689
FXUS63 KDTX 041930
AFDDTX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
330 PM EDT THU JUN 4 2026
KEY MESSAGES
- WARM THROUGH TOMORROW.
- PERIODS OF SCATTERED TO NUMEROUS RAIN SHOWERS WITH EMBEDDED
THUNDERSTORMS FRIDAY AFTERNOON INTO FRIDAY NIGHT.
- ADDITIONAL SHOWERS AND STORMS ARE LIKELY SATURDAY AFTERNOON.
ISOLATED TO SCATTERED STORMS MAY BE STRONG TO SEVERE, CAPABLE OF
PRODUCING DAMAGING WIND GUSTS AND LARGE HAIL.
- A HOT AND STORMY PATTERN IS BECOMING INCREASINGLY LIKELY DURING
THE MIDDLE OF NEXT WEEK.
DISCUSSION
WARM AND DRY CONDITIONS PERSIST THROUGH THIS EVENING AS THE
PROLONGED RIDGE SETUP MAINTAINS CONTROL FOR ONE MORE NIGHT. THE
REMAINING INFLUENCE OF THE RIDGE SHRINKS OFF TO THE SOUTHEAST FRIDAY
MORNING WITH DEEP LAYER SOUTHWEST FLOW ENSUING THE REST OF THE DAY.
REMNANT CAPPING MAINTAINS DRY CONDITIONS ACROSS THE WHOLE AREA
INITIALLY, THEN A SHORTWAVE WORKS INTO MID MI BY THE EARLY AFTERNOON
WHICH HELPS ERODE THE CAP AND USHERS IN A LOW-LEVEL THETA-E RIDGE. A
CLUSTER OF SHOWERS IS LIKELY TO SPREAD INTO MID MI AT THE NOSE OF
THE LLJ, THEN WORK ACROSS THE THUMB. MID-LEVEL LAPSE RATES DURING
THIS PERIOD ARE FORECAST TO BE WEAK TO MITIGATE THE THREAT FOR
SEVERE WEATHER, BUT AS HIGHER BOUNDARY LAYER DEW POINTS ADVECT IN,
ENOUGH INSTABILITY WILL ALLOW FOR SCATTERED EMBEDDED THUNDERSTORMS.
FARTHER SOUTH TOWARD THE METRO DETROIT VICINITY, THE CAP HOLDS ON
THROUGH MUCH OF THE DAY AND ALLOWS TEMPS TO CLIMB INTO THE UPPER 80S
AND NEAR 90 WITH RELATIVELY LOWER RAIN CHANCES.
HIGHER INSTABILITY BUILDS IN FRIDAY EVENING AND OVERNIGHT AHEAD OF A
SURFACE TROUGH, PROVIDING FUEL AND FORCING FOR ADDITIONAL SHOWERS
AND THUNDERSTORMS TO SPREAD ACROSS ALL OF SE MI. SEVERE CHANCES
DURING THIS WINDOW REMAIN LOW GIVEN WEAK LAPSE RATES AND WEAKENING
WIND SHEAR, BUT COVERAGE OF CONVECTION LOOKS TO BE AT ITS HIGHEST
AND CAN'T TOTALLY RULE OUT A STRONGER CELL CAPABLE OF MARGINAL
SEVERE WEATHER. A LULL IN SHOWER/STORM COVERAGE IS THEN LIKELY
SATURDAY MORNING AS A SUBSIDENCE BUBBLE FOLLOWS PASSAGE OF THE
SURFACE TROUGH, ALLOWING AN INVERSION TO STRENGTHEN AND PROVIDE
HIGHER STABILITY. AS DAYTIME HEATING ERODES THIS CAP, STEEPER LOW
LEVEL LAPSE RATES DEVELOP AND ALLOW SBCAPE TO PUSH 1000+ J/KG BY
EARLY SATURDAY AFTERNOON. A WEAKLY FORCED COLD FRONT WILL SINK
SOUTHWARD ACROSS THE AREA AND PROVIDE THE NEXT POTENTIAL TRIGGER FOR
CONVECTION, SOME OF WHICH MAY BECOME STRONG TO SEVERE. TALL SKINNY
CAPE AND UNIDIRECTIONAL SHEAR POINT TO WATER-LOADED DOWNBURSTS AS
THE PRIMARY THREAT, BUT CAN'T RULE OUT LARGE HAIL IN ANY STRONGER
CORES. COOLER AND MORE STABLE AIR WORKS IN SATURDAY EVENING TO BRING
AN END TO RAIN CHANCES.
