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Odile will unload tremendous rainfall over a large part of the Southwest United States that will run off the mountains and into the desert valleys and plains through the end of the week.
According to Western Weather Expert Ken Clark, "There is the potential for devastating, catastrophic and historic flooding in this scenario." . . .
The heaviest rainfall will hit the Southwestern states of Arizona and New Mexico where a general 3 to 6 inches will fall, but local amounts of 10 inches or more are possible on the slopes of the mountains. Rainfall of 1 to 2 inches per hour can occur.
There is a significant risk to lives and property in the region.
"Not only will flash and urban flooding occur in this case, but there is the potential for major river flooding," Clark said . . .
"Travel on Interstate-10 between El Paso, Texas, and Phoenix will be dangerous," Clark said
The rain from Odile is coming just one week after moisture from Norbert drenched the region, creating major flooding. Norbert caused a daily record rainfall of 3.29 inches at Phoenix earlier in September.
The combined rainfall from Norbert and Odile has the potential to cause September to be the wettest month ever in some areas. For example, during August of 1955, 7.9 inches of rain fell at Tuscon, which set the mark for the wettest month since records began in 1895. Thus far this month, about 2.5 inches of rain have fallen at Tuscon.
While our rainfall forecast above lays out a general area of heaviest rain, keep in mind heavier rain may fall in localized areas in the most persistent thunderstorm clusters. Some rainfall records may be threatened throughout the desert U.S., including Tucson's daily precipitation record of 3.93 inches that was set on July 29, 1958. Tucson's wettest September on record occurred in 2011, when 5.6 inches fell throughout the month. It is possible that that much rain may fall in Tucson this week.