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Date of Coldest Temp

28 Jan 2021 05:42 AM
The featured map presents the date so far this season that a given grid point had its coldest air temperature based on hourly NCEP RTMA data. For some parts of Iowa, this morning's temperatures are the coldest so far this season with values finally below zero for the first time for some locations. Locations plotted in the gray color would indicate this morning's temperatures being the coldest of the season. Other locations, particularly in western Iowa, are a bit warmer with southerly flow on the backside of the surface high pressure system helping to buoy temperatures. The featured map will be updated later this morning once the rest of this morning's data arrives.

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2017 Temperature Range

01 Jan 2018 05:59 AM
The featured map displays the difference between the warmest and coldest temperature based on hourly high-resolution analysis produced by the Real-Time Mesoscale Analysis (RTMA). The coldest air of the entire year arrived last evening and helped to make this map even more extreme. Most of Iowa is shown in the 110 to 120 degree range. Even more extreme values are found just to our north and west with a few pixels over 140 degrees! There are many interesting features on the map with the moderating effects of the Great Lakes clearly evident and the decreased variability in temperature as you get further away from land.

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Tags:   2017   rtma