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WFO BTV Top 10 Weather Events of 2000 to 2009
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5.) Flash Flooding - Addison County, Vermont, August 6, 2008
During the morning hours of 6 August 2008, heavy rainfall (Fig. 5-1) produced flash flooding in southern Addison, northern Rutland, and northwest Windsor Counties in Vermont, and was most significant along the upper reaches of the White River in Hancock, Vermont. A mid-tropospheric vorticity maximum caused numerous heavy convective showers, which tracked eastward across the headwater basins of the Otter Creek (Middlebury River, Sucker Brook), and the White River (Hancock Branch) (see radar reflectivity loop in Fig 5-2). Warm rain processes contributed to rainfall amounts of 3 to 5 inches, with anecdotal reports of 6 to 7 inches of rain in some spots. Spot rainfall totals included 3.03 at Salisbury, VT.

Several road washouts and severe damage to some homes were reported. Many sections of U.S. Forest Service roads were destroyed, isolating campsites crowded with summer vacationers. U.S. Route 7 was closed south of East Middlebury, where the swollen Middlebury River inundated the highway.
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Additional information on the August 6, 2008 flash flood event can be found here: http://www.erh.noaa.gov/btv/events/06Aug2008/.


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Figure 5-1: 24-hour rainfall amounts for the period ending at 7 am EDT on 6 August 2008
Figure 5-1: 24-hour rainfall amounts for the period ending at 7 am EDT on 7 August 2008
Figure 5-2: KCXX composite reflectivity loop, from 0500 UTC (1 am EDT) through 1900 UTC (3 pm EDT) on 6 August 2008


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