Alert archive / Kentucky / Mesoscale Discussions in 2003

Mesoscale Discussion 586

April 25, 20035 counties in Illinois; 5 counties in Indiana; 39 counties in Kentucky

The Storm Prediction Center issued this mesoscale discussion at Apr 25, 2003, 6:29 PM CDT for 5 counties in Illinois; 5 counties in Indiana; 39 counties in Kentucky. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued: Apr 25, 2003, 6:29 PM CDT (23:29 UTC)
Expired: Apr 25, 2003, 8:00 PM CDT
In force: 91 min
Issued by: the Storm Prediction Center

All 49 counties

Gallatin County, IL, Hardin County, IL, Pope County, IL, Saline County, IL, White County, IL, Perry County, IN, Posey County, IN, Spencer County, IN, Vanderburgh County, IN, Warrick County, IN, Adair County, KY, Allen County, KY, Barren County, KY, Breckinridge County, KY, Bullitt County, KY, Butler County, KY, Caldwell County, KY, Christian County, KY, Crittenden County, KY, Cumberland County, KY, Daviess County, KY, Edmonson County, KY, Grayson County, KY, Green County, KY, Hancock County, KY, Hardin County, KY, Hart County, KY, Henderson County, KY, Hopkins County, KY, Larue County, KY, Livingston County, KY, Logan County, KY, Lyon County, KY, Marion County, KY, McLean County, KY, Meade County, KY, Metcalfe County, KY, Monroe County, KY, Muhlenberg County, KY, Nelson County, KY, Ohio County, KY, Simpson County, KY, Spencer County, KY, Taylor County, KY, Todd County, KY, Trigg County, KY, Union County, KY, Warren County, KY, Webster County, KY

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 11.5 hours before the alert went out and 158 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 3 J/kg
Mixed-layer CIN: -232 J/kg
Mixed-layer LCL: 656 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 279 m²/s²
0-3 km storm-relative helicity: 296 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.

000 
ACUS11 KWNS 252329
SWOMCD
SPC MCD 252329 
KYZ000-INZ000-ILZ000-260100-

MESOSCALE DISCUSSION 0586
NWS STORM PREDICTION CENTER NORMAN OK
0629 PM CDT FRI APR 25 2003

AREAS AFFECTED...WRN /WCNTRL KY

CONCERNING...TORNADO WATCH 169...

VALID 252329Z - 260100Z

STORMS CONTINUE TO WEAKEN IN INTENSITY IN MOST OF WW #169. WW WILL
LIKELY BE CANCELLED IN ADVANCE OF THE SCHEDULED EXPIRATION TIME OF
26/0200Z. 

RECENT VISIBLE/IR IMAGERY INDICATES MULTIPLE CELL DEVELOPMENT
CONTINUES TO EVOLVE IN SRN IL/WRN KY/AND EXTREME NWRN TN.
HOWEVER...WARMING CLOUD TOPS AND SHORT TOPPED CONVECTION IN THESE
AREAS REVEAL THAT STORMS ARE STRUGGLING DESPITE COOL 500MB
TEMPERATURES AROUND -18C. WITH MARGINAL INSTABILITY IN THE REGION /
50MB MIXED CAPES LESS THAN 500 J/KG / ...DEWPOINT VALUES ONLY FROM
THE MID 50S INTO THE LOWER 60S...AND WITH THE LOSS OF SURFACE
HEATING...EXPECT THE SEVERE THREAT TO CONTINUE TO DIMINISH OVER THE
NEXT HOUR OR SO.  

AN ISOLATED TORNADO THREAT CONTINUES WITH STORMS NEAR UPPER
LOW...WHICH IS LOCATED NEAR PAH. IN THE ERN/SERN PORTION OF THE
WW...GIVEN WET BULB ZERO LEVELS AROUND 7 KFT...VIA 18Z FCST
SOUNDINGS AND OBJECTIVE ANALYSIS READINGS...AN ISOLATED HAIL THREAT
WILL CONTINUE THE BE THE PRIMARY SEVERE THREAT FOR THE NEXT SEVERAL
HOURS.	

..NADEN.. 04/25/2003

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

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

36708811 37408878 37918878 38258765 38138520 36668521

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 25, 4:40 PM CDT	Tornado Watch	SPC	Gallatin, Hardin	4 hr
Apr 25, 11:04 AM CDT	Mesoscale Discussion	SPC	Caldwell, Calloway, Christian, Graves, Hopkins, Lyon and 4 more	116 min
Apr 25, 11:50 AM CDT	Severe Thunderstorm Watch	SPC	Adair, Allen, Barren, Butler, Caldwell, Calloway and 16 more	5 hr
Apr 25, 3:22 PM CDT	Mesoscale Discussion	SPC	Allen, Caldwell, Calloway, Christian, Livingston, Logan and 6 more	113 min

Nearby

Mesoscale Discussions in Kentucky, 2003 Mesoscale Discussions in Illinois, 2003 Mesoscale Discussions in Indiana, 2003 Every mesoscale discussion in 2003

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.