123
FXUS63 KDTX 010742
AFDDTX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
342 AM EDT MON JUN 1 2026
KEY MESSAGES
- DRY WEATHER WITH PLENTIFUL SUNSHINE CONTINUES THROUGH MID WEEK.
- NEAR NORMAL TEMPERATURES EARLY WEEK BECOME WARMER AND MUCH MORE
HUMID INTO NEXT WEEKEND.
- THE NEXT CHANCE OF RAIN DEVELOPS FRIDAY AND CONTINUES THROUGH THE
WEEKEND.
DISCUSSION
SIGNIFICANT MID TO UPPER LEVEL TROUGH AXIS ALONG THE EASTERN FLANK
OF THE OMEGA BLOCK WILL DIG/PIVOT ACROSS LAKE HURON AND LOWER
MICHIGAN TODAY. A WEAK KINEMATIC IMPULSE OR VERY MODEST JETLET
FEATURE FROM AN ATYPICAL NORTHEAST DIRECTION WILL RESULT IN VERY
DEEP ISENTROPIC DOWNGLIDE/SUBSIDENCE EVENT AND DRIVE A DEWPOINT
FRONT FIRST THROUGH THE THUMB BY 18Z AND THROUGH THE REMAINDER OF
THE FORECAST AREA BY 00Z THIS EVENING. GUSTY NORTHEAST WINDS ARE
AGAIN EXPECTED BEHIND THE FRONT WITH 15 TO 30 MPH POSSIBLE (GREATEST
WINDS OVER THE WATER). WEAK HEIGHT FALLS ASSOCIATED WITH THE TROUGH
AND A THERMAL LOW RESPONSE WILL LIKELY POOL SOME MODEST SURFACE
BASED THETAE AHEAD OF THE DRY FRONT. QUITE POSSIBLE THAT SOME HIGH
BASED BOUNDARY LAYER CLOUD WILL BE OBSERVED OVER PORTIONS OF LOWER
MICHIGAN PARTICULARLY WEST OF US 23 THIS AFTERNOON. LOSS OF DAYTIME
HEATING AND DRY AIR ADVECTION WILL CHOKE OFF ANY CLOUD AND CAUSE IT
TO DISSIPATE AFTER 23Z.
GREATER UPPER LEVEL JET ENERGY TO THE EAST OF THE BLOCKING PATTERN
IS EXPECTED TO RESULT IN A TUGGING OR MORPHING OF THE GEOPOTENTIAL
HEIGHTS INTO A MORE REX LIKE CONFIGURATION FOR TUESDAY AND
WEDNESDAY. THERE HAS BEEN CONSISTENCY AMONGST THE MODELS THAT
GREATEST RIDGING ALOFT WILL FOLD AND BUILD DIRECTLY OVER SOUTHEAST
MICHIGAN FOR TUESDAY AND WEDNESDAY. AGAIN THE NAEFS DATASET SUPPORTS
99.5TH PERCENTILE OR CLIMATOLOGICAL MAXIMUM FOR GEOPOTENTIAL HEIGHTS
FOR A DEEP PORTION OF THE COLUMN FROM 1000MB UP TO 500MB. THE
INCREASED HEIGHT THICKNESS LEADS TO WARMING WITH HIGHS NEAR 80
DEGREES TUESDAY WITH LOWER 80S POSSIBLE ON WEDNESDAY.
A CONSENSUS OF GLOBAL DETERMINISTIC GUIDANCE SUGGESTS THAT MOISTURE
COLLECTED ALONG THE UPSTREAM EDGE OF THE BLOCKING WILL FINALLY
RELEASE INTO THE GREAT LAKES REGION AND MICHIGAN BY FRIDAY AND
SATURDAY. VERY LOW CONFIDENCE EXISTS ON THE MOST FAVORED TIME PERIOD
FOR PRECIPITATION ONSET AT THE END OF THE WEEK. THE MAIN REASON FOR
THE LOW CONFIDENCE IS BECAUSE OF LIKELY MCS AND/OR LATENT HEATING
DYNAMICS. DO NOT HAVE ANY CONFIDENCE THE MODELS HAVE THE IMPACT OF
THE LATENT HEATING CORRECT. LOTS OF UNCERTAINTY ALSO EXISTS ON
DURATION OF PRECIPITATION CHANCES AS THE LATEST ECMWF SOLUTIONS
SUGGESTS THE POSSIBILITY OF A STALLING BAROCLINIC ZONE DEVELOPING
RIGHT THROUGH NEXT WEEKEND. THE MAIN NARRATIVE IS MUCH WARMER AND
MUCH MORE HUMID NEXT WEEKEND.
