Snapshots are taken automatically at 3:01 AM and 3:01 PM Central, one minute after NWS's two daily forecast revisions. Cells are shaded by the delta vs the previous snapshot — red = warmer/drier, blue = cooler/wetter.
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Markets react to changes in the forecast, not just the forecast itself. This page compares the latest National Weather Service forecast with the previous one for towns across the Corn Belt and highlights what got wetter, drier, warmer or cooler.