Area Forecast Discussion
Issued by NWS Grand Rapids, MI

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000
FXUS63 KGRR 251928
AFDGRR

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
328 PM EDT MON AUG 25 2014

LATEST UPDATE...
SYNOPSIS/SHORT TERM/LONG TERM/HYDRO/MARINE

.SYNOPSIS...
ISSUED AT 328 PM EDT MON AUG 25 2014

SHOWERS AND THUNDERSTORM CAN BE EXPECTED ACROSS SOUTHERN LOWER
MICHIGAN TONIGHT THROUGH TUESDAY. AFTER ANOTHER HUMID DAY ON
TUESDAY...DRIER AIR WILL BE MOVING IN FOR WEDNESDAY.

&&

.SHORT TERM...(THIS EVENING THROUGH WEDNESDAY NIGHT)
ISSUED AT 328 PM EDT MON AUG 25 2014

A LINE OF THUNDERSTORMS WILL BE AFFECTING AREAS SOUTH OF
INTERSTATE 96 THIS EVENING. SOME OF THE STORMS WILL CONTAIN HEAVY
RAIN AND A FEW COULD HAVE HIGH WINDS AND HAIL. THE SHOWERS AND
THUNDERSTORMS WILL DIMINISH OVERNIGHT AS INSTABILITY
DECREASES...THEN RAMP UP AGAIN ON TUESDAY WITH THE SFC FRONT
SLOWLY MOVING SOUTH. EXPECT DRYING FROM NORTH TO SOUTH LATE
TUESDAY AND TUESDAY NIGHT WITH A PUSH OF COOLER AND MUCH LESS
HUMID AIR ARRIVING BY WEDNESDAY.

.LONG TERM...(THURSDAY THROUGH MONDAY)
ISSUED AT 320 PM EDT MON AUG 25 2014

HIGH PRESSURE OVER THE GREAT LAKES WILL QUICKLY GIVE WAY TO LOW
PRESSURE MOVING EAST FROM THE PLAINS. THURSDAY LOOKS MAINLY DRY WITH
THE HIGH STILL IN CONTROL. HOWEVER THURSDAY NIGHT THROUGH SUNDAY
LOOKS TO BE RATHER WET AS THE LOW MOVES EAST ACROSS NORTHERN LOWER
MICHIGAN AND THE TRAILING COLD FRONT BECOMING SOMEWHAT HUNG UP OVER
THE CENTRAL CWA FRIDAY AS A TRAILING LOW RIDES NORTHEAST ALONG THE
BOUNDARY. THE GFS IS QUITE A BIT QUICKER THAN THE ECMWF AND WOULD
MOVE THE COLD FRONT EAST QUICKER RESULTING IN A DRY SUNDAY. THE
ECMWF ON THE OTHER HAND IS QUITE A BIT SLOWER AND LINGERS PCPN INTO
MONDAY. HIGHS 75-80 ARE EXPECTED THROUGH THE PERIOD.

&&

.AVIATION...(FOR THE 18Z TAFS THROUGH 18Z TUESDAY AFTERNOON)
ISSUED AT 139 PM EDT MON AUG 25 2014

A STORMY AFTERNOON IS EXPECTED AS A BROKEN LINE OF TSRA SLOWLY
DROPS SOUTHEAST ACROSS THE TAF SITES. GIVEN THE HIGH MOISTURE
CONTENT OF THE STORMS...HEAVY RAIN WILL LIMIT VSBYS TO 2SM. IT`S
POSSIBLE VSBYS COULD FALL TO A MILE. PCPN WILL DIMINISH THIS
AFTERNOON BUT POTENTIALLY REDEVELOP TUESDAY MORNING AS A COLD
FRONT MOVES THROUGH.

MVFR FOG WILL LIKELY DEVELOP AFTER 06Z.

&&

.MARINE...
ISSUED AT 328 PM EDT MON AUG 25 2014

WIND AND WAVES WILL BE RELATIVELY LIGHT TONIGHT THROUGH WEDNESDAY
NIGHT EXCEPT FOR AREAS SOUTH OF MUSKEGON WHERE THEY MAY BE LOCALLY
HIGHER IN THUNDERSTORMS. FOG MAY REDUCE VISIBILITY BELOW A MILE
TONIGHT.

&&

.HYDROLOGY...
ISSUED AT 328 PM EDT MON AUG 25 2014

HEAVY RAIN MAY CAUSE LOCALIZED FLOODING TONIGHT AND TUESDAY SOUTH
OF INTERSTATE 96.

&&

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

$$

SYNOPSIS...OSTUNO
SHORT TERM...OSTUNO
LONG TERM...93
AVIATION...93
HYDROLOGY...OSTUNO
MARINE...OSTUNO





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