180
FXUS65 KPIH 041044
AFDPIH
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE POCATELLO ID
444 AM MDT SAT APR 4 2026
KEY MESSAGES
- UPPER LEVEL HIGH PRESSURE DOMINATES THE WESTERN STATES,
KEEPING SKIES MOSTLY CLEAR AND CONDITIONS DRY.
- WARMING TREND TO BOTH HIGHS AND LOWS STARTS THIS AFTERNOON AND
CONTINUES UNTIL TEMPERATURES LEVEL OFF ON TUESDAY.
- INTENSE LOW MOVING THROUGH SOUTHERN CANADA BRINGS LIGHT
PRECIPITATION AND STRONG TO VERY STRONG WIND BY TUESDAY
AFTERNOON.
DISCUSSION
ISSUED AT 142 AM MDT SAT APR 4 2026
TODAY THROUGH MON NIGHT...SATELLITE IMAGERY INDICATES STRATUS
AND FOG FROM ISLAND PARK SOUTH TO MONTPELIER THIS EARLY MORNING.
OTHERWISE SKIES ARE CLEAR UNDER A BUILDING HIGH PRESSURE
CENTERED IN SOUTHERN NV WITH A NEGATIVE TILT TO THE NORTHWEST,
THROUGH SOUTHERN OR AND WESTERN WA. THIS SLOWS COOLING FOR
EASTERN IDAHO WITH THE NORTHWESTERLY FLOW, SO WARM UP WILL NOT
BE FAST. HOWEVER, EVEN MY MON TEMPERATURES IN THE EASTERN MAGIC
VALLEY AND LOWER SNAKE RIVER PLAIN WILL REACH AT LEAST AROUND 70
DEGREES, IF NOT HIGHER.
WIND UNDER HIGH PRESSURE IS TYPICALLY SLOPE-VALLEY INTERACTION
FOR DIRECTION AND LIGHT. NO DEVIATION HERE, SO THERE IS A BREAK
FROM THE WIND THROUGH MON NIGHT.
TUE THROUGH FRI...ENSEMBLES ARE IN GOOD AGREEMENT ON THE NEXT
LOW TO AFFECT IDAHO WEATHER. A TROUGH DIGGING SOUTH
SOUTHEASTWARD FROM BRITISH COLUMBIA, THEN MOVING THROUGH
SOUTHERN ALBERTA WILL BRING LIGHT PRECIPITATION THIS FAR SOUTH
AND TIGHTEN UP THE GRADIENT FOR A POTENTIAL WIND EVENT TUE
AFTERNOON. THIS FEATURE BRINGS COOLER AIR, BUT TEMPERATURES
SHOULD STAY AT OR JUST ABOVE CLIMATIC NORMALS FOR THE TIME OF
YEAR.
THE REST OF THE FORECAST, AS IS TYPICAL FOR SPRING SYSTEMS,
THERE IS A GREAT DEGREE OF VARIABILITY ON WHAT HAPPENS IN THE
UPSTREAM AFTER THIS FIRST LOW. MOST OF THE CLUSTERS HAVE A CUT-
OFF LOW DEVELOPING OFF THE CANADIAN TROUGH AND MOVING TO JUST
OFF THE CA COAST. THIS SPLITS THE UPPER LEVEL AIR FLOW WITH A
BRANCH IN CANADA AND THE OTHER BRANCH MOVING THROUGH THE DESERT
SOUTHWEST. THIS LEAVES THE NORTHERN ROCKIES IN THE DRY AREA IN
BETWEEN. BUT ABOUT 40 PERCENT OF THE CLUSTER SOLUTIONS KEEP THIS
TROUGH TOGETHER, SITTING OVER THE NORTHERN ROCKIES. THIS WOULD
MEAN SOME PRECIPITATION AND COOLER TEMPERATURES. AND POSSIBLY
SOME STRONG WINDS SHOULD A SHORTWAVE REINFORCE THIS TROUGH. THIS
WOULD MAINLY AFFECT THU AND FRI OF THIS COMING WEEK. THE NBM
GUIDANCE APPEARS TO SPLIT THE DIFFERENCE, WITH TEMPERATURES
CLOSER TO NORMAL AND PRECIPITATION THREAT SLIGHTLY HIGHER THAN
CLIMATIC AVERAGE, WITH SLIGHTLY ELEVATED WIND.
AVIATION /12Z TAFS THROUGH 12Z SUNDAY/
ISSUED AT 440 AM MDT SAT APR 4 2026
MORNING CIG AT KDIJ AS THE STRATUS HAS BEEN SLOW TO LEAVE UNDER
NORTHWEST UPPER LEVEL FLOW CREATING SOME UPSLOPE FLOW AND CLOUD
DEVELOPMENT. OTHERWISE, AFTER IT EVAPORATES IN THE LATE MORNING,
LIKE EVERYWHERE ELSE, CIGS WILL BE UNLIMITED WITH NO VSBY
IMPACTS, EITHER. WESTERN AIRDROMES WILL BE MOSTLY SKC. ANY
CLOUDS AT ALL WOULD BE PRODUCED BY SURFACE HEATING AND THUS
WOULD BE FEW CUMULULS DEVELOPMENT.
WIND IS VERY LIGHT AND, WHEN NOT VARIABLE, SHOULD FOLLOW
AFTERNOON UPSLOPE CONDITIONS AND EVENING DRAINAGE WIND.
PIH WATCHES/WARNINGS/ADVISORIES
NONE.
DISCUSSION...MESSICK
AVIATION...MESSICK
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