Area Forecast Discussion
Issued by NWS Pocatello, ID

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FXUS65 KPIH 221041

Area Forecast Discussion
National Weather Service Pocatello ID
341 AM MST Wed Jan 22 2020

A weak system continues to push through the area this morning
producing snow across the southern and eastern Highlands. Earlier
across the Snake Plain, mostly rain was observed with snow
briefly in some spots. Precip will continue to move east this
morning with areas along the Wyoming border expected to see the
highest snow amounts and even this should be limited to an
additional 1-2 inches at the most at this point and this will be
across the highest elevations.

As we progress through the remainder of the work week and into the
weekend the weather pattern across the northwestern U.S. looks to
remain active with a series of systems moving through the region.
The first of which looks to swing through the area Friday producing
mountain snow while valley locations will vary between rain/mix/snow
depending on location and time of day. Still a fluid situation as
we`ll have to fine-tune the timing of precip over the next 24-36
hours to get a better idea of when the most precip will move through
a specific area and thusly precip type as snow levels will be
hovering around and just above valley floors especially during the
afternoon and early evening hours as temps will be running above
climatological norms. Weak ridging builds over the area late Friday
into Saturday before this breaks down late into the weekend and
another system approaches Sunday and into the morning hours Monday.
Once again, this looks like another mountain snow, valley rain/mix
type event with marginal temperature profiles across the lower
elevations but will have to continue to watch how things progress
over the next few days. Near the end of the current forecast period,
temps look to cool a touch perhaps allowing the next weather maker
to be more of a snow event area-wide but still lots of time to watch
this feature as well. McKaughan


CIG and VIS concerns are noted morning at PIH, IDA and DIJ due to
fog/mist and snow and rain showers. As a whole, showers and
lowered CIG/VIS conditions are forecast to remain until early
afternoon at these sites, however, uncertainty in fog development
versus a stratus layer is evident at these sites. This will
determine if VIS or CIG is the primarily concern. CIG at IDA may
not improve at all this afternoon but we currently have it
improving mid-morning. The low CIG will return after 00z for DIJ,
PIH and IDA tonight. SUN is forecast at VFR status while DIJ is a
tough call initially; we have placed them at a MVFR CIG this
morning with improvement during most of the day before dropping
CIG again tonight. ND


An Air Quality Advisory is currently in effect for Franklin
County this morning however precipitation is moving through the
region. Flow in the mid layers of the atmosphere has shifted today
and will be becoming more northwesterly as the day progresses.
Decreasing chances for additional precipitation are forecast today
however the likelihood for rain/snow increases once again
tonight. Additional chances for showers arrive later in the week
as well. These changes in atmospheric conditions should be enough
that it is probable the advisory will be allowed to expire today.
It is worth noting that high pressure rebuilds over the Idaho/Utah
border on Saturday. ND



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