Area Forecast Discussion
Issued by NWS Pocatello, ID

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39
000
FXUS65 KPIH 072012 CCA
AFDPIH

AREA FORECAST DISCUSSION...CORRECTED
NATIONAL WEATHER SERVICE POCATELLO ID
112 PM MST SUN FEB 7 2016

.SHORT TERM...TONIGHT THROUGH WEDNESDAY. AN AREA OF FOG AND
STRATUS REFUSES TO BUDGE ACROSS THE UPPER SNAKE PLAIN AND
HIGHLANDS THIS AFTERNOON. RIGHT NOW...IT IS UNLIKELY THAT IT WILL
FULLY DISSIPATE BUT THERE COULD BE SOME SLIGHT IMPROVEMENT BEFORE
SUNSET. THERE ARE A FEW OTHER POCKETS OF LOW CLOUDS BUT THOSE SEEM
TO BE THINNING OUT QUICKER. THIS UNUSUALLY STRONG AREA OF HIGH
PRESSURE CONTINUES BUILDING ACROSS THE WEST. THAT WILL SERVE TO
STRENGTHEN VALLEY INVERSIONS THROUGH MIDWEEK. EXPECT MORE STRATUS
AND/OR FREEZING FOG FOR MANY VALLEY LOCATIONS. WHILE WE COULD SEE
SOME IMPROVING CONDITIONS EACH AFTERNOON ALONG THE EDGES OF ANY
STRATUS FILLED VALLEY OR PLAIN...IT WOULD BE VERY SHORT LIVED AND
FILL BACK IN AFTER DARK. WHERE THE INVERSIONS HOLD...HIGHS WILL
ONLY BE IN THE 20S TO MID 30S. IN THE MOUNTAINS...AND ANYWHERE
THAT THE INVERSION BREAKS...TEMPERATURES WILL SHOOT INTO THE 40S.
IT STILL LOOKS LIKE SOME MOUNTAIN WILL PUSH PAST 50 DEGREES
TUESDAY AND WEDNESDAY. WE ARE STILL CONCERNED ABOUT RAPID SNOWMELT
AND IMPACTS RELATED TO THAT INCLUDING POSSIBLE MINOR FLOODING. AT
NIGHT...MOST AREAS WILL DROP BELOW FREEZING. HOWEVER...IT IS VERY
POSSIBLE THAT SOME MID/UPPER SLOPES ACROSS THE CENTRAL MOUNTAINS
AND SOUTH CENTRAL HIGHLANDS MAY NOT AND DROP TO ONLY AROUND 34-35
DEGREES. KEYES

.LONG TERM...THURSDAY THROUGH SUNDAY NIGHT. THE UPPER RIDGE OVER THE
WEST IS EXPECTED TO REMAIN DOMINANT THRU FRI. INVERSION CONDITIONS
WILL RESULT IN NIGHTTIME LOW CLOUDS AND PATCHY FOG IN VALLEYS. TEMPS
WILL BE CONSIDERABLY WARMER AT HIGHER ELEVATIONS.  BOTH GFS AND
ECMWF BRING AN UPPER TROF INTO THE PACIFIC NORTHWEST ON
SATURDAY...BUT THE GFS MOVES IT THRU IDAHO MUCH QUICKER. ONLY
LOOKING FOR LIGHT MOUNTAIN SNOW BOTH SATURDAY AND SUNDAY. CONFIDENCE
REMAINS LOW AT THIS POINT ON ACTUAL TIMING AND STRENGTH OF THIS
SYSTEM.  CURRENT TREND THEN IS TO DEVELOP A RIDGE BACK OVER THE
WESTERN STATES WITH BOTH GFS AND EC MODELS TRENDING SIMILAR WITH
LITTLE TO NO PRECIPITATION EXPECTED THROUGH MID WEEK.

PRESTON/HEDGES

&&

.AVIATION...MVFR/IFR CIGS/FOG IN THE UPPER SNAKE RIVER PLAIN LINGER
THIS AFTERNOON AND EXPECT THAT TREND TO CONTINUE THROUGH TOMORROW...
ESPECIALLY WITH KIDA.  POSSIBLE CLOUD DECK TO REDEVELOP OVER KPIH
OVERNIGHT SO HAVE ADDED THIS INFO INTO THE TAF. PRESTON

&&

.AIR STAGNATION...WITH THE STRENGTH OF THE RIDGE IN PLACE NEXT
WEEK...WE ARE EXPECTING THAT AIR QUALITY WILL WORSEN ESPECIALLY IN
VALLEYS WHERE LITTLE TO NO MIXING OCCURS. WHILE WEATHER CONDITIONS
MAY MODERATE LATE IN THE WEEK...IT REMAINS TO BE SEEN IF AIR
QUALITY RAPIDLY IMPROVES. THE PATTERN LATE IN THE WEEK MAY NOT BE
ENOUGH TO COMPLETELY SCOUR OUT THE DIRTY AIR. KEYES


&&

.PIH WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

$$


USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.