Area Forecast Discussion
Issued by NWS Grand Rapids, MI

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FXUS63 KGRR 280418
AFDGRR

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
1220 AM EDT THU MAY 28 2015

LATEST UPDATE...
AVIATION

.SYNOPSIS...
ISSUED AT 323 PM EDT WED MAY 27 2015

RAIN CHANCES WILL DIMINISH BEGINNING THIS EVENING. ANOTHER ROUND OF
SHOWERS AND THUNDERSTORMS IS EXPECTED FRIDAY INTO SATURDAY. THIS
WILL BE FOLLOWED BY DRIER AND MUCH COOLER CONDITIONS LASTING WELL
INTO THE COMING WEEK.

&&

.SHORT TERM...(THIS EVENING THROUGH SATURDAY)
ISSUED AT 323 PM EDT WED MAY 27 2015

THREAT FOR SEVERE THUNDERSTORMS HAS SHIFTED EAST OUT OF SOUTH
CENTRAL LOWER MICHIGAN. BEHIND THIS...PATCHES OF LIGHT RAIN WERE
MOVING EAST INTO THE AREA FROM LAKE MICHIGAN. FAR GREATER COVERAGE
OF RAIN IS NOTED OVER NORTHERN LOWER MICHIGAN...SO HAVE KEPT BEST
POPS OVER OUR NORTHERN ZONES INTO TONIGHT. EXPECT PATCHY FOG TO
DEVELOP AREAWIDE MAINLY AFTER MIDNIGHT.

AFTER A DRY THURSDAY...ATTENTION TURNS TO SHOWERS AND THUNDERSTORMS
FRIDAY INTO SATURDAY. THE PATTERN WILL BE CHARACTERIZED BY A FAIRLY
PROGRESSIVE UPPER TROUGH WITH CONFLUENT FLOW DOWNSTREAM. THIS IS NOT
A SYNOPTIC PATTERN CONDUCIVE TO SIGNIFICANT HEAVY RAIN. ALTHOUGH
DEEP LAYER FLOW PARALLELS THE ASSOCIATED COLD FRONT...THE SYSTEM
OVERALL SEEMS PROGRESSIVE ENOUGH TO MITIGATE THE FLOODING THREAT.
NONETHELESS...THIS WILL BE SOMETHING TO MONITOR. PLEASE REFERENCE
THE HYDROLOGY SECTION FOR FURTHER DETAILS.

.LONG TERM...(SATURDAY NIGHT THROUGH WEDNESDAY)
ISSUED AT 323 PM EDT WED MAY 27 2015

FAIRLY QUIET WEATHER IN THE EXTENDED. THE COLD FRONT PUSHES THROUGH
ON SATURDAY EVENING WITH SHOWERS ENDING FROM NORTH TO SOUTH. IT
SHOULD CLEAR OUT ACROSS THE NORTH BY MIDNIGHT AND TEMPERATURES ARE
EXPECTED TO DROP INTO THE 30S BY DAYBREAK SUNDAY...WITH FROST
FORMATION POSSIBLE ACROSS THE NORTHERN THIRD OF THE FORECAST AREA.
FROST IS ALSO POSSIBLE ACROSS THE NORTHERN ZONES ON MONDAY MORNING
AS COOL SFC HIGH HOLDS SWAY.

THE HIGH MOVES EAST ON TUESDAY WITH A RETURN FLOW SETTING UP ON
WEDNESDAY. SOME SHOWERS AND POSSIBLY THUNDER CAN BE EXPECTED ACROSS
THE SOUTHERN ZONES BY WEDNESDAY AFTERNOON IN AREA OF WEAK ISENTROPIC
ASCENT.

&&

.AVIATION...(FOR THE 06Z TAFS THROUGH 06Z FRIDAY)
ISSUED AT 1220 AM EDT THU MAY 28 2015

VFR CONDITIONS ARE ANTICIPATED THROUGH 06Z FRIDAY. A FEW SHOWERS AND
ISOLATED THUNDERSTORMS WELL TO THE NNW OF KMKG EARLY THIS MORNING
WILL DISSIPATE OVERNIGHT BEFORE REACHING KMKG. VFR CONDITIONS WILL
CONTINUE THROUGH THURSDAY WITH DEVELOPMENT OF SCT FAIR WX CUMULUS.

WE CANNOT RULE OUT POTENTIAL FOR AN ISOLATED SHOWER TO DEVELOP
THURSDAY AFTERNOON MAINLY NEAR TO NORTH OF KMKG. HOWEVER WITH A DRY
AIRMASS IN PLACE THERE IS NOT ENOUGH POTENTIAL FOR THIS TO OCCUR TO
WARRANT INCLUSION IN THE TERMINAL FCSTS. SKIES WILL CLEAR FRIDAY
EVENING WITH VFR CONDITIONS CONTINUING.

&&

.MARINE...
ISSUED AT 323 PM EDT WED MAY 27 2015

CANCELED THE MARINE FOG ADVISORY BASED ON WEBCAMS...ALTHOUGH PATCHY
FOG IS EXPECTED OVERNIGHT. WINDS AND WAVES ARE EXPECTED TO REMAIN
WELL BELOW ADVISORY THRESHOLDS THROUGH THURSDAY NIGHT...ALTHOUGH
WINDS WILL BEGIN TO PICK UP ON FRIDAY.


&&

.HYDROLOGY...
ISSUED AT 1246 PM EDT WED MAY 27 2015

RIVER LEVELS ARE LOW AND STABLE ACROSS THE AREA. HAD 1/2 TO 3/4
OF AN INCH OF PRECIPITATION WITH THIS MOST RECENT SYSTEM... AND
SOME SMALL UP TICS NOTED ON AREA RIVERS. EXPECTING NO FLOODING
THROUGH THE WEEK.

A POTENTIAL FOR MORE RAIN FRIDAY INTO SATURDAY (OVER AN INCH) MAY
PUSH SOME STREAMS AND RIVERS ABOVE BANKFULL BY NEXT WEEK... IF
THESE AMOUNTS ARE REALIZED.

&&

.GRR WATCHES/WARNINGS/ADVISORIES...
MI...NONE.
LM...NONE.
&&

$$

SYNOPSIS...TJT
SHORT TERM...TJT
LONG TERM...OSTUNO
AVIATION...LAURENS
HYDROLOGY...63
MARINE...TJT



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