Area Forecast Discussion
Issued by NWS Pocatello, ID

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FXUS65 KPIH 182025
AFDPIH

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE POCATELLO ID
225 PM MDT SAT APR 18 2015

.SHORT TERM...TODAY THROUGH TUESDAY.  SURFACE HIGH PRESSURE DROPPING
INTO MONTANA BEHIND AN EXITING COLD FRONT HELPED SHIFT OUR WINDS TO
THE NORTH TODAY. VERY LITTLE MOISTURE ALONG THE WYOMING BORDER TO
SUPPORT SHOWERS...BUT KEPT A SLIGHT CHANCE IN THE FORECAST THIS
EVENING ON THE REMOTE CHANCE SOMETHING COULD DEVELOP ALONG THE
TRAILING END OF THE FRONT. A LITTLE BIGGER SURGE OF MOISTURE RIDES
THE TOP OF THE WEST COAST HIGH PRESSURE RIDGE AND SLIDES THROUGH
ISLAND PARK AND DRIGGS AREA SUNDAY AFTERNOON AND EVENING. ISOLATED
SHOWERS EXPECTED MAINLY OVER THE MOUNTAINS. BY MONDAY...A
DISTURBANCE EJECTS FROM THE LOW PRESSURE CIRCULATION NEAR THE
ALEUTIAN AND TRIES TO NUDGE THE RIDGE NEAR THE COAST INLAND. THE NAM
MODEL TRIES TO MAKE A CASE FOR SOME ISOLATED CONVECTIVE SHOWERS IN
SOUTHEAST IDAHO MONDAY AFTERNOON...BUT IT REALLY LOOKS LIKE SLIM
PICKENS AT THIS TIME. TUESDAY MAY HOLD A LITTLE BETTER CHANCE WITH A
BIT MORE MOISTURE SLIPPING INLAND. RS &&

.LONG TERM...TUESDAY NIGHT THROUGH SATURDAY. MODELS CONTINUE TO SHOW
MOISTURE AND INSTABILITY MOVING IN THE AREA UNDER HIGH PRESSURE
RIDGING STARTING ON WEDNESDAY. EXPECT THE COLD FRONT/TROUGH TO MOVE
THROUGH LATE FRIDAY WITH HIGH PRESSURE RIDGING BUILDING BACK IN
ACROSS THE AREA SATURDAY. LOOK FOR A CHANCE OF MAINLY AFTERNOON
SHOWERS AND THUNDERSTORMS THROUGH WEEK. EXPECT ABOVE AVERAGE
TEMPERATURES THE ENTIRE PERIOD. TEMPERATURE WILL BE THE WARMEST ON
WEDNESDAY AND SLIGHTLY COOL DOWN THROUGH SATURDAY NIGHT BEFORE
GRADUALLY STARTING TO WARM BACK UP SATURDAY AFTERNOON. WYATT

&&

.AVIATION...A WEAK SYSTEM IS MOVING THROUGH THE AREA THIS
AFTERNOON. EXPECT BREEZY WINDS THIS AFTERNOON AND MID-LEVEL CLOUDS.
WYATT

&&

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

&&

$$



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