Alert archive / Kentucky / Mesoscale Discussions in 2012

Mesoscale Discussion 1355

July 1, 201235 counties in Indiana; 39 counties in Kentucky; 4 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Jul 1, 2012, 9:02 PM EDT for 35 counties in Indiana; 39 counties in Kentucky; 4 counties in Ohio. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued: Jul 1, 2012, 9:02 PM EDT (01:02 UTC)
Expired: Jul 1, 2012, 10:00 PM EDT
In force: 58 min
Issued by: the Storm Prediction Center

All 78 counties

Bartholomew County, IN, Brown County, IN, Clark County, IN, Crawford County, IN, Daviess County, IN, Dearborn County, IN, Decatur County, IN, Dubois County, IN, Fayette County, IN, Floyd County, IN, Franklin County, IN, Greene County, IN, Harrison County, IN, Jackson County, IN, Jefferson County, IN, Jennings County, IN, Johnson County, IN, Lawrence County, IN, Marion County, IN, Martin County, IN, Monroe County, IN, Morgan County, IN, Ohio County, IN, Orange County, IN, Owen County, IN, Perry County, IN, Pike County, IN, Ripley County, IN, Rush County, IN, Scott County, IN, Shelby County, IN, Spencer County, IN, Switzerland County, IN, Union County, IN, Washington County, IN, Anderson County, KY, Boone County, KY, Bourbon County, KY, Boyle County, KY, Bracken County, KY, Breckinridge County, KY, Bullitt County, KY, Campbell County, KY, Carroll County, KY, Fayette County, KY, Franklin County, KY, Gallatin County, KY, Grant County, KY, Grayson County, KY, Hancock County, KY, Hardin County, KY, Harrison County, KY, Henry County, KY, Jefferson County, KY, Jessamine County, KY, Kenton County, KY, Larue County, KY, Marion County, KY, Mason County, KY, Meade County, KY, Mercer County, KY, Nelson County, KY, Nicholas County, KY, Ohio County, KY, Oldham County, KY, Owen County, KY, Pendleton County, KY, Robertson County, KY, Scott County, KY, Shelby County, KY, Spencer County, KY, Trimble County, KY, Washington County, KY, Woodford County, KY, Brown County, OH, Butler County, OH, Clermont County, OH, Hamilton County, OH

The radar

The Louisville radar (KLVX), 89 km from the middle of the area, began a volume at 01:05 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

Cncnati-Daytn, OH (KILN), launched 00:00Z, 1.0 hours before the alert went out and 168 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: 4 J/kg
Mixed-layer CIN: -493 J/kg
Mixed-layer LCL: 2194 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: -208 m²/s²
0-3 km storm-relative helicity: -22 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.8

Open this sounding in Storm Lab

The text

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

707 
ACUS11 KWNS 020103
SWOMCD
SPC MCD 020102
KYZ000-OHZ000-INZ000-020200-

MESOSCALE DISCUSSION 1355
NWS STORM PREDICTION CENTER NORMAN OK
0802 PM CDT SUN JUL 01 2012

AREAS AFFECTED...SWRN OH...NWRN KY...SRN IND

CONCERNING...SEVERE THUNDERSTORM WATCH 448...

VALID 020102Z - 020200Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 448
CONTINUES.

SUMMARY...THE THREAT FOR SVR STORMS CONTINUES ACROSS WW 448...AND
MAY EXTEND NWD INTO PARTS OF CNTRL IND.

DISCUSSION...AN ORGANIZING LINE OF STRONG TO SVR STORMS FROM JUST
SOUTH OF TERRE HAUTE IND TO NORTH OF LOUISVILLE KY WILL POSE A
THREAT FOR SVR WINDS/HAIL AS ENEWD/EWD PROPAGATION OCCURS OWING TO
MODEST ENELY/ELY INFLOW OF EXTREMELY UNSTABLE AIR. THIS WILL SUPPORT
A CONTINUED SVR THREAT ACROSS NWRN PARTS OF THE WW AREA DURING THE
NEXT COUPLE OF HOURS. THIS WILL ALSO SUPPORT A SVR THREAT INTO PARTS
OF CNTRL IND. HOWEVER...WITH INCREASING INHIBITION OWING TO
NOCTURNAL COOLING...AND GIVEN THE JUXTAPOSITION OF THE ANTICIPATED
CONVECTION WITH ONLY MODEST MID-LEVEL FLOW...THE GENERALLY BRIEF SVR
THREAT WILL BE ISOLATED. THUS...A NEW WW IS NOT WARRANTED ACROSS
PARTS OF CNTRL IND. ADDITIONAL STORMS DEVELOPING NEAR AND JUST
BEHIND AN OUTFLOW BOUNDARY EXTENDING EAST OF THE LOUISVILLE AREA
WILL POSE A SVR THREAT AS THEY APPROACH CNTRL KY DURING THE NEXT
COUPLE OF HOURS AMIDST STRONG INSTABILITY.

..COHEN.. 07/02/2012

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

ATTN...WFO...JKL...ILN...LMK...IND...PAH...

LAT...LON   38558354 37558492 37388680 38178731 38748729 39388692
            39808612 39638472 39148376 38558354

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 2, 6:16 PM EDT	Mesoscale Discussion	SPC	Clay, Crawford, Daviess, Dubois, Gibson, Greene and 13 more	2 hr
Jul 1, 8:21 PM EDT	Mesoscale Discussion	SPC	Boyd, Carter, Greenup, Lawrence	54 min
Jul 1, 8:32 PM EDT	Mesoscale Discussion	SPC	Floyd, Knott, Leslie, Letcher, Magoffin, Perry and 1 more	88 min
Jul 1, 9:06 PM EDT	Severe Thunderstorm Watch	SPC	Breathitt, Estill, Floyd, Harlan, Knott, Lee and 5 more	5 hr
Jul 1, 10:26 PM EDT	Mesoscale Discussion	SPC	Adair, Anderson, Bath, Bourbon, Boyd, Boyle and 46 more	94 min

Nearby

Mesoscale Discussions in Kentucky, 2012 Mesoscale Discussions in Indiana, 2012 Mesoscale Discussions in Ohio, 2012 Every 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.