Area Forecast Discussion
Issued by NWS Grand Rapids, MI

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary Off
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

971
FXUS63 KGRR 050712
AFDGRR

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
312 AM EDT THU MAY 5 2016

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

.SYNOPSIS...
ISSUED AT 312 AM EDT THU MAY 5 2016

HIGH PRESSURE WILL BUILD IN ACROSS THE AREA THROUGH THE DAY TODAY.
SOME CLOUDS WILL BE LIKELY THIS AFTERNOON AWAY FROM LAKE MICHIGAN...
WITH EVEN A SPRINKLE POSSIBLE. TEMPERATURES WILL RECOVER INTO THE
60S. FRIDAY LOOKS LIKE A VERY NICE DAY WITH A GOOD DEAL OF SUNSHINE
AND HIGHS AROUND 70.

A COLD FRONT WILL PUSH THROUGH THE AREA MAINLY ON SATURDAY MORNING.
THIS WILL BRING A CHANCE OF A FEW SHOWERS AND EVEN A STORM. SKIES
WILL CLEAR OUT SATURDAY AFTERNOON AND SATURDAY NIGHT. THERE WILL BE
OCCASIONAL CHANCES OF RAIN NEXT WEEK WITH MULTIPLE SYSTEMS EXPECTED
TO IMPACT THE AREA.

&&

.SHORT TERM...(TODAY THROUGH SATURDAY)
ISSUED AT 312 AM EDT THU MAY 5 2016

THE MAIN ITEM OF INTEREST IN THE SHORT TERM PORTION OF THE FCST WILL
BE THE COLD FRONT SLIDING THROUGH THE AREA ON SAT MORNING.
OTHERWISE...THE WEATHER WILL BE RATHER QUIET WITH MORE SEASONABLE
TEMPERATURES EXPECTED AFTER THE COLD AND DAMP DAY THE AREA HAD ON
WEDNESDAY.

LOW CLOUDS THAT HAVE SETTLED IN THIS MORNING IN THE WAKE OF THE
UPPER LOW SHOULD DIMINISH THIS MORNING. WE DO EXPECT DIURNAL CU TO
BE RATHER EXPANSIVE THIS AFTERNOON AWAY FROM LAKE MICHIGAN AS THE
UPPER FLOW REMAINS SOMEWHAT CYCLONIC EARLY ON. VERTICAL EXTENT OF
THE CU WILL BE LIMITED...BUT COULD BE JUST ENOUGH TO PRODUCE A
SPRINKLE OR TWO THIS AFTERNOON.

WE WILL SEE SKIES CLEAR OUT THIS EVENING...AND REMAIN MOSTLY CLEAR
THROUGH FRIDAY EVENING. WE WILL SEE UPPER RIDGING FINALLY MOVE IN
AND PROVIDE PLENTY OF SUBSIDENCE OVERHEAD. LOW LEVEL TEMPS WILL
MODERATE ALSO...WITH H850 TEMPS INCREASING TO AROUND 10C LATE IN THE
DAY. THIS WILL SUPPORT MAX SFC TEMPS UP AROUND 70 FOR MOST INLAND
AREAS.

WE WILL SEE ANOTHER SHOT OF SHOWERS AND A STORM MOVE IN OVERNIGHT
FRIDAY NIGHT AND SATURDAY MORNING. NW FLOW ALOFT WILL REMAIN...AND A
SHORT WAVE WILL DIVE SE TOWARD THE NRN PORTION OF THE STATE. THIS
WILL PUSH A SFC FRONT THROUGH BEGINNING AFTER 06Z SAT AND SHOULD
EXIT THE AREA BY 18Z SAT. THERE ARE ENOUGH DYNAMICS WITH THIS WAVE
AND SUFFICIENT MOISTURE THAT MOST AREAS WILL SEE SOME RAIN. ELEVATED
LI/S ARE BELOW ZERO C...SO THUNDER IS POSSIBLE ALSO. THE TIMING AND
LIMITED INSTABILITY WILL KEEP SEVERE CHCS RATHER LOW. WE SHOULD
CLEAR OUT SAT AFTERNOON AND WARM INTO THE 60S WITH COOLER AIR MOVING
IN.