MARINE
FLOW HAS STARTED ORGANIZING OUT OF THE NORTHEAST THIS MORNING AS A
WEAK BACKDOOR COLD FRONT DROPS ACROSS THE AREA. GENERALLY RELAXED
GRADIENT CAPS WIND GUSTS AROUND 20 KNOTS FOR MOST OF THE WATERS,
ALTHOUGH GUSTS TO 25 KNOTS ARE EXPECTED FOR INNER SAGINAW BAY WHERE
FLOW ALIGNS WITH THE FETCH OF THE BAY. FAVORABLE MARINE CONDITIONS
AND DRY WEATHER EXPECTED THROUGH MOST OF THE WEEK AS HIGH PRESSURE
BUILDS OVERHEAD. EXTENDED STRETCH OF DRY WEATHER COMES TO AN END
FRIDAY-THIS WEEKEND AS THE HIGH PRESSURE PATTERN BREAKS DOWN.
PREV DISCUSSION
ISSUED AT 147 AM EDT MON JUN 1 2026
AVIATION...
THE SURFACE LAYER HAS DECOUPLED EARLY TONIGHT - ALLOWING THE SURFACE
WINDS TO NEARLY VANISH. THE ONLY CLOUDS ARE A THICKER CIRRUS
FILAMENT ALONG THE EDGE OF THE HIGH CLOUD SHIELD LINGERING OVER THE
SOUTHERN TERMINALS, WHICH WILL REMAIN SO THROUGH MOST OF THE NIGHT.
MAIN STORY FOR MONDAY WILL BE THE BOOST THE SURFACE HIGH GETS FROM
THE BIG COLD WATER OF THE GREAT LAKES. A RATHER AGGRESSIVE
NORTHEAST FLOW RELEASE IS EXPECTED OFF OF LAKE HURON, STARTING
MIDDAY DOWNSTREAM OF SAGINAW BAY AND BY MID-AFTERNOON FARTHER INLAND
AT FNT AND PTK, THEN EVENTUALLY DET AS THE RELEASE WORKS SOUTH INTO
THE ST CLAIR BASIN. GUSTS WILL BE PROMINENT - APPROACHING 25KTS AT
MBS AND A LITTLE TAMER FARTHER AWAY FROM LAKE HURON. THE LAKE ERIE
INFLUENCE WILL NOT BE AS PRONOUNCED - HOWEVER, STILL EXPECTING A
LATE AFTERNOON RELEASE AFFECTING DTW/YIP - BUT NOT WITH THE VIGOR
SEEN FARTHER NORTH. THE LAKE ERIE BOUNDARY MAY ALSO EXCITE SOME
HIGH BASED CUMULUS FOR A FEW HOURS, BUT WILL REMAIN ABOVE 5KFT.
D21/DTW CONVECTION...NO THUNDERSTORMS THROUGH MONDAY.
DTW THRESHOLD PROBABILITIES...
* NONE.
DTX WATCHES/WARNINGS/ADVISORIES
MI...NONE.
LAKE HURON...SMALL CRAFT ADVISORY FROM NOON TODAY TO 10 PM EDT THIS EVENING FOR
LHZ422.
LAKE ST CLAIR...NONE.
MICHIGAN WATERS OF LAKE ERIE...NONE.
DISCUSSION...CB
MARINE.......MV
AVIATION.....MANN/KGK
YOU CAN OBTAIN YOUR LATEST NATIONAL WEATHER SERVICE FORECASTS ONLINE
AT WWW.WEATHER.GOV/DETROIT.
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page