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Dew point phoenix1/14/2024 ![]() The operational criterion for the onset of "monsoon" conditions used in Arizona is " prolonged (3 consecutive days or more) period of dew points averaging 55☏" or higher." There is nothing magical, however, about 55☏. In addition, strong moisture influx into Arizona is also required. By that, we mean that the thunderstorms are powered by intense surface heating. Monsoon thunderstorms are convective in nature. Consequently, the proper terminology is "monsoon thunderstorms" not "monsoons." The word should be used in the same manner that "summer" is used. Researchers have proposed the Gulf of Mexico and/or the Gulf of California as the source regions but conclusive evidence has so far been elusive.īy the way, the term "monsoons" as in "when the monsoons arrive. The exact source region for the moisture of the Arizona monsoon is unknown. The southerly winds push moisture north-ward from Mexico. These two features combine to create strong southerly flow over Arizona.
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