN OK
0243 PM CST SUN NOV 17 2013

AREAS AFFECTED...SWRN INDIANA...WRN KY...SRN IL...NWRN TN...FAR SERN
MO...NERN AR

CONCERNING...TORNADO WATCH 563...

VALID 172043Z - 172145Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 563 CONTINUES.

SUMMARY...THE TORNADO THREAT CONTINUES ACROSS TORNADO WATCH 563.

DISCUSSION...DURING THE NEXT HOUR OR SO...THE GREATEST TORNADO
THREAT WILL EXIST E OF ONGOING SUPERCELL CLUSTERS NEAR PADUCAH AND E
OF SHAWNEETOWN ILLINOIS. THESE CLUSTERS WILL MOVE RAPIDLY EWD AROUND
50-55 KT. EVANSVILLE AND PADUCAH VWP DATA INDICATE INTENSE LOW-LEVEL
SHEAR -- E.G. 0-1-KM BULK SHEAR AROUND 45-50 KT -- AMIDST MLCAPE
AROUND 500-1000 J/KG. ADEQUATE SPACING BETWEEN INDIVIDUAL UPDRAFTS
WILL MAINTAIN A SIGNIFICANT-TORNADO THREAT IN THE SHORT-TERM. THIS
WILL OCCUR AS THE SOUTHERN SUPERCELL CLUSTER AFFECTS AREAS NEAR AND
E OF PADUCAH AND THE NORTHERN SUPERCELL CLUSTER AFFECTS AREAS SOUTH
OF EVANSVILLE TOWARD OWENSBORO. FARTHER S ACROSS WW 563...ISOLATED
SEVERE STORM DEVELOPMENT CANNOT BE RULED OUT AS THE BAROCLINIC ZONE
CONSOLIDATES TO SOME EXTENT. HOWEVER...THE DEARTH OF MID-LEVEL
MOISTURE PER WATER VAPOR IMAGERY MAY PROVE TO BE DELETERIOUS FOR
UPDRAFT SUSTENANCE AMIDST ONLY MODEST LOW-LEVEL CONVERGENCE.

..COHEN.. 11/17/2013

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...LMK...OHX...IND...PAH...MEG...

LAT...LON   36129112 37168946 38468860 38498747 38068693 37078720
            36418806 35888928 35709056 36129112

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Nov 16, 11:29 PM CSTMesoscale DiscussionSPCBaxter, Clay, Cleburne, Fulton, Greene, Independence and 9 more61 min
Nov 17, 2:06 AM CSTMesoscale DiscussionSPCClay, Cleburne, Craighead, Crittenden, Cross, Greene and 15 more84 min
Nov 17, 10:17 AM CSTMesoscale DiscussionSPCClay, Fulton, Greene, Lawrence, Randolph, Sharp118 min
Nov 17, 10:43 AM CSTTornado WatchSPCClay, Craighead, Greene, Lawrence, Mississippi, Poinsett and 1 more8 hr
Nov 17, 11:57 AM CSTMesoscale DiscussionSPCClay, Greene, Lawrence, Randolph93 min
Nov 17, 3:46 PM CSTMesoscale DiscussionSPCCraighead, Mississippi89 min
Nov 17, 7:47 AM CSTMesoscale DiscussionSPCAdams, Bond, Brown, Bureau, Calhoun, Carroll and 55 more88 min
Nov 17, 8:40 AM CSTTornado Watch PDSSPCAdams, Bond, Boone, Brown, Bureau, Calhoun and 77 more7 hr
Nov 17, 10:49 AM CSTMesoscale DiscussionSPCBond, Boone, Bureau, Calhoun, Cass, Champaign and 56 more86 min
Nov 17, 11:57 AM CSTMesoscale DiscussionSPCChampaign, Coles, Cook, DeWitt, Douglas, DuPage and 11 more93 min
Nov 17, 1:05 PM CSTMesoscale DiscussionSPCAlexander, Hamilton, Johnson, Massac, Pope, Pulaski and 4 more55 min
Nov 17, 1:13 PM CSTMesoscale DiscussionSPCClark, Crawford, Edgar, Edwards, Jasper, Lawrence and 3 more77 min
Nov 17, 10:01 AM CSTMesoscale DiscussionSPCAdams, Allen, Bartholomew, Benton, Blackford, Boone and 56 more119 min
Nov 17, 10:20 AM CSTTornado Watch PDSSPCAdams, Allen, Bartholomew, Blackford, Boone, Brown and 65 more9 hr
Nov 17, 1:34 PM CSTMesoscale DiscussionSPCClark, Crawford, Floyd, Harrison, Perry, Washington56 min
Nov 17, 1:58 PM CSTTornado WatchSPCClark, Crawford, Dubois, Floyd, Harrison, Jefferson and 4 more6 hr
Nov 17, 2:51 PM CSTMesoscale DiscussionSPCAdams, Allen, Bartholomew, Blackford, Brown, Clay and 34 more84 min
Nov 17, 3:25 PM CSTTornado WatchSPCGreenup, Lewis, Mason, Robertson5 hr
Nov 17, 5:06 PM CSTMesoscale DiscussionSPCBracken, Campbell, Kenton, Mason54 min
Nov 17, 5:16 PM CSTMesoscale DiscussionSPCAdair, Bath, Boyd, Breathitt, Carter, Casey and 40 more59 min
Nov 16, 7:53 PM CSTMesoscale DiscussionSPCAdair, Andrew, Buchanan, Caldwell, Carroll, Chariton and 16 more67 min
Nov 17, 4:30 PM CSTTornado WatchSPCBenton, Cheatham, Davidson, Dickson, Houston, Humphreys and 5 more4 hr

Nearby

Mesoscale Discussions in Kentucky, 2013Mesoscale Discussions in Illinois, 2013Mesoscale Discussions in Missouri, 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; radar from the NEXRAD Level II archive.