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Fox News Weather Center

Weekly Wrap Up: Snow Blankets High Plains, Rain Inundates Southwest

Early September snowfall blanketed portions of the Rockies and High Plains this week, while treacherous floodwaters stranded commuters in the Southwest.

As of Thursday morning, up to 6-8 inches of snow had accumulated across portions of the Black Hills in South Dakota, and Cut Bank and Lewistown in Montana, marking the season's first snowfall.

Heavy snow arrived early due to cold air building in from the Arctic.

"Many times when we see an outbreak like this, this early in the season, it doesn't last and will go back to normal pretty quickly," AccuWeather Senior Meteorologist Brett Anderson said.

Earlier in the week, remnants of Norbert slammed the Southwest with record breaking rainfall, creating havoc for early-morning commuters in the Phoenix, Arizona, area and a stretch of Interstate 15, north of Las Vegas.

Phoenix received nearly three inches of rainfall in less than seven hours, breaking the previous record from 1933. The ongoing heavy rainfall has prompted Arizona Governor Jan Brewer to declare a state of emergency.

Portions of I-10 were also completely inundated as drivers attempted to cross flooded roadways. Law enforcement in La Paz, Arizona, reported multiple cars were stuck in the high water.

Vehicles floated down I-15 as floodwaters continued to rise near Moapa, northeast of Las Vegas.

Residents in the region were evacuated from their homes in the Moapa River Indian Reservation. Moapa saw more than three inches of rainfall in an hour, according to NWS reports.

Evacuations also occurred in the West as the raging Meadow Fire, which ignited Sunday, promoted the airlift of 85 hikers and climbers out of Half Dome, a popular tourist attraction at Yosemite National Park.

Nearly 100 more were evacuated from the Little Yosemite Valley due to the fire.

Though some rain fell in the early morning hours Monday, it was not enough to contain the blaze.

Several AccuWeather.com Staff Writers contributed to this article.