Area Forecast Discussion
Issued by NWS Pocatello, ID

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FXUS65 KPIH 312049
AFDPIH

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE POCATELLO ID
249 PM MDT FRI OCT 31 2014

.SHORT TERM...TODAY THROUGH MONDAY. A STRONG PACIFIC STORM SYSTEM
IS CURRENTLY LOCATED OFF THE PACIFIC COAST. MOISTURE IS STREAMING
INTO OREGON AND WASHINGTON AND NORTHERN CALIFORNIA CURRENTLY WITH
A STRONG JET CORE JUST OFF THE SOUTHERN CALIFORNIA COAST. EXPECT
DRY CONDITIONS THIS AFTERNOON INTO EARLY EVENING WITH LINGERING
HIGH PRESSURE RIDGING. EXPECT SOUTHERLY WINDS THIS AFTERNOON WITH
GUSTS OF 30 TO 35 MPH.

TOMORROW THIS PACIFIC SYSTEM STARTS TO MOVE OVER IDAHO. FRONTAL
PASSAGE WILL OCCUR LATE AFTERNOON INTO EARLY EVENING. LOOK FOR
WINDS TO BECOME EVEN STRONGER BY LATE MORNING WITH GUSTS UP TO 50
TO 55 MPH. A WIND ADVISORY HAS BEEN ISSUED FOR ALL OUR SOUTHERN
ZONES INCLUDING THE EASTERN MAGIC VALLEY AND THE LOWER SNAKE RIVER
PLAIN FROM 10 AM TO 9 PM MDT. THE UPPER SNAKE RIVER PLAIN MAY BE
NEEDED TO BE INCLUDED TO THE WIND ADVISORY..BUT CURRENTLY WINDS WILL
BE GUSTY OF AROUND 35 MPH. STRONG DOWNSLOPE SOUTHERLY WINDS WILL
MAKE DRIVING HAZARDOUS PARTICULARLY ALONG I-84 WHERE BLOWING DUST
COULD SHUT DOWN THE INTERSTATE BRIEFLY. PRECIPITATION WILL START
IN THE AFTERNOON FOR OUR WESTERN BORDERS AND MOVE ACROSS THE AREA.
COLD AIR WILL START MOVING IN FROM THE WEST BY LATE SATURDAY
AFTERNOON DROPPING SNOW LEVELS FROM 8000 FEET TO 5500 FEET BY
SATURDAY EVENING. SNOW LEVELS WILL DROP TO THE VALLEY FLOOR BY
LATE SUNDAY MORNING. LOOK FOR 5 TO 8 INCHES OF SNOW FOR ABOVE 5500
FEET FOR THE CENTRAL MOUNTAINS AND EASTERN HIGHLANDS WHERE A
WINTER STORM WATCH HAS BEEN ISSUED FROM 3 PM MDT SATURDAY UNTIL 5
PM MST SUNDAY. EXPECT 1 TO 3 INCHES OF SNOW ACROSS THE VALLEY
FLOOR. MUCH OF THE SNOW WILL DIMINISH BY SUNDAY AFTERNOON THOUGH
LINGERING SNOW WILL BE POSSIBLE ALONG OUR EASTERN EDGES THROUGH
MONDAY MORNING. WYATT

.LONG TERM...WEAK HIGH PRESSURE RIDGING FOR MONDAY NIGHT WILL BE
FOLLOWED QUICKLY BY ANOTHER UPPER LEVEL TROUGH MOVING THROUGH THE
IDAHO PANHANDLE TUESDAY MORNING. PRECIPITATION EXPECTED INITIALLY
OVER THE CENTRAL MOUNTAINS TUESDAY MORNING WILL WEAKEN AND SPREAD
EAST INTO THE UPPER SNAKE HIGHLANDS TUESDAY AFTERNOON. RELATIVELY
FLAT RIDGING WILL REBOUND SOMEWHAT FOR THE REST OF THE WEEK WITH
MOISTURE AND PRECIPITATION THREAT REMAINING NORTH OF THE FORECAST
AREA THROUGH FRIDAY. DSH

&&

.AVIATION...WIDESPREAD VFR AND LIGHT TO MODERATE WINDS WITH HIGH
PRESSURE RIDGING REMAINING OVER THE REGION THROUGH TONIGHT.
APPROACHING SYSTEM WILL INCREASE WINDS TOMORROW WITH SUSTAINED WIND
SPEEDS OF 25 TO 35 MPH AND GUSTS TO 50 MPH FROM THE SOUTHWEST IN THE
SOUTHERN SNAKE PLAIN.  PRECIPITATION IS EXPECTED BEGINNING MID-DAY
WITH SNOW LEVELS STARTING AT 8000 FEET MSL AND DROPPING TO 4500 FEET
BY SUNDAY MORNING.  DSH


&&

.PIH WATCHES/WARNINGS/ADVISORIES...
WIND ADVISORY FROM 10 AM TO 9 PM MDT SATURDAY IDZ017-021>025.

WINTER STORM WATCH FROM SATURDAY AFTERNOON THROUGH SUNDAY
AFTERNOON ABOVE 5500 FEET FOR THE IDZ019-023-025-031-032.

WINTER STORM WATCH FROM SATURDAY AFTERNOON THROUGH SUNDAY
AFTERNOON IDZ018.

&&

$$







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