Flood Potential Outlook
Issued by NWS Pocatello, ID
FGUS75 KPIH 110954
National Weather Service Pocatello ID
254 AM MST FRI MAR 11 2016
...Rainfall and snowmelt combine to risk possible flooding in Blaine
and Custer Counties through Saturday...
A warm and moist air mass continues to move across southwest
and central Idaho. So far, rainfall predictions appear on track,
with locations receiving on Thursday and Thursday night anywhere
from 0.40 to 0.60 of an inch of liquid water above 6000 feet
elevation in northern Blaine County, including Ketchum and the
Galena summit, and western Custer County, including the Stanley
basin. Rainfall will continue today and tonight, with little
variation in the elevation of the rain-snow line.
Run-off from the heavy rain, combined with melting of the snow pack,
may cause areas of flooding not associated with any creek, stream, or
river. This kind of flooding is often called sheet flooding. Sheet
flooding can put ground floors and basements of housing and other
structures at risk for inundation. Property owners should assess the
snowmelt situation for their property and take measures to reduct
the risk of flooding.
By Saturday night, the temperatures in the central Idaho mountains
will turn much colder as a cold front pushes through the region.
This will halt the melting of snow, and in fact should add large
amounts to the existing snow pack with a major late winter storm
arriving late Saturday night and continuing into Sunday night.