Long Term Forecast Jan 21
Long Range forecast 3 to 7 days from Jan 21 is as follows...
The large trough across the North-eastern and Eastern U.S. will continue to bring cold air disturbances from Canada until early next week. Through the next seven days, chances for snow will depend on the position of each wave, but expect temperatures below normal to continue.
500mb vorticity for 06UTC (1am EST) Saturday 01/25/2014 showing an upper level vorticity maximum over central Illinois.
850mb winds, heights, and temperatures for 18Z (1pm EST) Saturday 01/25/2014.
NOAA surface pressure chart for 12UTC (7am EST) Monday 01/27/2014. The cold front coming through this weekend will already have pushed through bring colder temperatures into the area at the beginning of the week.
Friday - In the late afternoon/evening, temperatures will rise slightly... as warmer air (20F - 30F) will spread over the area briefly until a cold front passes over late Saturday.
Saturday - High winds throughout the day... as a cold front passes later in the afternoon wind directions will shift from Westerly to North-westerly and wind speeds will increase further. Widespread snowfall is likely throughout the day and lake effect snow is likely. 0.5 to 2 inches of snow accumulation is expected.
Sunday - Another precipitation system will bring snow to the area in the afternoon. Temperatures will be in the teens during the day.
Monday - Nighttime and morning snowfall continuing from the late Sunday system. The Southern half of the state will see the greatest accumulation with the Northern part of the state seeing smaller amounts of snow. Snow showers are expected to add near an inch of accumulated snowfall.
Tuesday - Temperatures will be very cold. Lake effect snow is likely for the far Northern areas in Indiana.