After receiving three inches of snowfall on Friday morning
in Rockford, setting the record for the snowiest April 17th , a drastic
warmup is expected this weekend.
By early Saturday morning, a large high pressure system will
have situated itself to our south over the Missouri Valley. Simultaneously, a
strong are of low pressure will be centered over west-central Ontario. As a
result, a tight pressure gradient will form over much of the Midwest, including
northern Illinois. This will produce strong southwesterly winds through the day
on Saturday resulting in strong warm air advection. Temperatures on Saturday are
forecast to reach the upper 50’s by the mid-afternoon. The continental tropical
air mass will dry out the atmosphere enough to expect only light cloud cover overhead
meaning plenty of sunshine and no rain or snow are expected on Saturday.
A weak cold frontal boundary extending from the previously mentioned
low pressure system will approach late Saturday evening. As it moves over the
Stateline overnight and into early Sunday morning, a chance for rain is expected
in the predawn hours of Sunday and through the early afternoon. An approaching high
pressure system from our northwest following the frontal passage should clear up
most of the cloud cover shortly after the chance for rain recedes. With the
passage of a weak cold front and mostly cloudy skies in through the morning has
us expecting temperatures to be a couple of degrees cooler than on Saturday but
still climbing into the middle to upper 50’s through most of the area.
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