Area Forecast Discussion
Issued by NWS Pocatello, ID

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FXUS65 KPIH 250400
AFDPIH

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE POCATELLO ID
900 PM MST SAT JAN 24 2015

.UPDATE...

UPDATING THE OVERNIGHT FORECAST TO INCLUDE PATCHY FOG AND LOW
STRATUS IN THE SNAKE RIVER PLAIN AND EASTERN MAGIC VALLEY. BEST
CHANCES FOR WIDESPREAD FOG ARE AROUND IDAHO FALLS AND REXBURG
WHERE VISIBILITIES HAVE BEEN LOWER THROUGH MUCH OF THE EVENING.
HOWEVER THERE IS SOME ADDITIONAL CLOUDS AROUND 5000FT THAT ARE AND
WILL CONTINUE TO PASS THROUGH THIS AREA OVERNIGHT. THEREFORE THINK
THE FOG WILL REMAIN PATCHY AND NOT WIDESPREAD ENOUGH TO WARRANT AN
ADVISORY.

VALLE

&&

.PREV DISCUSSION... /ISSUED 107 PM MST SAT JAN 24 2015/

SHORT TERM...TONIGHT THROUGH TUESDAY. THE UPPER HIGH OFF THE
NORTHERN CA COAST WILL MOVE EASTWARD TO THE GREAT BASIN BY MONDAY.
NW FLOW WILL RESULT IN CONTINUED LIGHT ALONG THE DIVIDE AND THE WY
BORDER TONIGHT...BUT WILL DIMINISH AS THE NW FLOW IS PUSHED OFF
TO THE EAST WITH THE APPROACH OF THE UPPER HIGH. DRY AND MILD
CONDITIONS WILL BE THE RESULT THRU MON NIGHT. THE UPPER HIGH MOVES
OFF TO THE EAST BY TUE MORN AS A WEAK UPPER LOW MOVES TOWARD THE
GREAT BASIN FROM THE SW. THIS WILL SPREAD PRECIP NORTHWARD FROM UT
INTO THE SOUTHERN HIGHLANDS ON TUE. THIS WILL BE A WARM SYSTEM...
WITH RELATIVELY HIGH SNOW LEVELS. HEDGES

LONG TERM...TUE NIGHT THROUGH NEXT SAT NIGHT. MAIN FEATURE FOR THE
WEEK OCCURS IN THE FIRST PERIOD WITH A WARM LOW APPROACHING FROM THE
SOUTH. THUS HEAVIER SNOW AND RAIN SHOULD BE IN THE SOUTHERN HALF OF
THE FORECAST AREA. FAIRLY HIGH SNOW LEVEL EXPECTED. ON WED...THE
TROUGH TAKES A TURN TO THE EAST AS IT MEETS UP WITH THE JET STREAM
DIGGING SOUTHWARD. THIS ALLOWS A FAIRLY QUICK CLEARING...ALTHOUGH
SOME UNCERTAINTY HERE WITH THE ECMWF CONTINUING MORE PRECIPITATION
IN EASTERN IDAHO THAN THE GFS. THE TREND HAS BEEN DRYING FOR THE
PERIODS FROM WED NIGHT TO FRI. NEXT TROUGH POSSIBLE FRI NIGHT WITH
THE ECMWF NOW DRIER THAN THE GFS. HIGH PRESSURE CONTINUES ALL THIS
TIME OFF THE PACIFIC COAST. IN SPITE OF THE NORTHERLY
FLOW...GUIDANCE INDICATES TEMPERATURES COOLING...ALTHOUGH STAYING
WARMER THAN SEASONAL NORMALS. MESSICK

AVIATION...HIGHER CLOUDINESS BLOCKING VIEWS OF THE STRATUS LAYER
BELOW...SO UNSURE OF ANYTHING EXCEPT THE WIDE SWINGS OBSERVED BY THE
ASOS AT EACH AIRDROME. DO NOT EXPECT MUCH IN THE WAY OF CLEARING
EXCEPT AT KBYI WHERE THE BOUNDARY LAYER CONTINUES TO SHOW A DRY
TONGUE PUSHING INTO THE SOUTHERN MAGIC VALLEY DURING THE OVERNIGHT
HOURS. WIND CONTINUING LIGHT AND VARIABLE. BELIEVE THE TROUGH
PASSAGE WILL KEEP WIND ABOVE THE BOUNDARY LAYER AT KSUN NORTH AND
NORTHWEST SO DO NOT EXPECT FOG OR STRATUS HERE LIKE LAST NIGHT.
MESSICK

&&

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

$$







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