704 
FXUS65 KBOI 111548
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
948 AM MDT Thu Oct 11 2018

.DISCUSSION...A few showers were still lingering over the
mountains of central Idaho and also in the western Magic Valley as
of 9:45 am MDT. These showers will decrease through the day and be
gone by evening. A Frost Advisory has been issued for agricultural
zones (the Treasure and western Magic Valleys) for tonight. Low
temps at or below 36 degrees are expected over most of the areas
in the advisory, and this typically leads to widespread frost.
Similar temps are forecast for Friday night, and even colder temps
for Saturday and Sunday nights. A freeze warning may be needed for
Saturday night, but we will see what later forecasts say before
issuing that. Update out shortly to add the headline to the zone
forecast. No changes to the grids were needed.

&&

.AVIATION...Mainly VFR. Areas of mountain obscuration, improving 
this afternoon. Patchy valley fog late tonight and Friday morning. 
Light surface winds becoming NW 5-10kt this afternoon. Winds aloft 
at 10k feet MSL north 10-20kt. 

Weekend outlook...VFR with mostly clear skies. North to northwest 
surface winds 10-20 kts Saturday afternoon and evening.

&&

.PREV DISCUSSION...
SHORT TERM...Today through Friday...Isolated showers in the
Western Magic Valley and Southern Twin Falls County will end by
noon as an upper trough moves to the south of the area. A dry 
northerly flow aloft will follow the exiting trough, resulting in 
decreasing clouds. Patchy fog in the northern valleys this morning
will dissipate by noon. The northerly flow aloft will transition 
to northwesterly on Friday for continued mostly clear skies. 
Temperatures will be warmer today with highs mainly in the 50s. 
The warming trend will continue on Friday with highs mainly in the
mid 50s to mid 60s. Winds will be light.

LONG TERM...Friday night through Wednesday...A cold front in 
Montana will bring a reinforcement of cooler air from the north on
Sunday. Precipitation will stay well east of the area. 
Temperatures will be around 10 degrees below normal. Upper level 
ridging begins to build across the region on Monday and will move 
overhead by Wednesday. This will bring a warming trend, with near 
normal temperatures by Wednesday. 

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...Frost Advisory from midnight tonight to 10 AM MDT Friday 
     IDZ012-014-016.
OR...Frost Advisory from midnight MDT /11 PM PDT/ tonight to 10 AM 
     MDT /9 AM PDT/ Friday ORZ064.

&&

$$

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DISCUSSION...SP
AVIATION.....JT
PREV SHORT TERM...BW
PREV LONG TERM....KA