


Area Forecast Discussion
Issued by NWS Northern Indiana
Issued by NWS Northern Indiana
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055 FXUS63 KIWX 020802 AFDIWX Area Forecast Discussion National Weather Service Northern Indiana 402 AM EDT Wed Apr 2 2025 .KEY MESSAGES... - Showers and a few thunderstorms this morning will become more numerous this afternoon and evening. A few storms this morning could contain small hail. - Enhanced Risk of severe thunderstorms this afternoon and evening. All severe hazards are possible including damaging winds, large hail, and tornadoes, especially along and south of the US 24 corridor. - Windy outside of any showers and storms, with gusts to 35 mph. && .DISCUSSION... Issued at 122 AM EDT Wed Apr 2 2025 Near term, dvlpg convection acrs cntrl IL will expand northeastward through daybreak in response to continued/sharp low level moisture advection. In time, overspread of better low level theta-e ridge beneath at least modest mid lvl lapse rates will promote some small hail risk with elevated storms within nwd advancing srn flank of storms later this morning. Focus then turns to potentially more active period this evening. Severe risk remains conditional owing to debris cloud cover, morning convective overturning, poor mid lvl lapse rates and limited low level theta-e plume. Exception lies south of US24 where more vigorous diurnal heating is likely to occur and generally removed from any spoiler morning storms and where better overlap of the parameter space for supercells exists. Regardless volatile kinematic env in place by evening with extreme 0-3km shear present as denoted in all cam based hodographs warrants much caution this evening. Otherwise cold frontal boundary sweeps through the area this evening downstream of intense cyclone lifting through the upper midwest. Mid lvl dryslot and mixing will promote a mild and windy day Thu post frontal. Sfc boundary stalls down near the OH river late Thu in response to primary upper trough hanging back over the desert southwest. This pronounced wave will eject out into the srn plains Sat and mix frontal zone back north into the OH valley late Fri-late Sat with likely several rounds of deep convection and some flood risk in at least far srn zones. More pronounced mean troughing dvlps thereafter through ern Canada which in turn yields much cooler wx next week with showers at times as a series of upper disturbances drop down through amplifying ern NOAM flow. && .AVIATION /06Z TAFS THROUGH 06Z THURSDAY/... Issued at 142 AM EDT Wed Apr 2 2025 Confidence in flight impacts from anticipated area of showers and a few storms through 15Z Wed or so is low. A lot of dry air needs to be overcome and convection will be elevated in nature. Have made some adjustments at both location to time out peak window for greatest coverage with the warm front. Have also backed off on the much lower cigs for now near/south of the warm front as we await the main front and risk for stronger storms after 22Z. More fine tuning will be needed over the next 6 to 12 hours as we get a better handle on the evolution of the storms. LLWS will ramp up overnight and persist much of the day. && .IWX WATCHES/WARNINGS/ADVISORIES... IN...None. OH...None. MI...None. MARINE...Gale Warning until 7 PM EDT this evening for LMZ043-046. && $$ DISCUSSION...T AVIATION...Fisher