Today was an unusually cool day in that so many locations failed to reach 70. This is quite a feat in late July. To have multiple periods of low 70s or 70 in July is rare. Today’s 71 was unofficially the second coolest July 28 on record (since 1887) at West Lafayette.
After mostly clear skies & some patchy fog (lows 46-51…………..near/at record cool levels) Tuesday morning, cumulus will rapidly bubble up all over the sky. This is due to upper low moving back northwestward & several shortwaves pivoting around it into our area. With these, freezing levels will be low by July standards with a lot of cold air aloft. This, with the late July sun angle, will bubble up spotty showers & t’storms. Isolated hail is possible. Although most of these will diminish after dusk, another shortwave make spark a couple of showers even overnight Tuesday-early morning Wednesday in places.
Highs Tuesday will run 74-78. Lows of 55-59 are likely Tuesday night-Wednesday morning.