Average and Record Statistics Per Time Frame For The Lower 48
To the right is a graphic showing averages and extremes for a 15 year sample of tropical cyclones and their remnants affecting the contiguous United States. The units of the rainfall amounts are in inches, while the time units are in hours. The bars in the graph express the percent of the storm total rainfall, which is defined to be 100 percent in the final column. Note that, on average, as much as one-fourth of the total occurs in 2–3 hours, while half falls within 12 hours, and almost three-quarters of the storm total falls within a 24 hour period. Cases where a cyclone scraped the coast were not separated out from those that made a more direct landfall. Also, Pacific and Atlantic cases were not separated. This all explains the average storm total of the sample being depressed to 338.8 mm/13.34". On the bottom of the graphic are listed the averages per time frame and the records. The records were mainly set during Tropical Storm Allison (2001) and Hurricane Danny (1997). This graphic will be updated as the climatology pushes farther back in time.
Read more about this topic: United States Tropical Cyclone Rainfall Climatology
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