Video of the Late Afternoon Thunderstorms

An Interesting day Weather-Wise if you were watching the radar, several outflow boundaries passed through in several directions sparking Thunderstorms, one boundary even moved from East to West! The afternoon storms them selves were not too special, at my location they came with very heavy rain, and Breezy ESE winds, I measured 0.40″ of rain in a short time, The direction the afternoon storms moved made it more interesting, The storms moved from East to West, which is rare! The reason for this usual movement was an outflow boundary which formed off of Severe Thunderstorms that were moving through Central Wisconsin, an outflow boundary of rain cooled air developed and began moving West, as it moved west, Thunderstorms sparked from this boundary, although the Actual cells were moving North, the developing thunderstorms were moving west!

Then later on during the day after dark, Thunderstorms that were forming in Minnesota on a nearly stationary cold front push another boundary back through in the opposite direction of the first one, This one moved SW to NE, these storms brought more Heavy rain and lightning and this time gusty SW winds to my location. with another 0.35″ of rain, I had no damage from the storms, but I did see a few very small branches down and a part my peony plant blown and beat down from thunderstorm winds and very heavy rain. Highest wind gust on my station 21MPH

In total for the day including both storms, I picked up 0.75″ I our driveway was washed out some with this rain, Some areas had much more, and had minor flooding. Up to 3.0″ of rain fell in parts of Barron County in about and hour, and from some of these areas I have un official reports of washed out field crops, and ditches.

Picture of the very west edge of a heavy Thunderstorm May 25th.

What else made the day very interesting about the East to West moving outflow boundary is and storms, was the increased dew points/humidity it brought as it passed. Earlier during the day, my Temperatures was 92.F and Dew point was in the low 60s, and the haze in the sky was minimal to none, but a very weak boundary held very humid, hazy air just to my east over Eastern Barron County, As this outflow boundary passed it brought that humid air back west on breezy East winds to 21MPH, I was able to watch as the boundary passed, and I could literally see haze blowing in from the East and you could feel the air had much more moisture, it was quite a neat thing to see, I have never seen anything like it before, The very Western edge of the thunderstorm pictured above hit just after the boundary passed. The Dew point raised from 63.F to 68.F and the temperature dropped from 92.F to the low 80s with in about 25 to 30 minutes, and by 5PM rain cooled air lowered the temperature into the upper 60s!

I’d Also like to say, as mentioned above I hit 92.F today, this puts the number of days so far this year at or above 90.F at 2, This already Surpasses the number of 90 degrees days we had last year in 2009. Hitting 92.F also means I’ve tied the warmest temperature that I recorded last year, and the warmest temperature I’ve ever recorded on my station so far in the past 3 years or recording.