The Iowa Environmental Mesonet (IEM) collects environmental data from cooperating members with observing networks. The data are stored and made available on this website.
Wind Advisory Timing
Posted: 20 Nov 2024 05:30 AM, Views: 469
The National Weather Service in Sioux Falls, SD issued a Wind Advisory Tuesday afternoon till Wednesday evening for a few counties in far northwestern Iowa. The featured chart looks into the time of day timing for when such events are in effect. The plot is effectively for Sioux County and shows the percentage of all 203 events on record for the site active during a given minute of the day. The diurnal signal is clear with the largest frequencies found during mid afternoon hours. This coincides with the strongest solar heating and mixing of the lower atmosphere, this mixing transfers higher momentum air to the surface, increasing wind speeds! The overnight frequencies are rather constant and are those events associated with strong surface pressure gradients between high and low pressure systems.
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Previous Years' Features
2023: Pushing Three Weeks
2020: 70+ in November
2019: Fall 50+ Days
2018: Monthly HDDs
2014: November Frozen Streaks
2013: 3,000th Daily Feature
2009: Sunny at noon?
2007: 60 degrees at 6 AM!
2003: Canned Air
2002: GIS Day 2002
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Soil Temperatures
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.