#ILwx #INwx #OHwx Fri All Zones – Detailed update on complex weekend winter system…all modes of precipitation possible. M.
Synopsis: What hasn’t changed since our last update is how complex this system is from accumulating snowfall, accumulating freezing rain/sleet and arctic cold/flash freezing concerns on the backside of this system. Going to take a while for the air to saturate today for precipitation to actually start hitting the surface today; it starts earlier around 3-5pmCST across eastern IA/western IL for accumulating snow. We are watching for a heavier accretion of ice ~10pm-4am near central IL, central IN and western OH as this system moves west to east…we would not be surprised to see a freezing rain advisory for these areas. We transition back to snow Saturday night through Sunday morning. We are very concerned with flash freezing on the backside of this system as well especially if we get additional precipitation…this will make surfaces very slick considering how quickly temperatures drop; if you have any questions/concerns at all please reach out to us! We will continue to monitor the trends on the latest data and update as necessary. Stay safe out there, folks!
Current Radar (2:00pmEST):
Current Weather Advisories…we think a more widespread freezing rain advisory is possible across central IL/IN as well.
Here’s a look at simulated radar through 6amEST tomorrow morning…details on timing/precip-type/accumulations in the video. We are concerned about freezing rain accumulations across central IL/IN/OH.
Simulated radar picking up where the HRRR left off is the RPM…we see the sleet/freezing rain start to transition to snow on the backside of the system as it exits from the NW to the SE across the Zones.
Snow/Ice accumulation map through Sunday morning
Backside snow accumulation Sunday…note the low confidence as this system is evolving, but we have the potential to lay down 1-3″ in spots on the backside of this system and even more across northern IN with lake-effect snows. Please also note, there is a chance the NO SNOW accumulates, but we want to keep you ahead of the game as these systems are notorious for squeezing the remaining moisture left in the atmosphere as they pass. More updates on this as we move forward.
Flash freezing VERY possible on the backside of this system Saturday night into Sunday…any remaining moisture on the ground freezes on contact especially on surfaces that aren’t treated. We recommending monitoring your lots very closely and air on the side of caution. If you have any questions please contact us!
Today’s Video (10 min):