Yesterday, we drove through mostly sunny skies and warm, still weather from eastern Kansas into central Illinois, without any incident. The evening was clear, mild and still in Forsyth, IL, and so we watched the International Space Station (ISS) pass overhead.
This morning has been warm, still and sunny. There are virtually no clouds this morning.
National Weather Service (NWS) in Lincoln, IL, forecasts (for Decatur, IL) a sunny day, with a high temperature of 84 F. The winds will be from the east-southeast at 6-8 mph. This evening will be mostly clear, with a low temperature of 65 F. Winds will be from the east-southeast at 3-5 mph.
The NWS in Chicago, IL, forecasts (for Chicago, IL) a sunny day, with a high temperature of 77 F. The winds will be from the east-southeast at 5-10 mph, gusting to 15 mph. This evening will be mostly clear, with a low temperature of 68 F. Winds will be from the south at 10 mph.
The visible satellite imagery is unavailable at this time.
The infrared satellite imagery shows no clouds over the state this morning. This image has been excluded from today’s post.
The water vapor imagery shows that the air is almost uniformly damp across the entire state this morning.
The 12Z sounding is unavailable at this time.
The surface observations (from the SPC Mesoscale Analysis Map) show mild temperatures and high humidity (based on the surface dewpoint depressions). The skies are mostly clear, and the winds are light. There are no major frontal boundaries present.
The surface pressure chart shows no strong pressure systems or gradients over the state, so far this morning. The RAP shows that the pressure is expected to drop, statewide, with diurnal heating, over the next six hours. No strong pressure gradients are expected to develop.
Synoptically speaking, the 300 mb NAM chart (from Unisys) shows weak northerly flow. Even though the polar jet is to the north, there is a weak, elongated region of higher wind velocities extending through the whole of Illinois by 00 Z.
The 500 mb NAM chart shows no strong vorticity advection over the state today. This image has been excluded from today’s post.
The 700 mb NAM chart shows no large pockets of rapidly-rising air. This chart has been excluded from today’s post.
The 850 mb NAM chart shows no major thermal advection over the state today. This chart has been excluded from today’s post.
The Precipitation chart shows that rain is unlikely, statewide through 00 Z. This chart has been excluded from today’s post.
Today will be warm, humid, and still across Illinois. I will spend some of the day indoors at various safety talks, but will do an industrial plant tour in the afternoon and tomorrow. Those will be hot. I don’t expect any showers or thunderstorms today.
Thank you for reading my post.
The upper air soundings and mesoscale analysis plots are from the Storm Prediction Center website.
The forecasted upper air soundings are from TwisterData.com.
The surface observation and upper level charts are from Unisys Weather.
The satellite data is from College of DuPage – SATRAD