Weather

958 
fxus65 kpih 281954 
afdpih 


Area forecast discussion 
National Weather Service Pocatello Idaho 
155 PM MDT Thursday Aug 28 2008 


Discussion...the broad ridge over the Pacific northwest coast today will move 
to the east of the forecast area on Friday. SW flow aloft will dominate 
as a new upper trough digs into the Pacific northwest on Saturday. Warm temperatures 
will continue through Sat...with a slight chance of thunderstorms over the cen mountains 
Sat afternoon/evening as the first of the Pacific moisture moves into that area. 


The upper trough digs itself into a major system by Sunday morning... 
still located over the Pacific northwest. Showers are expected to spread into 
all mountain areas by Sun morning...with a few thunderstorms possible in the 
southern Highlands. A surface low deepens over the Great Basin on Sunday 
..along with strong upward vertical velocity fields ahead of the deepening upper trough. 
This should result in precipitation becoming more widespread by sun 
evening...with the most in the southeast Highlands. The surface low 
stretches out and moves into Wyoming by Monday morning. Precipitation is still 
widespread in the eastern Highlands...with showers wrapping around 
the upper low back into western Idaho. Limited precipitation coverage is expected 
in the Snake River Plain during this event. Showers finally taper 
off late Monday night. 


Temperatures cool drastically from Saturday to Monday...about 20 degrees. 
This may result in snow levels down to around 7500 feet on Monday. Dry 
northwest flow sets up by Tuesday and continues through the end of the week...with 
gradually warming temperatures. Hedges 


&& 


Aviation...expect VFR conditions through Friday as dry westerly 
flow aloft continues to provide uneventful weather over the taf 
sites. 
Gk 




&& 


Fire weather...the flat upper ridge will continue to dominate 
weather through Friday with mainly light diurnal wind variations and 
no precipitation. An upper level trough will approach the West Coast 
Friday and a cold front will slide east into the district. Expect a 
wind increase Saturday with this feature and red flag conditions may 
be a possibility especially in the northern districts with low 
humidities Saturday afternoon. As the upper level trough pushes east 
expect much cooler and wetter conditions Sunday and Monday as 
humidities increase substantially. 




&& 


Pih watches/warnings/advisories... 
none. 
&& 


$$