Select NOAA-NWS Forecast Office Text Products
(Product availability varies with seasons, forecast office, and weather.)
Forecast Discussion for Indianapolis, IN
To Select Another NWS Office Click on Map or Choose from List
![]() |
Select Forecast Office: | Select Product: |
471 FXUS63 KIND 290639 AFDIND Area Forecast Discussion National Weather Service Indianapolis IN 239 AM EDT Tue Jul 29 2025 .KEY MESSAGES... - Patchy fog this morning - Heat Advisory in effect through 8PM Tuesday - Greater storm chances Wednesday Night and Thursday with the potential for localized flooding. Isolated strong to severe wind gusts cannot be ruled out - Cooler temperatures and dry weather in store for end of week into the weekend && .SHORT TERM (Today and tonight)... Issued at 238 AM EDT Tue Jul 29 2025 Today. As of early this morning, fog coverage has been gradually increasing over the last couple of hours with coverage highest so far across the southern counties which saw periods of heavy rain yesterday. Hi- resolution models also key on other favored fog formation zones such as river valleys. Any fog will quickly burn off after daybreak with yet another hot and humid day in store across central Indiana as the ridge across the Ohio Valley persists. Precipitation chances will be minimal today with drier air aloft limiting the instability. This drier air aloft will also allow for better mixing out of surface humidity but with weak winds at the top of the boundary layer, this relief will be minimal. No changes planned to the ongoing Heat Advisory. Temperatures will have no issue rising into the low to potentially mid 90s. There is some uncertainty on the higher-end values of 105 or greater with the potential for lower afternoon dew points but with the length of this heat spell, impacts will be felt even if traditional criteria isn`t met. There were some discussions about an upgrade to an Extreme Heat Warning due to the aforementioned length of the recent heat, but with values likely on the low end of Advisory criteria today that the messaging wouldn`t match the impacts. Tonight. Another warm night will be in store for tonight with temperatures falling into the low to mid 70s with quiet weather continuing into the overnight hours. With the drier air both at the surface and just above the surface, the fog threat looks much lower for tonight even though conditions otherwise would be favorable with the near calm winds and mostly clear skies. && .LONG TERM (Wednesday through Monday)... Issued at 238 AM EDT Tue Jul 29 2025 Wednesday through Thursday... Changeable weather is expected during this time. The strong upper ridge across the area will begin to break down on Wednesday as a weak trough over the upper midwest sags toward Indiana. Much of Wednesday should remain, dry, hot and humid, but by Wednesday night, models suggest a cold front accompanying the trough sagging south across Indiana. Forecast soundings suggest the arrival of deep moisture overnight with pwats approaching 1.90 inches. Thus there is higher confidence for organized showers and storms on Wednesday Night into Thursday as these organized dynamics pass. Another hot day with highs in the 90s are expected ahead of the approaching front along with a warm and humid night. Thursday will be a transition day as the slow moving frontal boundary slowly sags southward, crossing the state. This should lead to abundant cloud cover along with cooler temperatures. Forecast soundings suggest that mid level subsidence fails to arrive until late in the day. Thus lingering morning showers will remain possible, with drying by late in the day. Thursday night through Sunday Night... A cooler, dry and fantastic weekend looks in store for this period. Models suggest sharp and strong ridging developing over the Rockies, allowing for northwest flow across the northern plains and into the Ohio Valley. This lee side flow will be favorable for subsidence through the weekend. This will generate a large surface high pressure system that will sink across the Great Lakes and dominate our weather through the weekend. Cooler northeast winds and Canadian air will bring a noticeable and much needed decrease in humidity. Highs through this period should be in the lower 80s with lows in the 60s, with partly cloudy skies. Monday... Chances for rain will be needed on Monday as the surface high is expected to drift east. This will allow for the development of warm and more humid southerly flow. Forecast soundings at the moment suggest at this time that diurnal convection will be possible amid this airmass. Thus for now, some chance pops are expected at that time. && .AVIATION (06Z TAF Issuance)... Issued at 1129 PM EDT Mon Jul 28 2025 Impacts: - MVFR/IFR fog possible overnight. - VFR Expected after 291400Z Discussion: Convection has exited south of the TAF sites. IR Imagery shows a cloud shield still lingering across the TAF sites, but this will be expected to dissipate over the next 1-2 hours. Very high dew points across the area along with recent rains at BMG will combine with clearing skies and light winds to result in FG or BR development tonight. Some IFR fog will be possible, especially at LAF and BMG. Fog will diminish quickly with mostly sunny skies expected Tuesday as high pressure and ridging aloft expands into the region. Subsidence aloft along with a mid level inversion and 700mb temps near 12C should prevent much convective growth. Thus VFR conditions with SCT CU will be expected. && .IND WATCHES/WARNINGS/ADVISORIES... Heat Advisory until 8 PM EDT this evening for INZ021-028>031- 035>049-051>057-060>065-067>072. && $$ SHORT TERM...White LONG TERM...Puma AVIATION...Puma |
Previous Forecast Discussions may be found at
NWS Indianapolis, IN (IND) Office Forecast Discussions.
(Click 'Previous Version' there to view past versions successively.
Some may differ only in time posted.)
Products Courtesy of NOAA-NWS
NWS Information Parsing Script by Ken True at Saratoga Weather - WFO and Products Scripts by SE Lincoln Weather.
Mapping by Curly at Michiana Weather and by Tom at My Mishawaka Weather.