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Will Hurricane Norbert soak Colorado?

Big surge of subtropical moisture possible early next week

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Moisture will be plentiful across Colorado and much of the U.S. the next 5 days.

STAFF REPORT

FRISCO — Hurricane Norbert, now spinning off the coast of Baja, California, could deliver copious amounts of moisture to Colorado early next, according to the National Weather Service, which is already talking about the potential for regional flash flooding.

The Category 3 storm is expected to weaken gradually during the next few days as it moves northwest over cooler water, but the projected path turns the remnant low pressure system eastward, coming ashore over northern Mexico or southern California late in the weekend.

The exact path will determine how much rain falls in Colorado, but National Weather Service forecast maps are showing widespread rain across Colorado, with a bullseye over the north-central mountains.

Grand Junction-based National Weather Service forecasters say subtropical moisture will increase across the Great Basin and western Colorado Monday as a low pressure area off the SoCal coast directs Nortbert’s remnants and more monsoon moisture northeastward.

Storms will be widespread by Monday afternoon with the potential for heavy rain and small hail, as well as a chance for flash floods and debris flows.

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Dry air (brown) prevailed over Colorado Saturday morning, but Hurricane Norbert may help boost another surge of late-season monsoon moisture poised to the south.


		
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Climate: Wet West in July

Energetic monsoon brings moisture surplus to many areas

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The big wet?

By Summit Voice

FRISCO — An energetic and widespread monsoon weather pattern brought above normal precipitation to much of the West in August, with a bullseye of moisture in southern Idaho, extending across western Wyoming, Montana, northeastern Utah and into northwestern Colorado. Some locations in the region saw up to 800 percent of average precipitation. Continue reading

Morning photo: Twilight set

More monsoon

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Clearing late-summer storm over Dillon Reservoir.

FRISCO — Monsoon season just won’t quit in Colorado this year. That’s a boon for mushroom lovers, who continue to report good finds around the high country, and it’s also dampened the fire season across much of the state. But while the stream of moisture feels summer-like, there’s already been a subtle shift in the quality of the light. We’re closer to the equinox than the solstice now, and the sun slants in from a noticeably different angle at sunset. Continue reading

Morning photo: Monsoon skies

Colorado’s wettest season has arrived

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A monsoonal thunderstorm generates a lightning flash over Dillon Reservoir.

FRISCO —

Evening thunderstorms over Peak 1, Frisco, Colorado.

Evening thunderstorms over Peak 1, Frisco, Colorado.

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Colorado: Monsoon arrives right on schedule

Daily rain showers to persist through the weekend

A classic monsoonal flow of moisture, moving clockwise around a

A classic monsoonal flow of moisture, moving clockwise around a high pressure center over the Texas panhandle, is delivering plentiful moisture to parts of the parched Southwest.

By Bob Berwyn

FRISCO — Flashes of lightning, loud thunder and heavy rains Friday marked the start of Colorado’s summer monsoon season. The one- to 2-month period when moist and warm air flows northward from the subtropics may not be as dramatic as the Asian monsoon, but it’s still a critical piece of the state’s overall weather picture, providing abundant moisture just at the time when forests and fields are reaching their driest point. Continue reading

Climate: Southwest tree rings show historic monsoon droughts

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Ancient Douglas firs are helping researchers track historic patterns of drought. Bob Berwyn photo.

New technique focuses on late-summer tree ring growth to pinpoint seasonal climate patterns

By Summit Voice

SUMMIT COUNTY — A detailed new study of tree rings in the Southwest shows that  patterns of alternating wet and dry seasons observed since the 1950s is not the norm. Rather, the analysis suggests that, during historic decadal droughts, both winter and summer precipitation was below the long-term average.

The new 470-year-long history (1539 to 2008) of summer precipitation in the Southwest covers most of Arizona, western New Mexico and parts of northern Mexico. It was established by looking at rings from Douglas firs and ponderosa pines, including tree-ring samples stored in the archives of the University of Arizona Laboratory of Tree-Ring Research. Continue reading

Climate: New clues for ancient Great Basin lakes

Nevada’s Walker Lake is a remnant of one of the great inland lakes that covered parts of the Great Basin during the last glacial cooling period. Image courtesy NASA Earth Observatory.

Glacial climate regime may have enhanced Southwest Monsoon

By Summit Voice

SUMMIT COUNTY — Geologists and paleoclimatologists have long known that the great basins of the intermountain West were once filled with water, forming vast inland seas. At the peak of the last glacial cooling period, about 14,000 to 20,000 years ago as much as a quarter of Nevada and Utah were covered with water.

What’s not exactly clear is where and when the water came from, but a new study led by a Texas A&M researcher offers additional clues, suggesting that the additional moisture came from a powerful, enhanced summer monsoon.

First, the scientists set out to test the prevailing hypothesis that the water resulted from a shift in the winter storm track that now generally carries storm to the north of the Great Basin, into northern California, Washington and Oregon. Continue reading

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