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Heavy Precipitation Supercells of 29 May 2012

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Part V: Conclusion/Pictures

The first major severe weather event of the season occurred due to a number of important features. A very sharp surface warm front slowly moved northeastward on the night of May 28th. Surface temperatures were in the 50's with dew points in the 40's near Montreal, Quebec north of the front, while south of the front; temperatures in central New York were in the upper 70's with dew points near 70 degrees. This was the primary focus for heavy rain and thunderstorms during the night of May 28th into the morning of May 29th. This primed the area for a flooding threat with a widespread area of greater than one inch of rain. As the warm front moved northeastward, the warm and moist air mass moved across most of the North Country with temperatures in the 80s and dew points around 70 degrees. This very unstable environment, combined with the warm front draped across central Vermont and a surface cold front and pre-frontal trough in New York, helped to produce strong to severe thunderstorms across the North Country during the afternoon hours on May 29th, which transitioned into a significant flash flood event during the late afternoon and evening hours.

This severe weather event included a confirmed EF0 tornado near West Glover, Vermont, along with numerous reports of large hail and damaging thunderstorm winds. The thunderstorms were also accompanied by very heavy rainfall amounts of 2 to 4 inches with localized radar estimates near 6 inches which caused significant flash flooding. As a result, many roads were washed out and numerous rivers and streams had sharp rises.

The most severe weather and flooding reports were concentrated from the eastern Adirondack Mountains in northern New York into central and northern Vermont. These reports were associated with several long-tracked heavy precipitation supercells, which continued into parts of New Hampshire. Pictures of the flooding, hail, and tornado damage can be seen below in figures 26 through 32.

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Figure 26: Flood debris includes a children’s bicycle along Mink Farm Road in Lowell, VT.
Figure 27: Trees, a trailer, and a boat were washed away and deposited downstream in Lowell, VT.
Figure 28: Significant washout on Cheney Road in Lowell, VT.
Figure 29: Chimney damage from the tornado to a house on Beach Hill Road in West Glover, VT.
Figure 30: Trees uprooted in West Glover, VT. There were a total of around 45 trees damaged or uprooted by the tornado.
Figure 31: More uprooted trees in West Glover, VT with trees crossing each other caused by the tornado.
Figure 32: Ping Pong Ball Sized hail (1.5" diameter) in North Pomfret, VT from the nocturnal storms of May 28th before the outbreak on May 29th (courtesy of Scott Woodward).

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Page last modified: June 9, 2012
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