Area Forecast Discussion
Issued by NWS Detroit/Pontiac, MI

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000
FXUS63 KDTX 300945
AFDDTX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
545 AM EDT SUN AUG 30 2015

.AVIATION...

LINGERING LOW LEVEL MOISTURE WITH DRY AIR IN THE MID LEVELS
ATTEMPTING TO MOVE INTO SOUTHEAST MICHIGAN TODAY. ISOLATED-SCATTERED
LIGHT SHOWERS STILL AROUND...WITH A REMOTE CHANCE OF A THUNDERSTORM.
FORECAST CEILINGS WILL HINGE ON THE EXTENT OF LOWER CLOUDS AND FOG
DEVELOPING NEAR SUNRISE. WHATEVER IFR FOG AND STRATUS AROUND WILL
GRADUALLY LIFT INTO LOW VFR DECK BY EARLY AFTERNOON...AND LIKELY
LINGERING MOST OF THE DAY. CLEARING SKIES DURING THE EVENING HOURS
EXPECTED TO YIELD FOG AGAIN LATE TONIGHT...BUT SHOULD BE
SHALLOWER...AND HAVE GONE WITH 3SM FOR NOW.

FOR DTW...SHOULD HAVE MVFR FOG TO START THE DAY...BUT HAVE BACKED
OFF ON THE IFR CEILING. CEILINGS AROUND OR JUST BELOW 5000 FEET
EXPECTED THROUGH THE DAY...BUT CLEARING DURING EARLY EVENING HOURS.

//DTW THRESHOLD PROBABILITIES...

* HIGH FOR CIG AOB 5KFT TODAY.

&&

.PREV DISCUSSION...ISSUED 302 AM EDT SUN AUG 30 2015

SHORT TERM... TODAY AND TONIGHT

MOIST AIRMASS IN PLACE OVER SOUTHEAST MICHIGAN EARLY THIS
MORNING...AS 00Z DTX SOUNDING REVEALED A 700 MB DEW PT OF 4
C...850 MB DEW PT OF 12 C...ALONG WITH A PW VALUE OF 1.6 INCHES.

SHEARED OUT SHORTWAVE/PV WILL SLOWLY BE EXITING THE CENTRAL GREAT
LAKES...BUT LAST VESTIGE OF 850-700 MB THETA-E AXIS STILL PROVE
SUFFICIENT FOR ISOLATED-SCATTERED LIGHT SHOWERS THIS MORNING BEFORE
DRIER AIR ATTEMPTS TO SLOWLY FILTER INTO SOUTHERN LOWER MICHIGAN
THROUGH THE DAY...BUT UNCERTAIN WE WILL BE ABLE TO SCOUR OUT THE LOW
LEVEL MOISTURE...AS 00Z NAM MAINTAINS HIGHER RH VALUES IN THE 925-
850 MB LAYER. WITH 500 MB TEMPS FALLING UP TO 2 C DEGREES...SURFACE
BASED INSTABILITY/CAPE IS PROGGED TO RISE TO AROUND 750 J/G...PER
00Z GFS...BUT 1000-2000 J/KG PER 00Z NAM...AS SURFACE DEW PTS REMAIN
SOLIDLY IN THE 60S. HOWEVER...700 MB TEMPS WILL BE RISING TO AROUND
9 C NORTH OF I-69...WHICH SHOULD ULTIMATELY PROVIDE A SUFFICIENT
CAP. SOUTH OF I-69 IS WHERE COOLER MID LEVELS PERSIST LONGER AND
WHERE A SLIGHT/LOW CHANCE OF SHOWERS/THUNDERSTORMS WILL BE CARRIED
FOR THE AFTERNOON HOURS. MINIMAL CONCERNS FOR SEVERE WEATHER WITH
WEAK WIND FIELDS...IF IN FACT A CELL IS EVEN ABLE TO GO UP.

BASED ON PESKY CLOUDS EXPECTED TODAY...WILL HOLD MAXES AROUND 80
DEGREES...BUT POTENTIAL FOR WARMER TEMPS IS THERE WITH 850 MB TEMPS
OF 16 C. LOW LEVEL MOISTURE/ELEVATED DEW PTS HOLDING IN THE LOWER
60S TONIGHT SHOULD SET THE STAGE FOR SOME FOG AS SKIES BECOME MAINLY
CLEAR WITH LIGHT/CALM WINDS IN PLACE.

LONG TERM...MONDAY THROUGH SATURDAY

SOUTHERN PLAINS UPPER RIDGE WILL UNDERGO STEADY DOWNSTREAM
AMPLIFICATION OVER THE NEXT 48 HOURS...IN RESPONSE TO SUBSTANTIAL
HEIGHT FALLS WORKING INTO THE WESTERN CONUS.  THIS PROCESS WILL
EFFECTIVELY CENTER AN UPPER LEVEL ANTICYCLONE OVER SE MICHIGAN BY
MONDAY.  A HIGH DEGREE OF STABILITY UNDER THE ATTENDANT MINIMUM IN
THETA-E AND AN ELEVATED MID LEVEL TEMPERATURE PROFILE WILL YIELD
PLENTY OF SUNSHINE...AND NO REAL OPPORTUNITY FOR CONVECTIVE
DEVELOPMENT.  THE INCREASE IN THICKNESSES AND GENERALLY LIGHT
SOUTHWEST FLOW WILL PROVIDE A NOTED UPTICK IN TEMPERATURES RELATIVE
TO TODAY...WITH DAYTIME READINGS REACHING THE MID 80S.

UPPER RIDGING TO REMAIN THE PRIMARY GOVERNING FEATURE THROUGH THE
REMAINDER OF THE UPCOMING WORK WEEK.  THIS WILL TRANSLATE INTO A
RELATIVELY BENIGN STRETCH OF WEATHER CONDITIONS...WITH ABOVE NORMAL
WARMTH AND LIMITED /IF ANY/ POTENTIAL FOR CONVECTION.  THE RIDGE
AXIS MAY LOSE SOME DEFINITION BY MIDWEEK AS A WEAK HEIGHT FALL
CENTER DRIFTS THROUGH THE OHIO VALLEY...WITH A CORRESPONDING GRADUAL
INCREASE IN THETA-E DURING THIS TIME.  PLAUSIBLE SCENARIO THAT WEAK
CVA WORKING THROUGH ALONG THE NORTH END OF THIS FEATURE PROVIDES A
LOCALIZED/BRIEF WINDOW FOR ASCENT...MEDIUM RANGE GUIDANCE STILL
CENTERING ON WEDNESDAY.  LOW END POTENTIAL AT THIS STAGE GIVEN AN
OTHERWISE LACKLUSTER LOOKING FORCING/WIND FIELD.

MARINE...

BENIGN MARINE WEATHER WILL CONTINUE ACROSS THE GREAT LAKES REGION
THROUGH MUCH OF THE UPCOMING WEEK. A STRONG RIDGE OF UPPER LEVEL
HIGH PRESSURE WILL MAINTAIN LIGHT FLOW AND A GENERAL SOUTHWEST WIND
DIRECTION.

&&

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

$$

AVIATION.....SF
SHORT TERM...SF
LONG TERM....MR
MARINE.......MR


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