Alert archive / Kentucky / Mesoscale Discussions in 2012
Mesoscale Discussion 697
The Storm Prediction Center issued this mesoscale discussion at May 4, 2012, 4:16 PM EDT for 25 counties in Indiana; 38 counties in Kentucky; Clermont County, Ohio. It was in force for 59 min.
The area
The outline as issued.
The facts
- Issued
- May 4, 2012, 4:16 PM EDT (20:16 UTC)
- Expired
- May 4, 2012, 5:15 PM EDT
- In force
- 59 min
- Issued by
- the Storm Prediction Center
All 64 counties
Clark County, IN, Crawford County, IN, Daviess County, IN, Dubois County, IN, Floyd County, IN, Gibson County, IN, Greene County, IN, Harrison County, IN, Jackson County, IN, Jefferson County, IN, Jennings County, IN, Knox County, IN, Lawrence County, IN, Martin County, IN, Ohio County, IN, Orange County, IN, Perry County, IN, Pike County, IN, Ripley County, IN, Scott County, IN, Spencer County, IN, Switzerland County, IN, Vanderburgh County, IN, Warrick County, IN, Washington County, IN, Anderson County, KY, Boone County, KY, Boyle County, KY, Breckinridge County, KY, Bullitt County, KY, Campbell County, KY, Carroll County, KY, Daviess County, KY, Franklin County, KY, Gallatin County, KY, Grant County, KY, Grayson County, KY, Hancock County, KY, Hardin County, KY, Harrison County, KY, Henderson County, KY, Henry County, KY, Jefferson County, KY, Jessamine County, KY, Kenton County, KY, Larue County, KY, Marion County, KY, McLean County, KY, Meade County, KY, Mercer County, KY, Nelson County, KY, Ohio County, KY, Oldham County, KY, Owen County, KY, Pendleton County, KY, Scott County, KY, Shelby County, KY, Spencer County, KY, Trimble County, KY, Union County, KY, Washington County, KY, Webster County, KY, Woodford County, KY, Clermont County, OH
The radar
The Louisville radar (KLVX), 62 km from the middle of the area, began a volume at 20:17 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 12:00Z, 8.3 hours before the alert went out and 245 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
- 476 J/kg
- Mixed-layer CIN
- -12 J/kg
- Mixed-layer LCL
- 540 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 88 m²/s²
- 0-3 km storm-relative helicity
- 44 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
243 ACUS11 KWNS 042017 SWOMCD SPC MCD 042016 KYZ000-OHZ000-INZ000-ILZ000-042115- MESOSCALE DISCUSSION 0697 NWS STORM PREDICTION CENTER NORMAN OK 0316 PM CDT FRI MAY 04 2012 AREAS AFFECTED...SRN IND...NWRN KY CONCERNING...SEVERE THUNDERSTORM WATCH 238... VALID 042016Z - 042115Z THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 238 CONTINUES. SUMMARY...FAST-MOVING BOW ECHO WILL RACE ACROSS SRN IND INTO THE LOUISVILLE KY METRO AREA. DAMAGING WINDS AND HAIL ARE POSSIBLE WITH THIS ACTIVITY. DISCUSSION...WELL DEFINED BOW ECHO...CURRENTLY LOCATED FROM ORANGE/CRAWFORD COUNTIES IN SRN IND...IS BEGINNING TO SURGE ESEWD AT ROUGHLY 45KT. THIS COMPACT CLUSTER OF STORMS WILL SOON MOVE INTO THE LOUISVILLE KY METRO AREA WITH A THREAT FOR DAMAGING WINDS AND HAIL. OTHER ISOLATED STORMS ARE ATTEMPTING TO FORM AHEAD OF THIS BOW OVER SERN IND BUT THE PRIMARY SEVERE THREAT IN THE SHORT TERM WILL BE WITH THE SURGING BOW ECHO. ..DARROW.. 05/04/2012 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...ILN...LMK...IND...PAH...ILX... LAT...LON 39108741 39118404 37468476 37458804 39108741
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 3, 11:29 PM EDT | Mesoscale Discussion | SPC | Benton, Jasper, Lake, Newton, Porter | 61 min |
| May 4, 12:34 AM EDT | Severe Thunderstorm Watch | SPC | Benton, Jasper, Newton | 5 hr |
| May 4, 3:16 AM EDT | Mesoscale Discussion | SPC | Benton, Jasper, Newton, Pulaski, White | 119 min |
| May 4, 12:36 PM EDT | Mesoscale Discussion | SPC | Clark, Crawford, Daviess, Dubois, Floyd, Gibson and 11 more | 84 min |
| May 4, 2:29 PM EDT | Severe Thunderstorm Watch | SPC | Bartholomew, Brown, Clark, Crawford, Daviess, Dearborn and 25 more | 5 hr |
| May 4, 7:52 PM EDT | Mesoscale Discussion | SPC | Boone, Delaware, Fayette, Franklin, Hamilton, Hancock and 12 more | 53 min |
| May 4, 1:26 PM EDT | Mesoscale Discussion | SPC | Trumbull | 2 hr |
Nearby
Mesoscale Discussions in Kentucky, 2012Mesoscale Discussions in Indiana, 2012Mesoscale Discussions in Ohio, 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.