Wednesday July 29, 2009 Excessive Rain/Isolated Severe T'Storm Event
A Selection of Radar Images

#1 Albany NEXRAD base reflectivity image, lowest tilt, 2:01pm Wednesday July 29, 2009: This is a rotating t'storm, the first to develop in the event. This storm put down the initial round of torrential rain and also carved out the path for other torrential downpours to follow initiating the major flash flood event. Torrential rain was falling on Kinderhook at this time with the rotation between Coxsackie and Ghent in close proximity to the rain free notched area, where the inflow was feeding into the storm. This storm produced frequent lightning through it's life cycle and wind damage in West Coxsackie at 1:45pm. It, along with many others, tracked northeast up into Stephentown putting down torrential rainfall.

Albany NEXRAD base reflectivity image 2:01pm Wednesday July 29, 2009 

#2 Albany NEXRAD base reflectivity image, lowest tilt, 3:47pm Wednesday July 29, 2009: A more general area of tropical stratiform rainfall was in the process of overtaking the initially discreet convective cells over the mid Hudson valley, Mohawk valley, and Adirondacks at this time. The areas shaded in red indicate where torrential rain was falling. Notice the southwest to northeast oriented zone of torrential rain from the Sacandaga Lake area in eastern Fulton County to northern Washington County where flash flooding was underway at this time.

Albany NEXRAD base reflectivity image 3:47pm Wednesday July 29, 2009 

#3 Albany NEXRAD base reflectivity image, lowest tilt, 3:04 pm Monday June 15, 2009: A short lived break in the heavy rain developed over Greene, Columbia, Berkshire, Ulster, Dutchess, and LItchfield counties at this time. Fairly unstable air, however, continued across this region which allowed additional heavy rainfall development later in the evening and through the overnight. At this time, the most torrential line segment of rain was occurring over eastern Fulton and Montgomery counties with urban and poor drainage flooding being reported.

Albany NEXRAD base reflectivity image 5:42pm Wednesday July 29, 2009 

#4 Albany NEXRAD base reflectivity image, lowest tilt, 6:47pm Wednesday July 29, 2009: A particularly intense band of rain, accompanied by wind gusts ranging from 40-50 mph, is shown from southern Warren County on south through central Saratoga County. This zone expanded east to produce torrential rains through the evening in Washington County. Bands of heavy rain at this time were increasing in intensity in Schoharie, western Greene, and western Ulster counties as well.

Albany NEXRAD base reflectivity image 6:47pm Wednesday, July 29, 2009 

#5 Albany NEXRAD base reflectivity image, lowest tilt, 8:19pm Wednesday July 29, 2009: Extremely heavy rain was falling at this time in the areas shaded in bright red from the Washington-Saratoga County line on south into Rensselaer, Columbia, portions of Berkshire and Ulster counties. Massive flash flooding was well underway throughout eastern Greene, northern Columbia, and southern Rensselaer counties.

Albany NEXRAD base reflectivity image 8:19pm, Wednesday July 29, 2009 

#6 Albany NEXRAD base reflectivity image, lowest tilt, 8:33pm Wednesday, July 29, 2009: Significant enhancement with thunder was occurring at this time over the flood zones in Rensselaer, Columbia, and Berkshire counties. Notice the deep red and even purple shaded areas indicating extreme rainfall rates.

Albany NEXRAD base reflectivity image 8:33pm, Wednesday July 29, 2009 

#7 Albany NEXRAD base reflectivity image, lowest tilt, 11:38pm Wednesday, July 29, 2009: Heavy rain continued in Columbia County as illustrated in this radar image through midnight with additional rainfall amounts between midnight and 8am Thursday of up to one inch bringing grand totals around Kinderhook to over 7.00". The continuation of the rain through the night, even though it was lighter than earlier in the day, enhanced the flooding situation.

Albany NEXRAD base reflectivity image 11:39pm, Wednesday July 29, 2009