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

IEM Daily Feature

Wind Advisory Timing


Posted: 20 Nov 2024 05:30 AM, Views: 430
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.
Rate Feature

Previous Years' Features
Avoca I-80 FP2000, IA Webcam:
News Items  
Current Website Performance:
Bandwidth: 24.8 MB/s
Total Website: 2,289 req/s
API/Data Services: 53.3 req/s
API Success: 100%

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.

Precipitation

More Precipitation Maps

Current Data

The IEM combines data from participating networks into products like maps shown above and web applications to analyze the data.

More current products »

Partners:

ISU Agronomy
IIHR - University of Iowa
DOT
NWS