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Simon to Cause Flash Flood Risk in Southwest US

By By Kristina Pydynowski, senior meteorologist
October 08, 2014, 5:57:27 AM EDT

Simon will continue to weaken prior to reaching Baja California, but moisture from the diminishing system will impact a portion of the Southwest into the end of this week with heavy rainfall.

Simon has weakened into a tropical storm after reaching its peak intensity of 130 mph Saturday night. The once-Category 4 hurricane is now passing over cooler water and lacks any fuel for further strengthening.

Prior to the center of Simon making landfall in Baja California, rain and thunderstorms will spread northeastward.


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The first showers and storms were arriving in the deserts of southern Arizona and parts of Southern California on Tuesday.

More numerous downpours will unfold on Wednesday in Arizona, including Phoenix, Yuma, Tucson and Douglas. Downpours will also drench western portions of New Mexico, including Silver City and Gallup on Wednesday.

A couple of showers and thunderstorms will extend into the Albuquerque, New Mexico, area, threatening to interfere with the Albuquerque International Balloon Fiesta.


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Rainfall from Simon will overlap some of the area hit by flooding from Odile during September.

There is a risk of localized flash flooding from Simon it pushes inland as a tropical rainstorm. Normally dry washes and arroyos may turn into raging waterways, while mudslides could occur over the higher terrain.

RELATED:
Latest Statistics on Simon
Southwest U.S. Interactive Radar
AccuWeather.com Hurricane Center

As the thunderstorms commence, the danger of the winds kicking up blowing dust and haboobs will also exist in the deserts.

Moisture from Simon will likely spread farther to the north and east late in the week, interacting with another storm system and causing thunderstorms to return to Colorado and enhancing rainfall in parts of Texas and the southern and central Plains.


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Know when the rain will hit by using AccuWeather's MinuteCast™. It has the minute-by-minute forecast for your exact location. Type your city name, select MinuteCast, and input your street address. On mobile, you can also use your GPS location.

The bulk of the rain from Simon is forecast to stay east of the major agricultural areas of California, such as the Sacramento and San Joaquin valleys. Some rain will fall on areas from San Diego to the Mohave Desert. Ironically, some of the heaviest downpours will affect the deserts.


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