929
FXUS63 KDTX 010547
AFDDTX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
147 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 MORE HUMID
THURSDAY AND FRIDAY.
- THE NEXT CHANCE OF RAIN DEVELOPS FRIDAY INTO NEXT WEEKEND.
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.
PREV DISCUSSION
ISSUED AT 338 PM EDT SUN MAY 31 2026
DISCUSSION...
EXCEPT FOR A FRINGE OF CIRRUS, ANOTHER CLOUDLESS DAY IS UNFOLDING
ACROSS LOWER MI WITH LOW HUMIDITY AND TEMPERATURES RIGHT AROUND
NORMAL TO FINISH OFF THE WEEKEND AND THE MONTH OF MAY. TEMPERATURES
RISING INTO THE MID 70S, COMBINED WITH BROAD AND FLAT SURFACE HIGH
PRESSURE, IS PROMOTING A TYPICAL LAKE BREEZE PATTERN TO KEEP
READINGS COOLER NEAR THE SHORELINES.
AFTERNOON SATELLITE OBSERVATIONS INDICATE AN ENERGETIC MID LEVEL
SHORT WAVE STILL MOVING DOWN FROM THE JAMES BAY REGION ON A
MERIDIONAL TRACK OVER THE EASTERN GREAT LAKES TONIGHT AND EARLY
MONDAY. THIS SYSTEM CARVES SOME HEIGHT FALLS INTO THE EASTERN FLANK
OF THE LARGER SCALE BLOCKING RIDGE WHILE PULLING A WEAK SURFACE
TROUGH/BACKDOOR FRONT THROUGH SOUTHERN ONTARIO. THE PRESSURE FEATURE
WASHES OUT QUICKLY BUT IS EFFECTIVE AT REINFORCING THE DRY AIR MASS
WITHOUT MUCH CHANGE EXPECTED TO HIGH TEMPERATURES DURING THE EARLY
WEEK PERIOD.
CONSENSUS OF 12Z DETERMINISTIC MODELS SHOWS THE 500 MB RIDGE
REBUILDING OVER THE WESTERN GREAT LAKES BY WEDNESDAY AND MAINTAINS
GOOD TIMING CONSISTENCY FROM OVER THE LAST FEW MODEL CYCLES. THIS IS
THE FIRST STAGE OF OMEGA BLOCK UNRAVELING AS THE UPPER JET PICKS UP
STRENGTH ACROSS BOTH THE NORTH PACIFIC AND NORTH ATLANTIC. THERE CAN
OFTEN BE SOME PREDICTABILITY ISSUES DURING THE TRANSITION, HOWEVER
THE TIMING AND SHAPE OF THE 500 MB STRUCTURE LOOK GOOD COMPARED TO
ENSEMBLE MEANS OVER THE LAST FEW FORECAST CYCLES. A WARMING TREND IS
THE ASSOCIATED WEATHER HIGHLIGHT IN THE GREAT LAKES TIED TO THE
INCREASING HEIGHT FIELD WHILE HUMIDITY REMAINS IN CHECK THROUGH
THURSDAY.
THE CURRENT ROCKIES CLOSED LOW COMPONENT OF THE BLOCKING PATTERN
BECOMES THE FOCUS OF RAIN POTENTIAL RETURNING BY FRIDAY. THE
CIRCULATION IS KICKED EASTWARD DURING THE LARGER SCALE ZONAL FLOW
TRANSITION WHILE INTERACTING WITH BROAD LEE SIDE SURFACE TROUGHING
ACROSS THE PLAINS. INCREASING POPS IN BLENDED GUIDANCE LOOKS
REASONABLE ACROSS THE GREAT LAKES AS PENT UP GULF MOISTURE RETURNS
NORTHWARD INTO THE REGION AHEAD OF THE LOW PRESSURE SYSTEM.
MARINE...
LIGHT AND VARIABLE WINDS OBSERVED THIS AFTERNOON ACROSS THE GREAT
LAKES AS HIGH PRESSURE WEAKENS OVERHEAD. A WEAK BACKDOOR COLD FRONT
DROPS THROUGH THE AREA TONIGHT, CAUSING WINDS TO FLIP TO THE
NORTHEAST AS HIGH PRESSURE EXPANDS IN FROM ONTARIO. NORTHEAST FLOW
ALONG SAGINAW BAY LEADS TO BREEZY CONDITIONS MONDAY AFTERNOON,
PROMPTING THE ISSUANCE OF A SMALL CRAFT ADVISORY FOR INNER SAGINAW
BAY. ELSEWHERE, GUSTS ARE CAPPED BELOW 20 KNOTS. EXTENDED STRETCH OF
DRY AND OVERALL FAVORABLE MARINE WEATHER PERSISTS THROUGH MUCH OF
THE WORK WEEK.
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.
AVIATION.....MANN/KGK
DISCUSSION...BT
MARINE.......MV
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