455 FXUS63 KIND 052232 AFDIND Area Forecast Discussion National Weather Service Indianapolis IN 632 PM EDT Fri Jun 5 2026 .KEY MESSAGES... - Chances of showers/t-storms north of I-70 tonight - Additional widespread showers and storms possible Saturday afternoon through Saturday night - Very warm and humid starting Sunday, periods of showers/t-storms && .DISCUSSION (This evening through Friday)... Issued at 257 PM EDT Fri Jun 5 2026 The omega block pattern that has been persistent across the CONUS throughout the week has begun degrading over the last few days as an area of cyclonic vorticity works its way a-top the upper level ridge. This has shifted mean flow to out of the SW over the Mississippi Valley leading to a broad area of moisture return and instability. In return, diurnal MCSs have developed upstream of central Indiana leading to weak mid-level moisture advection and an increase in cloud cover over the last 12 hrs. The strong high pressure over the SE US is still influencing central Indiana weather today, keeping a majority of the moisture to our W and N. Still, a small portion of NW central Indiana will be close enough in proximity to the primary corridor of convective initiation for a few isolated showers and thunderstorms to pass through late this afternoon and evening. This SE CONUS high will slowly degrade and move eastward with time as moderate CVA continues on it western periphery, increasing moisture and instability throughout today and tonight. Eventually, this process will accelerate overnight ahead of a stronger low level vort max. The current expectation is for a 50-100 mile corridor of explosive convection across northern Indiana overnight along this low level vort max, of which will push to the SE as cold pooling develops. This should reach the Kokomo region between 10-13Z tomorrow, impacting the northern half of central Indiana throughout the morning. The main threat with tomorrow morning's storms will be isolated areas of organized convection along the passing cold pool leading to a few strong to severe wind gusts. Due to efficient rain rates and a somewhat parallel propagation vector to the corridor of forcing, a localized flood risk will also be present. The greater threat for flooding and severe weather is likely to be tomorrow afternoon and evening. The morning rainfall will work two- fold; establishing a weak low level boundary and increasing latent heat fluxes. This will maximize low level forcing and CAPE tomorrow afternoon across the northern half of the forecast area, leading to additional widespread convection. 12Z CAMs are in agreement on a narrow zone of 3000-4000 J/kg of SBCAPE, of which should lead to explosive updrafts capable of producing large hail and microbursts. The greater uncertainty resides on if these thunderstorms will encounter enough shear to become organized to produce a greater coverage of hazardous weather. The current thought is most thunderstorms should remain fairly unorganized and single-cellular, but there is some shear (around 20-25kt) of which may produce a few organized components. Flooding will also be a concern within these storms due to continued convection along a quasi-stationary boundary over a 12-15hr time period. Eventually, this boundary will sag southward Saturday night, but throughout Saturday afternoon and evening there is some potential for a quick 2-4 inches over small areas along and north of I-70. The synoptic pattern will remain similar for Sunday, with the quasi- stationary boundary settling along or south of the I-70 corridor, but the forcing and instability is not expected to be as high as Saturday. This will likely lead to isolated strong storms with an outside shot at damaging wind gusts and large hail. The main risk for Sunday will be localized flooding as these storms are also expected to be efficient rain producers and the threat for thunderstorms will be ongoing throughout the day. This wet/stormy pattern is expected to continue into the middle of next week as synoptic troughing works its way eastward pushing central Indiana into a martime-tropical airmass. There is some uncertainty on the timing of greater forcing, of which will fluctuate PoPs some, but in general there will be fairly continuous chances for storms Monday through Wednesday of next week. Its still too early to pinpoint any specific hazards. && .AVIATION (00Z TAF Issuance)... Issued at 632 PM EDT Fri Jun 5 2026 Impacts: - Isolated showers and storms tonight, mainly near LAF - Scattered showers and storms may impact KIND and KLAF Saturday morning and again late Saturday afternoon - MVFR ceilings possible at times Saturday Discussion: Isolated light showers continue to develop in the vicinity of KLAF early this evening but there will be no impacts over the next few hours. The deeper moisture plume remains displaced largely to the northwest of central Indiana which will keep convection north and west of the area for much of the night. Potential for showers and storms to impact KLAF in the predawn hours and possibly slip into the Indy metro around daybreak but confidence in convective evolution remains low and will continue to highlight with prob30s for Saturday morning. There is likely to be a lull in shower coverage late morning through mid afternoon before renewed development occurs in the vicinity of a nearly stationary frontal boundary over north central Indiana late Saturday into Saturday evening. KIND and KLAF will again be more likely to be impacted with most if not all convection remaining north of KBMG and KHUF. W/SW winds will gust to near 20kts at times Saturday afternoon. Sky cover remains tricky through much of the period and will depend on convective coverage. Anticipate VFR ceilings between 4000-10000 feet will prevail most of the time but there is potential for a gradual trend toward MVFR ceilings at times Saturday with increasing low level moisture. && .IND WATCHES/WARNINGS/ADVISORIES...None. && $$ AVIATION...Ryan DISCUSSION...Updike