Area Forecast Discussion
Issued by NWS Detroit/Pontiac, MI

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FXUS63 KDTX 282324
AFDDTX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
724 PM EDT SUN JUN 28 2015


.AVIATION...

MINIMAL CONCERNS TONIGHT WITH DIURNAL CU CONTINUING TO DIMINISH
WHILE HIGH CLOUDS AOA 15KFT INCREASE FROM THE WEST. DESPITE
DECREASING WINDS...FOG NOT EXPECTED DUE TO FAIRLY DRY LOW LEVELS AND
SOME DEGREE OF HIGH CLOUDINESS.

LOW PRESSURE TRACKING THROUGH INDIANA AND NORTHWEST OHIO MONDAY WILL
RESULT IN LOWERING CLOUD BASES OVER THE TERMINAL CORRIDOR AS WELL AS
THE POTENTIAL FOR AFTERNOON SHOWERS. THERE IS STILL UNCERTAINTY WITH
SHOWER COVERAGE BUT THE BEST POTENTIAL EXISTS ACROSS THE I-94
TERMINALS SO SHRA MENTION WAS MAINTAINED THERE. EXPECT RAIN TO FALL
INITIALLY FROM VFR CLOUDS BUT LOWERING INTO MVFR INTO THE EVENING
FOR AT LEAST THE I-94 TERMINALS. ISOLATED AFTERNOON TS CANNOT BE
RULED OUT BUT POTENTIAL IS TOO LOW TO INCLUDE AT THIS TIME.

FOR DTW...CLOUD BASES WILL LOWER TO AOB 5KFT MONDAY AFTERNOON WITH
THE POTENTIAL FOR SHOWERS. CLOUD BASES ARE EXPECTED TO CONTINUE TO
LOWER IN THE EVENING HOURS INTO THE MVFR RANGE. AN ISOLATED
THUNDERSTORM IS POSSIBLE AS WELL BUT NOT ENOUGH CONFIDENCE TO
INCLUDE IN THE TAFS.

//DTW THRESHOLD PROBABILITIES...

* HIGH IN CIGS AOB 5KFT AFTER 17Z MONDAY.

* LOW TO MEDIUM CONFIDENCE IN THUNDERSTORMS MONDAY AFTERNOON.

&&

.PREV DISCUSSION...ISSUED 309 PM EDT SUN JUN 28 2015

SHORT TERM...LATE THIS AFTERNOON AND TONIGHT

IT LOOKS TO BE MOSTLY CLEAR TO PARTLY CLOUDY TONIGHT AS SOUTHEAST
MICHIGAN WILL BE CAUGHT IN BETWEEN TWO STORM SYSTEMS. THE LARGER ONE
CENTERED ALONG THE SOUTHERN ONTARIO/QUEBEC BORDER...WITH THE SECOND
UPPER WAVE OVER THE MIDWEST DIVING INTO THE WESTERN OHIO VALLEY
TONIGHT. TRAILING UPPER LEVEL PV TAIL WORKING THROUGH EASTERN LOWER
MICHIGAN THIS AFTERNOON...AND THERE REMAINS A CHANCE FOR ISOLATED
SHOWERS AS MID LEVELS (700-500 MB) ARE RELATIVELY COOL...AND LAPS
DATA INDICATED AT LEAST A COUPLE HUNDREDS OF CAPE. HOWEVER...SURFACE
DEW PTS CONTINUE TO FALL ACROSS NORTHERN LOWER MICHIGAN INTO THE
40S...AND THERE HAS BEEN NO DEVELOPMENT (THROUGH 3 PM) OUTSIDE OF
MODERATE CU FIELD WEST/NORTHWEST OF SAGINAW. STILL...THIS IS THE
MIDDLE OF SUMMER AND CAN`T GIVE UP UNTIL VERY LATE IN THE DAY...AND
WITH MANY OF THE 12Z MODELS STILL SUGGESTING A FEW SHOWERS...WILL
CARRY ISOLATED MENTION FOR TRI-CITES DOWN TO AROUND FLINT AS MARINE
PUSH OFF SAGINAW BAY WITH WATER TEMPS IN THE UPPER 60S TO NEAR 70
DEGREES POSSIBLY HELPS CONTRIBUTE SOME MOISTURE OR AT THE VERY LEAST
BOOSTING LOW LEVEL CONVERGENCE.

BASED OFF DEW PTS AND WINDS GOING VERY LIGHT/CALM...GUIDANCE TEMPS
IN THE 50S APPEARS FINE...WITH NORMALLY COLDER THUMB REGION CLOSER
TO 50 DEGREES. ENOUGH DRYING HAS OCCURRED THIS AFTERNOON TO LIMIT
FOG POTENTIAL...OUTSIDE THE USUAL SUSPECTS/MICRO-CLIMATES.

