Excessive Heat Watch is not only up for the entire viewing area, but the entire state of Indiana.
It has been upgraded to a Warning from Illinois to Kansas & Nebraska.
Thursday-Sunday will feature daily highs of 95-100 with lows 75-80. Daily indices will run 107-114.
This, after 86-92 today with heat indices 91-100 with a couple isolated showers/storms possible.
A couple isolated showers/storms are possible tonight with 70s as severe MCS or derecho rakes areas from Iowa to far western Kentucky & Tennessee. It will track on the edge of the worst of the heat wave in the "Ring of Fire".
Another complex of severe stors will blast the Dakotas & Minnesota to northeastern Iowa & Wisconsin to northwestern Illinois tonight-early tomorrow morning.
The MCSs outflow boundary/gust front will make it into the area tomorrow morning-midday.
This may pop a couple isolated storms despite capping increasing over the area with the intense heat.
Storms developing in the Dakotas &/or Minnesota Friday may develop into a progressive derecho that affects Wisconsin, Michigan, Ontario to New England Friday night to Saturday morning with a potentially significant, widespread damaging wind event.
We look completely dry & extremely capped & hot Friday.
A diffuse outflow boundary from this potential derecho will set up over our north Saturday, which may spark an isolated storm, despite capped environment.
In very hot, unstable environment, it appears that surface cold front will begin to accelerate southward Sunday as hot upper ridge flattens.
An MCS will already be over Iowa & northwestern Illinois Sunday morning & will tend to decay.
Its outflow boundary & MCV will likely re-develop new storms over eastern Illinois by early afternoon in +3000 J/kg ML CAPE environment with +2000 downdraft CAPE environment.
This may evolve into an organized, severe MCS with a squall line of damaging wind along the leading edge as it organizes & tracks from our area to Ohio, southern Indiana, Illinois to West Virginia & Kentucky back to Missouri.
It certainly looks SLIGHT RISK-worthy.
After a few showers in the morning, Monday looks partly cloudy, cooler & a bit less humid with highs near 87, followed by around 85 Tuesday & 83 Wednesday with mostly sunny to partly cloudy skies with lower humidity.
Overnight lows will be much more comfortable at around 60 followed by lows in the 50s!