This Hourly Forecast Graph for Atlantic City, NJ, depicts sustained winds exceeding 20 mph from Thursday morning through Saturday night. The wind direction is forecast from the NE and E, ideal directions for generating storm surge in this region.Image: forecast.weather.gov.
Such heavy rains increase the risk of multiple hazards. Obviously, more heavy rain from Joaquin falling on soil that is already waterlogged will produce fresh water flooding, as the soil cannot store any more water, increasing runoff into streams and rivers. Waterlogged soil also provides less support for trees, making it more likely that they will fall when struck by strong winds.
Wahl, T., S. Jain, J. Bender, S.D. Meyers, and M.E. Luther, 2015: Increasing risk of compound flooding from storm surge and rainfall for major US cities. Nature Climate Change, do: 10.1038/nclimate2736. Link: http://www.nature.com/nclimate/journal/vaop/ncurrent/nclimate2736/metrics/blogs.