Area Forecast Discussion
Issued by NWS Pocatello, ID

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FXUS65 KPIH 231147 AAA

Area Forecast Discussion...UPDATED
National Weather Service Pocatello ID
547 AM MDT Mon Apr 23 2018

.UPDATE...We did a quick update a bit ago to lower snow levels
under the main frontal band to between 6000-6700ft across the
eastern highlands and also along the Montana border to near Monida
Pass. Snow is heavy enough at time to accumulate and create slick
or slushy roads.  Keyes


.PREV DISCUSSION... /issued 151 AM MDT Mon Apr 23 2018/

SHORT TERM...Today through Wednesday night. A decent band of
rain/high mountain snow (along with a few thunderstorms) continues
to shift east early this morning. As the low itself moves over
eastern Idaho, it will starting digging more to the southeast.
This will actually help drive showers, along with a more
consolidated convergence band, south across the area this
afternoon. We can expect a few thunderstorms, mainly along and
east of I-15 but in reality...this pattern lends itself for a
thunderstorm anywhere we get something going. Additional
precipitation amounts will be less than 0.10" rain/1.0" snow in
most cases after 6am. There will likely be some higher amounts
across the Upper Snake Highlands and anywhere we get stronger
showers/storms developing in the afternoon. It will be breezy at
times outside of convection, 15-25mph with locally higher gusts.

After today, high pressure builds again across the west as a
blocking pattern tries to set up. The pattern shifts slightly west
Wednesday, allowing a storm to clip the Divide. This should have
no impacts on eastern Idaho. Otherwise, warm and dry weather
returns with 70s returning by Wednesday. Look for chilly mornings
and warm afternoon due to dry air settling in over us. Keyes

LONG TERM...Thursday through Monday.

Very warm and dry conditions will continue into
late week. Then, looks like a low pressure system works into the
Pacific Northwest. This will produce a threat of showers and
thunderstorms heading into next weekend. Confidence remains low
right now which is reflected in precipitation chances.


A low pressure system will move into the region today. This will
produce breezy conditions along with scattered showers. Some lower
ceilings are possible around showers.


HYDROLOGY...The warmer temperatures have begun to extend into the
mid-level reaches with enhanced snowmelt producing bankful flow on
the Blackfoot River above the Blackfoot Reservoir Sunday morning
where a flood advisory has been issued through Monday. Strongly
warmer temperatures over the latter half of the week will help to
bring off some of the snow pack in the higher elevations with river
rises anticipated heading into next weekend. Huston



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