393 
FPUS65 KMSO 231515
AFDMSO

WESTERN MONTANA AND NORTH CENTRAL IDAHO FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MISSOULA MT
915 AM MDT SUN AUG 23 1998

WATER VAPOR IMAGERY SHOWING UPPER LOW MOVING EAST ALONG THE COLUMBIA
RIVER DRAINAGE WITH JET CUTTING ACROSS SOUTHERN IDAHO INTO SOUTHWEST
MONTANA AT THIS TIME. THUNDERSTORMS THAT DEVELOPED ACROSS NORTHEAST
OREGON AND MOVED ACROSS WESTERN PORTIONS OF IDAHO AND CLEARWATER
COUNTIES HAVE WEAKENED. GOOD AREA OF DIFFLUENCE OCCURRING ON
NORTHEAST SIDE OF THE LOW AND NORTH OF THE JET IN EASTERN WASHINGTON
AND NORTHERN IDAHO PANHANDLE AT THIS TIME. NEW ETA SHOWING POTENT
SHORTWAVE IN SOUTH CENTRAL OREGON AT 12Z...SHOWN WELL ON WATER VAPOR
IMAGERY. THE AREA OF DIFFLUENCE WILL MOVE INTO NORTHWEST MONTANA
TODAY AS WELL AS THE OREGON SHORTWAVE ROTATING ACROSS NORTH CENTRAL
IDAHO INTO THE SOUTHERN HALF OF THE MISSOULA COUNTY WARNING AREA.
DYNAMICS LOOK FAIRLY IMPRESSIVE TODAY SOUTHERN HALF OF THE COUNTY
WARNING AREA...BUT MOISTURE WILL BE ACROSS THE NORTHERN HALF OF THE
MSO COUNTY WARNING AREA...DRY SOUTH. HOWEVER THE MOISTURE WILL DROP
SOUTHEAST THRU THE DAY. INVERTED V SOUNDINGS AND STRONG JET SHEAR 
ALOFT SOUTHERN HALF ANTICIPATING ISOLATED SEVERE
THUNDERSTORMS...MAINLY WINDS..WILL NOT RULE OUT SOME HAIL. FORECAST
HANDLES SYNOPTIC WIND POTENTIAL WELL AND THUNDERSTORMS POTENTIAL.
WILL UPDATE ZONES TO INCLUDE STRONG GUSTY WINDS POSSIBLE NEAR SOME
THUNDERSTORMS FOR THE SOUTHERN HALF TO THE MISSSOULA COUNTY WARNING
AREA. DUE TO THE LACK OF MOISTURE ACROSS SOUTHERN SECTIONS WOULD LIKE
TO CHANGE THUNDERSTORM DEVELOPMENT TO LATE AFTERNOON INSTEAD OF JUST
AFTERNOON. 
 
...FORECASTS BELOW ARE PRELIMINARY AND SUBJECT TO CHANGE...

LIB .. 079/049 075/... ... 29342
FCA EE 078/049 074/044 076 29342
POL .. 080/055 079/... ... 29342
MSO EB 079/051 076/047 078 29342
HMM .. 081/052 078/... ... 29342
BTM .. 077/046 073/... ... 29342
S80 .. 076/050 078/... ... 29331
P69 .. 081/054 083/... ... 29331
SMN .. 081/048 081/... ... 29321