456 
FXUS65 KTFX 201537
AFDTFX

SOUTHWEST AND NORTH CENTRAL MONTANA FORECAST
NATIONAL WEATHER SERVICE GREAT FALLS MT
940 AM MDT SUN JUL 20 2003

.DISCUSSION...

TODAY THROUGH MONDAY...UPDATE TO ZONES PLANNED BY 10...AN UPPER 
LEVEL HIGH PRESSURE RIDGE REMAINS OVER THE ZONES. THE AIRMASS WILL 
BE HOT AND DRY TODAY. THE ONLY UNSTABLE AREAS WILL AGAIN BE THE 
EXTREME EASTERN ZONES...MAINLY TO THE SOUTH. A WEAK SHORTWAVE MOVES 
OVER THE TOP OF RIDGE LATE THIS AFTERNOON AND EVENING. THIS FLATTENS 
RIDGE SLIGHTLY AND COOLING OCCURS UP INTO THE MID-LEVELS. HIGH 
BEGINS TO REBUILD MONDAY BUT TEMPS SHOULD BE MODERATE SLIGHTLY. WILL 
UPDATE TO LOWER A FEW TEMPS TODAY AND MONDAY. ZELZER

TUESDAY NIGHT THROUGH THURSDAY MODELS CONTINUE WITH STRONG RIDGE OF 
HIGH PRESSURE OVER THE GREAT BASIN BECOMING FLAT AND WEAKENING 
SLIGHTLY. A SHORTWAVE TROUGH WILL MOVE THROUGH THIS RIDGE ON 
WEDNESDAY FOR A FEW SHOWERS AND THUNDERSTORMS OVER THE SOUTHWEST. 
DOWNSLOPE WINDS SHOULD KICK IN DURING THE AFTERNOON TO KEEP NORTHERN 
ZONES DRY. THIS PATTERN WILL CONTINUE AGAIN THURSDAY AFTERNOON. DRY 
WESTERLY FLOW WILL BECOME SOUTHWESTERLY WITH LIMITED MOISTURE.

FRIDAY AND SATURDAY...A SOMEWHAT STRONGER SHORTWAVE MOVING EAST AND
SOUTHEAST FROM CANADA ACROSS NORTH AND NORTHCENTRAL MONTANA FOR
SLIGHTLY COOLER TEMPERATURES. SOUTHWEST FLOW RETURNS TO THE AREA FOR
SLIGHT CHANCE OF SHOWERS.

SUNDAY...NORTHWEST FLOW ALOFT RETURNS TO AREA WITH SURFACE HIGH
PRESSURE BUILDING BACK OVER WESTERN MONTANA. TEMPERATURES WILL WARM
UP ONCE AGAIN. CAMP

.CCF NUMBERS
GTF UU 098/058 095/059 103 99000
    UUUBB 057/095 056/087 055/086 056/086 053 00000002200
CTB UU 094/055 092/056 097 99000
    UUUBB 055/089 052/080 054/081 053/081 050 00000001100
HLN UU 099/064 097/065 104 99000
    UUUBB 057/096 058/090 053/088 058/086 053 00000112200
BZN UU 098/052 095/057 103 99000
    UUUBB 053/094 053/090 054/088 054/086 053 00000111100
WEY BU 090/043 087/046 097 99000
    UUBBB 050/087 045/083 052/082 051/078 046 00111111100
DLN BU 095/055 093/058 100 99000
    UUUBB 056/092 053/088 052/086 055/085 050 00---111100
HVR UU 098/059 096/061 101 99000
    UUUBB 057/096 058/090 056/088 058/086 056 000000022--
LWT UU 096/056 094/057 100 99000
    UUUBB 054/092 055/086 055/083 055/083 053 000000022--


.TFX...NONE

$$