Issued by NWS Boise, ID
000 FXUS65 KBOI 222202 AFDBOI AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BOISE ID 302 PM MST SUN NOV 22 2009 .SHORT TERM...TONIGHT THROUGH TUESDAY...SNOW SHOWERS IN CENTRAL IDAHO ASSOCIATED WITH AN EXITING UPPER LEVEL TROUGH WILL ALLOW UP TO AN ADDITIONAL 2 INCHES ACCUMULATION IN EASTERN VALLEY COUNTY AND THE BOISE MOUNTAINS AND UP TO AN INCH OF WET SNOW GRASSY/BARE AREAS IN THE WESTERN MAGIC VALLEY...UNTIL AROUND 6 PM. LOCALLY GUSTY WEST WINDS TO 35 MPH LOOK TO DIMINISH TO LIGHT EARLY THIS EVENING EXCEPT IN THE MAGIC VALLEY WHERE 15-20 MPH SUSTAINED WIND ARE EXPECTED TONIGHT. SO PATCHY FOG IS POSSIBLE WHERE WINDS DROP OFF. QUICK MOVING STORM WILL LEAVE COOL NW FLOW AND DRYING ACROSS THE REGION THROUGH MONDAY NOON RESULTING TEMPERATURES 3-5F BELOW NORMAL THOUGH HIGH ELEVATION SHELTERED AREAS /I.E. FAFI1/ COULD SEE SINGLE DIGIT LOWS THE NEXT COUPLE NIGHTS. A SYSTEM THAT BRUSHES PRECIP NORTH OF US IS EXPECTED TO BRING SOME CLOUDS ACROSS SE OREGON AND SW IDAHO MONDAY AFTERNOON AND FAR NORTHERN ZONES TUESDAY AS A RIDGE/INVERSION BUILDS NORTHWARD INTO THE AREA. COULD SEE STRATUS EARLY TUESDAY MORNING IN THE UPPER WEISER ZONE WHERE SNOW ACCUMULATED AND INTO THE OREGON LOWER TREASURE VALLEY WHERE DIURNAL WINDS TEND TO ACCUMULATE SUCH LOW LEVEL MOISTURE. .LONG TERM...TUESDAY NIGHT THROUGH SUNDAY...SHORTWAVE RIDGE WILL KEEP INVERSION IN PLACE THROUGH THURSDAY. RESULT WILL BE ABOVE NORMAL TEMPS IN THE MOUNTAINS WITH COLDER AIR TRAPPED IN THE VALLEYS. MODELS HAVE HINT OF A SE WIND IN BOISE WHICH COULD BE ENOUGH TO KEEP FOG/STRATUS OUT OF THE CITY. LOOKS LIKE A BETTER CHANCE IN LOWER TREASURE/WEISER AND BAKER VALLEYS FOR WEDNESDAY AND THURSDAY MORNING WITH LITTLE WIND. WHILE INVERSION REMAINS IN PLACE ON THURSDAY... SURFACE WINDS WILL INCREASE DURING THE DAY HELPING TO SCOUR OUT THE FOG/STRATUS IN MOST LOCATIONS. SHORTWAVE MOVES INTO THE REGION ON FRIDAY BRINGING CHANCE OF SNOW TO THE MTNS AND RAIN TO THE VALLEYS. CONDITIONS DRY OUT FOR SAT/SUN IN N-NW FLOW WITH NEAR NORMAL TEMPS. && .AVIATION...LOCAL IFR IN THE SW IDAHO MTNS AND MVFR IN THE WESTERN MAGIC VALLEY THIS AFTERNOON WILL GRADUALLY IMPROVE THIS EVENING. ISOLATED IFR IN THE MTNS OVERNIGHT DUE TO LOW CEILINGS...OTHERWISE VFR TONIGHT AND MONDAY. SURFACE WINDS GENERALLY DECREASING TO 10 KTS OR LESS FOR MONDAY. WINDS ALOFT DECREASE TO 20 KTS OR LESS BELOW 10K FEET MSL. && .BOI WATCHES/WARNINGS/ADVISORIES... ID...NONE. OR...NONE. && $$ WEATHER.GOV/BOISE SHORT TERM...VM LONG TERM....DG/DD AVIATION.....DG
