A meteorologist says the threat of flooding has shifted to the southwestern part of Montana.

Ben Schott of the National Weather Service says the Big Hole, Jefferson and Gallatin rivers all could see major flooding by Memorial Day or the first weeks of June as the deep snowpack melts with the sudden rise in temperature.

Schott says the cool, wet spring had kept the snowpack intact
until now.  He says storms have saturated the ground so much that any
significant rainfall will result in the rise of the state's streams
and rivers.
That's what has happened in southeastern Montana, where storms
dumped up to three inches of rain between Sunday and Tuesday and
caused the Tongue and Powder rivers to rise about nine feet in 24
hours.