.LONG TERM...(SATURDAY NIGHT THROUGH WEDNESDAY)
ISSUED AT 312 AM EDT THU MAY 5 2016

OVERALL TREND IS FOR A FASTER PROGRESSION OF THE LOWS ON SATURDAY
AND MONDAY...SO THAT THE BEST CHANCE OF DRY WEATHER SANDWICHED IN
BETWEEN WILL BE SATURDAY NIGHT THROUGH SUNDAY NIGHT AS SFC HIGH IS
BRIEFLY OVER LOWER MICHIGAN. MOIST RETURN FLOW SETS UP FOR MONDAY
BUT RAINS SHOULD BE LIMITED BY SHORTWAVE RIDGING AHEAD OF A SLOWLY
ADVANCING WESTERN CONUS CUTOFF LOW.

TUESDAY AND WEDNESDAY LOOK UNSETTLED IN A PATTERN OF MID LEVEL WARM
ADVECTION/ISENTROPIC ASCENT JUST NORTH OF A SFC WARM FRONT. THERE
COULD BE A RUMBLE OF THUNDER BUT MID LEVEL INSTABILITY IS LIMITED
ENOUGH TO LEAVE THAT OUT OF THE FORECAST FOR NOW.

&&

.AVIATION...(FOR THE 06Z TAFS THROUGH 06Z THURSDAY NIGHT)
ISSUED AT 1138 PM EDT WED MAY 4 2016

THE RAIN WILL BE MOVING AWAY FROM THE TAF SITES TO START THE
PERIOD AS NORTHERLY WINDS DRAW DOWN A DRIER AIRMASS FROM NORTHERN
LOWER MI. THIS WILL CAUSE THE CEILINGS AND VISIBILITIES TO
IMPROVE AS WE GO THROUGH THE NIGHT INTO THURSDAY MORNING. THUS
WHAT IFR IS STILL LEVEL WILL GIVE WAY TO VFR CONDITIONS BY
THURSDAY AFTERNOON.


&&

.MARINE...
ISSUED AT 312 AM EDT THU MAY 5 2016

WE DOWNGRADED THE GALE WARNING TO A SMALL CRAFT ADVISORY A LITTLE
EARLIER AS THE GALE WARNING WAS SET TO EXPIRE. WINDS ARE STILL
GRADUALLY COMING DOWN AND WAVES WILL LAG THE WINDS BY A LITTLE BIT.
WAVES SHOULD COME DOWN ENOUGH BY LATE MORNING. THE CAVEAT TO THIS IS
WITH THE RIDGING BUILDING IN AND WEAK TROUGHING OVER THE WARMER LAND
MASS THAT WE COULD SEE SOME LOCAL WINDS PICK UP THIS AFTERNOON OVER
THE NEARSHORE WATERS. THIS COULD REQUIRE THE ADVISORY TO BE KEPT A
LITTLE LONGER.

THERE COULD BE A SIMILAR SETUP ON SAT AFTERNOON IN THE WAKE OF THE
COLD FRONT THAT MOVES THROUGH.

&&

.HYDROLOGY...
ISSUED AT 1155 AM EDT WED MAY 4 2016

RIVER FLOOD ADVISORIES ARE CURRENTLY POSTED FOR SYCAMORE CREEK NEAR
HOLT AND THE GRAND RIVER AT IONIA. BOTH ARE RISING BACK ABOVE
BANKFULL LEVELS AND SHOULD CREST THURSDAY OR FRIDAY BELOW FLOOD
STAGE. A FEW OTHER SITES ARE FORECAST TO CREST AROUND BANKFULL
THURSDAY OR FRIDAY.

RAINFALL TOTALS OF UP TO A HALF INCH FELL THROUGH THIS MORNING WITH
ANOTHER HALF INCH TO INCH EXPECTED THROUGH TONIGHT. THIS SHOULD HELP
TO KEEP RIVER LEVELS ELEVATED. THUNDERSTORMS ARE POSSIBLE
SATURDAY... SO RIVERS WILL NEED TO BE MONITORED INTO EARLY NEXT
WEEK.

&&

.GRR WATCHES/WARNINGS/ADVISORIES...
MI...NONE.
LM...SMALL CRAFT ADVISORY UNTIL 2 PM EDT THIS AFTERNOON FOR
     LMZ844>849.

&&

$$

SYNOPSIS...NJJ
SHORT TERM...NJJ
LONG TERM...OSTUNO
AVIATION...MJS
HYDROLOGY...63
MARINE...NJJ



USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.