Area Forecast Discussion
Issued by NWS Pocatello, ID

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FXUS65 KPIH 220248
AFDPIH

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE POCATELLO ID
848 PM MDT FRI AUG 21 2015

.UPDATE...POST FRONTAL WINDS CONTINUE TO GUST ACROSS MOST OF
CENTRAL AND EASTERN IDAHO THIS EVENING AND EXPECT THEM TO LINGER
THROUGH 11 PM. LATER TONIGHT AS THE STORM SYSTEM MOVES EAST
THROUGH MONTANA THE WINDS SHOULD DIE DOWN BY EARLY TOMORROW
MORNING. A FEW SHOWERS HAVE PASSED BY THE ISLAND PARK REGION AND
EXPECT THEM TO END BY 10 PM.

WITH THE CLEARING SKIES AND DIMINISHING WINDS WE ARE EXPECTING
COOL TEMPERATURES TOMORROW MORNING. IN FACT, SEVERAL MID AND
HIGHER MOUNTAIN VALLEYS WILL SEE MORNING LOWS AT OR BELOW
FREEZING. SATURDAY MILD AND COOL WITH WARMING TREND SUNDAY INTO
NEXT WEEK.

THE RED FLAG WARNING WILL EXPIRE AT 9PM AS WELL AS THE LAKE WIND
ADVISORY FOR AMERICAN FALLS RESERVOIR.

PRESTON



&&

.PREV DISCUSSION... /ISSUED 203 PM MDT FRI AUG 21 2015/

DISCUSSION...AN UPPER LOW OVE SOUTHERN BC WITH AN ASSOCIATED TROF
INTO EASTERN WA/OR WILL MOVE INTO EASTERN MT/WY BY SAT MORNING.
WINDS ARE PICKING UP AS THE STRONGER UPPER FLOW MIXES DOWN TO THE
SFC. WINDS WILL DIMINISH LATER THIS EVE. A COLD FRONT PASSING THRU
ID THIS AFTN WILL SET OFF ISOLD TSTMS...MAINLY N OF THE DIVIDE.
COOLER TEMPS ON SAT...BUT WARMING BACK UP ON SUN AS THE UPPER
RIDGE BUILDS BACK UP OVER THE WEST. THE RIDGE STAYS DOMINANT THRU
THE END OF THE WEEK. SOME SUBTROPICAL MOISTURE BEGINS TO FLOW UP
THE W SIDE OF THE RIDGE ON TUE. THIS WILL SUPPORT ISOLD MTN TSTMS
LATE TUE AFTN AND EVE. TSTMS BECOME A LITTLE MORE NUMEROUS WED AND
THU...DECREASING ON FRI AS THE RIDGE FLATTENS INTO MORE WESTERLY
FLOW. HEDGES

AVIATION...WINDS HAVE ALREADY BECOME BREEZY OUT AHEAD OF A FRONTAL
BOUNDARY MOVING THROUGH THIS AFTERNOON INTO EARLY EVENING. WINDS
WILL BECOME MODERATELY GUSTY WITH GUSTS AROUND 25 TO 35 MPH ACROSS
THE SNAKE RIVER PLAIN AS WELL AS THE EASTERN MAGIC VALLEY AND TO AN
SLIGHTLY LESSER EXTENT FOR KSUN. SMOKE CONTINUES TO MILDLY AFFECT
ALL TAF SITES BUT SHOULD STILL REMAIN VFR. NO PRECIPITATION IS
EXPECTED WITH THIS BOUNDARY. EXPECT VFR CONDITIONS ALONG WITH
OVERALL LIGHT WINDS FOR ALL TAF SITES SATURDAY THROUGH TUESDAY.
CHANCE OF AFTERNOON THUNDERSTORMS RETURNS BY NEXT WEDNESDAY AND
CONTINUES THROUGH THE END OF THE WEEK. WYATT

FIRE WEATHER...A STRONG...MOSTLY DRY COLD FRONT IS CURRENTLY MOVING
THROUGH THE AREA. RED FLAG WARNINGS REMAIN IN EFFECT FOR ZONES
475...476 AND 410 AS WELL AS ZONE 413 BELOW 5000 FEET. EXPECT WIND
GUSTS IN THE 25 TO 40 MPH RANGE THIS AFTERNOON AND EARLY EVENING
WITH MINIMUM HUMIDITY SLIGHTLY BELOW OR NEAR 15 PERCENT ACROSS THE
WARNED AREAS.  MAIN CONCERN IS FOR POTENTIAL OF SPREAD OF LARGE
FIRES IN ZONE 475. THE WINDS ARE NOW SHIFTING BECOMING NORTHWESTERLY
FOR THE CENTRAL MOUNTAINS. IN THE SNAKE RIVER PLAIN WINDS ARE
CURRENTLY GUSTING UP TO 40 MPH ACROSS THE UPPER SNAKE RIVER PLAIN.
ISOLATED THUNDERSTORMS ALONG THE MONTANA DIVIDE ARE POSSIBLE LATER
THIS AFTERNOON. TOMORROW LOOK FOR HIGH PRESSURE RIDGING TO RETURN
BRINGING DRIER AND WARMER CONDITIONS THROUGH THE WEEKEND INTO EARLY
NEXT WEEK. MODELS CONTINUE TO INDICATE MONSOON MOISTURE WILL RETURN
BUT ARE STILL UNCERTAIN ON THE TIMING. THE GENERAL CONSENSUS IS
SHOWING WEDNESDAY AFTERNOON. WYATT

&&

.PIH WATCHES/WARNINGS/ADVISORIES...

&&

$$



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