Forecast Chicago is the definitive portal for Chicagoland's weather and climate — built to make the official National Weather Service forecast fast, clean, and highway-clear across Cook County and the five collar counties, from the lakefront out to McHenry, Kane and Will.
Chicago's weather is a Great Lakes extreme: blizzards and lake-effect snow, the polar-vortex cold and dangerous wind chills, spring and summer severe storms and derechos, brutal summer heat waves, and the lakefront's own microclimate. Forecast Chicago is being built to tell that story — county by county, expressway by expressway.
The look borrows from the American Interstate system — the reflective paper, the green guide signs, the blue service signs, the brown recreation signs, and the red-white-and-blue route shields — set in Overpass. As a metro site its hero is the county grid rather than a state outline, in a Chicago-flag blue accent on cool steel-gray — its own note in the network.
Forecast Chicago is a metro zoom-in on Chicagoland — Cook County and the five collar counties at full detail. Forecast Illinois covers the other 96 counties, all the way down to Cairo, and its Zone 1 tile hands off to this site. Both are part of the wider Forecast <State> network.
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