LONG TERM...MONDAY THROUGH NEXT SUNDAY

COMPOSITE PV ANOMALY STRUCTURE OVER THE MID-MISSISSIPPI VALLEY IS
ATTEMPTING TO CONSOLIDATE WITH THE AID OF DIABATICS. DEFORMATION
ALONG THE COLD FLANK HAS BEEN RESPONSIBLE FOR SOME MODEST CONVECTIVE
DEVELOPMENT OVER CENTRAL WISCONSIN. NEAR THE WAVE CENTROID...
CONVECTION IS BEING FORCED OVER EASTERN IOWA INTO CENTRAL ILLINOIS.
THIS ACTIVITY SHOULD CONTINUE TO ORGANIZE THROUGH THE EVENING HOURS
AS THE WAVE PIVOTS CYCLONICALLY IN THE LONG WAVE TROUGH STRUCTURE.

28.12Z NWP SUITE OFFERING THE FULL SPECTRA OF POSSIBLE OUTCOMES IN
SPITE TIME GETTING SHORT. THE NAM AND GEM REGIONAL BOTH PRESENT A
VERY BULLISH RESULT FOR FAR SOUTHEAST MICHIGAN WITH DEFORMATION
FORCED CONVECTION AND APPRECIABLE PRECIPITATION. WATER VAPOR IMAGERY
DOES NOT SEEM TO SUPPORT THE OVERALL STRUCTURE DISPLAYED IN THESE
TWO SOLUTIONS. THE GFS AND LATEST ECMWF BOTH KEEP THE BEST FORCING
AND INSTABILITY SOUTH OF LOWER MICHIGAN. EXPECT SOME SHOWER AND
LIMITED THUNDERSTORM ACTIVITY TO AFFECT THE FAR SOUTH. STILL
PRESENTED SOME MODEST CHANCES FARTHER NORTH...WHERE BROAD
DEFORMATION COULD COLLECT SOME MOISTURE AND INITIATE SOME SHOWER
ACTIVITY.  SUFFICE IT TO SAY...PRECIP CHANCES ARE RECEDING QUICKLY
AS DETAILS REGARDING THE SYSTEM STRUCTURE CONTINUE TO EMERGE.

THE SAME IS TRUE FOR THE NEXT WAVE EXPECTED TO INFLUENCE THE REGION
ON TUESDAY - MOST OF THE MOISTURE CONVERGENCE WILL REMAIN ON THE
PERIPHERY OF THE REGION...WHERE BETTER MOISTURE AND INSTABILITY WILL
BE PRESENT. THE PRESENCE OF A SURFACE LOW DURING THE DIURNAL CYCLE
DOES COMMAND A LITTLE RESPECT FOR SOME SCATTERED SHOWER
DEVELOPMENT...BUT ONLY A LITTLE RESPECT.

WEDNESDAY INTO NEXT WEEKEND...MEAN UPPER TROUGHINESS LOOKS TO
CONTINUE OVER THE GREAT LAKES BETWEEN RATHER STAGNANT RIDGING OVER
THE DESERT SOUTHWEST AND THE CENTRAL ATLANTIC. WITH SHORTWAVES
ROTATING THROUGH AND THE UPPER COOL POOL IN THE VICINITY...CHANCE
POPS ARE WARRANTED FOR MUCH OF THIS TIME FRAME SAVE FOR THURSDAY
WHEN INDICATIONS ARE THAT BRIEF SHORTWAVE RIDGING WILL TAKE PLACE.
PREDICTABILITY NOT HIGH YET FOR THE 4TH WITH 12Z GFS DEVELOPING A
CUTOFF LOW OVER THE LOCAL AREA WHILE ECMWF PUSHES A WAVE THROUGH
EARLIER LEADING TO A DRY PROJECTION.

MARINE...

BRIEF RESPITE FROM GUSTY WIND CONDITIONS TONIGHT AND EARLY MONDAY.
THE NEXT STORM SYSTEM WILL SET THE STAGE FOR AN INCREASE IN SURFACE
FLOW MONDAY EVENING. ON LAKE ERIE THE INITIAL INCREASE IN WINDS WILL
BE EASTERLY FLOW ON MONDAY AFTERNOON TRANSITIONING TO WESTERLY AS
THE SURFACE LOW TRAVERSES THE LAKE. LAKE HURON WILL EXPERIENCE
SLIGHLY WEAKER FLOW WITH THE OPPOSITE ATTITUDE WITH NORTHEASTERLY
BACKING TO NORTHERLY. THE STRONGEST FLOW APPEARS RESTRICTED TO LAKE
ERIE WITH THE EASTERLY FLOW EPISODE.

&&

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

$$

AVIATION.....DT
SHORT TERM...SF
LONG TERM....MANN/DT
MARINE.......MANN


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