Chicago Storm

LOT finally added the additional counties I mentioned earlier to the ice storm warning, and upped ice totals to 0.50"...which will probably still be low in a few areas, but beter off than before.

Started off as snow/sleet here early this evening for an hour or two, but has been FZRA ever since then. .

Would have northern tier in WSW.

Would have included Cook, DuPage, Will and Grundy as well.

That new LOT ice storm warning will already be busting before too long. Calling for 2-5" of fantasy snow, and 0.30" ice...which will be reached not too long from now in many areas.

LOT finally upgrades to ice storm warning for some counties, but still missed some.

Not only is LOT doing a horrendous job, but DVN is following as well. Ice accums by GBG have exceeded the forecast and are in warning criteria range now. .

This is just about as good as a set-up I've seen around here for sig ice across a good portion of the area. Given those earlier reports near GBG of 0.20", it should be fairly easy to get into at least the middle of that range.

Likely going to see an axis of 0.25-0.75" ice across Northern Illinois somewhere.

0.20" ice accrual report NE of Galesburg already.

Pretty clear the warmer NAM is the way to go, and the GFS will be set up for an lol worthy fail. Looks like a solid sleet/freezing rain event for a good portion of the LOT CWA.

Few weak LE bands pushing inland across NE. IL currently. It's actually snowing here now because of them.

That's one big positive from the last ice event... With that event we had temps of mid to upper 30's being advected in from MI/IN, but this go around we have temps in the mid 20's to low 30's being advected in. Additionally, we are going into this event colder days prior, unlike last time where there was that brief mild period prior.

Can't wait to see negative nancy Cyclone roll in with another 6"+ event when it ends.

The 12z RGEM following the NAM, and coming in SE. .

Likely would be WSW’s, given a mix of p-types. .

0.6" at ORD and here, from the snow with the lead wave on Sunday.

By the way, the RAP and HRRR continue to trend south each run, and are going to be horrendous in their extended ranges as they have been with several recent systems. .

Low balling your area like usual. .

Right now I’m thinking 1-6” snow/sleet spread across the area, lower towards I-80 and highest near IL/WI border. Then probably an axis of 0.10-0.25” ice accrual across the heart of the LOT CWA as well. .

Sunday looking like a minor snow event, 0.5-2.5" area wide.

Another ice threat for some areas tonight. Might be a decent NNE/SSW axis that runs up around DBQ as well.

THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A * FLASH FLOOD WARNING FOR... WEST CENTRAL WILL COUNTY IN NORTHEASTERN ILLINOIS... NORTHEASTERN GRUNDY COUNTY IN NORTHEASTERN ILLINOIS... * UNTIL 1245 PM CST * AT 942 AM CST, EMERGENCY MANAGEMENT OFFICIALS REPORTED FLASH FLOODING OCCURRING DUE TO RAPID BREAK-UP OF AN ICE JAM ON THE KANKAKEE RIVER. EVACUATIONS ARE CURRENTLY UNDERWAY AND MULTIPLE ROADWAYS ARE FLOODED. * SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... LOW-LYING AREAS ALONG THE KANKAKEE RIVER NEAR CHANNAHON, MINOOKA, COAL CITY AND DIAMOND. THIS WARNING INCLUDES... CHANNAHON STATE PARK. .

Still raining, but not freezing anymore with a temp up to 34 now. Backside of precip area will be moving in shortly. Gonna finish with close to 0.15" ice accrual.

0.30" official ice total for DVN.