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6.) July 9th-11th 2007 Duxbury VT Hail and Widespread Flooding in Barre VT
On the morning of Monday 9 July 2007 residents began hearing the first reports of severe weather across Essex and Franklin counties. This was the beginning of one of the more active three day stretches of severe weather across Vermont and northern New York in many years. This event included large and destructive hail from severe thunderstorms on July 9-10, to devastating flash flooding on July 11. Millions of dollars in damage occurred as a direct result.
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The unusual set-up focused along a nearly stationary surface frontal boundary draped across the northern New York into Vermont, separating hot and humid air to the immediate southwest from cooler air across Northern New England. The flow aloft showed several embedded disturbances in the jet stream winds, helping in the development of severe thunderstorms with very heavy downpours.

Some highlights of the 3 day outbreak include: Hail the size of tomatoes occurred at Duxbury, Vermont (See figure 6-1 for hail pictures near Duxbury, VT), while quarter size hail was reported in Duane Center, New York on the evening of 9 July 2007. Click here to view the local storm report summary from July 9th.
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On 10 July 2007 a mini supercell tracked from East Charleston to Morgan, Vermont during the late afternoon hours. This was clearly the strongest storm of the day, with a pronounced deep high-reflectivity core (greater than 60 dBZ) above 25,000 feet. Thunderstorm wind gusts to 60 mph produced tree damage and scattered power outages across northern Vermont.

By 11 July 2007 the threat switched from mainly severe weather to the potential for flash flooding. A strong surface cold front interacting with plenty of low level moisture from previous day's storms produced localized very heavy rainfall across central and eastern Vermont. As thunderstorms began to train along the eastern slopes of the Green Mountains, Flash Flood Warnings were issued for Windsor, Caledonia and Washington Counties on 11 July 2007. The one hour precipitation estimates from the KCXX (Burlington, VT) radar at the height of the event around 2 pm produced rainfall amounts in excess of 3 inches. Click here to view a 3 day listing of rainfall totals from July 9th through July 11th across the North Country. In addition, click here for a complete listing of severe weather reports on July 10th and 11th. See figure 6-2 for a radar storm total estimate of rain across eastern and central Vermont on 11 July 2007.
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As the afternoon progressed, training thunderstorms continued to develop northward, affecting much of western Orange, and eastern Washington, Lamoille and Orleans counties. The heavy rains resulted in severe flooding across the area as streams and small rivers quickly became swollen. For example, the Ayers Brook in Randolph, recorded a peak water level of 9.55 ft, good for 3rd place on their crest history, ranking behind only the 1927 flood and an event in June 1998.

Numerous roads were reported to be flooded and damaged. Particularly hard hit was the city of Barre where a local state of emergency was declared when the main part of town became submerged under several feet of water. See image 6-3 below for damage near Barre. In nearby Williamstown, over 100 people were evacuated from their homes. Certainly the three day period of July 9-11, 2007 will be remembered as one of the more noteworthy severe weather episodes in the past 10 years.
For a complete write up of this significant severe weather outbreak click the following link:

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Figure 6-1: Large Hail near Duxbury, VT. Photo by Todd Hill
Figure 6-2: KCXX Storm Total Precipitation on 11 July 2007
Figure 6-3: Flash Flooding Damage near Barre, VT. Phone by Gerald Macke

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