FXUS63 KIWX 251040 AFDIWX Area Forecast Discussion National Weather Service Northern Indiana 640 AM EDT Sat Oct 25 2025 .KEY MESSAGES... - Cool and dry conditions will persist through early next week. - Light rain is possible during the middle and end of next week with temperatures remaining cool. && .DISCUSSION... Issued at 234 AM EDT Sat Oct 25 2025 High-amplitude ridging between bookend upper lows across New England and the Canadian Prairies will maintain high pressure and dry conditions over the Great Lakes through early next week. A weak shortwave does pass through the area later today but anything more than a stray sprinkle is unlikely given dry/stable airmass in place and overall weak forcing. Do expect a fair amount of mid/upper level clouds around today which will keep highs in the 50s despite some moderation of low level thermal profiles. Surface anticylcone remains locked over the Lower Great Lakes supplying our area with cool/dry easterly flow through early next week. This will keep highs in the 50s to around 60F with lows each night in the mid/upper 30s. Steady wind and marginal temps should prevent widespread frost but the growing season will likely be declared over for the rest of our counties anyway given recent widespread temps at or below 32F. 00Z guidance is still struggling with the evolution of a complex mid/upper pattern featuring three distinct upper lows for the middle and end of next week. Light rain is possible Tue night into Wed and possibly beyond as these upper lows pinwheel over the eastern CONUS. However, we still remain in a zone of cool/dry low level flow with best chances west and south. Did not deviate far from NBM PoP's but additional changes are likely in the coming days. Of somewhat higher confidence is the expectation that temps remain slightly on the cool side of climo. && .AVIATION /12Z TAFS THROUGH 12Z SUNDAY/... Issued at 636 AM EDT Sat Oct 25 2025 Some patchy shallow fog is being reported in regional observations this morning due to strong radiational cooling conditions. For the most part however, this is being manifested as mainly a frost setup with probability of vis restrictions at terminals remaining low early this morning. Otherwise, VFR conditions will persist this period. Some increase in mid level cloudiness is expected this morning due to elevated moisture advection working northeast into northern Indiana. A weak northern stream mid level trough will shut off this elevated moisture transport later today/this evening with decreasing mid/high clouds tonight. Eastward progression of low level ridge axis will result in light easterly flow today into tonight. && .IWX WATCHES/WARNINGS/ADVISORIES... IN...Freeze Warning until 9 AM EDT /8 AM CDT/ this morning for INZ005>009-012>015-017-018-020-022>027-032>034-103-104- 116-203-204-216. OH...Freeze Warning until 9 AM EDT this morning for OHZ001-002-004- 005-015-016-024-025. MI...None. MARINE...None. && $$ DISCUSSION...AGD AVIATION...Marsili