Illinois Weather:  7/28/17

Yesterday, we drove through some heavy rains from Decatur, IL, to south of Chicago, IL.  However, the weather was beautiful yesterday evening in Chicago.  We ended up skipping out on the game ($75 standing-room-only seats left, and a line to get in the front gate that would mean missing everything before the 4th inning or so).  We did walk through Chicago a bit, and out to Lake Michigan, so it was pleasant enough to have a nice night outdoors.

This morning has been warm, humid, still and partly cloudy, with high clouds covering the sky.

The NWS in Chicago, IL, forecasts (for Chicago, IL) a mostly sunny day, with a high temperature of 76 F. The winds will be from the north-northeast at 15 mph, gusting to 25 mph. This evening will be mostly clear, with a low temperature of 68 F. Winds will be from the north-northeast at 10-15 mph, gusting to 20 mph.

National Weather Service (NWS) in Lincoln, IL, forecasts (for Peoria, IL) a mostly sunny day, with a high temperature of 82 F.  The winds will be from the north-northeast at 7-11 mph, gusting to 18 mph.  This evening will be mostly clear, with a low temperature of 68 F. Winds will be from the north-northeast at 5-10 mph, becoming calm after midnight.

 

The visible satellite imagery is unavailable at this time.

The infrared satellite imagery shows no thick clouds over the state this morning.  This image has been excluded from today’s post.

The water vapor imagery shows nearly-uniform moisture over the state today, moving from the northwest in response to the trough that is departing the area.

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 clear in the northern half of the state, and cloudy in the southern half.  The winds are light, statewide.  There are no major frontal boundaries over the state this morning.

The surface pressure chart shows no strong pressure systems or gradients over the state, so far this morning.  The RAP shows that no major pressure systems or gradients are expected to develop over the next six hours.

Synoptically speaking, the 300 mb NAM chart (from Unisys) shows moderate northwesterly flow as a shortwave trough forms to our northeast, over the Great Lakes.

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 some weak Cold Air Advection (CAA) moving in from the Great Lakes.  Notice how the wind crosses the thermal gradient from cool to warm.

The Precipitation chart shows that rain is unlikely in Illinois today.  This chart has been excluded from today’s post.

I am expecting a pleasant, but humid day today along our travel route in Illinois.  I’m not 100% sure where we will end the night, but I know we will leave Chicago, then meet up with an old friend in Peoria.  After that, we’ll just see how things go.

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

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About highplainschasing

This blog is about my tales in storm chasing. My name is Seth Price and I am an instrumentation instructor at New Mexico Tech. My amateur radio call sign is N3MRA.
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