Area Forecast Discussion
Issued by NWS Grand Rapids, MI

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000
FXUS63 KGRR 131132
AFDGRR

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
732 AM EDT SAT SEP 13 2014

LATEST UPDATE...
AVIATION

.SYNOPSIS...
ISSUED AT 318 AM EDT SAT SEP 13 2014

SHOWERS WILL END TODAY AS LOW PRESSURE MOVES AWAY. SKIES WILL
CLEAR TONIGHT AND SOME FROST IS EXPECTED NORTH OF INTERSTATE 96.
FAIR WEATHER IS EXPECTED SUNDAY THEN A COLD FRONT WILL BRING SOME
LIGHT RAIN FOR MONDAY.

&&

.SHORT TERM...(TODAY THROUGH MONDAY)
ISSUED AT 318 AM EDT SAT SEP 13 2014

THE STEADY RAIN WILL BE EXITING TO THE EAST THIS MORNING BUT LAKE
EFFECT SHOWERS WILL PERSIST THIS MORNING BEFORE HEIGHT RISES
BRING ENOUGH SUBSIDENCE TO SUPPRESS THEM. SFC HIGH BUILDS IN THIS
AFTERNOON WITH CLEARING EXPECTED BY EVENING. WE STILL EXPECT
PATCHY FROST NORTH OF INTERSTATE 96 BY SUNDAY MORNING WITH
TEMPERATURES DROPPING TO FREEZING IN SOME OF THE COLD HOLLOWS.

SFC HIGH MOVES EAST SUNDAY WITH A COLD FRONT SAGGING INTO NORTHERN
LOWER MICHIGAN SUNDAY NIGHT AS FLAT UPPER TROUGHING ARRIVES. SOME
SHOWERS ALONG THE FRONT WILL AFFECT THE NORTHWEST ZONES BY LATE
SUNDAY NIGHT...BUT THE BULK OF THE SHOWERS WILL MOVE THROUGH ON
MONDAY WITH THE SFC FROPA AND UPPER SHORTWAVE TROUGH AXIS MOVING
THROUGH.

.LONG TERM...(MONDAY NIGHT THROUGH FRIDAY)
ISSUED AT 318 AM EDT SAT SEP 13 2014

EXCEPT FOR A RESIDUAL THREAT OF RAIN THE FIRST PART OF MON NIGHT
RIGHT AT THE BEGINNING OF THE LONG TERM...IT LOOKS LIKE WE WILL SEE
A FAIRLY QUIET AND MILD PERIOD IN GENERAL. THIS WILL BE A CHANGE
FROM THE WET AND UNSETTLED PATTERN WE HAVE BEEN IN FOR THE LAST
COUPLE OF WEEKS.

THE CHANCE OF RAIN MON EVENING WILL BE RATHER SMALL...AND THE THREAT
SHOULD END BY THE SECOND HALF OF MON NIGHT. THE COLD FRONT WILL BE
SOUTH OF THE AREA BY THE BEGINNING OF THE LONG TERM. WE WILL SEE THE
UPPER SHORT WAVE PASS THROUGH THE AREA BY 06Z TUE...WHICH WILL KEEP
A LOW THREAT OF A FEW LIGHT RAIN SHOWERS IN UNTIL ITS PASSAGE.

THE REMAINDER OF THE WEEK THEN LOOKS TO BE RATHER QUIET AND MILD.
THE UPPER JET WILL REMAIN NORTH OF THE AREA THROUGH THE PERIOD WITH
A NW FLOW IN PLACE OVER THE STATE. THIS WILL KEEP SHORT WAVES OUT OF
THE AREA AND THE COOL AIR FROM THIS WEEK UP IN CANADA. A FAIRLY
STRONG SHORT WAVE DOES TRY TO DIG FURTHER SOUTH TOWARD THE AREA IN
THE THU TIME FRAME. THIS WILL PUSH A MOISTURE-STARVED COLD FRONT
INTO THE AREA. PCPN DOES NOT LOOK LIKELY AT THIS TIME WITH IT. IT
DOES LOOK LIKE THAT IT WILL STOP THE MODERATING TREND THAT IS
ONGOING DURING THE FIRST HALF OF THE WEEK.

&&

.AVIATION...(FOR THE 12Z TAFS THROUGH 12Z SUNDAY MORNING)
ISSUED AT 732 AM EDT SAT SEP 13 2014

PATCHY IFR CEILINGS EARLY THIS MORNING BUT CONDITIONS WILL TREND
TO MVFR BY 18Z WITH GENERALLY VFR EPXECTED THROUGH THE AFTERNOON.
WINDS WILL BE NORTHWEST AROUND 10 TO 20 MPH.

&&

.MARINE...
ISSUED AT 318 AM EDT SAT SEP 13 2014

ISOLATED WATERSPOUTS ARE POSSIBLE THIS MORNING AS CONDITIONS FAVOR
SOME DEEP UPDRAFTS AND RADAR SHOWS A BAND OF CONVECTIVE LOOKING
SHOWERS OVER THE LAKE.

A SMALL CRAFT ADVISORY IS IN EFFECT SOUTH OF HOLLAND THROUGH THIS
AFTERNOON AS NORTHWEST WINDS WILL KICK UP WAVES GREATER THAN 4
FEET TODAY. HIGH PRESSURE MOVING OVER TONIGHT WILL SEE WINDS AND
WAVES RAPIDLY DECREASING.


&&

.HYDROLOGY...
ISSUED AT 318 AM EDT SAT SEP 13 2014

NO HYDRO ISSUES.

&&

.GRR WATCHES/WARNINGS/ADVISORIES...
MI...NONE.
LM...SMALL CRAFT ADVISORY UNTIL 5 PM EDT THIS AFTERNOON FOR LMZ844-
     845.

&&

$$

SYNOPSIS...OSTUNO
SHORT TERM...OSTUNO
LONG TERM...NJJ
AVIATION...OSTUNO
HYDROLOGY...OSTUNO
MARINE...OSTUNO






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