Light snow began falling early Thursday morning along Interstate 40 in the Flagstaff area, according to transportation crews.

Slick roads due to the snow were observed, but no major problems have been reported, tweeted the Arizona Department of Transportation. All highways are open, the Department of Public Safety said.

Around 3:30 a.m., light snow was reported falling between Flagstaff and Williams.

As of 4:15 a.m., light rain and snow showers were seen on radar affecting western and central Arizona, according to the National Weather Service in Flagstaff. Snow accumulations are forecast at an inch or less above 7,000 feet of elevation through noon Thursday.

The bulk of the snow accumulations from this strong Pacific storm should fall later tonight through midday Friday, the weather service said.

Transportation officials also reminded motorists traveling to higher elevations not to park on highway shoulders to play in the snow. Highway shoulders are for emergencies, not snowball fights, they tweeted Thursday. 

Rain for Phoenix area

In the Phoenix area, periods of showers are forecast Thursday. The weather service announced shortly before 7:30 a.m. via Twitter that rain had arrived in the Valley.

Most areas will see a quarter-inch to three quarters of an inch. A few spots will get up to an inch in western Arizona as well as north and east of Phoenix, the weather service tweeted.

High temperatures in the Valley Thursday will be in the low 60s, several degrees below normal, with lows in the 50s, according to a weather service forecast. The temperature Thursday morning at Sky Harbor International Airport was 54 degrees.   

The rain is expected to last through midday Friday with mostly clear skies forecast for Friday night.

The weekend forecast for the Valley calls for sunny skies Saturday and Sunday with daytime temperatures in the upper 60s and lows in the upper 40s.

“A second weather system may bring more chances for precipitation next Tuesday and Wednesday,” according to a weather service forecast.

This story is developing. Check back at azcentral.com for updates.

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