Saturday, January 21, 2012

Saturday evening weather update

Arctic high pressure which has shifted off to the east. The Stateline has had 4 days in a row with below average temperatures. That has not happened since the last week of October when Rockford recorded 6 days in a row below average. With the high pressure shifting off to the east, temperatures will hold steady in the middle teens tonight, and may rise a few degrees toward daybreak. With milder air from the plains, and lower Mississippi Valley overrunning the retreating cold air, there could be some freezing drizzle on Sunday morning. Temperatures should rise above freezing by 1 pm on Sunday ending the freezing precipitation threat. There could be a little light rain or drizzle on Sunday afternoon as temperatures rise into the middle 30's. There will be a brisk southerly wind on Sunday from 15-25 mph with some gusts to 30 mph ahead of low pressure over the central plains.  Light rain will be likely on Sunday night, and with warmer air continuing to stream over the snow covered ground, fog will be possible, and it could become locally dense. Areas to the north and west of Rockford will probably see wet snow mix with the rain and change over to all snow before daybreak. Accumulations in that area are expected to be minimal, generally less than an inch. On Monday, with strong low pressure pulling away toward the northeast across Wisconsin and Lake Michigan, it will be windy with some light snow. Again, accumulations are expected to be minimal. Winds will be northwesterly at 15 to 30 mph bringing colder air back into the Stateline. Temperatures will fall from the low 30's in the morning into the 20's during the afternoon. A bubble of Canadian high pressure will clear skies on Monday night, and drop temperatures into the middle teens. Tuesday will be mostly sunny and chilly with a high in the upper 20's.  By Wednesday morning the chilly high will be off to the east and a warmer pattern will set in across the mid west for the rest of the week.  Highs will generally be in the middle 30's, and lows will be in the low to middle 20's for the rest of the work week. No significant weather systems are expected.

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