A cool front is settled across central Illinois on Sunday, and will move back toward the north as a warm front on Monday. High pressure over the Great Lakes will dominate our weather tonight, but clouds will increase late tonight, and it will be mostly cloudy as the warm front approaches from the southwest on Monday. The air is very dry with very low dewpoints, and high pressure is all set to build in aloft so chances of thunderstorms are minimal. However, there may be just enough instability on Monday afternoon to allow a couple of t-storms to develop. Areal coverage, if they do materialize, will be very low, and they will be relatively weak. The warm front will be right overhead on Tuesday and Wednesday with an increasing south/southeasterly flow at the surface, and increasing moisture associated with the low level jet. Contrary to what you may think, chances of precipitation will be almost nil because of building high pressure aloft over our region capping activity here. There is a likelyhood of plentiful shower and thunderstorm activity to the north across central and northern Wisconsin. With the warmer air continuing to feed into our area, temperatures will reach into the low 70's again by Tuesday, and the upper 70's by Wednesday, which probably will be the warmest day of the week. You will not have to go all that far south in Illinois on Wednesday to find 80 degree weather...probably just south of Interstate 80. The weather will become more active on Thursday with increasing chances of showers and thunderstorms. It will not be as warm on Thursday as skies become mostly cloudy along with the threat of thunderstorms. It will be a little cooler heading into next weekend, but temperatures will still be above average. The models diverge in their handling of weather systems so the confidence level for forecasting weather conditions is low late in the week. Have a great week!
by Meteorologist
Eric Nefstead
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