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Monsoonal rains blocked in Southwest Colorado; dry spell continues

Summer months have been drier than average
Good winter and spring moisture has allowed wildflowers to thrive late into summer above Silverton.

Monsoonal rains did not materialize much this summer in the Four Corners, and the El Niño weather phenomenon that favors a wetter-than-normal winter is also over.

“A more persistent high-pressure ridge than expected over the Four Corners is blocking the southerly monsoonal flows,” said Jim Andrus, a Cortez weather observer for the National Weather Service. “The dry spell will continue into next week.”

July and August were both below normal for precipitation for Durango and Cortez.

In July, Durango received 0.69 inches of rain, or 40% of the normal average of 1.72 inches, and so far in August, Durango has received 1.18 inches, or 89% of the normal 1.33 inches.

In Cortez, July saw just 0.45 inches of rain, or 35% of the normal average of 1.28 inches, and August has seen just 0.57 inches of rain, or 39% of the normal 1.48 inches.

The lack of moisture has put Southwest Colorado into the “abnormally dry” category on the U.S. Drought Monitor, the least severe of five drought levels.

“Far into the monsoon season, the rains continue to fail in the Southwest,” according to the Drought Monitor. “Only the abundant precipitation that fell last winter is keeping substantial impacts at bay so far this summer.”

Year-to-date precipitation in Durango is at 11.31 inches, or 119% of average, and Cortez is at 11.2 inches, or 144% of average, because of the above-average snowfall in late winter. But the high percentage continues to drop as the dry spell continues.

There is still a chance the Four Corners could get a shot of late-season monsoonal rains, Andrus said, if the high-pressure ridge shifts to the east.

The September forecast hints at a chance for slightly above-average precipitation, said Jeff Colton, a meteorologist with the National Weather Service, as the early winter northwesterly storms drop this way.

Above-average snowpack last winter has kept Southwest Colorado precipitation totals above average for 2019, but a dry spell has recently crept in.

It’s in a neutral pattern that is neither El Niño, or its opposite, La Niña, which is characterized by cooler Pacific temperatures with an atmospheric tendency to push winter storms toward the Northwest.

According to NOAA’s Climate Prediction Center, there is a 55% chance the neutral pattern will continue through the winter, a 30% chance El Niño will return and a 15% chance La Niña will form.

“There is a sign that a weak El Niño may come back in late winter, bringing potential for wetter spring storms,” Colton said.

Oct 9, 2019
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