593 
FXUS65 KPIH 101956
AFDPIH

Area Forecast Discussion
National Weather Service Pocatello ID
156 PM MDT Wed Oct 10 2018

.DISCUSSION...The low pressure system that brought widespread 
rain and snow is pulling away from the region. An upper level 
trough is helping to push the low away from the area and that 
trough is causing a few light rain/snow showers to develop this 
afternoon across the central mountains into the upper Snake 
highlands. Models show showers persisting through the night, 
mainly in the Island Park area where an additional 2 inches is 
possible. Some patchy fog is possible late tonight and early 
Thursday morning. Winds will be mainly light and the lower 
atmosphere is very moist. Should see clearing conditions on 
Thursday as high pressure settles into the region. Looking at a 
back door cold front arriving on Saturday from the Yellowstone 
area. This may produce a few light showers across portions of the 
central mountains and eastern highlands. More importantly, we'll 
see a reinforcing shot of colder air with a killing freeze looking
more likely for the eastern Magic Valley. Remainder of the 
forecast looks dry.

Valle

&&

.AVIATION...Ceiling and visibility should improve at all airports 
for the afternoon and early evening, however the boundary layer 
moisture is so high after all the rainfall that stratus, and 
potentially fog, will wreak havoc with airdrome openings in the 
morning. Expect marginal VFR conditions, and the potential is for 
worse, especially KBYI and KPIH where rainfall has exceeded one inch 
and a half inch, respectively. The area least likely to be affected 
in the morning is KSUN, if the northwest wind is strong enough. But 
watch for mid-day stratus problems as a potential when the wind 
shifts to southeasterly at that time. Messick

&&

.FIRE WEATHER...The heaviest rain is over as of today, but slight 
chance to chance of showers, both rain and snow, will continue until 
clearing begins in Idaho, moving from west to east until it clears 
out of the ID-WY border on Thu afternoon/evening. Very dry and cold 
air will move into the fire weather area for Fri through the 
weekend, with temperatures staying below normal for this time of 
year until mid-week. High elevation locations may get some very dry 
air that will challenge the 15 percent critical threshold, but that 
does not last long. The north end of the forecast area will 
experience breezy and gusty conditions Fri night/Sat as a dry cold 
front pushes through, with downslope northerly wind nearly all day 
on Sat. Outside of the areas from Idaho Falls northward, the only 
effect from the front will be clouds and the high temperatures 
turning colder on Sat. Warming and drying resume, with high pressure 
and clear skies dominating the weather pattern until above normal 
temperatures return on Wed. Messick

&&

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

$$