000 
FXUS65 KBOI 071021
AFDBOI

SOUTHWEST IDAHO/SOUTHEAST OREGON AREA FORECAST DISCUSSION 
NATIONAL WEATHER SERVICE BOISE IDAHO
320 AM MST WED MAR 07 2001

SPLIT FLOW PATTERN OVER WESTERN NORTH AMERICA WITH CLOSED UPPER HIGH 
CENTER OVER ID AND CLOSED UPPER LOW CENTER SOUTHERN CA/AZ THIS 
MORNING SHIFTS EAST TO AROUND 110W BY TONIGHT IN RESPONSE TO 
PROGRESSIVE UPPER TROUGH AROUND 140W AT 08Z. SURFACE AND UPPER HIGH 
CENTERS OVER ID TODAY KEEPS SUNNY SKIES IN FORECAST. HOWEVER... 
UPPER RIDGE ALSO KEEPS VALLEY INVERSIONS IN PLACE LIMITING WARMING 
TO ONLY COUPLE DEGREES OVER TUE'S LEVEL. STRONGEST INVERSIONS 
SOUTHEAST ORE ZONES WHERE KBNO MAX TEMPS TO REMAIN WELL BELOW 
GUIDANCE LEVELS TODAY. PROGRESSIVE UPPER FLOW PATTERN CONTINUES 
TONIGHT WITH UPPER RIDGE OVER MT/WY ROCKIES AND 140W TROUGH JUST 
OFFSHORE NORTHWEST COAST THU MORNING. 00Z MODELS WERE A LITTLE 
SLOWER WITH APPROACHING TROUGH AND 06Z MESO-ETA CONTINUES THIS 
SLOWER TREND THU WITH INCREASING CLOUDS/CHANCE OF AFTERNOON 
PRECIPITATION SOUTHEAST ORE ZONES SPREADING INTO SOUTHWEST ID ZONES 
THU NIGHT.  

AVN/ETA DIVERGE SOME ON HANDLING THIS TROUGH THU NIGHT/FRI WITH AVN 
SHEARING SYSTEM WITH SOUTHERN PORTION EVENTUALLY BECOMING CLOSED LOW 
OFFSHORE SOUTHERN CA SAT WHILE ETA SLOWER WITH THIS SHEARING AND A 
LITTLE FURTHER WEST OVER WESTERN ORE/NORTHERN CA. 06Z MESO-ETA 
LEANING TOWARD AVN SOLUTION OF TAKING MOST OF THIS TROUGH SOUTH INTO 
CA WHILE NORTHERN PORTION OF SHEARED TROUGH MOVES EAST OR AREA BY 
SAT MORNING. DIRTY/FLAT RIDGING ALONG 130W SAT/SUN KEEPS NORTHERN 
STORM TRACK NORTH AND EAST OF CWFA FOR ONLY BRUSHING AFFECT OF S/WVS 
IN NORTHWESTERLY FLOW. DRY SAT/SUN PORTION OF EXTENDED FORECAST 
3COULD EXTEND INTO MON/TUE AS MAIN ENERGY OF PASSING S/WV COULD 
REMAIN WELL NORTH AND EAST OF CWFA.  PARKER

.BOI...NONE.