Situation Report for the upcoming storm

Winneshiek County Emergency Management Coordinator, Sean Snyder, has released a Situation Report for the upcoming storm anticipated from Tuesday through Thursday this week.  

Winneshiek County Emergency Management Coordinator, Sean Snyder, has released a Situation Report for the upcoming storm anticipated from Tuesday through Thursday this week.  
Back-to-back rounds of high-impact winter weather take aim at the region from Tuesday nightinto Thursday. The first round of moderate to heavy snow occurs Tuesday night. The snow lessens in intensity or even ends for a short period on Wednesday, though increasing winds combined with any falling snow/fresh snowpack may lead to travel impacts due to blowing and drifting of snow. A second round of heavy snow, mixed with freezing rain/sleet south of I-90, arrives late Wednesday afternoon and lasts through Thursday.
It is highly likely that some locales in southeast Minnesota and west-central Wisconsin see over a foot of snow by the time the event ends. Confidence is high (>90%) that this storm will occur, with the greatest forecast challenge being the exact location of the heavier snow and mixed precipitation-type transition zone.
A Winter Storm Watch is in effect for portions of southeast MN and western Wisconsin Tuesday night. At this time, the weather system is being monitored, but Snyder encourages people to plan ahead.  Wednesday Late Afternoon –Thursday: SNOW, WINTRY MIX, WIND, with heavy snow and a wintry mix. Strong winds gusting over 30 mph.
Heaviest snow north of I-90, wintry mix over northeast Iowa and far southwest Wisconsin. Highest ice accumulations along and south of Highway 18. Dangerous travel conditions owing to snow-covered/slick roadways and potential whiteout conditions in open locations. The evening and morning commutes would be impacted. Powerlines and tree branches may be damaged from the combination of icing and strong winds. PLAN NOW for travel impacts. Avoid unnecessary travel and/or delay if you can. Anticipate severely reduced visibilities.

TUESDAY – DAY
2-21-2023 A 40 percent chance of snow, mainly after 3pm. Increasing clouds, with a high near 28. Wind chill values as low as -2. Northwest wind 5 to 14 mph becoming southeast in the afternoon. Winds could gust as high as 24 mph. Little or no snow accumulation expected.
TUESDAY – NIGHT
2-21-2023 A 40 percent chance of snow, mainly before 1am. Cloudy, with a low around 25. Southeast wind 9 to 13 mph becoming northeast after midnight. Winds could gust as high as 21 mph. New snow accumulation of less than a half inch possible.
WEDNESDAY – DAY
2-22-2023 A chance of snow before noon, then snow and sleet between noon and 3pm, then snow after 3pm. Patchy blowing snow after 4pm. High near 29. Blustery, with a northeast wind 14 to 24 mph, with gusts as high as 37 mph. Chance of precipitation is 90%. New snow and sleet accumulation of 1 to 2 inches possible.
WEDNESDAY – NIGHT
2-22-2023 Snow before 9pm, then snow, possibly mixed with freezing rain and sleet between 9pm and 3am, then snow, possibly mixed with sleet after 3am. Patchy blowing snow. Low around 21. Blustery, with a northeast wind 22 to 24 mph, with gusts as high as 37 mph. Chance of precipitation is 100%. New ice accumulation of less than a 0.1 of an inch possible. New snow and sleet accumulation of 2 to 4 inches possible.
THURSDAY
2-23-2023 Snow, possibly mixed with sleet before noon, then a slight chance of snow. Patchy blowing snow before 7am, then patchy blowing snow after 3pm. High near 25. Breezy, with an east wind 16 to 21 mph becoming northwest in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 90%.