Area Forecast Discussion
Issued by NWS Marquette, MI

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000
FXUS63 KMQT 021944
AFDMQT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MARQUETTE MI
344 PM EDT SUN AUG 2 2015

.SHORT TERM...(THIS EVENING THROUGH MONDAY)
ISSUED AT 343 PM EDT SUN AUG 2 2015

12Z RAOBS/LATEST WV IMAGERY AND RUC ANALYSIS SHOW STRONG SHRTWV
APRCHG THE UPR GREAT LKS IN DEEP CYC NW FLOW ARND CLOSED LO OVER FAR
NRN ONTARIO. THERE HAVE BEEN WAVES OF SHOWERS/ELEVATED TS THAT HAVE
MOVED THRU UPR MI AS DPVA/DEEP LYR QVECTOR CNVGC AHEAD OF THE SHRTWV
HAS LIFTED UNSTABLE ENVIRONMENT SHOWN ON THE 12Z AND 18Z GRB RAOBS
/H7-5 LAPSE RATES AOA 8C/KM/. MOST OF THE TS HAVE IMPACTED LOCATIONS
NEAR THE WI BORDER WHERE RUC ANALYSIS MUCAPES HAVE BEEN UP TO 1000
J/KG UNDER AXIS OF HIER H85 THETA E. ALTHOUGH SOME OF THE STORMS
EARLIER THIS MRNG WERE SEVERE WITH LARGE HAIL...LOTS OF CLD COVER
OVER UPR MI HAVE MAINTAINED MORE ELEVATED CORES HAVE LIMITED THE
SEVERITY OF THE CONVECTION MOST OF THE DAY DESPITE IMPRESSIVE DEEP
LYR SHEAR ON THE ORDER OF 40-50 KTS UNDER RIBBON OF STRONG WNW WINDS
ALOFT. THE SHOWERS ARE TENDING TO DIMINISH OVER THE NW CWA WITH
ARRIVAL OF NEGATIVE H85 THETA E ADVECTION/MID-LVL DRYING/DEEP LYR
QVECTOR DVGC AND MORE MARGINAL LAPSE RATES DEPICTED ON THE 12Z INL
RAOB.

LATE THIS AFTN...WHILE MORE NMRS SHOWERS/TS MAY IMPACT THE SE
CWA...THE ARRIVAL OF MORE MARGINAL LAPSE RATES ACCOMPANYING DEEP LYR
QVECTOR CNVGC WL LIMIT THE COVERAGE/INTENSITY OF THIS CONVECTION.

TNGT...AFTER ANY LINGERING SHOWERS/TS OVER THE SE CWA END AFTER
EARLY EVNG...LARGER SCALE SUBSIDENCE/DRYING IN THE WAKE OF PASSING
SHRTWV WL BRING A CLEARING TREND. AS UPR TROF AMPLIFIES INTO THE UPR
LKS...LLVL SLGTLY CYC NW FLOW BEHIND COLD FROPA IS FCST TO DROP H85
TEMPS AS LO AS 6 TO 7C BY 12Z MON. WITH THIS THERMAL TROF...EXPECT
INCRSG LO CLDS LATE...ESPECIALLY OVER THE HIER TERRAIN OF THE NW
CWA.

MON...CYC H85 NW FLOW IS PROGGED TO PERSIST AND MAINTAIN THERMAL
TROF OVER THE CWA...SO EXPECT A GOOD DEAL OF CLD COVER. COMBINATION
OF DATYIME HEATING AND PASSING SHRTWV MAY BRING SOME SCT SHOWERS...
MAINLY OVER THE INTERIOR AWAY FM LK SUP MODERATION IN THE AFTN. WITH
H85 TEMPS FCST IN THE 8 TO 10C RANGE...EXPECT MAX TEMPS MAINLY IN
THE 60S...EXCEPT 70 TO 75 IN THE DOWNSLOPE AREAS OF THE SCENTRAL.

