738
FXUS63 KDTX 082009
AFDDTX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
309 PM EST THU JAN 8 2026
KEY MESSAGES
- MILD TONIGHT AND FRIDAY. WIDESPREAD RAIN SHOWERS TONIGHT.
- WINDY FRIDAY, GUSTS 35 TO 45 MPH POSSIBLE.
- RAIN AND WET SNOW SATURDAY TRANSITIONS TO SNOW SHOWERS SATURDAY
NIGHT AND SUNDAY. SNOW SQUALLS ARE POSSIBLE SUNDAY.
DISCUSSION
THE MID LEVEL SHORT WAVE FEATURE NOW OVER THE CENTRAL US WILL LIFT
ACROSS THE NORTHERN GREAT LAKES FRIDAY, WHILE THE ASSOCIATED SFC LOW
TRACKS ACROSS THE STRAITS REGION EARLY FRI MORNING. THERE WILL BE AN
IMPRESSIVE WIND FIELD THROUGH A DEEP LAYER IN ADVANCE OF THIS WAVE,
WITH A 60-70 KNOT 925MB LOW LEVEL WIND MAXIMUM FORECAST TO LIFT
ACROSS SE MI OVERNIGHT. THIS WILL MAKE FOR EFFICIENT MOISTURE
TRANSPORT INTO LOWER MI AHEAD OF THE ASSOCIATED SFC COLD FRONT.
ONGOING GULF MOISTURE INFLUX IS ALREADY UNDERWAY ACROSS THE SOUTHERN
AND MID MISSISSIPPI VALLEY, WITH THE 12Z MODEL SUITE IN GOOD GENERAL
AGREEMENT OF PRECIPITABLE WATER VALUES RISING TO 1.1 TO 1.3 INCHES
ACROSS SE MI OVERNIGHT. THE INITIAL SURGE IN MID LEVEL THETA E
ADVECTION WILL OCCUR THIS EVENING, RESULTING IN A REGION OF LIGHT
RAIN PROGRESSING NORTHWARD ACROSS THE AREA. PERSISTENT ISENTROPIC
ASCENT AND WEAK ELEVATED INSTABILITY WITHIN THE MOIST AXIS WILL
SUSTAIN OCCASIONAL SHOWERS THROUGH THE NIGHT, WITH SOME ISOLATED
THUNDERSTORMS POSSIBLE. A LINE OF SHALLOW CONVECTION IS ALSO
FORECAST TO ACCOMPANY THE SFC COLD FRONT ACROSS SE MI IN THE 15Z TO
18Z TIME FRAME FRIDAY.
THE SUITE OF ENSEMBLE MEMBERS INDICATE SOME VARIANCE ON POTENTIAL
SURFACE GUSTS TONIGHT INTO FRIDAY MORNING, WHICH RESULTS IN THE
DIFFERENCE BETWEEN ADVISORY CRITERIA GUSTS (45M PH) OR SUB ADVISORY
WINDS. THIS UNCERTAINTY IS RELATED TO BOUNDARY LAYER STABILITY
CONCERNS. SOUTHERLY FLOW WILL DRIVE TEMPERATURES WELL INTO THE 50S
TONIGHT. GIVEN CURRENT TEMPS ACROSS THE OHIO VALLY, THE POTENTIAL
FOR A FEW LOCALS TO BREAK 60 FRI MORNING PRIOR TO FROPA CAN NOT BE
RULED OUT. EVEN WITH THIS DEGREE OF WARMING IN THE BOUNDARY LAYER,
MIXING DEPTHS WITHIN THE PREFRONTAL WARM SECTOR WILL BE QUITE
LIMITED, SUPPORTIVE OF HOLDING WIND GUSTS BELOW 45 MPH. THERE WILL
BE SHALLOW FRONTOGENETICAL FORCING ALONG THE SFC FRONT FRIDAY, WHICH
LEADS TO AN INCREASED RISK OF A SECOND PERIOD OF STRONGER GUSTS
WITHIN THE IMMEDIATE POST FRONTAL SUBSIDENCE REGION AS LOW LEVEL
LAPSE QUICKLY STEEPENING WITH THE ONSET OF COLD AIR ADVECTION. THIS
IS THE PERIOD OF CONCERN FOR POTENTIAL ADVISORY LEVEL WIND GUSTS.
THE POTENTIAL BREVITY OF THE IDEAL MIXING PROFILE CORRESPONDING WITH
THE AXIS OF STRONG WINDS ARGUES HOLDING OFF ON THE ISSUANCE OF A
WIND ADVISORY FOR FRIDAY THIS FORECAST CYCLE.
