Alert archive / Kentucky / Mesoscale Discussions in 2011

Mesoscale Discussion 532

April 23, 2011Hardin County, Pope County, Illinois; 30 counties in Kentucky

The Storm Prediction Center issued this mesoscale discussion at Apr 23, 2011, 4:22 AM CDT for Hardin County, Pope County, Illinois; 30 counties in Kentucky. It was in force for 23 min.

The area

The outline as issued.

The facts

Issued
Apr 23, 2011, 4:22 AM CDT (09:22 UTC)
Expired
Apr 23, 2011, 4:45 AM CDT
In force
23 min
Issued by
the Storm Prediction Center
All 32 counties

Hardin County, IL, Pope County, IL, Anderson County, KY, Boyle County, KY, Breckinridge County, KY, Bullitt County, KY, Butler County, KY, Caldwell County, KY, Crittenden County, KY, Daviess County, KY, Edmonson County, KY, Fayette County, KY, Franklin County, KY, Grayson County, KY, Hardin County, KY, Hart County, KY, Hopkins County, KY, Jefferson County, KY, Jessamine County, KY, Larue County, KY, Livingston County, KY, Marion County, KY, McLean County, KY, Mercer County, KY, Muhlenberg County, KY, Nelson County, KY, Ohio County, KY, Shelby County, KY, Spencer County, KY, Washington County, KY, Webster County, KY, Woodford County, KY

The radar

The Louisville radar (KLVX), 68 km from the middle of the area, began a volume at 09:24 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 00:00Z, 9.4 hours before the alert went out and 166 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 00:00Z on 2011-04-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 719 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 00:00Z on 2011-04-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 185 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
719 J/kg
Mixed-layer CIN
-77 J/kg
Mixed-layer LCL
1368 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
185 m²/s²
0-3 km storm-relative helicity
309 m²/s²
Significant tornado parameter
0.4
Supercell composite
6.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

794 
ACUS11 KWNS 230923
SWOMCD
SPC MCD 230922
KYZ000-INZ000-ILZ000-230945-

MESOSCALE DISCUSSION 0532
NWS STORM PREDICTION CENTER NORMAN OK
0422 AM CDT SAT APR 23 2011

AREAS AFFECTED...SERN MO...SRN IL...SRN IND...SWRN OH...NRN KY

CONCERNING...SEVERE THUNDERSTORM WATCH 185...

VALID 230922Z - 230945Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 185
CONTINUES.

WW 185 WILL BE ALLOWED TO EXPIRE AT 10Z.

WHILE ISOLATED STRONG WIND GUSTS REMAIN POSSIBLE ACROSS PORTION OF
LINE MOVING THROUGH NRN THIRD OF KY...OVERALL THREAT IS BECOMING
INCREASINGLY MARGINAL AND ANOTHER WW DOES NOT APPEAR WARRANTED AT
THIS TIME.

..DIAL.. 04/23/2011

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

ATTN...WFO...LMK...PAH...

LAT...LON   37498860 37898635 38348538 38198453 37798433 37328554
            37058717 37038866 37498860

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 22, 7:31 PM CDTMesoscale DiscussionSPCAdams, Brown, Cass, Champaign, Christian, Clark and 22 more59 min
Apr 22, 9:20 PM CDTMesoscale DiscussionSPCAlexander, Clay, Clinton, Edwards, Franklin, Gallatin and 23 more55 min
Apr 23, 1:04 AM CDTTornado WatchSPCAlexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 14 more4 hr
Apr 23, 3:41 AM CDTMesoscale DiscussionSPCAlexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 10 more94 min
Apr 23, 1:04 PM CDTMesoscale DiscussionSPCAlexander, Gallatin, Hardin, Johnson, Massac, Pope and 2 more86 min
Apr 23, 2:30 PM CDTTornado WatchSPCHardin, Massac, Pope5 hr
Apr 23, 5:09 PM CDTMesoscale DiscussionSPCAlexander, Gallatin, Hardin, Jackson, Johnson, Massac and 5 more2 hr
Apr 23, 5:38 PM CDTSevere Thunderstorm WatchSPCAlexander, Johnson, Pulaski, Union6 hr
Apr 23, 10:51 AM CDTMesoscale DiscussionSPCAnderson, Bath, Boone, Bourbon, Boyd, Bracken and 43 more84 min
Apr 23, 2:56 PM CDTMesoscale DiscussionSPCBath, Bourbon, Boyd, Bracken, Carter, Clark and 14 more64 min
Apr 23, 3:39 PM CDTSevere Thunderstorm WatchSPCBoyd, Carter, Greenup, Lawrence4 hr
Apr 23, 6:35 PM CDTMesoscale DiscussionSPCAdair, Anderson, Barren, Bath, Bourbon, Boyle and 37 more55 min

Nearby

Mesoscale Discussions in Kentucky, 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.