Heavy Rain Event (Former Hurricane Jeanne Related)
For the third time this month, heavy rain developed across parts of eastern New York and western New England as a result of a decaying hurricane moving up through the eastern third of the country. This time, the former Hurricane was Jeanne. And this time, the rainfall, especially the area of excessive rainfall, was not as widespread as the previous two events, generally confined to the Catskills and mid Hudson valley in New York to central and southern Berkshire county on south in New England.
A strong low pressure trough in the northern branch of the jet stream acted somewhat as a shunt, pushing a cool front into New York and creating a sharp west to southwest flow at the steering level of the atmosphere which together caused a very sharp cut-off to the northern extent of the very heavy rain associated with the remnants of Jeanne which were located across Virginia through the day. Because of the shunting effect of the upper level low pressure trough, rain from the Jeanne only made it as far north as the Mohawk valley, Saratoga, Washington, and Bennington counties, during the morning, before slowly retreating to the south and east through the day. The axis of excessive rain set-up much further south, over Delaware, Greene, Columbia, and central and southern Berkshire counties as well as impacting parts of Ulster, Dutchess, and Litchfield counties. Rainfall amounts in this region ranged on average from 2"-3.5". Rainfall in the immediate Capital Region ranged from 1/2"-1" and just north of Albany into the Mohawk valley, Saratoga, and Washington counties, ranged from a trace to 1/2."
Steady rain continued in the Catskills, mid Hudson valley and Berkshire county through the entire day and well into the night before gradually tapering off and ending during the early morning hours on the 29th. No significant flooding occurred due to the heavy rain.
WeatherNet 6 Rainfall totals from Tuesday, September 28-Early Wednesday, September 29 (Hurricane Jeanne Related Event)