Area Forecast Discussion
Issued by NWS Pocatello, ID

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FXUS65 KPIH 300636
AFDPIH

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE POCATELLO ID
1136 PM MST FRI JAN 29 2016

.UPDATE...QUICK UPDATE TO ISSUE A WINTER WEATHER ADVISORY THROUGH
8 AM MST SATURDAY FOR THE EASTERN MAGIC VALLEY AND SNAKE PLAIN
DUE TO THE COMBINATION OF SNOW...WIND AND FALLING TEMPERATURES.
THIS WILL COMBINE TO CREATE HAZARDOUS DRIVING CONDITIONS. IN
ADDITION...WET SNOW MAY COLLECT ON POWER LINES AND TREE
LIMBS...AND MAY RESULT IN FALLING TREE LIMBS AND ISOLATED POWER
OUTAGES. AD/VALLE


&&

.PREV DISCUSSION... /ISSUED 155 PM MST FRI JAN 29 2016/

SHORT TERM...TONIGHT THROUGH MONDAY. EARLY AFTERNOON SATELLITE
IMAGERY SHOWED A STRONG MOIST PACIFIC FLOW PUNCHING EAST THROUGH
OREGON INTO IDAHO. NUMERICAL MODELS CONTINUE TO SHOW WARM-FRONTAL
SNOWFALL AND LOWER VALLEY RAIN PUSHING INTO/THROUGH SE IDAHO THIS
AFTERNOON AND EVENING WITH COLDER TEMPERATURES AND FALLING SNOW
LEVELS AFTER MIDNIGHT. THE HEAVIEST PRECIPITATION SHOULD FALL
BETWEEN NOW AND MIDNIGHT THEN TAPER OFF ACROSS THE CNTRL MOUNTAINS
AND CNTRL SNAKE RIVER PLAIN WHILE MODERATE TO HEAVY SNOWFALL
CONTINUES ACROSS THE SE HIGHLANDS THROUGH ABOUT NOON SATURDAY.
ENERGY ASSOCIATED WITH THE STRONG PACIFIC FLOW TRAILS ACROSS THE
REGION SATURDAY AFTERNOON THROUGH MONDAY (MAINLY MERGING WITH
ANOTHER PAC WAVE RACING EAST THROUGH CALIFORNIA AND THE DESERT SW
MONDAY) SUPPORTING ONGOING SNOW SHOWER ACTIVITY THROUGHOUT THE
PERIOD MAINLY FAVORING THE MOUNTAINS. THUS THE WINTER STORM WARNINGS
CONTINUE FOR THE SURROUNDING MOUNTAINS TONIGHT AND INTO SATURDAY
MORNING. WE MAY YET NEED A SNOW ADVISORY FOR THE UPPER SNAKE RIVER
PLAIN TONIGHT...DEPENDING ON HOW MUCH ACCUMULATION THEY CAN GATHER
LATE THIS AFTERNOON AND EVENING UNDER WARMING CONDITIONS. CURRENTLY
FORECASTING UPWARDS OF 1 TO 3 INCHES IN THAT AREA OVERNIGHT BUT WILL
PUNT TO THE NEXT SHIFT AND ALLOW THEM TO ACCOMMODATE ANY LAST MINUTE
ADJUSTMENTS. BREEZY WINDS ARE ANTICIPATED ACROSS THE AREA SATURDAY
AND REDEVELOPING MONDAY AS THE NEXT SYSTEM PASSES SOUTH OF THE AREA
INTO THE 4-CORNERS REGION. WE WILL SEE OUR WARMEST TEMPERATURES
TODAY THEN COOLING TO BELOW SEASONABLE NORMS BY SUNDAY AND MONDAY
(ALMOST A 20 DEGREE SWING IN HIGHS). HUSTON

LONG TERM...MONDAY NIGHT THROUGH FRIDAY.  LONG TERM PERIOD WILL BE
COLD WITH BELOW NORMAL HIGH TEMPERATURES THROUGH NEXT FRIDAY.  A
WEAK SYSTEM IN NORTHWEST FLOW MAY INCREASE LIGHT SNOW CHANCES LATE
TUESDAY THROUGH WEDNESDAY BUT NO MAJOR SYSTEMS ARE EXPECTED THROUGH
NEXT WEEK WITH ONLY SOME LIGHT SNOW SHOWERS THROUGH THE PERIOD BUT
MAINLY DRY CONDITIONS ARE EXPECTED.  WEDNESDAY LOOKS TO BE BEST
CHANCE FOR THE LIGHT SNOW. GK

AVIATION...LATEST WINTER STORM PUSHING THROUGH REGION.   SUN BELOW
AIRPORT MINIMUMS AND EXPECT IT TO CONTINUE UNTIL AROUND 04Z TONIGHT
WITH LOW VISIBILITIES AND CEILINGS IN SNOW.   EXPECT IMPROVEMENT TO
VFR CONDITIONS BY MIDNIGHT LOCAL.   SHOULD BE MAINLY RAIN AT BYI AND
PIH WITH RAIN AND SNOW MIX AT IDA.  COULD SEE MVFR TO IFR CONDITIONS
AT TIMES AND WENT WITH SNOW AND IFR CONDITIONS AT END OF EVENT WITH
COLD FRONTAL PASSAGE AROUND 09 TO 10 Z FOR A FEW HOURS AT BYI...PIH
AND IDA.  EXPECT WINDS IN THE 20 TO 25 KNOT RANGE OUT OF SOUTH AT
BYI...PIH AND IDA SHIFTING TO WEST TO SOUTHWEST TOWARD MORNING. GK

&&

.PIH WATCHES/WARNINGS/ADVISORIES...
WINTER WEATHER ADVISORY UNTIL 8 AM MST SATURDAY FOR IDZ017-020-
021.

WINTER STORM WARNING UNTIL 2 PM MST SATURDAY FOR IDZ019-022-023-
025.

WINTER STORM WARNING UNTIL 3 AM MST SATURDAY FOR IDZ018-031.

&&

$$


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