Weather

473 
fxus65 kpih 111950 
afdpih 


Area forecast discussion 
National Weather Service Pocatello Idaho 
150 PM MDT Sat Oct 11 2008 


Short term...strong upper low in western Utah slide northeast 
overnight placing southeast Idaho in excellent position to pick up 
heavy snowfall as forecast. Will keep current warnings in place 
through tomorrow at least noon-time. There is a possibility of 
convection embedded with snow area overnight...so would not rule 
out an isolated lightning Bolt...although did not place in 
forecast. Most preferred area for this is along Idaho / Wyoming 
border...and if it occurs...a brief 2-3 inch per hour snowfall 
possible. Otherwise...snowfall to continue as low wraps moisture 
around itself as it pulls northeast. Moisture from Hurricane 
Norbert will only graze the area as most will pushed off to east. 
Strong winds expected to keep in place until midnight...so have 
kept blowing and drifting mentioned in warnings. 


Long...term...once the upper low pushes east Monday...progressive 
drier pattern sets up for middle week. Flow flattens with weak energy 
riding east through Panhandle and just north of Divide. Left weak 
probability of precipitation along northern tier zones Tuesday and Tuesday night. Upper 
ridge builds into region late in the week ahead of next Pacific 
low. Eastern Idaho looks dry and mild for Thursday/Friday. Could 
see next system arrive by next weekend for another shot at rain 
for eastern Idaho. Dmh 


&& 




Once the upper low pushes east Monday...progressive drier pattern 
sets up for middle week. Flow flattens with weak energy riding east 
through Panhandle and just north of Divide. Left weak probability of precipitation along 
northern tier zones Tuesday and Tuesday night. Upper ridge builds 
into region late in the week ahead of next Pacific low. Eastern 
Idaho looks dry and mild for Thursday/Friday. Could see next 
system arrive by next weekend for another shot at rain for eastern 
Idaho. Dmh 


&& 


Aviation...widespread snow tonight for most of the forecast area 
with MVFR/IFR conditions predominating. Periods of LIFR in the 
Snake River Plain and eastern/southern Highlands in heavier snow 
showers. Dsh 


&& 


Fire weather...a major winter storm will produce widespread snow 
for the remainder of the weekend. Several inches of snow are 
possible in both mountain and valley locations. The winter storm 
will move to the east Sunday night with snow ending over most areas. 
Dsh 


&& 


Pih watches/warnings/advisories... 
Winter Storm Warning until 3 PM MDT Sunday for idz017-020-021. 


Winter Storm Warning until 12 PM MDT Sunday for idz018-019- 
022>025-032. 


&& 


$$