AMPLIFICATION OF AN UPPER WAVE IN THE LEE OF THE CANADIAN ROCKIES
FRIDAY IS FORECAST TO EVOLVED INTO A DEEP CLOSED UPPER LOW OVER THE
WESTERN GREAT LAKES SATURDAY. ASSOCIATED SURFACE CYCLOGENESIS IS
FORECAST ACROSS THE EASTERN GREAT LAKES. A DEEP LAYER MOIST PLUME
CONTINUES TO BE SHOWN BY MODEL SOLUTIONS TO BE SHUNTED EAST OF THE
REGION, WITH A CONTINUED TREND TOWARD NON PHASING WITH A SOUTHERN
STREAM WAVE. AN INITIAL INFLUX OF POSITIVE MID LEVEL VORTICITY
ADVECTION ACROSS SE MI SATURDAY WILL SUPPORT A GOOD CHANCE FOR
PRECIPITATION. THE THERMAL PROFILE ACROSS THE FORECAST AREA GIVES
HIGHER CHANCES FOR RAIN ACROSS THE EASTERN HALF OF THE FORECAST
AREA, WITH WET SNOW FAVORED ACROSS THE WEST. THE UPPER LOW WILL MOVE
ACROSS LOWER MI AND LAKE HURON SATURDAY NIGHT AND SUNDAY. THE
COMBINATION OF WRAP AROUND MOISTURE, A MID LEVEL COLD POOL AND LAKE
ENHANCEMENT WILL SET THE STAGE FOR OCCASIONAL SNOW SHOWERS, SOME OF
WHICH MAY BE BRIEFLY INTENSE.
MARINE
A STRONG LOW PRESSURE SYSTEM REMAINS ON TRACK TO TRAVERSE FROM THE
CENTRAL PLAINS INTO THE NORTHERN GREAT LAKES THROUGH TOMORROW
MORNING. THE PRESSURE GRADIENT WILL QUICKLY STRENGTHEN WITH THE
ARRIVAL OF THE LOW, WHICH WILL RESULT IN SUSTAINED WIND SPEEDS OF 20
TO 30 KNOTS LATE TONIGHT THROUGH TOMORROW MORNING. DESPITE THE VERY
STABLE LOW LEVEL PROFILES, THE STRENGTH OF THE PRESSURE GRADIENT
WILL LIKELY AFFORD A WINDOW FOR SOME LOW-END GALES FAVORED ACROSS
SOUTHERN AND CENTRAL LAKE HURON, WHERE GALE WARNINGS REMAIN IN
PLACE.
A STRONG COLD FRONT WILL THEN MOVE ACROSS THE GREAT LAKES AS
THE LOW PRESSURE SYSTEM DEPARTS, WHICH WILL VEER WIND DIRECTION FROM
SOUTH TO NORTHWEST. COLD AIR BEHIND THE FRONT WILL RAPIDLY DECREASE
OVER LAKE STABILITY AND WILL BOOST MIXING DEPTHS, BRINGING HIGHER
CONFIDENCE FOR GUST TO GALES LEADING INTO THE EVENING HOURS.
IMMEDIATELY ALONG AND BEHIND THE FRONT, A QUICK POP OF AN ISOLATED
GUST TO HIGH-END GALES AROUND 45 KNOTS WILL BE LIKELY IN THE
AFTERNOON ACROSS LAKE HURON. A CHANGE TO NOTE FOR THIS AFTERNOON
FORECAST IS THE ADDITION OF A GALE WARNING FOR NORTHERN LAKE HURON
AS CONFIDENCE REGARDING GUST TO GALES HAS INCREASED BEHIND THE COLD
FRONT.
SMALL CRAFT ADVISORIES REMAIN IN PLACE FOR ALL ICE FREE NEARSHORE
ZONES, WHERE GUSTS AROUND 30 KNOTS WILL BE LIKELY THROUGH TOMORROW.
THE EXCEPTION WILL BE ALONG AND IMMEDIATELY BEHIND THE
AFOREMENTIONED COLD FRONT, WHERE A QUICK POP TO GUST TO GALES WIL BE
LIKELY. LAST, WIDESPREAD RAIN WILL ACCOMPANY THE LOW PRESSURE SYSTEM
TONIGHT AND TOMORROW. HIGH PRESSURE RAPIDLY BUILDS IN BEHIND THE
COLD FRONT, DIMINISHING STRONGER WINDS LEADING INTO SATURDAY.
HYDROLOGY
OCCASIONAL RAIN SHOWERS WILL AFFECT THE ENTIRE REGION TONIGHT INTO
FRIDAY MORNING. THERE IS MODERATE TO HIGH PROBABILITIES FOR A
QUARTER INCH OF RAIN, WITH LOWER PROBABILITIES FOR A HALF INCH TO
INCH. THE SAGINAW VALLEY REGION HAS A LITTLE HIGHER TOTAL QPF
PROBABILITIES, WITH LOW CHANCES FOR TOTAL RAIN TO EXCEED ONE INCH.
