Glimpses of rare graupel in parts of western valley

Soft snow pellets drop; often mistaken for hail

Don’t call it sleet, snow or hail.

Parts of the western Las Vegas Valley on Tuesday grappled with graupel, a somewhat unusual form of precipitation in which snowflakes become coated with supercooled water droplets.

Graupel, also known as snow pellets, falls from nimbus or cumulonimbus clouds, the same types that produce snow or thunderstorms, according to the National Weather Service.

It is formed when the snowflakes in the clouds encounter the supercooled water, which is still liquid even though it is below freezing.

The water droplets then freeze onto the snowflakes, giving the graupel a round shape. The weather service described it Tuesday as being softer and lighter than hail.

The first reports of what residents took to be hail came in shortly before 10:30 a.m., the weather service said.

“Soft little ice pellets coming off the mountains are hitting the ground,” meteorologist Alex Boothe said. “But it’s nothing that’s going to be impactful to anyone.”

The graupel was widespread across the valley and seemed to stop by 2 p.m., meteorologist Clay Morgan said Tuesday evening.

As was the case in the Las Vegas Valley on Tuesday, graupel can fall when temperatures are well above freezing on the ground.

In addition to graupel, parts of the valley saw some snowflakes. And many more areas experienced onand-off showers throughout the day. The intermittent rain was accompanied by light winds of about 15 mph, with gusts up to 20 mph.

By about 6:30 p.m., most of the valley only saw about one-tenthof an inch or less of precipitation, Morgan said.

Clear skies are expected the rest of the workweek, with forecast highs of 48 on Wednesday and Thursday and 52 on Friday. Lows should remain in the low 30s through the week. The average high this time of year is 60, the weather service said.

Contact Jessica Terrones at jterrones@reviewjournal.com or 702-383-0256. Follow @Jessaterrones on Twitter. Review-journal staff writer Katelyn Newberg contributed to this report.

Bizuayehu Tesfaye Las Vegas Reviewjournal @bizutesfaye Shiv Bonman of India on Tuesday digitally captures wife, Uma, and son, Atharva, 2, with Red Rock Canyon in the background.