791  
FXUS63 KDTX 301937  
AFDDTX  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI  
337 PM EDT MON JUN 30 2025  
   
KEY MESSAGES
 
 
 
- SHOWERS AND THUNDERSTORMS ARE LIKELY TO CONTINUE THROUGH THE LATE  
AFTERNOON. THERE REMAINS A MARGINAL RISK (1 OUT OF 5) FOR SEVERE  
WEATHER UNTIL AROUND 7PM ACROSS ALL OF SOUTHEAST MICHIGAN. THE MOST  
LIKELY THREATS WILL BE DAMAGING WIND GUSTS TO 60 MPH AND FLOODING  
DUE TO TORRENTIAL RAINFALL RATES.  
 
- CLASSIC SUMMER WEATHER PATTERN DURING THE MIDDLE TO END OF THE  
WEEK WITH DAYTIME TEMPERATURES HOVERING IN THE LOW TO MID INTO THE  
80S.  
 

 
   
DISCUSSION
 
 
ANOTHER DAY FEATURING HIGH CAPE (PUSHING 3000 J/KG PER SPC  
MESOANALYSIS) AND LOW SHEAR (GENERALLY AROUND 20 KNOTS) IN A VERY  
MOIST ENVIRONMENT WITH SURFACE DEWPOINTS INTO THE LOW 70S AND PWATS  
EXCEEDING 1.7 INCHES. EARLY DAY CLOUDS HELPED PREVENT SOME  
DESTABILIZATION LOCALLY, BUT CLEARER SKIES OVER SW LOWER LEAD TO  
RAPID DESTABILIZATION IN THE VICINITY OF A PREFRONTAL TROUGH WHICH  
QUICKLY LEAD TO A LINE OF SHOWERS AND THUNDERSTORMS DEVELOPING. A  
MID LEVEL POCKET OF DRY AIR SLIDING OVER IS ALSO TO STEEPEN MID  
LEVEL LAPSE RATES HELPING SOME STORMS TO GET A LITTLE BETTER  
ORGANIZED. AS WE MOVE THROUGH THE LATE AFTERNOON AND EVENING, THE  
CURRENT LINE OF CONVECTION WILL CONTINUE EASTWARD WITH  
ISOLATED/SCATTERED STORMS DEVELOPING AHEAD OF IT. ISOLATED CELLS MAY  
BECOME STRONG TO SEVERE WITH PULSE TYPE STORMS PRODUCING WET  
MICROBURSTS. SO FAR MAJORITY OF THE STORMS HAVE STRUGGLED TO PRODUCE  
WINDS OVER 30 KNOTS. THESE STORMS ARE ALSO SLOW MOVING TRACKING  
EASTWARD AROUND 20 MPH SO HEAVY RAIN AND LOCALIZED FLOODING WILL  
ALSO BE A CONCERN. BULK OF THE ACTIVITY WILL COME TO AN END BETWEEN  
5-7PM TODAY WITH A FEW ISOLATED SHOWERS/STORMS POSSIBLY LINGERING  
UNTIL THE SURFACE COLD FRONT PUSHES THROUGH AFTER 8PM.  
 
LONGWAVE TROUGH AXIS SWING THROUGH TONIGHT INTO TUESDAY MORNING.  
MODELS TRY TO KEEP SOME POPS GOING THROUGH THE NIGHT ALONG THE LEAD  
EDGE OF THE TROUGH BUT THERE ISN'T MUCH SUPPORT FOR ADDITIONAL  
ACTIVITY WITH INSTABILITY TRENDING TOWARD ZERO AND SYNOPTIC FORCING  
LACKING. WILL TREND POPS DOWN TO SLIGHT CHANCE FOR NOW TO GIVE A  
CHANCE TO SEE THE TROUGH UPSTREAM AND WHETHER ITS CARRYING ANY  
SHOWERS WITH IT.  
 
REST OF THE WEEK GETS QUIETER AS THE RIDGE STARTS BUILDING BACK  
THROUGH THE PLAINS AND SLIDING EASTWARD THROUGH THE MID MS VALLEY.  
WE'LL LARGELY BE IN NORTHWESTERLY FLOW THROUGH THE WEEK WITH A FEW  
WAVES TRACKING THROUGH CANADA TRYING TO SEND SOME FRONTS INTO THE  
REGION. SO CAN'T RULE OUT A FEW SHOWERS THROUGH THE WEEK BUT WILL  
TAKE A MORE NOTABLE SYSTEM LIKE ON SUNDAY TO BRING MORE WIDESPREAD  
POPS TO THE REGION.  
 

