Area Forecast Discussion
Issued by NWS Pocatello, ID

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FXUS65 KPIH 192150
AFDPIH

Area Forecast Discussion
National Weather Service Pocatello ID
350 PM MDT Wed Jul 19 2017

.DISCUSSION...Monsoonal moisture will infringe upon the region
beginning tonight as a cold front works into the Pacific
Northwest. Could see a few isolated storms across the southeast
highlands tonight. Better chances across both the eastern and
southern highlands Thursday afternoon as the front approaches
eastern Idaho. The front should pass through the region Thursday
night resulting in dry weather for the weekend. However
temperatures will not cool down much because the air mass behind
the front will have modified significantly. Looks like a healthy
push of monsoonal moisture returns early next week which will
result in the next threat for thunderstorms. Valle
&&

.AVIATION...Skies will actually be clearer this afternoon/evening
than this morning as some moisture exits. However, some mid- to high
level moisture is moving in from the south tonight and will develop
CIGs just below 500mb/18000 MSL. By Thu morning, some lower level
moisture will have also worked its way into the extreme southeast
corner of the Gem State. Thus some -SHRA at KPIH and KDIJ is
possible in the morning and -TSRA are possible at KPIH and KDIJ for
Thu afternoon. KSUN is expected to stay extremely dry with only a
brief CIG late tonight. Some gusty wind in the afternoon is
possible, but should be the usual west to southwest and aligning
with the valley airdrome runways. Messick
&&

.FIRE WEATHER...Updated forecast to include at least a headline
for gusty winds with the marginal event in the Central Mountains
Thursday afternoon. See previous dicussion below. Wyatt/Huston

Weak trough moving through tomorrow will kick up the wind in exposed
higher elevations, enough so that, if fuels at the higher elevations
were receptive, it would be a critical weather day. But that is not
the case, so now Warnings or Watches have been issued. Wind will
subside by the weekend. The weak trough will bring up some moisture
for the southeast corner of the Caribou-Targhee NF and surrounding
BLM lands. Expect enough instability and moisture for isolated dry
thunderstorms and some light shower activity. It will boost minimum
humidity in this area as well. The cloud cover should continue into
Fri, along with a thunderstorm threat. Humidity will quickly dry out
once sunshine gets back during the weekend. Showers and
thunderstorms return to the area from the southwest at the beginning
of the week, Mon in the southern highlands and central Idaho
mountains, Tue elsewhere. Messick
&&

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

$$



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