Alert archive / Indiana / Mesoscale Discussions in 2012
Mesoscale Discussion 407
The Storm Prediction Center issued this mesoscale discussion at Apr 1, 2012, 4:42 PM EDT for 34 counties in Indiana; 9 counties in Ohio. It was in force for 93 min.
The area
The outline as issued.
The facts
- Issued
- Apr 1, 2012, 4:42 PM EDT (20:42 UTC)
- Expired
- Apr 1, 2012, 6:15 PM EDT
- In force
- 93 min
- Issued by
- the Storm Prediction Center
All 43 counties
Adams County, IN, Benton County, IN, Blackford County, IN, Boone County, IN, Carroll County, IN, Cass County, IN, Clinton County, IN, Delaware County, IN, Fayette County, IN, Fountain County, IN, Grant County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Henry County, IN, Howard County, IN, Huntington County, IN, Jasper County, IN, Jay County, IN, Madison County, IN, Marion County, IN, Miami County, IN, Montgomery County, IN, Newton County, IN, Randolph County, IN, Tippecanoe County, IN, Tipton County, IN, Union County, IN, Vermillion County, IN, Wabash County, IN, Warren County, IN, Wayne County, IN, Wells County, IN, White County, IN, Allen County, OH, Auglaize County, OH, Darke County, OH, Mercer County, OH, Miami County, OH, Montgomery County, OH, Preble County, OH, Shelby County, OH, Van Wert County, OH
The radar
The Indianapolis radar (KIND), 85 km from the middle of the area, began a volume at 20:48 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
Lincoln, IL (KILX), launched 12:00Z, 8.7 hours before the alert went out and 211 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
- 148 J/kg
- Mixed-layer CIN
- -287 J/kg
- Mixed-layer LCL
- 726 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 362 m²/s²
- 0-3 km storm-relative helicity
- 447 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 4.6
The text
As transmitted, in the capitals the NWS used until 2016.
685 ACUS11 KWNS 012042 SWOMCD SPC MCD 012042 OHZ000-INZ000-ILZ000-012215- MESOSCALE DISCUSSION 0407 NWS STORM PREDICTION CENTER NORMAN OK 0342 PM CDT SUN APR 01 2012 AREAS AFFECTED...ECNTRL IL...CNTRL IND...WCNTRL OH CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE VALID 012042Z - 012215Z LATEST VIS IMAGERY SUGGESTS DEEPER CONVECTIVE UPDRAFTS ARE DEVELOPING ACROSS ECNTRL IL INVOF IROQUOIS/VERMILION COUNTIES. THIS IS LIKELY INDICATIVE OF STRONG THERMAL HEATING AT LOW LEVELS AND STEEP LAPSE RATES. HOWEVER...FRONTAL CONVERGENCE SHOULD GRADUAL SAG SWD INTO THIS ZONE OF STEEPER LOW LEVEL LAPSE RATES WHICH SHOULD ENCOURAGE THUNDERSTORM DEVELOPMENT OVER THE NEXT FEW HOURS. THIS SCENARIO IS BECOMING INCREASINGLY LIKELY...THOUGH DEEP WLY FLOW MAY DELAY THE ONSET OF THUNDERSTORMS UNTIL 22-23Z TIME FRAME. DEEP LAYER SHEAR IS CERTAINLY SUPPORTIVE OF ORGANIZED UPDRAFTS THAT WOULD MOVE SEWD AT ROUGHLY 25-30KT. LATEST THINKING IS AN E-W CORRIDOR OF CONVECTION COULD EVOLVE ALONG THE FRONT INTO THE EARLY EVENING HOURS WHICH WOULD POSE AT LEAST A THREAT FOR LARGE HAIL AND DAMAGING WINDS. WILL CONTINUE TO MONITOR FOR POSSIBLE SEVERE THUNDERSTORM WATCH. ..DARROW.. 04/01/2012 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...ILN...IWX...IND...LOT...ILX... LAT...LON 41088765 40818390 39528390 39858762 41088765
Nearby
Mesoscale 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.