Alert archive / Kentucky / Mesoscale Discussions in 2009
Mesoscale Discussion 939
The Storm Prediction Center issued this mesoscale discussion at Jun 3, 2009, 3:36 PM EDT for 5 counties in Indiana; 52 counties in Kentucky; 6 counties in Tennessee. It was in force for 54 min.
The area
The outline as issued.
The facts
- Issued
- Jun 3, 2009, 3:36 PM EDT (19:36 UTC)
- Expired
- Jun 3, 2009, 4:30 PM EDT
- In force
- 54 min
- Issued by
- the Storm Prediction Center
All 63 counties
Crawford County, IN, Floyd County, IN, Harrison County, IN, Perry County, IN, Spencer County, IN, Adair County, KY, Allen County, KY, Anderson County, KY, Barren County, KY, Boyle County, KY, Breckinridge County, KY, Bullitt County, KY, Butler County, KY, Caldwell County, KY, Casey County, KY, Christian County, KY, Clinton County, KY, Cumberland County, KY, Daviess County, KY, Edmonson County, KY, Franklin County, KY, Garrard County, KY, Grayson County, KY, Green County, KY, Hancock County, KY, Hardin County, KY, Hart County, KY, Henderson County, KY, Hopkins County, KY, Jefferson County, KY, Jessamine County, KY, Larue County, KY, Lincoln County, KY, Logan County, KY, Marion County, KY, McLean County, KY, Meade County, KY, Mercer County, KY, Metcalfe County, KY, Monroe County, KY, Muhlenberg County, KY, Nelson County, KY, Ohio County, KY, Oldham County, KY, Pulaski County, KY, Rockcastle County, KY, Russell County, KY, Shelby County, KY, Simpson County, KY, Spencer County, KY, Taylor County, KY, Todd County, KY, Trigg County, KY, Warren County, KY, Washington County, KY, Webster County, KY, Woodford County, KY, Cheatham County, TN, Macon County, TN, Montgomery County, TN, Robertson County, TN, Sumner County, TN, Trousdale County, TN
The radar
The Louisville radar (KLVX), 67 km from the middle of the area, began a volume at 19:39 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Nashville Metro, TN (KBNA), launched 12:00Z, 7.6 hours before the alert went out and 147 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.
- Mixed-layer CAPE
- 203 J/kg
- Mixed-layer CIN
- -109 J/kg
- Mixed-layer LCL
- 1110 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 83 m²/s²
- 0-3 km storm-relative helicity
- 77 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
ACUS11 KWNS 031937
SWOMCD
SPC MCD 031936
KYZ000-TNZ000-INZ000-032030-
MESOSCALE DISCUSSION 0939
NWS STORM PREDICTION CENTER NORMAN OK
0236 PM CDT WED JUN 03 2009
AREAS AFFECTED...PARTS OF CNTRL KY / FAR SRN IN / NRN MIDDLE TN
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 031936Z - 032030Z
SEVERE THREAT WILL PROBABLY INCREASE THIS AFTERNOON OVER PARTS OF
KENTUCKIANA AND PERHAPS AS FAR S AS N MIDDLE TN WITH THE STRONGER
STORMS POTENTIALLY BEING CAPABLE OF LARGE HAIL AND ISOLD DMGG WINDS.
A WW MAY BE NEEDED SOON.
LATEST RADAR MOSAIC SHOWS INTENSIFYING STORMS STRADDLING THE OHIO
RIVER FROM DAVIDSON COUNTY KY NEWD TO PERRY COUNTY IND. THESE
STORMS HAVE DEVELOPED S OF SLOWLY SWD SAGGING FRONTAL BOUNDARY IN
THE WARM MOIST SECTOR ON SRN FRINGE OF STRONG WLYS. EXPECTING STORM
ORGANIZATION TO CONTINUE WITH TIME THE NEXT FEW HOURS. THERE IS
UNCERTAINTY ON WHETHER STORMS WILL MAINTAIN A SEVERE THREAT AS THEY
ENCOUNTER MORE STABLE AIRMASS TO THE E NEAR THE I-75 CORRIDOR
RESULTANT FROM THIS MORNING/S MCS. ADEQUATE DEEP LAYER SHEAR
ACCORDING TO OBJECTIVE ANALYSIS /UP TO 35 KTS 0-6 KM SHEAR/ COUPLED
WITH A MODERATELY UNSTABLE AIRMASS /2000 J/KG SBCAPE/ WILL LIKELY
SUPPORT ORGANIZED STORMS IN THE FORM OF CLUSTERS WITH SUPERCELL
STRUCTURE AT TIMES...WITH LARGE HAIL AND DMGG WINDS POSSIBLE.
..SMITH.. 06/03/2009
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...JKL...LMK...OHX...PAH...
LAT...LON 37628791 38168691 38498581 38308491 37988443 37398416
36998430 36188661 36218750 36668804 37628791SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 2, 9:19 PM EDT | Mesoscale Discussion | SPC | Bartholomew, Brown, Clark, Crawford, Daviess, Dearborn and 35 more | 56 min |
| Jun 3, 12:12 PM EDT | Mesoscale Discussion | SPC | Bath, Boyd, Breathitt, Carter, Elliott, Estill and 11 more | 93 min |
| Jun 3, 3:57 PM EDT | Severe Thunderstorm Watch | SPC | Adair, Allen, Anderson, Barren, Boyle, Breckinridge and 37 more | 5 hr |
Nearby
Mesoscale Discussions in Kentucky, 2009Mesoscale Discussions in Tennessee, 2009Mesoscale Discussions in Indiana, 2009Every mesoscale discussion in 2009
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.