Flood Potential Outlook
Issued by NWS Great Falls, MT

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FGUS75 KTFX 221853

Hydrologic Outlook
National Weather Service Great Falls MT
1253 PM MDT Sun Apr 22 2018

...Increased Flooding Threat this Week Across Southwest

Two factors will contribute to a higher potential of flooding
across parts of Southwest Montana this week. 1) A moderate rain
and wet snow event tonight through Monday morning and 2) above
normal temperatures returning later this week.

Later today through tonight, a storm system will bring moderate
rain and wet snow to much of Southwest Montana. Initially, snow
levels will be around 8000 to 9000 feet this evening, before
falling down to around 4500 feet or so by Monday morning. This
means rain is likely even at mid-elevations initially. 0.10" to
0.30" of rain is expected before the transition to snow occurs.
At lower elevations, rainfall amounts will likely be a bit higher
before the transition occurs.

The remainder of the work week looks dry, but temperatures will
warm back above normal by the end of the week. This will translate
to 60s and 70s at lower elevations and 50s at mid elevations.

Snowmelt has already caused some small stream and creek flooding
in Madison County, per local Emergency Management. The rain and
wet snow may exacerbate some of the flooding in that area through
Monday. As temperatures warm through the week, mainstem rivers in
this area will likely begin to rise, including the Big Hole,
Jefferson, and Missouri Rivers. Stay tuned for updated flood
information through the week.

Those in known flood-prone areas, or any location near rivers,
streams, or creeks are encouraged to begin thinking ahead about
the possibility of flooding developing this week. If flooding is
observed, please report it to local law enforcement, and ask them
to pass it on to The National Weather Service in Great Falls.



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