While previous forecasts were more bullish on portions of Iowa seeing 100+ degree highs this week, the current forecast over the next two days has slightly "cooler" temperatures forecast. The trade off is that the humidity will be on the dramatic increase with heat index values above 100 degrees instead. So it is a good time to dust off the map showing year of last 100+ degree high temperature for the NWS long term / COOP sites tracked by the IEM. The map shows some micro-climate effects as some sites have not seen 100 degrees for over 20 years while others have had much more recent occurrences. Humidity levels play a roll in this map as local increases in humidity change the energy budget and effectiveness of daytime heating in warming the lower atmosphere.

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