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The combination of the rugged terrain and rocky soil conditions are conducive to rapid runoff from (even moderate) showers. This can send water rushing through city streets and remote canyons with little notice. Normally dry stream beds, known locally as arroyos, can rapidly fill with water and become raging torrents.
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People living in or traveling through the region, including hikers and campers, should be alert for changing weather conditions. A downpour miles away and upstream from a location can lead to flash flooding even where no rain may be actively falling.
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This image shows the speed of a flash flood in the Flagstaff, Arizona, area on July 13. (Image/City of Flagstaff) |
The flow of moisture from the Gulf of Mexico and the Gulf of California that produces the shower and thunderstorm activity will be persistent, "although the intensity and overall coverage of the rain is likely to vary somewhat from day to day," AccuWeather Senior Meteorologist Dave Bowers explained.
The showers and thunderstorms are forecast to continue over the interior Southwest through this week, but thunderstorms and sporadic downpours could expand during the weekend.
end partial quote from:
https://www.yahoo.com/lifestyle/southwest-monsoon-continues-bring-dangerous-190539639.html
This is a time for all travelers and locals to be very very careful because almost anything could happen flood or lightning or mud with the soil so unreceptive to water at this time because all the water is going to run off because of how stiff 26 years of drought have made the ground almost everywhere there is desert now. And with El Paso having almost 400% of normal rainfall between the first 15 days of July you can see how potentially dangerous this is for everyone in the southwest subject to these monsoon rains.
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