323
FXUS65 KPIH 081919
AFDPIH
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE POCATELLO ID
119 PM MDT SAT AUG 8 2026
KEY MESSAGES
- WILDFIRE SMOKE WILL CONTINUE TO IMPACT THE AREA ON AND OFF FOR
THE NEXT FEW DAYS. EXPECT DECREASED AIR QUALITY AT TIMES WITH
AN AIR QUALITY ADVISORY REMAINING IN EFFECT FOR CUSTER COUNTY.
- HEAT ADVISORY CONTINUES FOR THE EASTERN MAGIC VALLEY, SOUTH
HILLS, AND SNAKE RIVER PLAIN FOR THE WEEKEND AS HIGHS REMAIN
IN THE MID TO UPPER 90S.
- VERY SMALL CHANCE FOR AN ISOLATED SHOWER OR STORM THIS
AFTERNOON, MAINLY IN THE SOUTH HILLS.
DISCUSSION
ISSUED AT 209 AM MDT SAT AUG 8 2026
THE HEAT IS THE MAIN WEATHER IMPACT THIS WEEKEND WITH A HEAT
ADVISORY CONTINUING FOR THE EASTERN MAGIC VALLEY, SOUTH HILLS, AND
SNAKE RIVER PLAIN. IT'S WITHIN THESE AREAS THAT HIGHS TODAY WILL
PUSH TOWARDS 100 DEGREES AGAIN AND ONLY DROP INTO THE LOW TO MID 60S
OVERNIGHT INTO SUNDAY. SOME WILDFIRE SMOKE LINGERS ACROSS THE AREA
TODAY, BUT THE MAIN IMPACTS FROM THAT ARE EXPECTED TO BE A BIT MORE
CONFINED TO CUSTER COUNTY WHERE AN AIR QUALITY ALERT REMAINS IN
EFFECT THROUGH MONDAY AFTERNOON. IN ADDITION TO THE HEAT AND SMOKE,
A RED FLAG WARNING IS ALSO IN EFFECT FOR THE CENTRAL MOUNTAINS THIS
AFTERNOON. THIS IS DUE TO GUSTY AFTERNOON WINDS AROUND 25 MPH AND
MINIMUM RELATIVE HUMIDITY FALLING TO 10 TO 15 PERCENT. OUTSIDE OF
THIS AREA, WIND GUSTS WILL RANGE FROM 20 TO 30 MPH WITH THE
STRONGEST GUSTS OUT ACROSS PARTS OF THE ARCO DESERT. THERE IS A VERY
SMALL CHANCE (10 TO 15 PERCENT) FOR AN ISOLATED SHOWER OR STORM IN
PARTS OF THE SOUTH HILLS AND UP NORTH ALONG THE IDAHO/MONTANA DIVIDE
AS A BIT OF MOISTURE DOES ITS BEST TO WORK UP AND AROUND THE HIGH
PRESSURE OVER OUR AREA. EXPECT SUNDAY TO BE A NEARLY IDENTICAL
WEATHER DAY. THE RIDGE OF HIGH PRESSURE GETS FLATTENED A BIT EARLY
NEXT WEEK AS AN AREA OF LOW PRESSURE MOVES INTO BRITISH COLUMBIA AND
TROUGHING EXTENDS SOUTHWARD INTO THE PACIFIC NORTHWEST. WHERE THAT
LOW WILL TRACK THROUGHOUT THE REST OF THE WEEK IS NOT EXACTLY
RESOLVED YET BY THE LONGER RANGE MODELS, BUT AFTERNOON HIGHS WILL
SLOWLY DECREASE DURING THE WEEK, FALLING TO THE LOW TO MID 80S BY
NEXT FRIDAY. ISOLATED SHOWER AND STORM CHANCES WILL BE AROUND
THROUGH NEXT WEEK, BUT IT MAY NOT BE UNTIL THE END OF THE WEEK/NEXT
WEEKEND THAT WE FINALLY SEE SOME POTENTIAL FOR MORE WIDESPREAD
PRECIPITATION.
