Alert archive / Indiana / Mesoscale Discussions in 2016
Mesoscale Discussion 520
The Storm Prediction Center issued this mesoscale discussion at May 1, 2016, 1:39 PM EDT for 39 counties in Indiana; 24 counties in Kentucky; 30 counties in Ohio. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- May 1, 2016, 1:39 PM EDT (17:39 UTC)
- Expired
- May 1, 2016, 3:45 PM EDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 40%
All 93 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, Gibson County, IN, Greene County, IN, Harrison County, IN, Jackson County, IN, Jefferson County, IN, Jennings County, IN, Johnson County, IN, Knox County, IN, Lawrence 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, Vanderburgh County, IN, Warrick County, IN, Washington County, IN, Wayne County, IN, Boone County, KY, Bracken County, KY, Breckinridge County, KY, Bullitt County, KY, Campbell County, KY, Carroll County, KY, Franklin County, KY, Gallatin County, KY, Grant County, KY, Hancock County, KY, Harrison County, KY, Henry County, KY, Jefferson County, KY, Kenton County, KY, Mason County, KY, Meade 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, Adams County, OH, Brown County, OH, Butler County, OH, Champaign County, OH, Clark County, OH, Clermont County, OH, Clinton County, OH, Darke County, OH, Delaware County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Greene County, OH, Hamilton County, OH, Highland County, OH, Hocking County, OH, Knox County, OH, Licking County, OH, Madison County, OH, Miami County, OH, Montgomery County, OH, Muskingum County, OH, Perry County, OH, Pickaway County, OH, Pike County, OH, Preble County, OH, Ross County, OH, Union County, OH, Vinton County, OH, Warren County, OH
The radar
The Indianapolis radar (KIND), 115 km from the middle of the area, began a volume at 17:39 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
Cncnati-Daytn, OH (KILN), launched 12:00Z, 5.7 hours before the alert went out and 123 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
- 196 J/kg
- Mixed-layer CIN
- -30 J/kg
- Mixed-layer LCL
- 619 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 109 m²/s²
- 0-3 km storm-relative helicity
- 91 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.5
The text
As transmitted.
823
ACUS11 KWNS 011739
SWOMCD
SPC MCD 011739
OHZ000-KYZ000-INZ000-ILZ000-011945-
MESOSCALE DISCUSSION 0520
NWS STORM PREDICTION CENTER NORMAN OK
1239 PM CDT SUN MAY 01 2016
AREAS AFFECTED...SRN IND...SRN OH THROUGH NRN KY
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 011739Z - 011945Z
PROBABILITY OF WATCH ISSUANCE...40 PERCENT
SUMMARY...THUNDERSTORMS ARE EXPECTED TO INCREASE IN COVERAGE AND
INTENSITY THIS AFTERNOON. A FEW OF THE STORMS COULD PRODUCE LARGE
HAIL AND DOWNBURST WINDS. TRENDS WILL CONTINUE TO BE MONITORED FOR
POSSIBLE WW.
DISCUSSION...EARLY THIS AFTERNOON A QUASI-STATIONARY FRONT EXTENDS
FROM NRN OH SWWD THROUGH SRN IND TO A SFC LOW IN SRN IL. A COLD
FRONT EXTENDS SWWD FROM THE LOW THROUGH SRN IL...AND ERN ARKANSAS.
WARM SECTOR HAS BECOME MODERATELY UNSTABLE WITH MLCAPE FROM 1000 TO
1500 J/KG. BASED ON THE 17Z RAOB FROM WILMINGTON OH...VERY LITTLE
CONVECTIVE INHIBITION REMAINS. STORMS HAVE ALREADY STARTED TO
DEVELOP ACROSS PARTS OF CNTRL OH...AND ADDITIONAL STORMS WILL
INITIATE FARTHER SW AS THE BOUNDARY LAYER CONTINUES TO DESTABILIZE.
UNIDIRECTIONAL WIND PROFILES WITH 40-50 KT EFFECTIVE BULK SHEAR WILL
SUPPORT MID-LEVEL UPDRAFT ROTATION AND STORMS SPLITS WITH LARGE HAIL
THE PRIMARY THREAT.
..DIAL/THOMPSON.. 05/01/2016
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...PBZ...RLX...CLE...ILN...LMK...IND...PAH...ILX...
LAT...LON 38978757 39698619 40318413 40558239 39878176 39048267
38088482 37678682 38088783 38978757SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 1, 2:36 PM EDT | Severe Thunderstorm Watch | SPC | Clark, Crawford, Dubois, Floyd, Gibson, Harrison and 12 more | 6 hr |
| May 1, 6:06 PM EDT | Mesoscale Discussion | SPC | Bartholomew, Benton, Blackford, Boone, Brown, Carroll and 42 more | 114 min |
| May 1, 6:48 PM EDT | Mesoscale Discussion | SPC | Clark, Crawford, Dubois, Floyd, Harrison, Jefferson and 9 more | 87 min |
| May 1, 7:58 PM EDT | Severe Thunderstorm Watch | SPC | Bartholomew, Boone, Brown, Carroll, Clay, Clinton and 33 more | 4 hr |
| May 1, 2:11 PM EDT | Mesoscale Discussion | SPC | Butler, Calloway, Christian, Logan, Muhlenberg, Todd and 1 more | 64 min |
| May 1, 3:59 PM EDT | Mesoscale Discussion | SPC | Boyd, Breathitt, Carter, Clay, Elliott, Floyd and 13 more | 61 min |
| May 1, 4:12 PM EDT | Severe Thunderstorm Watch | SPC | Bath, Boyd, Breathitt, Carter, Elliott, Estill and 20 more | 6 hr |
| May 1, 7:30 PM EDT | Mesoscale Discussion | SPC | Floyd, Knott, Martin, Pike | 60 min |
Nearby
Mesoscale Discussions in Indiana, 2016Mesoscale Discussions in Ohio, 2016Mesoscale Discussions in Kentucky, 2016Every mesoscale discussion in 2016
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.