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Showing posts from July, 2017

Heavy Thunderstorms in Southern Minnesota

Heavy Thunderstorms in Southern Minnesota: Fast moving heavy thunderstorms crossed portions of central and southern Minnesota over July 19-20 this week. These storms also brought strong winds, with many reports of wind gusts over 60 mph. Fortunately little hail was associated with these storms. The only area to report large hail was Windom (Cottonwood County) where hail stones up to 1.5 inches in diameter were observed.

The heaviest rains occurred in southeastern Minnesota counties and in western Wisconsin, where widespread street flooding, and even mudslides were reported. Many observers reported new daily record rainfalls, including:
5.11 inches at Minnesota City (Winona County)
5.03 inches at Wabasha (Wabasha County)
4.75 inches at La Crescent (Winona County)
4.55 inches at Red Wing Dam (Goodhue County)
4.50 inches at Winona Dam (Winona County)
3.89 inches at Hokah (Houston County)
6.37 inches at Alma Dam (Buffalo County, WI)
6.26 inches at La Crosse (La Crosse County, WI)
4…

Great Variation in Rainfall this Month

Great Variation in Rainfall this Month:
So far this month the rains across the state have been very widely scattered and highly variable in amounts, including those of this week. This is especially true in western and southern counties. Across Otter Tail County total rainfall in July varies from less than a third of an inch to well over 2 inches; and across Blue Earth County rainfall for the month varies from less than a half inch to nearly 3.5 inches. Overall rainfall totals through the first 14 days of the month ranged from just trace amounts in portions of southwestern to nearly 3.5 inches in south-central Minnesota. Severe thunderstorms on Sunday, July 9th brought hail and high winds to many areas. Some very large hail (over 2 inch diameter) were reported, along with a tornado near Lake Crystal (Blue Earth County). Then another severe weather episode with dew points in the 70s F occurred across portions of central Minnesota over July 11-12, bringing hail and high winds to…

July Temperatures Following Trend

July Temperatures Following Trend:
Though the first several days of the month were cooler than normal, with the recent heat, most observers are now reported mean monthly temperatures that are warmer than normal. This follows the pattern for many recent trends. Five of the most recent seven months of July have been warmer than normal in Minnesota, while 21 of the past 23 months have been warmer than normal in Minnesota as well. The highest temperature of the summer so far was observed at Browns Valley (Traverse County) on Wednesday (July 6) of this week with an afternoon reading of 98 degrees F. In addition at least 15 climate stations have reported overnight lows in the 70s F this week. That is about 6-10 degrees F above normal. National Weather Service outlooks continue to favor warmer than normal temperatures across the state through the third week of July. The outlooks also favor, for the first time in many months, drier than normal conditions for the remainder of the mont…