FXUS65 KPIH 291123
AFDPIH
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE POCATELLO ID
423 AM MST SUN NOV 29 2009
.SHORT TERM...SUNDAY THROUGH TUESDAY.
AREA OF FOG AND STRATUS CLOUDS IN THE SNAKE RIVER PLAIN AND
EASTERN MAGIC VALLEY AGAIN THIS MORNING HAS PROMPTED THE ISSUANCE
OF ANOTHER DENSE FOG ADVISORY. AREA OF FOG/STRATUS ALSO EXTENDS
INTO THE RAFT RIVER VALLEY AND PORTIONS OF THE WOOD RIVER VALLEY.
EXPECT A PATTERN SIMILAR TO SATURDAY...WITH GENERAL IMPROVEMENT
THROUGH THE MORNING HOURS. ANTICIPATING ANOTHER ROUND OF VALLEY FOG FOR
LATE SUNDAY NIGHT/MONDAY MORNING AS HIGH PRESSURE DOMINATES THE
WEATHER PATTERN THROUGH TUESDAY AND LITTLE CHANGE IN THE BOUNDARY
LAYER AIRMASS. DSH
.LONG TERM...WEDNESDAY THROUGH SUNDAY.
ONLY MINOR CHANGES MADE TO THE EXTENDED FORECAST THIS MORNING. RIDGE
OF HIGH PRESSURE EXPECTED TO PRODUCE DRY WEATHER FOR WEDNESDAY INTO
THURSDAY. MODELS DIVERGE QUICKLY THEREAFTER WITH ALMOST NO
CONTINUITY RUN TO RUN. MODELS ARE HAVING TROUBLE HANDLING THE
STRENGTH OF THE RIDGE AND HOW FAST TO BREAK DOWN THE RIDGE. ALL
SOLUTIONS POINT TO BREAKING DOWN THE RIDGE...ALTHOUGH PINPOINTING
WHEN IS VERY DIFFICULT TO SAY AT THIS POINT. WILL CONTINUE SLIGHT
CHANCES FOR PRECIPITATION IN THE MOUNTAINS FOR NOW AND GRADUALLY
COOL TEMPS INTO NEXT WEEKEND AS MOST MODELS SHOW THE RIDGE BROKEN
DOWN BY THAT POINT.
&&
.AVIATION...LOW STRATUS AND FOG ACROSS THE SNAKE PLAIN CONTINUES TO
BE PROBLEMATIC. MOST LOCATIONS ARE REPORTING IFR/LIFR CEILINGS WITH
PATCHY FOG REDUCING VISIBILITIES IN SOME AREAS TO 1/4SM. EXPECT MOST
OF THIS MOISTURE TO MIX OUT BY AFTERNOON ONCE AGAIN. AM UNCERTAIN AS
TO WHETHER OR NOT THE UPSLOPE BREEZE WILL ADVECT THE MOISTURE INTO
KSUN ONCE AGAIN TODAY. FOR NOW...WILL GO WITH AN OPTIMISTIC FORECAST
FOR ALL TAF SITES FOR THE AFTERNOON. EXPECT SOME REDEVELOPMENT
TONIGHT WITH MODELS INDICATING MOST LIKELY LOCATION WILL BE IN THE
UPPER HALF OF THE SNAKE PLAIN AFFECTING KIDA.
&&
.PIH WATCHES/WARNINGS/ADVISORIES...
DENSE FOG ADVISORY UNTIL 11 AM MST THIS MORNING FOR IDZ017-
020>022-031.
&&
$$