THE RAINFALL AMOUNTS ARE NOT EXPECTED TO BE ENOUGH TO PRODUCE
FLOODING.
CLIMATE
THE RECORD HIGH TEMPS FOR FRIDAY, JANUARY 9TH.
DETROIT: 55 DEGREES (SET IN 1949)
FLINT: 54 DEGREES (SET IN 1939)
SAGINAW: 54 DEGREES (SET IN 1939)
PREV DISCUSSION
ISSUED AT 1232 PM EST THU JAN 8 2026
AVIATION...
STRONG WARM ADVECTION PRECEDES THE ARRIVAL OF LOW PRESSURE TRACKING
INTO THE WESTERN GREAT LAKES LATE THIS EVENING, WITH A POWERFUL LOW-
LEVEL WIND FIELD PASSING THROUGH TONIGHT INTO FRIDAY. A DEGREE OF
STABILITY WILL BE MAINTAINED BELOW THE LOW-LEVEL INVERSION AT 2 TO 3
KFT, KEEPING THE HIGHER MAGNITUDE OF WIND ALOFT. HOWEVER, SOUTHERLY
WIND ATOP THIS LAYER INCREASES FROM 40-45 KT THIS AFTERNOON TO 50-60
KT OVERNIGHT. DESPITE SOME GUSTINESS REACHING THE BOUNDARY LAYER,
ELECTED TO INCLUDE LLWS MENTION IN THE TAF OVERNIGHT. SHOWERS
ASSOCIATED WITH THE LOW ARRIVE FROM THE SW LATE THIS EVENING AND
OVERNIGHT AHEAD OF THE COLD FRONT. THERE WILL BE A CHANCE FOR
THUNDER WITH THE INITIAL SHOWERS AROUND MIDNIGHT BUT LEFT TS OUT OF
TAF FOR NOW. MVFR CONDITIONS WILL GRADUALLY SPREAD EASTWARD DURING
THIS PERIOD WITH SOME POCKETS OF IFR POSSIBLE OVERNIGHT. THE COLD
FRONT THEN PASSES THROUGH THE REGION MIDDAY FRIDAY, ACCOMPANIED BY A
LINE OF SHOWERS AND A WIND SHIFT FROM S TO SW TO NW. GUSTS ARE
LIKELY TO NEAR OR EXCEED 30 KT THROUGH THE EARLY AFTERNOON,
ESPECIALLY ALONG THE FRONT.
FOR DTW... ARRIVAL OF RAIN SHOWERS IS ANTICIPATED BETWEEN 03Z AND
05Z TONIGHT WITH MVFR WORKING IN DURING THE EARLY MORNING HOURS.
RELATIVELY LOW CONFIDENCE EXISTS FOR IFR FRIDAY MORNING. CORE OF 50+
KT WIND ALOFT WILL BE CENTERED BETWEEN 03Z AND 12Z FRIDAY. SHIFT TO
SW (220 DEG) WIND DIRECTION AROUND 15Z THEN W (260 DEG) AROUND 18Z
BRINGS POTENTIAL TO EXCEED CROSSWIND THRESHOLDS.
DTW THRESHOLD PROBABILITIES...
* HIGH FOR CEILING AT OR BELOW 5000 FEET AFTER 03Z TONIGHT.
* LOW FOR THUNDERSTORMS LATE THIS EVENING.
* MODERATE FOR EXCEEDING CROSSWIND THRESHOLD BETWEEN 15Z AND 20Z
FRIDAY.
DTX WATCHES/WARNINGS/ADVISORIES
MI...NONE.
LAKE HURON...GALE WARNING FROM NOON TO 7 PM EST FRIDAY FOR LHZ361.
GALE WARNING FROM MIDNIGHT TONIGHT TO 7 PM EST FRIDAY FOR LHZ362-
363-462-463.
SMALL CRAFT ADVISORY FROM 8 PM THIS EVENING TO 7 PM EST FRIDAY FOR
LHZ421-441>443.
LAKE ST CLAIR...SMALL CRAFT ADVISORY FROM 10 PM THIS EVENING TO 7 PM EST FRIDAY FOR
LCZ460.
MICHIGAN WATERS OF LAKE ERIE...SMALL CRAFT ADVISORY FROM 10 PM THIS EVENING TO 7 PM EST FRIDAY FOR
LEZ444.
DISCUSSION...SC
MARINE.......AM
HYDROLOGY....SC
CLIMATE......SC
AVIATION.....TF
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