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...all around the end-of-the-year holidays, so I couldn't IMAGINE a monsoon
here either.
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From the Pima Community College website
http://wc.pima.edu/Bfiero/tucsonecology/climate/seasons.htm.
MONSOON SUMMER: June - September. Beginning in 2008, the monsoon period in Tucson offically
extends from June 15 - September 30. Before 2008, the monsoon period began officially after 3
consecutive days with daily mean surface dew points of 55 degrees F or greater (representing
an influx of moisture into our area). The increase in dew point occurs when the prevailing winds
shift from westerly to southeasterly, bringing more moisture in from the Gulf of California (mostly)
and Gulf of Mexico. Days often begin clear and very warm, but as the heat of the day builds,
huge clouds build and tower above (see Why it Rains), cooling the temperatures somewhat
(but increasing relative humidity) and often dumping huge quantities of rain in a very short
time. This is the time of wind and dust, flashfloods and lightening. .
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An incredible amount of rain falls in relatively short periods of time, usually in the afternoons --
the humidity can be beastly combine with our (normally dry and comfortable) heat.
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Trouble is, if we don't get enough rain at other times of the year, the rain we DO get ends up
mostly as run-off due to our not-very-receptive desert "ground".
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The lightning storms (and I'm a frustrated storm-chaser) are the most incredible light-shows
I've seen ANYWHERE else in the world.
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