Hurricanes bring heavy rain, but they bring heavier rains as the world warms, and the air holds more moisture (until conditions change and the moisture falls).http://www.wunderground.com/news/southwest-flooding-update-20140908?MR=1
Phoenix Flooding: Interstate 10 Flooded, 30 Cars Submerged, Record Wettest Calendar Day Due to Norbert's Torrential Rains
By Sean Breslin
Published: September 8, 2014
Record rain flooded swamped freeways, stranding drivers in the Phoenix metro area Monday morning.
According to The Weather Channel meteorologist Mike Seidel, about 30 vehicles were submerged on Interstate 10 near 43rd Avenue in the west Phoenix metro. Stretches of Interstate 17, U.S. 60, and L-202 were also flooded for a period of time Monday.
Numerous schools were closed due to the weather. APS reported about 10,000 customers without power in the metro area, with flooded roads making restoration a challenge.
Phoenix Sky Harbor International Airport set an all-time wettest calendar-day record, picking up 3.29 inches of rain since midnight as of 8:56 a.m. MST., breaking the previous record set 75 years ago. This is more than the average rainfall in July, August, and September, combined (2.69 inches), encompassing a typical summer rainy season, there.
According to NOAA's precipitation frequency estimate, this heavy a precipitation event in a six-hour time period has only a 0.002 percent (2/100,000 = 1/50,000) chance of occurring in any given year.
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