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Every February Yosemite waterfall turns to lava

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In this undated handout photo provided by the Yosemite National Park Service, the …

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In this undated handout photo provided by the Scott Gediman of the Yosemite National …

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In this undated handout photo provided by the Yosemite National Park Service, the …

YOSEMITE NATIONAL PARK, Calif. (AP) — A window of time just opened in Yosemite National Park when nature photographers wait, as if for an eclipse, until the moment when the sun and earth align to create a fleeting phenomenon.

This marvel of celestial configuration happens in a flash at sunset in mid-February — if the winter weather cooperates. On those days the setting sun illuminates one of the park's lesser-known waterfalls so precisely that it resembles molten lava as it flows over the sheer granite face of the imposing El Capitan.

Every year growing numbers of photographers converge on the park, their necks craned toward the ephemeral Horsetail Fall, hoping the sky will be clear so they can duplicate the spectacle first recorded in color in 1973 by the late renowned outdoors photographer Galen Rowell.

"Horsetail is so uniquely situated that I don't know of any other waterfall on earth that gets that kind of light," said Michael Frye, who wrote the book "The Photographer's Guide to Yosemite."

"How many are perched on a high open cliff? Most are in an alcove or canyon and won't get the sun setting behind it. Yosemite's special geography makes this fall distinctive," he said.

Four decades ago, photographers had only to point and shoot to capture another famous Yosemite firefall — a man-made cascade of embers pushed from a bonfire on summer nights from Glacier Point.

But photographing Horsetail is a lesson in astronomy, physics and geometry as hopefuls consider the azimuth degrees and minutes of the earth's orbit relative to the sun to determine the optimal day to experience it. They are looking for the lowest angle of light that will paint Horsetail the colors of an iridescent sunset as rays reflect off granite behind the water. It materializes in varying degrees of intensity for the same two weeks every year.

"If you hit it at just the right time, it turns this amazing color of gold or red-orange," said Frye, a photo instructor with the Ansel Adams Gallery in the park.

Adams photographed the fall, but his iconic black and white images do not capture its fiery quality, and it's unclear whether he ever noted it.

To be successful in photographing the watery firefall, it takes luck and timing, and the cooperation of nature. Horsetail Fall drains a small area on the eastern summit of El Capitan and flows only in the winter and spring in years with adequate rain and snow, which is scarce this year. Experts say it doesn't take a lot of water for the fall to light up.

Most important, the southwestern horizon must be clear, and February is the time of year when storm clouds often obscure the setting sun.

When conditions come together, the scrawny Horsetail Fall is the shining star of a park famed for its other waterfalls — raging Yosemite Fall and Bridalveil Fall. But Horsetail is the longest free-falling one, with a drop of 1,500 feet before it hits granite and spills another 500.

The fire lights up around dusk and lasts for about two minutes. The best views are east of El Capitan along the main roads into and out of Yosemite Valley. Most photographers gather at the El Capitan picnic area, a small pullout marked only by a sign with a table etched on it. But park officials say the inexperienced can look for the hordes of tripods and cameras to find a vantage point.

Recent storms and snowfall mean the finicky fall is flowing again, and park officials are hopeful it will last through February 24, which is generally the last day of the year it can be seen. Once an obscure event, park officials say that Internet discussions have made it more popular in recent years.

The popularity is reminiscent of an actual fiery fall that entertained guests in the park from 1930 to 1968. Each summer evening as the sun set, employees of the park concessionaire would build a huge red fir bark fire atop Glacier Point. At 9 p.m., as the fire burned down to embers and the Indian Love Song waned, someone would yell, "Let the fire fall!"

With long rakes men pushed glowing coals over the 3,200-foot cliff.

Had visitors looked in the opposite direction at a different time of year they would have seen the watery fire-fall of nature.

"There's no comparison, and I've seen both," said park spokesman Scott Gediman. "The natural activities and occurrences in Yosemite are far more amazing and more valuable than the human-made ones — everything from a sunset to wildlife to rainbows at Vernal Fall. There are a lot of amazing things, and they're here year after year."