Area Forecast Discussion
Issued by NWS Pocatello, ID

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FXUS65 KPIH 202007
AFDPIH

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE POCATELLO ID
207 PM MDT SUN APR 20 2014

.SHORT TERM...SOUTHEAST IDAHO WILL BE UNDER A TRANSITORY SHORT WAVE RIDGE TONIGHT
THROUGH MONDAY EARLY EVENING WITH NO PRECIPITATION EXPECTED. MONDAY
ENDS UP BEING A WARMER DAY WITH VALLEY HIGHS 65 TO 70 DEGREES AND
LITTLE WIND. MONDAY NIGHT...CLOUDS INCREASE ACROSS THE FORECAST AREA
AS THE PACIFIC TROUGH APPROACHES. SNOW LEVELS WILL BE ELEVATED TO
8500 FEET ELEVATION OR HIGHER WITH THE POSSIBILITY OF SOME LIGHT
RAIN ON THE UPPER SLOPES AS A LEADING DISTURBANCE IN SOUTHWEST FLOW
AHEAD OF THE TROUGH RIPPLES THROUGH ROUGHLY FROM PICABO TO ISLAND
PARK. THE MAIN PRECIPITATION OVER SPREADS THE AREA TUESDAY. VERY
DIFFICULT TO FIND ENOUGH INSTABILITY FOR THUNDERSTORMS. SNOW LEVELS
DROP TO ABOUT 7500 FEET BY TUESDAY AFTERNOON AND EVENTUALLY
4500-5000FT BY WEDNESDAY MORNING. ESTIMATE A HALF INCH OF LIQUID
PRECIPITATION IS POSSIBLE BETWEEN TUESDAY MORNING AND WEDNESDAY
MORNING ON THE WEST SIDE OF CUSTER COUNTY. WEB CAMS SUGGEST A GOOD
DEAL OF SNOW HAS ALREADY COME OFF IN THAT AREA SO NOT REAL CONFIDENT
IN THIS BECOMING A FLOOD THREAT. FOR THE EASTERN HIGHLANDS...THE
SNOW PACK AROUND ISLAND PARK...DRIGGS...AND AREAS ABOVE THE HENRYS
FORK AND TETON RIVER THE SNOW PACK IS MUCH MORE FAVORABLE.
HOWEVER...24 HOUR PRECIPITATION ESTIMATES ARE ONLY AROUND .20 TO
.25 INCH FOR THE MOUNTAINS. ANY FLOODING MAY BE LIMITED TO SMALL
STREAMS AT BEST AND GENERALLY ISOLATED EVENTS. TUESDAY AFTERNOON
WILL BE NEAR WIND ADVISORY AGAIN WITH SOUTHWEST WINDS 25 TO 30 MPH
AND GUSTY. EXPECTING HIGHS WEDNESDAY NEAR 50 IN THE VALLEYS. RS

.LONG TERM...WEDNESDAY NIGHT THROUGH SUNDAY NIGHT.

EXTENDED FORECAST LOOKS FAIRLY WET. A LOW PRESSURE SYSTEM OVER
MONTANA WILL KEEP SOME RESIDUAL PRECIPITATION OVER THE AREA
WEDNESDAY NIGHT. MEANWHILE ANOTHER LOW PRESSURE SYSTEM WILL MOVE
INTO THE PACIFIC NORTHWEST. THIS SYSTEM WILL BRING WAVES OF MOISTURE
INTO THE AREA BEGINNING THURSDAY AND PERSISTING THROUGH THE WEEKEND.
FRIDAY AND SATURDAY ARE THE WETTEST DAYS AT THIS POINT WHEN A STRONG
SHORTWAVE TROUGH WILL MOVE THROUGH THE REGION. TEMPERATURES WILL BE
SLIGHTLY ABOVE NORMAL FOR THURSDAY AND FRIDAY BEFORE DIPPING
SLIGHTLY BELOW NORMAL FOR THE WEEKEND.

VALLE

&&

.AVIATION...WINDS WILL CONTINUE TO DIMINISH THIS AFTERNOON AND
QUICKLY THIS EVENING. HIGH CIRRUS WILL DRIFT THROUGH THE REGION.

VALLE

&&

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

&&

$$







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