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Forecast Discussion for Indianapolis, IN
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824 FXUS63 KIND 292320 AFDIND Area Forecast Discussion National Weather Service Indianapolis IN 720 PM EDT Fri Aug 29 2025 .KEY MESSAGES... - Dry and quiet weather for the weekend into early next week - Next chance for rain arrives Tuesday and continues into Thursday with another shot of cooler air behind a front && .SHORT TERM (This evening through Saturday)... Issued at 256 PM EDT Fri Aug 29 2025 Surface high pressure will be in control throughout the short term, leading to generally quiet and dry weather. However, a weak upper wave sliding through the broader scale cyclonic flow aloft overnight will likely lead to a bit of an increase in mid and high cloud, which may prevent ideal radiational cooling conditions - though cooling conditions will still be pretty good with fairly low dewpoints, dry ground, and dry northerly/northeasterly flow. Will go a bit below guidance in the upper 40s to mid 50s tonight. Some patchy fog cannot be ruled out near daybreak Saturday, primarily in areas where skies remain a bit clearer, or those that are sheltered or climatologically favorable, such as stream valleys, but confidence is far too low for a mention in the grids, especially given that dense fog is not particularly likely. Pleasant weather will continue Saturday, with highs rising into the mid 70s to around 80 across the area with continued low humidity and plentiful sunshine. && .LONG TERM (Saturday night through Friday)... Issued at 256 PM EDT Fri Aug 29 2025 Saturday night through Monday... High pressure at the surface will keep the weather quiet across central Indiana through the Labor Day weekend. Temperatures will moderate a bit, but highs will be near to a little below normal. Dry air and low cloud cover will allow temperatures to fall into the 50s for lows. Tuesday through Thursday... An inverted surface trough will drift into the area for Tuesday into early Wednesday, bringing a return of chances for rain. The trough will bring some moisture with it, but forcing and moisture aren`t impressive. Will keep PoPs in the chance category with the inverted trough. Later Wednesday into Thursday, a stronger upper trough will move southeast from Canada, with an accompanying surface cold front with a good shot of cool Canadian air behind it. There remain some questions on timing of the system, which will affect the timing of the highest PoPs. Right now it looks like later during the day Wednesday into Wednesday night. Temperatures will go from near normal on Tuesday to well below normal for Thursday, with highs on Thursday only in the 60s expected. Friday... High pressure should nudge into the area on Friday, bringing a return to dry weather. Temperatures in the 40s Friday morning should return to around 70 in the afternoon. && .AVIATION (00Z TAF Issuance)... Issued at 720 PM EDT Fri Aug 29 2025 Impacts: - Patchy fog possible late tonight Discussion: VFR conditions are forecast throughout the TAF period as high pressure to the north remains the dominant weather influence over surface conditions. Only aviation concern is the slight chance for patchy shallow fog near daybreak Saturday. Confidence is low in this occurring, with the best chance of fog at KBMG based on last night`s observation and a similar set up tonight. Brief periods of MVFR vis possible due to fog, but expect VFR conditions to return around sunrise. Winds will be below 10KT through the period, mostly northerly early, becoming easterly on Saturday, though periods of variable winds are likely as well. && .IND WATCHES/WARNINGS/ADVISORIES... None. && $$ SHORT TERM...Nield LONG TERM...50 AVIATION...CM |
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