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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 National Weather Service said Sunday that the monsoon season this year in the arid Southwest dropped only 0.15 inches (.38 centimeters) of rainfall from June 15 to September 30.
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 National Weather Service office in Las Vegas recorded 0.88 inches (22 mm) of rainfall, which was the wettest day in September in 11 years. [ 15 ] More than 4,000 power outages occurred, and 108 flights were cancelled, along with 673 delayed flights at Harry Reid International Airport . [ 16 ]
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.
Following the driest monsoon season on record in 2020, one of the wettest monsoons on record across the Southwest occurred in 2021. 'Normal to above normal rain' expected for Arizona monsoon ...
August is the wettest month (0.93 in (24 mm)), while June is the driest (0.02 in (0.51 mm)). On September 8, 2014, the city of Phoenix recorded its single highest rainfall total by the National Weather Service with 3.30 in (84 mm), breaking the 75-year-old record of 2.91 in (74 mm), set on September 4, 1939. [19]
The last rounds of showers and thunderstorms associated with the North American monsoon are on deck as a big change in the weather pattern will soon end the tropical influx of moisture over the ...