Area Forecast Discussion
Issued by NWS Pocatello, ID

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FXUS65 KPIH 040855
AFDPIH

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE POCATELLO ID
255 AM MDT FRI SEP 4 2015

.SHORT TERM...TODAY THROUGH SUNDAY. THE UPPER LOW OVER VANCOUVER
ISLAND THIS MORNING WILL CONTINUE TO SLOWLY MOVE SOUTH AND DEEPEN.
THE LOW IS EXPECTED TO BE OVER EASTERN OR BY SAT MORN...THEN OVER
N CEN MT BY SUN MORN. SCATTERED TO NUMEROUS SHOWERS AND A FEW
TSTMS WILL CONTINUE OVER THE NORTH PARTS OF THE FCST AREA THRU SAT
MORN...WHILE THE REST OF THE AREA WILL BE IN THE DRY SLOT WITH
LITTLE PRECIP EXPECTED. STRONG SOUTHERLY FLOW ALOFT AHEAD OF THE
UPPER LOW WILL RESULT IN WINDY CONDITIONS OVER THE SOUTHERN
HIGHLANS THIS AFTN AND EARLY EVE.  AS THE UPPER LOW MOVES INTO ID
ON SAT... PRECIP WILL SPREAD ACROSS MOST AREAS SAT AFTN AND EVE.
AS THE UPPER LOW MOVES INTO MT...PRECIP WILL SHIFT TO THE NORTH
AGAIN SAT NIGHT BEFORE MOVING OUT OF THE FCST AREA BY SUN AFTN.
TEMPS WILL ALSO BE MUCH COOLER SAT AND SUN. SNOW MAY MAKE AN
APPEARANCE SAT IN THE CENTRAL MTNS AT HIGHER ELEVATIONS.

.LONG TERM...MONDAY THROUGH FRIDAY. A MINOR UPPER WAVE MOVES THRU
NORTHERN ID AND MT ON MON. THIS MAY PRODUCE ISOLD SHOWERS ALONG
THE DIVIDE MON AFTN AND NIGHT...BUT THE REST OF THE AREA REMAINS
DRY. BROAD UPPER RIDGING BUILDS OVER THE PAC NW ON WED. THIS WILL
KEEP THE AREA DRY...WITH WARMING TEMPS.

&&

.AVIATION...EXPECT WINDS TO INCREASE THIS AFTERNOON AT BYI...PIH AND
IDA WITH 15 TO 20 KNOT SUSTAINED WINDS AT PIH AND IDA WITH GUSTS OF
25 TO 30 KNOTS.  BYI SHOULD BE AROUND 10 TO 15 KNOT WITH GUSTS TO 20
KNOTS.  BEST CHANCE FOR SHOWERS AND THUNDERSTORMS TODAY WILL BE NEAR
SUN AND HAVE IN VICINITY THERE.  EXPECT SIMILAR SCENARIO SATURDAY
WITH BEST CHANCES IN SUN AREA.   WILL HAVE SIMILAR WIND SCENARIO
SATURDAY AS WELL AT BYI...PIH AND IDA WITH 15 TO 20 KNOT SUSTAINED
WINDS LIKELY AGAIN AT PIH AND IDA.
GK

&&

.FIRE WEATHER...RED FLAG WARNING IN EFFECT FOR ZONES 427 AND 413
FROM 1 TO 10 PM FOR GUSTY WINDS AND LOW HUMIDITY.   EXPECT STRONG
SOUTHERLY WINDS AHEAD OF THE COLD FRONT THERE WITH GUSTS OF 25 TO 35
MPH EXPECTED THIS AFTERNOON AND EARLY EVENING.  MINIMUM HUMIDITY
WILL BE IN THE 15 PERCENT RANGE TODAY.  EXPECT WINDY CONDITIONS IN
THOSE ZONES SATURDAY AS WELL BEHIND THE COLD FRONT BUT HUMIDITY WILL
BE SUBSTANTIALLY HIGHER IN MUCH COLDER CONDITIONS.  EXPECT WETTING
RAINS TODAY AND FRIDAY IN THE NORTHERN ZONES MAINLY 475...476 AND
422 AS THE UPPER LOW PUSHES EAST THROUGH NORTHERN IDAHO.
GK

&&

.PIH WATCHES/WARNINGS/ADVISORIES...
RED FLAG WARNING FROM 1 PM THIS AFTERNOON TO 10 PM MDT THIS
EVENING FOR IDZ413-427.

&&

$$


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