Summary of Rain & Ice
Summary of Heavy Rain and Ice
2009 February 9th - 10th
List of Ice Reports
(pdf file, may take up to a min to download)
A deepening low pressure system slowly made its way northeast across the upper plains on Monday, finally centering over northern Minnesota on Tuesday. The low pressure center finally pushed northeast into the borderland and exited the region into Ontario, Canada by Wednesday morning.
Locations across Minnesota and Wisconsin experienced a combination of winds gusting in excess of 30 mph, heavy rain, areas of fog, and a February thaw this week. Most areas reached their warmest temperatures, in the upper 30s to low 40s late Monday night, then held steady through Tuesday night. The warm air took longer to work its way into the far northeast sections of Minnesota and along the North Shore of Lake Superior where temperatures hovered around 30 F degrees through the day Monday, before finally warming above freezing in the evening and overnight hours. As a result of the persistent shallow layer of sub-freezing air and ground temperatures, locations from the Duluth-Superior area to Silver Bay, Finland, and Grand Marais saw freezing rain and a widespread glaze of ice Monday. Most areas received around a tenth of ice, with higher amounts of around two tenths along the North Shore of Lake Superior. Luckily, most of the roadways were pre-treated over the weekend and this allowed for streets to remain mostly ice-free with the exception of dirt roads and un-treated driveways and parking lots. The ice that did accumulate on the trees and power lines melted after a short time as temperatures continued to rise through Monday night.
Impressive February rainfall amounts were also recorded with new daily rainfall records set at both International Fall and Duluth. Most areas in northeast Minnesota received a third to a half inch of rain while higher amounts approaching one inch were measured at locations in the higher terrain of the North Shore of Lake Superior.
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