904
FXUS63 KDTX 221710
AFDDTX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
110 PM EDT WED JUL 22 2026
KEY MESSAGES
- DRY CONDITIONS WITH TEMPERATURES DIPPING BELOW AVERAGE DURING THE
MID TO LATE WEEK PERIOD.
- NEXT CHANCE AT PRECIPITATION SATURDAY NIGHT INTO SUNDAY.
AVIATION
BREEZY NORTHWEST WINDS GRADUALLY DECREASE THROUGH THE AFTERNOON-
EVENING AS SURFACE HIGH PRESSURE BECOMES MORE ESTABLISHED OVER SE
MI. HEALTHY VFR DIURNAL CU FIELD HAS DEVELOPED WITHIN THIS COOLER
FLOW AND PERSISTS THROUGH THE DAYLIGHT HOURS BEFORE DISSIPATING
OVERNIGHT.
D21/DTW CONVECTION...NO THUNDERSTORMS THROUGH THE TAF PERIOD.
DTW THRESHOLD PROBABILITIES
* LOW FOR CEILING 5000 FT OR LESS THIS AFTERNOON AND EVENING.
PREV DISCUSSION
ISSUED AT 323 AM EDT WED JUL 22 2026
DISCUSSION...
DEEP H3 TO H5(SUB 560DAM) TROUGHING IS IN PLACE ACROSS ALL OF THE
GREAT LAKES THIS MORNING WITH SURFACE EXTENSION OF COLD FRONT NOW
PUSHING SOUTHWARD THROUGH PORTIONS OF CENTRAL IN/OH. MUCH COOLER
CONDITIONS IN THIS SETUP AS 850MB TEMPERATURES CURRENTLY RANGE
BETWEEN +4C TO +6C AREAWIDE. SURFACE DEWPOINTS HAVE EASILY DROPPED
INTO THE 40S FOR MANY AREAS AND TEMPERATURES AT DAYBREAK ARE
EXPECTED TO BE IN THE LOWER 50S. PROJECTED ABSOLUTE VORTICITY CHARTS
SUPPORT ANOTHER VORTICITY MAXIMUM, COLLOCATED WITH COMPOSITE TROUGH
AXIS, DIGGING INTO THE LAKE HURON BETWEEN 18-00Z TODAY. NORTHERLY
GRADIENT WITH LEGITIMATE COLD POOL ALOFT OVER ONTARIO RESULTS IN
FRESH ISENTROPIC DOWNGLIDE AND COLD ADVECTION OVER THE AREA TODAY.
GUSTY WELL MIXED NORTHWEST SURFACE WINDS OF 10 TO 25 MPH TODAY.
FORECAST SOUNDINGS SUPPORT HIGH STATIC STABILITY IN THE 6.0 TO 16.0
KFT AGL YIELDING DRY CONDITIONS BUT WITH SOME BOUNDARY LAYER CUMULUS
THIS AFTERNOON.
FLOW TRAJECTORIES RAPIDLY EVOLVE TO ANTICYLONIC TONIGHT AS STRONG
SURFACE HIGH PRESSURE BUILDS INTO WISCONSIN. MAIN NARRATIVE TONIGHT
IS VERY CHILL NIGHTITME TEMPERATURES WITH THE POTENTIAL FOR SOME
AREAS OUTSIDE OF THE DETROIT URBAN HEAT ISLAND TO DIP INTO THE 40S.
MODERATING AND WARMING AIRMASS BETWEEN 4.0 AND 8.0 KFT AGL WILL DRY
OUT ANY LINGERING LOW-MID RELATIVE HUMIDITY FOR THE DAYTIME
THURSDAY. VERY COMFORTABLE WEATHER WILL EXIST THU WITH TEMPERATURES
IN THE UPPER 70S AND DEWPOINTS IN THE LOWER 50S. PROGRESSIVELY
WARMER FRIDAY AND SUNDAY WITH INCREMENTAL INCREASES IN SURFACE
HUMIDITY. LATEST INDICATIONS ARE SURFACE RIDGE AXIS WILL CONTINUE
TO HOLD THROUGH SOUTHEAST MICHIGAN.
JET EXIT REGION WITH ANTICYCLONICALLY WAVE BREAK PUSHES INTO LOWER
MICHIGAN FOR SUNDAY. MODELS SUGGEST SHORTWAVE ENERGY CASCADING IN
VICINITY OF THE SOUTHEAST MICHIGAN WITH RETURN OF WARM ADVECTION.
PERSISTENT NORTHWEST FLOW COULD LEAD TO A MORE ACTIVE PERIOD EARLY
NEXT WEEK WITH REGARDS TO PRECIPITATION. CURRENT FORECASTS SUGGEST
HIGHS IN THE 80S EARLY NEXT WEEK.
MARINE...
HIGH PRESSURE MOVES INTO THE AREA AFTER OUR COLD FRONT HAS FULLY
PASSED THE GREAT LAKES REGION, RESULTING IN SOME DRY WEATHER, AND
STRONG COLD AIR ADVECTION THAT WILL ENCOMPASS THE AREA FOR THE NEXT
COUPLE OF DAYS. WINDS WILL BE RELATIVELY GUSTY AND COMING OUT OF THE
NORTHWEST THROUGH TODAY THEN SUBSIDING ON THURSDAY. SMALL CRAFT
ADVISORIES REMAIN IN EFFECT FOR NEAR SHORE AREAS OF LAKE HURON
AROUND THE THUMB AND SAGINAW BAY. BEACH HAZARD STATEMENTS ARE IN
EFFECT AROUND THE THUMB THROUGHOUT TODAY AS WELL. CALMER CONDITIONS
CONTINUE FOR THE REST OF THE WEEK.
DTX WATCHES/WARNINGS/ADVISORIES
MI...BEACH HAZARDS STATEMENT UNTIL 10 PM EDT THIS EVENING FOR MIZ049.
LAKE HURON...SMALL CRAFT ADVISORY UNTIL 10 PM EDT THIS EVENING FOR LHZ421-
441>443.
SMALL CRAFT ADVISORY UNTIL 4 PM EDT THIS AFTERNOON FOR LHZ422.
LAKE ST CLAIR...NONE.
MICHIGAN WATERS OF LAKE ERIE...NONE.
AVIATION.....KDK
DISCUSSION...CB
MARINE.......TO/MV
YOU CAN OBTAIN YOUR LATEST NATIONAL WEATHER SERVICE FORECASTS ONLINE
AT WWW.WEATHER.GOV/DETROIT.
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