FYI - there is a flash flood watch for the Glacier NP region:

...FLASH FLOOD WATCH REMAINS IN EFFECT FROM 3 PM MDT THIS AFTERNOON THROUGH THIS EVENING... THE FLASH FLOOD WATCH CONTINUES FOR * A PORTION OF NORTHWEST MONTANA. * FROM 3 PM MDT THIS AFTERNOON THROUGH THIS EVENING * STRONG THUNDERSTORMS WILL BRING VERY HEAVY RAIN, THAT WILL HAVE THE POTENTIAL TO CREATE ROCK AND MUDSLIDES ALONG STEEP TERRAIN, AS WELL AS RECENT BURN SCARS AND FLOODING IN URBAN AREAS. RAINFALL RATES OF ONE HALF INCH OR MORE IN THIRTY MINUTES ARE EXPECTED WITH STRONGER STORMS. * AREAS OF CONCERN INCLUDE: HIGHWAY 2 KALISPELL TO LIBBY, MUD CREEK IN THE GIBRALTER RIDGE BURN AREA, SYLVAN CREEK CAMPGROUND IN MOOSE CREEK BURN, WEST FORK BURN AREA, GOING-TO- THE-SUN ROAD IN GLACIER PARK, HOWE RIDGE BURN AREA IN GLACIER PARK, SPRAGUE BURN AREA IN GLACIER PARK, HOT SPRINGS, AND KALISPELL. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. &&