Area Forecast Discussion
Issued by NWS Pocatello, ID

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FXUS65 KPIH 192035
AFDPIH

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE POCATELLO ID
135 PM MST MON JAN 19 2015

.SHORT TERM...TONIGHT THROUGH WEDNESDAY NIGHT. AREAS OF STRATUS
AND PATCHY FOG REMAIN IN PORTIONS OF THE REGION PER WEB
CAMS AND SAT IMAGERY...PARTICULALY IN THE UPPER SNAKE REGION. WEAK
SHORTWAVE MOVING THROUGH EAST IDAHO WITH ANOTHER DROPPING THROUGH
THE PANHANDLE THIS AFTERNOON. THESE FEATURES MAY BE ENOUGH TO
PRODUCE LIGHT SHOWERS IN MOIST LOW LEVEL AIR MASS. THEREFORE HAVE
KEPT LIGHT POPS OVERNIGHT AND INTO EARLY TUESDAY ACROSS THE
REGION. BELIEVE ACCUMULATIONS WILL REMAIN LIGHT. HAVE EXPANDED
THE AREAS OF FOG EARLY THIS EVENING TO INCLUDE PORTIONS OF THE
SNAKE PLAIN THAT WERE RELATIVELY STRATUS- FREE THIS MORNING...AND
FURTHER INTO THE UPPER SNAKE REGION WHERE FOG WAS MOST PREVALENT.
KEPT PATCHY FREEZING FOG FROM PREVIOUS FORECAST BUT BELIEVE
STRATUS SHOULD BE PREVALENT OVERNIGHT. UPPER RIDGE STRENGTHENS
THROUGH WEDNESDAY NIGHT. LOW LEVEL INVERSIONS SHOULD REMAIN THE
RULE WITH STRATUS/FOG CONTINUING IN LOWER ELEVATION AREAS AND THE
SNAKE PLAIN THROUGH THE REMAINDER OF THE SHORT TERM. TEMP
FORECASTS HIGHLY DEPENDENT ON PLACEMENT OF STRATUS/FOG WITH AREAS
THAT BREAK OUT SEEING A GREATER DIURNAL RANGE /COOLER NIGHTS AND
WARMER DAYS/. HAVE BLENDED THE GUIDANCE IN AREAS ABOVE THE
INVERSION AND KEPT WARMER LOWS/COOLER HIGHS IN LOWER ELEVATIONS.
DMH

.LONG TERM...THURSDAY THROUGH NEXT MONDAY. RIDGE DEVELOPS ALONG THE
WEST COAST THURSDAY/FRIDAY AND GRADUALLY STRENGTHENS AND SHIFTS
INLAND TOWARD THE END OF THE PERIOD. A SERIES OF WEAK SYSTEMS MOVE
OVER THE TOP OF THE RIDGE AND CLIP THE IDAHO/MONTANA BORDER REGION
AND THUS A SLIGHT CHANCE OF SNOWFALL IN THE NE CORNER OF IDAHO FOR
FRIDAY...SATURDAY AND SUNDAY. VALLEY LOCATIONS WILL LIKELY SEE
INVERSIONS DEVELOP WHICH WILL TEND TO HOLD TEMPERATURES BELOW
GUIDANCE VALUES. DSH


&&

.AVIATION...MAIN ISSUE REMAINS LOW STRATUS CLOUDS CREATING LIFR/IFR
CEILINGS AT AIRPORTS IN THE SNAKE PLAIN.  MOST LOCATIONS HAVE LIFTED
AND SCATTERED OUT THIS AFTERNOON...WITH THE EXCEPTION OF IDA.
EXPECT REDEVELOPMENT OF LOW CLOUDS TONIGHT AT IDA AND PIH WITH THE
POTENTIAL TO EXPAND TO BYI.  AT THE PRESENT TIME...EXPECT BYI AND
SUN TO REMAIN MAINLY VFR.  PATCHY FREEZING FOG IS POSSIBLE
TONIGHT... HOWEVER EXPECT LOW CEILINGS TO BE THE MAIN OPERATIONAL
ISSUE.  DSH


&&

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

$$







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