.LONG TERM...(MONDAY NIGHT THROUGH SUNDAY)
ISSUED AT 344 PM EDT SUN AUG 2 2015

SPENT A CONSIDERABLE AMOUNT OF TIME WORKING SHORT FUSE OPERATIONS
TODAY GIVEN IMPACTS IN THE SHORT TERM AND LACK OF SIGNIFICANT
IMPACTS IN THE LONG TERM. ADDITIONALLY...CONSENSUS GUIDANCE HAS A
GOOD HANDLE ON THE LONG TERM SITUATION SO TIME WAS BEST SPENT
HELPING IN THE SHORT TERM.

BASIC IDEA IS THAT WITH AN UPPER LOW MOVES NE OF THE CWA MON NIGHT
INTO TUE...COULD SEE SHOWERS AND MAYBE T-STORMS DUE TO DECREASED MID-
UPPER LEVEL TEMPS AND SHORTWAVE ENERGY ROTATING THROUGH. BEST
COVERAGE SHOULD BE DURING THE DAY ON TUE WITH GREATEST SFC HEATING.

WED LOOKS DRY WITH A SFC RIDGE OVERHEAD. THU THROUGH FRI MAY BE DRY
AS WELL...BUT REGIONAL CONDITIONS WILL BE MORE IMPACTED BY AN
INCREASE IN SHORTWAVE ACTIVITY AND A RESULTING INCREASE IN
UNCERTAINTY. SHOULD SEE BETTER CHANCES FOR PRECIP NEXT WEEKEND...BUT
THAT IS QUITE UNCERTAIN AS WELL. OVERALL...LEANED HEAVILY ON
CONSENSUS GUIDANCE FOR MOST OF THE LONG TERM.
&&

.AVIATION...(FOR THE 18Z TAFS THROUGH 18Z MONDAY AFTERNOON)
ISSUED AT 156 PM EDT SUN AUG 2 2015

SOME SHRA AND PERHAPS A TS IN ADVANCE OF AN APRCHG COLD FNT WL
IMPACT MAINLY SAW THRU THIS AFTN. ALTHOUGH SOME LOWER CIGS/VSBYS
COULD ACCOMPANY THE HEAVIER SHOWERS...VFR CONDITIONS SHUD
PREDOMINATE. FOLLOWING THE COLD FROPA/WSHFT TO THE NW AND ARRIVAL OF
DRIER LLVL AIR THIS AFTN...THE SHRA THREAT WL END...AND SKIES WL
TURN PCLDY. MORE LOWER CLDS WL ARRIVE AS EARLY AS LATE TNGT OVER THE
KEWEENAW AND THEN EXPAND TO IWD/SAW WITH INCRSG LLVL MSTR. ALTHOUGH
THERE COULD A -SHRA...VFR CONDITIONS WL BE THE RULE WITH A WELL
MIXED/DRY NEAR SFC LYR. BEST CHC FOR A LOWER MVFR CIG WOULD BE AT
CMX WITH FVRBL UPSLOPE WIND COMPONENT.
&&

.MARINE...(FOR THE 4 PM LAKE SUPERIOR FORECAST ISSUANCE)
ISSUED AT 343 PM EDT SUN AUG 2 2015

EXPECT WNW WINDS UP TO 20 KTS INTO MID WEEK AROUND DEEP LO PRES NEAR
HUDSON BAY. THE ARRIVAL OF A HI PRES RIDGE LATER IN THE WEEK WILL
RESULT IN LIGHT WINDS UNDER 15 KTS.
&&

.MQT WATCHES/WARNINGS/ADVISORIES...
UPPER MICHIGAN...
NONE.
LAKE SUPERIOR...
NONE.
LAKE MICHIGAN...
NONE.
&&

$$

SHORT TERM...KC
LONG TERM...TITUS
AVIATION...KC
MARINE...KC


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