359 
FPUS65 KMSO 180859
AFDMSO

WESTERN MONTANA AND NORTH CENTRAL IDAHO FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MISSOULA MT
200 AM MST WED FEB 18 1998

ARCTIC AND POLAR JETS AREA ALIVE AND WELL OVER THE WESTERN PACIFIC
WITH RAPID CYCLOGENESIS WHIRLING AROUND MOTHER LOW OVER NORTH GULF
OF ALASKA. SEQUENCE OF EVENTS REMAIN FOCUSED ON COASTAL LOCATIONS
WITH EASTWARD MOVING WAVES DISSIPATING ENERGY OVER TIME. ETA/AVN
SIMILAR AT INITIALIZATION BUT DIVERGE IN HANDLING NEXT UPSTREAM WAVE
LOCATED AT APPROX 42N 145W FOR TONIGHT. ETA FAVORED WITH REPEAT STORM
TRACK KEEPING TRIPLE POINT GENESIS ALONG THE COAST THUS CONFINING
DYNAMICS AND COLDER AIR WEST OF THE FORECAST AREA. RESPONDING 5H
RIDGE BUILDS OVER PANHANDLE AND WESTERN MONTANA AND SLOWLY PROGRESSES
EASTWARD TONIGHT. A DYING OCCLUSION PASSES AND WAA ADVECTION
INCREASES OVERNIGHT. DEEP MOISTURE LAGGING PROVIDING ONLY GIVING A
RISK OF SNOW FOR NORTHWEST ZONES INTO THURSDAY. THURSDAYS WAVE TAKES
A DIFFERENT TRAJECTORY WITH SITES ON NORTHERN CALIFORNIA AS SPLIT
FLOW ENSUES. MOISTURE WILL FLOW NORTHWARD BUT DYNAMICS REMAINS SOUTH.
WARMER TEMPERATURES ARE EXPECTED AS SOUTHWEST FLOW SETS UP OVER THE
CWA. 

STOLL

LIB .. 040/028 041/... ... 33022
FCA EE 041/026 042/028 042 33022
POL .. 042/029 044/... ... 33012
MSO EE 042/026 044/030 045 33012
HMM .. 047/027 050/... ... 33000
BTM .. 041/011 046/... ... 33000
S80 .. 046/033 048/... ... 33021
P69 .. 048/037 047/... ... 33032
SMN .. 031/012 035/... ... 33000