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Monsoon Season is Here - Get Ready for Some Wild Arizona Weather!
For years before moving here I heard about the Arizona monsoon season from my sister-in-law.  She would tell me about the atmospheric pressure building up, the rising humidity levels, and the lightning.  She'd also tell me about the dust storms that would most often preceed the rains.  Then she explained that you wanted the rain because that would cool things off and the "pressure" would be relieved.  And last but not least, she would end her musings with how much she enjoyed the monsoon season.
Living in Seattle, and not having experienced an Arizona monsoon storm first hand, I really had no concept of what to expect after moving here..
Before this year (2008), the beginning of the monsoon season was determined by having three consecutive days with dew points of at least 55 degrees.  (HUH?  In Seattle we had 10 different names for varying degrees of precipitation but this AZ weather terminology was a whole different animal).
This year the National Weather Service decided to change it to set dates beginning June 15 and ending Sept. 30. That ends the weather service's decades-old system of using dew points to mark the onset of our summer thunderstorms.
As a side note, the earliest start to the traditional monsoon came on June 16, 1925; the ... more

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