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Tropical Storm Simon to Bring Rain, Possible Flash Flooding to the Four Corners

6 Oct 2014, 4:48 pm

simon track

The monsoon season may officially be over in the Desert Southwest, but the threat for heavy rain is expected to go up later this week. Why? Well, another tropical system in the eastern Pacific — which is likely to become extra-tropical by Tuesday morning — is slowly moving toward Baja California. Form there, it’s expected to push into southern parts of Arizona, syphoning ample moisture into the normally-arid region.

Models indicate that 1 to 2 inches of rain are possible. Locally heavier amounts of 3 to 4 inches of rain isn’t totally out of the question either.

Rain, in the western part of Arizona, could begin falling as early as late Tuesday afternoon. But, the lion’s share of the rain wont start until midday Wednesday. Places like Tucson and Phoenix could expect light to moderate rain, but there could be some heavier downpours as well. Rain will begin to spread north late Wednesday into early Thursday, bringing additional rainfall to Phoenix and the surrounding areas.


The influx of rain will increase the threat of flash flooding in the rain-weary region. If you live in flood prone areas it’s a good idea to stay weather aware through the remainder of the week. If you see a flooded out road, use some common sense and don’t drive through it. Six inches of fast-moving water is enough to push a small car down stream.

Scattered showers will hang around much of the Four Corners region though the end of the week, as the moisture associated with Simon spreads over much of Colorado and New Mexico. The flash flooding threat won’t be a high for Colorado and New Mexico, but some localized flooding — especially on canyon roads — is possible.

Total rainfall amounts in Colorado and New Mexico will be in the neighborhood of 0.75 to 1.5 inches. Some locations could see as much as two inches of rain.

Meteorologist Alan Raymond

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