Alert archive / Kentucky / Mesoscale Discussions in 2012
Mesoscale Discussion 709
The Storm Prediction Center issued this mesoscale discussion at May 5, 2012, 12:55 AM CDT for 7 counties in Illinois; 7 counties in Indiana; 25 counties in Kentucky. It was in force for 95 min.
The area
The outline as issued.
The facts
- Issued
- May 5, 2012, 12:55 AM CDT (05:55 UTC)
- Expired
- May 5, 2012, 2:30 AM CDT
- In force
- 95 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 60%
All 39 counties
Edwards County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Saline County, IL, Wabash County, IL, White County, IL, Gibson County, IN, Perry County, IN, Pike County, IN, Posey County, IN, Spencer County, IN, Vanderburgh County, IN, Warrick County, IN, Adair County, KY, Breckinridge County, KY, Bullitt County, KY, Butler County, KY, Casey 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, Marion County, KY, McLean County, KY, Meade County, KY, Muhlenberg County, KY, Nelson County, KY, Ohio County, KY, Taylor County, KY, Union County, KY, Washington County, KY, Webster County, KY
The radar
The Louisville radar (KLVX), 81 km from the middle of the area, began a volume at 05:57 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 00:00Z, 5.9 hours before the alert went out and 177 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
- 1078 J/kg
- Mixed-layer CIN
- -70 J/kg
- Mixed-layer LCL
- 1542 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 2 m²/s²
- 0-3 km storm-relative helicity
- 111 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.6
The text
As transmitted, in the capitals the NWS used until 2016.
875
ACUS11 KWNS 050555
SWOMCD
SPC MCD 050555
KYZ000-INZ000-ILZ000-050730-
MESOSCALE DISCUSSION 0709
NWS STORM PREDICTION CENTER NORMAN OK
1255 AM CDT SAT MAY 05 2012
AREAS AFFECTED...SERN IL...SRN IN...NWRN KY
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 050555Z - 050730Z
PROBABILITY OF WATCH ISSUANCE...60 PERCENT
SUMMARY...STORMS SHOULD PERSIST OVER MUCH OF THE AREA...WITH A
THREAT OF DAMAGING WIND GUSTS AND MARGINAL HAIL.
DISCUSSION...SEVERAL CLUSTERS OF STORMS WERE ONGOING FROM SRN IL
INTO CNTRL KY. OUTFLOW FROM THE CNTRL/ERN KY STORMS CURRENTLY TRAILS
WWD ALONG OR JUST N OF THE OH RIVER AND ACROSS SWRN IND. AMPLE
MOISTURE AND INSTABILITY EXIST S OF THE BOUNDARY AND WSWLY LOW LEVEL
FLOW WILL MAINTAIN A FAVORABLE FLUX INTO THE DEVELOPING STORMS.
INDICATIONS ARE THAT THE IL STORMS MAY PERSIST SEWD ALONG THE
BOUNDARY WITH A WIND THREAT. THIS ENTIRE AREA IS BEING HELPED ALONG
BY WEAK MIDLEVEL SPEED MAX WITH 30-35 KT FLOW HELPING TO PUSH STORMS
ALONG AND CREATE ENOUGH DEEP SHEAR FOR FORWARD PROPAGATION. HIGH
PWAT ENVIRONMENT WILL FURTHER OUTFLOW PRODUCTION.
..JEWELL.. 05/05/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LMK...IND...PAH...
LAT...LON 37098611 37268752 37538843 37918873 38308857 38528800
38478722 38028597 37938516 37388481 37108506 37098611SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 4, 7:57 PM CDT | Mesoscale Discussion | SPC | Bond, Calhoun, Christian, Clay, Clinton, Crawford and 25 more | 63 min |
| May 4, 10:18 PM CDT | Mesoscale Discussion | SPC | Bond, Calhoun, Clinton, Franklin, Greene, Hamilton and 11 more | 87 min |
| May 4, 10:35 PM CDT | Severe Thunderstorm Watch | SPC | Bond, Calhoun, Clinton, Edwards, Fayette, Franklin and 24 more | 8 hr |
| May 5, 5:06 AM CDT | Mesoscale Discussion | SPC | Gallatin, Hardin, White | 114 min |
| May 5, 2:49 AM CDT | Severe Thunderstorm Watch | SPC | Posey, Spencer, Vanderburgh, Warrick | 4 hr |
Nearby
Mesoscale Discussions in Kentucky, 2012Mesoscale Discussions in Illinois, 2012Mesoscale Discussions in Indiana, 2012Every 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.