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The North American monsoon provides parts of the Southwest 40 to 75% of its annual rainfall, but many cities across the region are pacing 50 to 80% behind average rainfall amounts since June 15 ...
The departure from the normal rainfall varies widely across northern Arizona, with many places reporting between a half-inch to 2 inches more rain than usual. But the rainfall totals in a few ...
The clock is ticking on the North American monsoon and the annual shift of winds that transport moisture into the western U.S. Vehicles in the Phoenix metro area navigate a flooded street that ...
Summer monsoon rain over eastern New Mexico. The North American monsoon, variously known as the Southwest monsoon, the Mexican monsoon, the New Mexican monsoon, or the Arizona monsoon [1] is a term for a pattern of pronounced increase in thunderstorms and rainfall over large areas of the southwestern United States and northwestern Mexico.
Gulf moisture is typically constrained to central and southern Arizona by the topography of the Mogollon Rim. The moderate steering flow from the surge pushes the convection off the mountains which brings precipitation to the desert valleys. Precipitation from gulf surge events can produce locally heavy rainfall which result in flash floods.
On August 24, 1951, the moisture from a hurricane that made landfall in Baja California moved over the state, producing more than 5.00 inches (127 mm) of precipitation over southwestern Arizona. Flagstaff saw 4.00 inches (102 mm) of rain, with similar totals measured at Prescott (3.95 inches; 100 mm) and Phoenix (3.24 inches; 82 mm).
[citation needed] When active, the monsoon raises humidity levels and can cause heavy localized precipitation, flash floods, hail, destructive winds, and dust storms [17] —which can rise to the level of a haboob in some years. [18] August is the wettest month (0.93 in (24 mm)), while June is the driest (0.02 in (0.51 mm)).
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