Area Forecast Discussion
Issued by NWS Pocatello, ID

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FXUS65 KPIH 182019
AFDPIH

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE POCATELLO ID
219 PM MDT SAT OCT 18 2014

.SHORT TERM...HIGH PRESSURE RIDGE WILL AMPLIFY AND MOVE ACROSS
SOUTHEAST IDAHO TO WYOMING BY SUNDAY NIGHT. NORTHEASTERLY SURFACE
PRESSURE GRADIENT WILL PERSIST FOR SUNDAY AND MONDAY MORNING WHICH
SUPPORTS A SHARP SURFACE INVERSION OVERNIGHT. THEREFORE WILL
CONTINUE TO FORCE MORNING LOWS COLDER AGAINST MUCH OF THE MODEL
GUIDANCE FOR BOTH MORNINGS. LOW PRESSURE TROUGH WILL MOVE INLAND BY MONDAY
NIGHT AND BRING RAIN SHOWERS TO THE CENTRAL MOUNTAINS BEFORE
TUESDAY MORNING. MODELS ARE ALSO CONSISTENT IN BRINGING SUB
TROPICAL MOISTURE NORTH FROM ARIZONA AND NEW MEXICO IN ALMOST
MONSOON FASHION. THIS TRICKLES INTO THE EASTERN HIGHLANDS BY
TUESDAY MORNING AND WILL SUPPORT SOME CONVECTIVE SHOWERS IN THAT
AREA THROUGH THE DAY. COULD BE ENOUGH INSTABILITY FOR ISOLATED
THUNDERSTORMS IN THE CENTRAL MOUNTAINS TUESDAY. THIS TROUGH MOVES
OFF TO THE EAST QUICKLY TUESDAY NIGHT. MEANWHILE...THE TROUGH OFF
SHORE BEGINS TO DIG SOUTHWARD WHICH IN TURN CAUSES A HIGH PRESSURE
RIDGE TO AMPLIFY OVER THE GREAT BASIN AND ROCKY MOUNTAINS BY MID
WEEK. RS

.LONG TERM...WEDNESDAY THROUGH SATURDAY.
MODELS IN GENERAL AGREEMENT IN UPPER RIDGE BUILDING TO EAST WITH DRY
SOUTHWESTERLY FLOW ALOFT SETTING UP THROUGH THE EXTENDED PORTION OF
THE FORECAST.   EXPECT DRY CONDITIONS THROUGH THE PERIOD WITH WELL
ABOVE NORMAL TEMPERATURES INTO NEXT WEEKEND.
GK

&&

.AVIATION...VFR CONDITIONS WILL CONTINUE THROUGH SUNDAY WITH MAINLY
LIGHT WINDS EXPECTED.
GK

&&

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

&&

$$






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