Area Forecast Discussion
Issued by NWS Northern Indiana
Issued by NWS Northern Indiana
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078 FXUS63 KIWX 051017 AFDIWX Area Forecast Discussion National Weather Service Northern Indiana 617 AM EDT Sat Jul 5 2025 .KEY MESSAGES... - Hot and humid today and Sunday. Highs around 90 with heat indices around 90 to the mid 90s. - Frequent chances for showers and thunderstorms this upcoming week starting Sunday. - Seasonally warm this upcoming workweek with highs in the 80s. && .DISCUSSION... Issued at 1257 AM EDT Sat Jul 5 2025 An upper ridge will continue to keep very warm conditions over the forecast area through this weekend. High temperatures today and Sunday will generally be in the lower 90s with heat indices at some locations in northwest Ohio and south of Ft Wayne approaching the upper 90s. Will continue to mention these high heat indices in the Hazardous Weather Outlook, but will not issue a Heat Advisory at this time. Highs will be in the 80s this upcoming week with heat indices in the 80s to lower 90s. Very stable mid level lapse rates (4.5C to 5.0C/Km) along with a sizable low level cap will be over the forecast area today and will make it difficult for storms to fire, so have kept storms out of the forecast for today. A weak cold front will arrive Sunday and reach a very moist airmass over northern Indiana with precipitable water values around 2.0 inches. Weak low level flow and a tall and thin CAPE generally less than 1000 J/Kg will provide an environment for heavy downpours. Given the antecedently dry conditions and some storm movement, widespread flooding is not expected, but local flooding is possible. Temperatures will be near to a little above normal this upcoming week with highs in the mid to upper 80s. Diurnal type (afternoon heating) thunderstorms become more favorable Wednesday through Friday afternoon && .AVIATION /12Z TAFS THROUGH 12Z SUNDAY/... Issued at 615 AM EDT Sat Jul 5 2025 With ridging in place over the region, VFR conditions expected through this TAF period. There will be gusty southwest winds up to around 20 kts for KSBN between 17z Sat through Sun 00z. && .IWX WATCHES/WARNINGS/ADVISORIES... IN...None. OH...None. MI...Air Quality Alert until midnight EDT tonight for MIZ177-277. MARINE...None. && $$ DISCUSSION...Skipper AVIATION...Andersen