AVIATION /18Z TAFS THROUGH 18Z SUNDAY/
ISSUED AT 1121 AM MDT SAT AUG 8 2026
MAIN IMPACT WILL BE ANY POTENTIAL SMOKE VISIBILITY RESTRICTIONS.
AT THIS TIME DID NOT LOWER BELOW 6 MILES AND HAVE THAT AT IDA,
SUN AND BYI, BUT PIH ALSO HAS SMOKE AROUND AS WELL. THERE IS AT
LEAST A LOW PROBABILITY OF ALL SITES DROPPING BELOW 6 MILES AT
TIMES BUT FOR NOW KEPT ALL 6 OR ABOVE. EXPECT SOME 10 KNOT
GUSTING 20 KNOT UP VALLEY AFTERNOON WINDS AT PIH AND IDA AND
BYI.
FIRE WEATHER
ISSUED AT 118 PM MDT SAT AUG 8 2026
ELEVATED FIRE WEATHER CONDITIONS ARE ANTICIPATED THROUGH THE FIRST
PART OF NEXT WEEK DUE TO THE COMBINATION OF CRITICAL MINIMUM RH
VALUES AND GUSTY WINDS. WHILE MIN RH WILL LARGELY RANGE 10 TO 15
PERCENT THROUGHOUT THE PERIOD, WINDS WILL BE MARGINAL ACROSS MUCH OF
THE REGION. CONFIDENCE IN WINDS REACHING THRESHOLD IS HIGHER ACROSS
FIRE WEATHER ZONES 475 AND 476, WHERE WIDESPREAD GUSTS TO AT LEAST
25 MPH ARE EXPECTED WITH GUSTS REACHING 30 MPH ALONG RIDGELINES.
THEREFORE, A RED FLAG WARNING REMAINS IN EFFECT FROM 1 PM THROUGH 9
PM TODAY FOR THE TWO AFOREMENTIONED ZONES. UPON EXPIRATION, THE RED
FLAG WARNING WILL NEED TO BE REISSUED TO ACCOUNT FOR THIS EXTENDED
PERIOD OF DRY AND BREEZY CONDITIONS. WINDS WILL INCREASE SLIGHTLY
SUNDAY AND MONDAY, WHICH IS WHEN WE EXPECT MORE POCKETS OF RED FLAG
CONDITIONS TO MATERIALIZE ELSEWHERE, AS WELL. A RED FLAG WARNING MAY
BE WARRANTED FOR FWZ 410 ON MONDAY DUE TO MORE WIDESPREAD 30 MPH
WIND GUSTS.
A DEEPENING TROUGH ALONG THE PACIFIC COAST WILL CONTINUE TO
GRADUALLY FLATTEN THE RIDGE OF HIGH PRESSURE OVER IDAHO, RESULTING
IN A GRADUAL COOL-DOWN THROUGH LATE THIS UPCOMING WEEK. DAYTIME
HIGHS WILL RETURN TO AROUND NORMAL BY MID-WEEK, TURNING COOLER THAN
NORMAL LATE WEEK. DRY CONDITIONS WILL LINGER FOR ANOTHER WEEK OR SO,
WITH MODELS INDICATING THE RETURN OF MONSOON MOISTURE BY THE LATTER
HALF OF NEXT WEEK.
AIR QUALITY
ISSUED AT 209 AM MDT SAT AUG 8 2026
AN AIR QUALITY ADVISORY REMAINS IN EFFECT FOR CUSTER COUNTY THROUGH
MONDAY AFTERNOON DUE TO AIR QUALITY EXPECTED TO REMAIN IN THE
"MODERATE" TO "UNHEALTHY FOR SENSITIVE GROUPS" CATEGORIES.
PIH WATCHES/WARNINGS/ADVISORIES
HEAT ADVISORY UNTIL 11 PM MDT THIS EVENING FOR IDZ051>059-062.
AIR QUALITY ALERT UNTIL 3 PM MDT MONDAY FOR IDZ068>074.
RED FLAG WARNING UNTIL 9 PM MDT THIS EVENING FOR IDZ475-476.
DISCUSSION...AMM
AVIATION...GK
FIRE WEATHER...CROPP
AIR QUALITY...AMM
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