414
FXUS63 KAPX 271034
AFDAPX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GAYLORD MI
634 AM EDT SAT JUN 27 2026
KEY MESSAGES
- INCREASINGLY HOT AND HUMID NEXT WEEK WITH PERIODIC
THUNDERSTORM CHANCES.
DISCUSSION
ISSUED AT 148 AM EDT SAT JUN 27 2026
PATTERN SYNOPSIS AND FORECAST:
QUIET AND UNEVENTFUL WEATHER (OUTSIDE OF ANY FOG, ESPECIALLY THIS
MORNING) WILL PERSIST THROUGH THE REMAINDER OF THE WEEKEND AS
SPRAWLING SURFACE HIGH PRESSURE REMAINS LARGELY IN CONTROL,
PROMOTING SLOWLY MODERATING TEMPERATURES UNDER MOSTLY CLEAR SKIES.
AS WE TRANSITION INTO NEXT WEEK, A HIGHLY ANOMALOUS HEAT DOME,
CHARACTERIZED BY 597 DECAMETER MID LEVEL HEIGHTS, WILL INTENSIFY
ACROSS THE SOUTHEAST AND OHIO VALLEY BEFORE STEADILY BUILDING
NORTHWARD INTO THE GREAT LAKES REGION. CONSEQUENTLY, AN EXTENDED
PERIOD OF UNSEASONABLY HOT AND HUMID CONDITIONS IS EXPECTED TO
MATERIALIZE, WITH THE MOST OPPRESSIVE HEAT INDEX VALUES LIKELY
CONCENTRATING BETWEEN TUESDAY AND THURSDAY. THE MOST OBVIOUS FAIL
POINT FOR REACHING OUR ABSOLUTE MAXIMUM TEMPERATURE POTENTIAL WILL
BE THE INTRODUCTION OF ORGANIZED CONVECTION OR THICK CONVECTIVE
DEBRIS CLOUDS RADIATING FROM UPSTREAM COMPLEXES, WHICH WOULD ACT TO
SIGNIFICANTLY LIMIT DAYTIME INSOLATION. REGARDLESS OF THE EXACT HIGH
TEMPERATURES, A STEADY SURGE IN LOW-LEVEL MOISTURE WILL ENSURE THAT
HUMIDITY INCREASES NOTICEABLY. THE LATEST LREF GUIDANCE IS FIRMLY ON
BOARD WITH THIS SYNOPTIC EVOLUTION, PROJECTING WIDESPREAD UPPER 80S
TO MID 90S ACROSS THE INTERIOR FOR THE TUESDAY THROUGH THURSDAY
TIMEFRAME. THIS REPRESENTS A PRETTY SIGNIFICANT AND CONSISTENT
SIGNAL FROM THE GLOBAL ENSEMBLE MODELS, AND GIVEN THE SETUP, UPPER
90S NOT OUT OF THE QUESTION NEAR SAGINAW BAY. WHILE MESOSCALE
DETAILS REMAIN TO BE DETERMINED, THE OVERARCHING PATTERN SUPPORTS A
SEVERAL DAYS OF HOT AND HUMID WEATHER NEXT WEEK.
ALONGSIDE THE BUILDING HEAT, EXPECT PLENTY OF THERMODYNAMIC
INSTABILITY TO POOL ACROSS THE REGION NEXT WEEK. BEGINNING ON MONDAY,
PRECIPITABLE WATER VALUES ARE FORECAST TO SURGE WELL ABOVE
CLIMATOLOGICAL NORMS, ACCOMPANIED BY SURFACE DEWPOINTS REACHING INTO
THE 90S AND OCCASIONALLY TAPPING INTO THE LOWER 70S. BECAUSE
NORTHERN MICHIGAN WILL RESIDE DIRECTLY ON THE NORTHERN PERIPHERY OF
THE EXPANDING UPPER-LEVEL RIDGE, WE WILL BE SUSCEPTIBLE TO RIDGE
RIDING SHORT WAVES. THEREFORE, WE WILL HAVE TO CLOSELY MONITOR THE
EVOLUTION OF UPSTREAM CONVECTION TO OUR WEST, WHICH COULD PROPAGATE
EASTWARD INTO OUR AREA IN SOME FASHION. RIGHT NOW, THE BEST
POTENTIAL FOR SHOWERS AND STORMS APPEARS TO BE LATER SUNDAY INTO
MONDAY, COINCIDING WITH THE INITIAL SURGE OF NORTHWARD MOISTURE,
FOLLOWED BY ANOTHER WINDOW LATER TUESDAY, AND THEN PERIODICALLY
LATER IN THE WEEK. THE INHERENT SUBTLETIES OF THIS PATTERN, COMBINED
WITH HEAVY MESOSCALE DEPENDENCE REGARDING BOUNDARY INTERACTION AND
RESIDUAL CLOUD COVER, WILL UNDOUBTEDLY MAKE FOR A TRICK FORECAST.
PINING DOWN EXACT STORM COVERAGE AND ISOLATING ANY LOCALIZED SEVERE
WEATHER THREATS WILL BE CHALLENGING AT THIS LEAD TIME, SO WE WILL
CONTINUE TO MONITOR THE UPCOMING PATTERN CLOSELY.
AVIATION /12Z TAFS THROUGH 12Z SUNDAY/
ISSUED AT 634 AM EDT SAT JUN 27 2026
SOME LINGERING BR / FG THIS MORNING, PRIMARILY AFFECTING MBL.
OTHERWISE, VFR THROUGH THE FORECAST PERIOD, WITH JUST SOME HIGH
CLOUD CURRENTLY OVER NORTHERN LOWER THIS MORNING EVENTUALLY
CLEARING BY AFTERNOON. LIGHT EAST TO NORTHEAST WINDS TODAY,
LIKELY GOING CALM TONIGHT. MAY NEED TO WATCH FOR SOME ADDITIONAL
BR IN APN LATER TONIGHT.
APX WATCHES/WARNINGS/ADVISORIES
MI...NONE.
MARINE...NONE.
DISCUSSION...JLD
AVIATION...HAD
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