The entire length of Glacier National Park’s Going-to-the-Sun Road reopened Tuesday after crews had cleared debris from mud and rock slides that blocked the road on Tuesday, but the National Weather Service is forecasting severe weather for today with more flash flooding that could impact the park.

A 16-mile stretch of the road was closed Tuesday afternoon between Avalanche Creek and Logan Pass after heavy rains caused a dozen rock and mud slides that trapped about 150 vehicles. A one-lane path was cleared that evening to get vehicles and people out of the closure area.

But cleanup efforts continued through Thursday morning, and the closed section was reopened at 2:30 p.m. Thursday.

The National Weather Service has announced a severe weather warning for Northwest Montana from noon to midnight today due to an incoming pacific weather system combining with the remnants of a tropical weather system.

Lincoln and Flathead counties, as well as Glacier National Park are under a flash flood watch for the day and night, with potential for rainfall rates of as much as 2 inches per hour.

“In particular in Flathead County, Glacier Park will be under the gun again, under the threat of additional rock and mud slides above Going-to-the-Sun Road,” said Dan Zumpfe, a Missoula-based meteorologist. “Even small rainfall may impact the road.”

Zumpfe said the storm system could bring hail as large as 1 inch in diameter and will bring lightning across the region. He advises recreationists and those involved with outdoor events to be prepared.

Due to the forecast, Glacier National Park has canceled its planned Star Party at Logan Pass. Another Star Party is scheduled for Aug. 17, and normal astronomy programming at St. Mary and the Apgar Transit Center will depend on weather conditions.