Area Forecast Discussion
Issued by NWS Northern Indiana
Issued by NWS Northern Indiana
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168 FXUS63 KIWX 121840 AFDIWX Area Forecast Discussion National Weather Service Northern Indiana 240 PM EDT Wed Jun 12 2024 .KEY MESSAGES... - Chances severe storms late Thursday & Thursday evening with strong gusty winds and large hail. - Hot & humid Sunday through Wednesday; highs around 90 to 95 with afternoon heat indices 95 to possibly as high as 105. - After Thursday, storms will again be possible during the afternoons and evenings Sunday through Wednesday. && .DISCUSSION... Issued at 1233 PM EDT Wed Jun 12 2024 Surface high pressure stretching the length of the Appalachians will keep the region mostly dry through tonight. However, a progressive westerly flow aloft could bring another weak wave across the northern portion of the forecast area later this evening with a few showers or storms. Another disturbance will then move into Michigan around sunrise tomorrow, but is generally expected to remain north of the area. The bigger concern is a storm system developing over the great plains that will move in late tomorrow afternoon and evening. Wind shear will be favorable for organized linear convection with around 40 kts of bulk shear. Moisture and instability will also be on the rise with dewpoints in the mid 60s. The highest CAPE will be across northwest Indiana into southwest Michigan topping 2000 J/kg surface based. CAMs are in decent agreement bringing storms in from the Northwest as early as 4 PM EDT. SPC keeps a slight chance of severe storms across this area with the greatest threats being wind and hail, although cannot rule out a few isolated tornadoes. The severe threat should end before midnight when the convection then transitions into more of an MCS with a marginal risk of excessive rain. Upper level ridging starts to shift eastward from the plains on Friday and then builds on Saturday. It will therefore be warm and dry to start the weekend with highs in the low to mid 80s. Heat and humidity increases on Sunday and highs will be in the 90s. A shortwave could also bring some storms Sunday afternoon or evening. Moisture increases further on Monday with southerly flow, and heat indices will climb to near 100 degrees. Pop-up afternoon convection will also be possible. Similar conditions are expected on Tuesday and Wednesday. && .AVIATION /18Z TAFS THROUGH 18Z THURSDAY/... Issued at 1224 PM EDT Wed Jun 12 2024 No significant weather concerns through the TAF period with VFR conditions expected. An area of showers and thunderstorms, currently over central Minnesota, will drift east and south through time such that high clouds from this activity will be over KSBN later tonight, with clouds lingering through the morning. Showers and storms are expected to dissipate prior to reaching the TAF sites; medium-high confidence per high resolution guidance and an anticipated cap in place. && .IWX WATCHES/WARNINGS/ADVISORIES... IN...None. OH...None. MI...None. MARINE...None. && $$ DISCUSSION...Cobb AVIATION...Brown