Area Forecast Discussion
Issued by NWS Northern Indiana
Issued by NWS Northern Indiana
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359 FXUS63 KIWX 301713 AFDIWX Area Forecast Discussion National Weather Service Northern Indiana 113 PM EDT Tue Apr 30 2024 .KEY MESSAGES... - Additional chances for showers and thunderstorms expected Friday. - Unseasonably warm through the week with highs generally in the 70s. && .DISCUSSION... Issued at 222 AM EDT Tue Apr 30 2024 Weak cold front through nw zones will wash ewd through daybreak with post frontal drying yielding pleasant wx into Thu. That said insolation/diurnal heating will bump mixed layer appreciably this aftn and tomorrow aftn with gusty west winds for a time. Rather chaotic and unsettled flow pattern up near the US/Canada border remains with next disturbance and associated jet streak progged to drive east out of the cntrl Rockies early Thu and through the upper midwest early Fri. Robust return flow ahead of this sys slated Thu although maximized west near the MS valley. Warm frontal zone extending ewd into the srn lakes lacking early on but a few showers or storms by late aftn west. Cold front tied to upper wave accelerating into Canada looks to push through Thu night with brief/flat ridging following into early Sat before return flow reemerges ahead of another fast moving wave ejecting a bit further south into the wrn lakes Sat aftn. Nrn track of both systems not ideal with swd dwindling frontal forcing noted which will limit overall rain chances here. More concerted area of high pressure noted through the lakes Sun-Mon. && .AVIATION /18Z TAFS THROUGH 18Z WEDNESDAY/... Issued at 110 PM EDT Tue Apr 30 2024 Low level ridge axis positioned west of the area this afternoon will continue to provide west northwest winds around 10 knots with a few gusts into the 15 to 18 knot range through around 21Z. After 21Z, gradual waning of diurnal mixing and weakening gradient with the approaching low level ridge will result in a brief period of light and variable winds this evening followed by onset of light south winds. This ridge will be quite progressive in nature allowing for south winds to increase into the 10 to 15 knot range late tonight with a fairly early onset of gusts to around 20 knots on Wednesday morning. Passage of this ridge axis will also mark the onset of some fairly substantial low-mid level moisture advection. The combination of this moisture advection and the possibility of a weak remnant convective vort max emanating from the Corn Belt could give rise a few isolated showers very late tonight across NW Indiana. Coverage of any shower activity should be limited and does not appear to warrant any mention in terminal forecasts at this time. Dry conditions persist into Wednesday with breezy conditions and southwest winds gusting to around 25 knots. In addition, there could be a very narrow temporal window for some LLWS criteria at KSBN toward daybreak, but feel this setup is marginal enough and of short enough duration to refrain from any mention at this time. && .IWX WATCHES/WARNINGS/ADVISORIES... IN...None. OH...None. MI...None. MARINE...None. && $$ DISCUSSION...T AVIATION...Marsili