The Iowa Environmental Mesonet (IEM) collects environmental data from cooperating members with observing networks. The data are stored and made available on this website.
Temperatures Above Us
Posted: 18 Dec 2018 05:34 AM, Views: 101
Temperatures warmed nicely on Monday with highs in the 40s for those without significant snow cover. Do warm surface temperatures translate to warm temperatures aloft? The featured chart presents December temperature percentiles for mandatory sounding pressure levels from the Omaha site on Monday night. Values of 100 would indicate the warmest on record for the site. Please recall that pressure decreases with height, so the first value shown at 925 mb is the closest to the surface. So indeed the levels nearest to the ground are warm as well, which makes sense as this is the air that mixes to the ground during the day. But as you go up higher in the atmosphere, temperature percentiles go down until rapidly increasing again above the tropopause. The explanation is a bit complex, but likely involves the 400 to 50 mb levels being anonymously high due to the warmer lower atmosphere and thus colder temperatures near the tropopause.
Previous Years' Features
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.
Besides point observations of precipitation, the IEM also processes gridded rainfall products made available by NOAA. This information is archived and made available in GIS ready formats.
The IEM combines data from participating networks into products like maps shown above and web applications to analyze the data.