The Iowa Environmental Mesonet (IEM) collects environmental data from cooperating members with observing networks. The data are stored and made available on this website.

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Yet Another 2026 Deluge

Posted: 09 Sep 2026 08:00 AM, Views: 66
It has been quite the year for big rainfall events over the Des Moines metro area. Last night's event brought severe thunderstorms to the metro area with intense rainfall rates leading to flash flooding. The featured map combines NOAA MRMS 24 hour precipitation estimates ending at 7 AM with NWS and CoCoRaHS reports. A stripe above five inches is shown across southern Polk County (Des Moines). Previous and similar IEM feature maps include 4 July and 21 July.
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Previous Years' Features
2025Earliest Sub 37°F Low
2024Algona vs Iowa
2022This would be nice, but
2021Des Moines vs Waterloo
2020Five Degree Cold High Beat
2019Weekend Rainfall
2016Ever Growing Archive
2015Weekly Squaw River Flows
2014Thunderstorm and Winds
2013September warmer than July
2011Drought History
2010Wind components
2009Lack of 80+
2008Before the first 32
2005Direct Hit
2003It's coming
2002One more day...
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News Items  

5 Sep NWS Data Outage
Posted: 5 Sep 2:03 PM

4 Sep ISU Network Issue [resolved]
Posted: 4 Sep 11:03 AM

12 Aug Service Degradation [resolved]
Posted: 12 Aug 6:13 AM

MRMS Archive Downsizing
Posted: 9 Aug 4:15 PM

26-27 July 2026 Record Dew Points
Posted: 27 Jul 8:08 PM

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Data from the Iowa State Soil Moisture Network is found on this website and daily soil temperature averages are used to produce the highlighted analysis.

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