SHARPLY RISING MID-LEVEL GEOPOTENTIAL HEIGHTS PROVIDE HIGHLY STABLE
CONDITIONS ON SUNDAY, OFFERING DRY AND SEASONABLE SUMMER WEATHER
THAT EXTENDS INTO MONDAY AS WELL. ENSEMBLE GUIDANCE IS IN STRONG
AGREEMENT FOR AN ANOMALOUS UPPER RIDGE TO DEVELOP NEAR HUDSON BAY
EARLY NEXT WEEK. OUR POSITION JUST UPSTREAM OF THE RIDGE AXIS FAVORS
PLACEMENT WITHIN AN AREA OF HOT AND UNSTABLE CONDITIONS. DAILY
TEMPERATURES WILL BE SUBJECT TO TIMING OF CONVECTION, WHICH CARRIES
HIGH UNCERTAINTY AT THIS STAGE. MAGNITUDE OF 850MB AIR MASS AT
AROUND 15 TO 18C WILL BE SUPPORTIVE OF HIGHS IN THE MID TO UPPER
80S, AND LOWER 90S LOOK INCREASINGLY LIKELY BY LATE WEEK.
MARINE
WARM SOUTHERLY FLOW WILL KEEP WIND SPEEDS IN CHECK (MAINLY UNDER 20
KNOTS) DUE TO THE INCREASED LOW LEVEL STABILITY THROUGH TOMORROW. A
SURFACE LOW TRACKING THROUGH THE CENTRAL GREAT LAKES TOMORROW
EVENING WITH BRING NUMEROUS SHOWERS AND A FEW THUNDERSTORMS TO THE
REGION. EXPECTED LIGHT, MOSTLY WESTERLY WINDS ON SATURDAY. A WEAK
COLD FRONT WILL SINK SOUTHWARD LATE IN THE DAY, SERVING AS THE FOCAL
POINT FOR SCATTERED, POTENTIALLY MARGINALLY SEVERE THUNDERSTORMS,
WITH THE HIGHEST PROBABILITY OVER LAKE ST. CLAIR AND LAKE ERIE. VERY
LIGHT NORTHEAST FLOW AND DRY CONDITIONS WILL FOLLOW FOR SATURDAY
NIGHT AND SUNDAY. WARM WEATHER RETURNS EARLY NEXT WEEK, BRINGING A
CHANCE OF SHOWERS AND THUNDERSTORMS ON TUESDAY.
HYDROLOGY
CLUSTERS OF SHOWERS AND THUNDERSTORMS ARE FORECAST TO TRACK WEST TO
EAST ACROSS SOUTHEAST MI FRIDAY AFTERNOON THROUGH FRIDAY NIGHT.
ANOTHER ROUND OF SHOWERS AND STORMS IS LIKELY SATURDAY AFTERNOON.
MOST AREAS WILL RECEIVE A QUARTER INCH OF RAINFALL OR LESS, BUT
THERE WILL BE THE POTENTIAL FOR LOCALIZED AREAS TO SEE UP TO 1.50
INCHES. THE EXTENDED PERIOD OF DRY CONDITIONS RECENTLY SUGGESTS THE
POTENTIAL FOR FLOODING IS LOW, BUT ISOLATED FLOODING WILL BE
POSSIBLE IF ANY OF THE HIGHER AMOUNTS AFFECT THE TYPICAL FLOOD PRONE
LOCATIONS IN URBAN AREAS.
PREV DISCUSSION
ISSUED AT 116 PM EDT THU JUN 4 2026
AVIATION...
RESIDENT HIGH PRESSURE CONTINUES TO COMMAND VFR CONDITIONS ACROSS
THE TAF SITES FOR THE REST OF TODAY. SOUTHWEST WIND FEATURES
OCCASIONAL GUSTS IN THE UPPER TEENS THROUGH THE DIURNAL CYCLE. WINDS
TREND TOWARD CALM OVERNIGHT BENEATH A PERSISTENT CANOPY OF HIGH
CIRRUS. GRADIENT FLOW STRENGTHENS AGAIN FRIDAY AHEAD OF AN ADVANCING
COLD FRONT THAT WILL LEAD TO SHOWERS AND SOME THUNDERSTORMS BY THE
EVENING HOURS, CURRENTLY OUTSIDE THE TAF PERIOD FOR SITES OTHER THAN
DTW. PRIOR TO 18Z FRIDAY, CEILINGS WILL FILL IN AND BEGIN TO LOWER
INTO THE MID-LEVELS WHILE STAYING VFR.
D21/DTW CONVECTION...SHOWERS WITH SOME EMBEDDED THUNDERSTORM
STRUCTURES ARE POSSIBLE AFTER 21Z FRIDAY.
DTW THRESHOLD PROBABILITIES...
* MEDIUM FOR THUNDER FRIDAY EVENING.
DTX WATCHES/WARNINGS/ADVISORIES
MI...NONE.
LAKE HURON...NONE.
LAKE ST CLAIR...NONE.
MICHIGAN WATERS OF LAKE ERIE...NONE.
DISCUSSION...TF
MARINE.......SF
HYDROLOGY....TF
AVIATION.....KGK
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