 
   
MARINE
 
 
A COLD FRONT BRINGS SCATTERED SHOWERS AND THUNDERSTORMS THROUGH THE  
AFTERNOON WITH ACTIVITY GRADUALLY WINDING DOWN TONIGHT AS THE FRONT  
CLEARS THE AREA. LIGHT SOUTH WIND SHIFTS TO WESTERLY BEHIND THE  
FRONT, PEAKING AT 15 TO 20 KT ON TUESDAY AFTERNOON. HIGH PRESSURE  
OVER THE MIDWEST MAINTAINS PREVAILING WESTERLY WIND OVER THE GREAT  
LAKES THROUGH MID-WEEK. A WEAK COLD FRONT SINKS ACROSS THE AREA LATE  
WEDNESDAY INTO THURSDAY WITH POST-FRONTAL NORTHWEST WIND LIKELY TO  
REMAIN LIGHT. HIGH PRESSURE BUILDS ACROSS THE REGION ON FRIDAY TO  
PROVIDE LIGHT WIND AND WAVES.  
 

 
   
PREV DISCUSSION
 
 
ISSUED AT 1205 PM EDT MON JUN 30 2025  
 
AVIATION...  
 
AN INFLUX OF LOW AND MID LEVEL MOISTURE THIS MORNING HAS LED TO A  
WIDE ARRAY IN CEILINGS HEIGHTS ACROSS SE MI, WITH THE METRO DETROIT  
TERMINALS EXPERIENCING PERIODS OF MVFR BASED CEILINGS. THE GRADUAL  
DEPARTURE OF THE HIGHER CLOUD DECK IS OPENING THE DOOR TO RAPID  
DESTABILIZATION ACROSS SE MI. THIS WITHIN A MOIST AND UNCAPPED  
ENVIRONMENT HAS LED TO NUMEROUS THUNDERSTORMS ACROSS WRN LOWER MI,  
WHICH WILL SLOWLY DEVELOP AND ADVANCE ACROSS SE MI DURING THE EARLY  
PORTION OF THE AFTERNOON. GIVEN THE ONGOING EARLY CONVECTIVE  
RELEASE, THE PROBABILITIES OF THUNDERSTORMS BEYOND 21Z IS LESS  
PROBABLE AND WILL BE LEFT OUT OF THE TAFS. GIVEN THE POTENTIAL  
AFTERNOON CONVECTION AND ABUNDANT LOW LEVEL MOISTURE, SOME DEGREE OF  
LOW CLOUDS MAY LINGER INTO THE EARLY EVENING HOURS BEFORE A LITTLE  
BIT OF LOW LEVEL DRY AIR ADVECTION CLEARS THEM OUT.  
 
FOR DTW/D21 CONVECTION...THE DEPARTURE OF THE THICKER MORNING CLOUD  
COVER IS NOW DRIVING THE REGION OF BETTER INSTABILITY INTO THE METRO  
AIRSPACE. THE COMBINATION OF CONVECTIVE DEVELOPMENT AND UPSTREAM  
CONVECTION MOVING INTO THE AIRSPACE WILL LIKELY SUPPORT SCATTERED TO  
NUMEROUS THUNDERSTORMS THROUGH AT LEAST 20 OR 21Z. THE AFTERNOON  
CONVECTIVE RELEASE WILL MAKE CONVECTION AFTER 21-22Z LESS PROBABLE.  
 
THRESHOLD PROBABILITIES...  
 
* MODERATE IN THUNDERSTORMS THIS AFTERNOON.  
 
* MODERATE IN CEILINGS AOB 5000 FEET THIS AFTERNOON.  
 

 
   
DTX WATCHES/WARNINGS/ADVISORIES
 
 
MI...NONE.  
LAKE HURON...NONE.  
LAKE ST CLAIR...NONE.  
MICHIGAN WATERS OF LAKE ERIE...NONE.  

 
 

 
 
DISCUSSION...DRK  
MARINE.......TF  
AVIATION.....SC  
 
YOU CAN OBTAIN YOUR LATEST NATIONAL WEATHER SERVICE FORECASTS ONLINE  
AT WWW.WEATHER.GOV/DETROIT.  
 
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