Flood Potential Outlook
Issued by NWS Great Falls, MT

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FGUS75 KTFX 091012

Hydrologic Outlook
National Weather Service Great Falls MT
412 AM MDT Tue Apr 9 2019

...Strong Spring Storm to Continue to Impact the Region through

A strong spring storm will continue to bring significant amounts
of rain and snow to Southwest and most of North Central Montana
through Wednesday evening. As of early Tuesday morning, liquid
equivalent totals so far of generally 0.25 to to 0.75 inches have
been observed across the region, with isolated amounts approaching
1.5 inches over the higher terrain.

High snow levels of 5000 to 8000 feet through the afternoon hours
today will lead to the predominate precipitation type over the
plains of North Central Montana, valleys of Southwest Montana,
and up through the mid slopes of the surrounding mountains to be
rain. These snow levels will then gradually fall to around 4000 to
5000 feet by this evening, which will lead to a transition to
snow over most of Southwest Montana and a rain snow mix over parts
of North Central Montana. Additional precipitation amounts
through Wednesday evening of 0.25 to 1 inch are expected, however,
pockets of 1 to 1.5 inches are possible in the foothills and
mountains. Some of this additional precipitation at lower
elevations is expected to fall as snow, with a majority of this
precipitation falling as snow in the mountains.

Rain falling on any existing snow may lead to significant runoff
into area streams, creeks, and rivers. Rises on area streams and
creeks may lead to flooding, especially those that originate from
the mid slopes. In addition, ponding of water may also occur in
low-lying and poor drainage areas. Roads over or near creeks or
streams may experience flooding, while roads near rocky hillsides
may see minor rock slides.



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