A quick-moving upper-level wave will push across the Northern Plains, diving into the Great Lakes and Ohio Valley regions late tonight through Halloween. This system will bring the first flakes of the season and even areas of accumulating snow with it. However, by late in the night on Halloween, bone-chilling cold is also expected!
The focus overnight tonight will be across eastern portions of MN, northeastern IA, and northern/central WI for the possibility of snow. However, as a cold front moves through tomorrow morning into midday, snow showers will become possible in northern IL and southern WI for areas like Milwaukee, WI & Chicago, IL who could see their first accumulating snow of the season!
Into the afternoon, snow showers will move into Indiana and even portions of central and eastern Illinois. All while additional snow showers remain in northern IL and southern WI! Snow showers will continue moving to the east into the evening hours on Halloween for places like Indianapolis, IN, Columbus, OH, and Cincinnati, OH, who could see a few flakes as kids head out for trick-or-treats!
As the strong upper-level wave moves across northern Illinois and southern Wisconsin tomorrow afternoon into the early evening, cold air aloft will create strong lapse rates (instability) through the atmosphere. This could lead to some moderate to heavy bursts of snow there locally, along with areas of snow squalls! These areas of moderate to heavy snow, albeit local, will reduce visibility and could lead to a few slick spots as they move through!
500 mb Temperature
While snow showers will taper off for most locations through 8-10 pm tomorrow, places across northwestern Indiana (Closer to Gary and Valparaiso, IN) and northeastern Ohio (closer to the Cleveland area and east) will see their first lake effect snow of the season! Snow will tend to last into early to mid-morning on Wednesday and could make for some slick conditions for areas like Chardon and Ashtabula, Ohio!
Snowfall amounts of 1-2” are forecast across portions of Wisconsin tonight into tomorrow morning. Areas across the Ohio Valley are forecast to see less than 1” of snowfall accumulation on Halloween which will be limited to mostly grassy and elevated surfaces. High solar angle, warm ground temperatures, and afternoon highs above freezing are expected to limit pavement impacts tomorrow across the region.
Perhaps some exceptions to that will be across Wisconsin into northern Illinois where locally heavier bursts of snow are realized tomorrow morning and tomorrow afternoon where brief, slushy impacts to the pavement are possible. Some areas into the primary snow belt of northeast Ohio could see 2-4” of accumulation!
As the system quickly races through tomorrow evening very cold air will surge in. By early Wednesday morning, temperatures will be running around 10-20°F below average across the region as lows fall into the mid-teens and 20s!
SURFACE TEMPERATURE ANOMALIES WEDNESDAY MORNING
Some areas across the Ohio Valley could break daily record low values. Wind chills early Wednesday morning look to be in the teens across much of the region!
WEDNESDAY MORNING FORECAST LOW (BOXES REPRESENT RECORD LOWS)
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