303 
FXUS65 KPIH 112007
AFDPIH

Area Forecast Discussion
National Weather Service Pocatello ID
207 PM MDT Wed Sep 11 2019

.SHORT TERM...Tonight through next Wednesday...Low pressure
currently over eastern Montana but moisture is wrapping around the
back side of it this afternoon across Idaho. Showers and a chance
of a thunderstorm will exist and track from north to south through
the early evening hours. Favored areas for precipitation include
the Teton area and Upper Snake River Plain with up to 1/4 of an
inch of rain forecast in these areas. Tonight, with all the
lingering moisture expected in the area, areas of fog are likely
to form across Island Park, the Upper Snake River Plain and Teton
Areas. Fog may also develop in and near the Palisades, Swan Valley
and down to Montpelier. After that, high pressure building in 
from the west and southwest will influence our weather pattern 
through the weekend. Temperatures will steadily climb through the 
Sunday; peaking back to summerlike temperatures into the 80s. We 
continue to watch the progression of a broad upper trough off the 
west coast early next week, which is likely to bring the next 
chance for showers and thunderstorms. Models have been coming into
better agreement tracking this trough/low pressure system into 
our area Tuesday with increasing south and southwest winds 
bringing moisture into the region and continued opportunies for 
showers through Wednesday. NP

&&

.AVIATION...An upper level low over Northwest Wyoming is bringing 
wrap around moisture into our area. Scattered showers and 
thunderstorms are mainly over Central mountains, Upper Snake 
Highlands, Upper Snake River plain the Eastern highlands mainly 
impacting KSUN, KDIJ, and KIDA this afternoon. Lingering low CIGS 
are gradually rising and should be VFR for all sites by mid 
afternoon. With high pressure and drier air moving in, sites should 
remain VFR through evening and tomorrow morning. Expect dry 
conditions Thursday through early next week. Winds will get become 
breezy to moderate Friday through early next week. Wyatt

&&

.FIRE WEATHER...Fuels are much wetter thanks to the past couple 
days of precipitation. Wrap around moisture from a deep upper trough 
will trigger some scattered showers and some isolated afternoon 
thunderstorms mainly for the Central Mountains, Upper Snake River 
plain, Upper Snake Highlands, and the Eastern Highlands. Upper level 
high pressure ridging will begin to build in late tonight into 
tomorrow with drier weather tomorrow and Friday. A shortwave will 
flatten the ridge on Friday creating upper level zonal flow, but no 
precipitation is expected in southeast Idaho. The trough will likely 
trigger some stronger winds in zonal flow across the region. Upper 
level zonal flow will continue so Saturday will be dry and breezy as 
well. Sunday expect even slightly drier and warmer conditions in a 
slightly windier Southerly flow ahead of another moist, cool upper 
level low approaching from the west. Next shot of precipitation will 
be late Monday into Tuesday as the upper level low moves over our 
area. Wyatt

.PIH WATCHES/WARNINGS/ADVISORIES...
None.
&&

$$