878 
fxus65 kpih 091047 
afdpih 


Area forecast discussion 
National Weather Service Pocatello Idaho 
347 am MST Friday Jan 9 2009 


Short term...today through Sunday. 
Upper trough and associated cold front have moved through southeast 
Idaho but secondary upper trough sliding south currently with 
isolated to scattered snow showers continuing in the southern 
Highlands and upper Snake River Plain as radar showing echoes 
increasing between Howe and Idaho Falls at 330 am. Went ahead and 
put some isolated snow showers and scattered snow showers in Snake 
River Plain and southern and eastern Highlands this morning as 
radar and satellite loops which show cooling cloud tops in eastern 
Idaho indicate some type of lift occurring as flow aloft turns 
northerly. Do not expect much with this and kept amounts under an 
inch. Cut out snow except along Wyoming border after 11 am. 
Saturday and Sunday sees strong northwest flow aloft continuing 
with perhaps some orographic light snows in central mountains and 
eastern Highlands as moisture spills over top of upper ridge in 
Pacific. Expect near seasonal temperatures today into Sunday with 
perhaps some fog and stratus in Snake River Plain overnight 
tonight and Saturday morning as low level moisture remains in 
place. 
Gk 


Long term...Monday through Friday. Unseasonably strong high 
pressure ridge remains along the West Coast with northwest flow 
pattern brining a few showers through southeast Idaho. The ecm and 
GFS focus one embedded disturbance coming over top of the ridge and 
dropping southeast along The Divide Monday and another Tuesday night 
and Wednesday. Expect a few showers Monday in the upper snake 
Highlands and eastern Highlands with limited moisture...perhaps a 
localized inch of snow. The ridge gains amplitude through Thursday 
and successive disturbances coming through the ridge will be 
progressively drier. Thursday night and Friday night the GFS brings 
colder air southward from 60n with some slipping in on the west side 
of The Divide while the ecm keeps the colder air mostly east of The 
Divide. Current forecast trends a little cooler on those 
mornings. Receiver station 




&& 


Aviation...short wave trough over southeast Idaho this morning 
moving south to southeast of state by middle day. Westerly gusty winds 
up to 35 miles per hour this morning are limited mainly south of a kbyi to ku78 
line. These winds diminish through noon time as the trough moves 
southeast. Isolated snow showers also linger mostly over the eastern 
Highlands with local MVFR ceilings vicinity of those showers. Receiver station 




&& 


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


$$