The first of two “Colorado lows” formed through the evening
on Friday and propagated eastward into the central Plains through the night and
into Saturday. Come Saturday morning, rain showers formed in the northcentral
Plains along the system’s warm front. These showers were propelled eastward by
strong low and mid-level winds entering the Stateline midafternoon on Saturday.
This rain continues to fall through Saturday evening with embedded pockets of
heavy rainfall. A chance of showers is expected to last through the night although
the rain will become much more isolated following midnight.
Easter morning, we can expect mostly cloudy skies with a few
lingering, isolated showers. The second, and stronger, of the two Colorado lows
will approach the area from the southwest on Sunday causing rain over the Stateline
to intensify and become more widespread by the early afternoon. This second round
of heavy showers could feature a few embedded thunderstorms. As the storm moves
across the area and off to our west, scattered showers wrapping around the back
end of the system will likely transition into snow flurries, or at least a wintry
mix, overnight as temperatures will quickly cool. This chance for isolated
flurries will last through midmorning on Monday with no accumulation expected.
Strong northwesterly flow following the storm’s passage will
keep our temperatures in the lower 40’s on Monday. The rapid intensification of
a superimposed jet stream situated to our south early in the week will cause
significant midlevel cold air advection and keep our temperatures in the lower
to middle 40’s likely through Thursday. With the normal high in Rockford
reaching the 60 degrees on Monday and 61 degrees by Wednesday, temperature
departures will likely fall between -15 and -20 degrees through most of the
upcoming work week.
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