HEADLINES
– Hot through the holiday weekend.
– Humidity increases Sunday. Heat Index by then in the upper 90s.
– Scattered showers and thunderstorms return to the forecast Sunday/Monday, and again Wednesday/Thursday.
TODAY’S MAP
NWS TECHNICAL DISCUSSION
A classic summertime weather pattern continues through the weekend for all of Central Indiana. While conditions are not expected to be as oppressive as they were last week, both humidity and temperatures will continue to rise over the next several days. The weather pattern becomes active again Sunday through next week as daily storm chances are back in the forecast. Strong ridging across the Central and Northern Plains slides eastward this weekend, resulting in a gradual warming and moistening trend as the core of the heat and humidity push closer to the state. Expect each day to be a few degrees warmer and more humid than the previous day in this pattern with highs reaching the lower 90s for the 4th of July and this weekend. Dew points may reach or exceed 70 degrees again, especially by Sunday, resulting in heat indices approaching the 100 degree mark again during the afternoon hours. Large-scale ridging begins to break down over the weekend with guidance consistently to show a weak trough and cold front approaching from the northwest on Sunday. Latest guidance has been more consistent regarding the timing of the approaching front and storms on Sunday, with the best threat for storms during the evening and into the nighttime hours. Confidence is high that much of Sunday will be hot and relatively dry, with the storm threat increasing from northwest to southeast the during the evening. At the moment, confidence is low on the severe threat with these storms as shear looks too weak to support widespread organization. With such a moist, unstable environment though, the possibility is there for any storm to briefly pulse up to severe levels before collapsing. The main threats will likely be brief periods of heavy rain, gusty winds, and lightning. Best threat for storms looks for be for the northern and western half of the state with convection significantly diminishing during the overnight hours. The pattern going into next week looks fairly typical for July with highs in the 80s, humid conditions, and additional storm chances. Keeping a chance of storms in for Monday as there is lower confidence on the timing of the aforementioned frontal passage. Tuesday could potentially be the driest day next week as longer range guidance and ensembles indicate a more active pattern setting up mid next week and beyond with more frequent precipitation chances... yet still warm and humid. && .AVIATION (12Z TAF Issuance)... Issued at 610 AM EDT Fri Jul 4 2025 Impacts: - VFR conditions expected throughout the forecast period Discussion: Surface high pressure and an expanding ridge aloft will continue to influence weather across the region with mainly clear skies and light southerly winds. Cirrus debris from convection across Wisconsin has made further progress south than originally thought and may drift across KLAF and possibly as far south as KHUF and KIND before diminishing later this morning. As with the previous few days... expect scattered diurnal cu to develop for this afternoon then dissipate towards sunset. Additional mid and high level clouds may drift south late day into the evening from convection over the Great Lakes but should largely stay north of the terminals.
INDY SEVEN DAY FORECAST
Independence Day: Mostly sunny, hot and humid. High 91.
Friday Night: Mostly clear. Low 71.
Saturday: Mostly sunny. High 92.
Saturday Night: Mostly clear. Low 72.
Sunday: Partly sunny. Scattered showers and storms, mainly in the afternoon. High 91.
Sunday Night: Scattered showers and storms. Low 71.
Monday: Partly to mostly cloudy. Scattered showers and storms. High 87.
Monday Night: Partly cloudy. Low 68.
Tuesday: Partly sunny. A little less humid. High 88.
Tuesday Night: Partly cloudy. Scattered showers after midnight. Low 68.
Wednesday: Partly to mostly cloudy. Scattered showers and storms. High 86.
Wednesday Night: Mostly cloudy. Scattered showers and storms. Low 67.
Thursday: Partly sunny, with scattered showers and storms. High 85.
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