789
FXUS63 KGRR 071746
AFDGRR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
146 PM EDT SAT JUN 7 2025
KEY MESSAGES
- UPPER LOW BRINGS SOME RAIN EARLY NEXT WEEK
DISCUSSION
ISSUED AT 311 AM EDT SAT JUN 7 2025
ONE MORE DAY OF FAIR WEATHER BEFORE RAIN CHANCES INCREASE ON
SUNDAY IN ADVANCE OF A VIGOROUS UPPER LOW MOVING ACROSS THE GREAT
LAKES REGION. BEFORE THEN...THERE IS A SLIGHT CHANCE OF RAIN
ACROSS THE FAR SOUTHERN ZONES TONIGHT AS A SFC LOW TRACKS ACROSS
THE OHIO VALLEY.
THE UPPER LOW APPROACHES ON SUNDAY WITH AN AXIS OF POSITIVE
VORTICITY ADVECTION AND UPPER LEVEL DIVERGENCE MOVING THROUGH IN
THE AFTERNOON AND EVENING. THUNDER POTENTIAL IS LIMITED BY
MARGINAL INSTABILITY WITH FORECAST SOUNDINGS SHOWING CONVECTIVE
INHIBITION PERSISTING THROUGH THE AFTERNOON.
A SECONDARY AREA OF DIFFERENTIAL POSITIVE VORTICITY ADVECTION
ASSOCIATED WITH THE CORE REGION OF THE UPPER LOW MOVES IN BY
MONDAY AFTERNOON AND COMBINES WITH DEEPER MOISTURE AND STEEPENING
LAPSE RATES/INSTABILITY TO BRING A STRONGER DIURNAL ENHANCEMENT OF
SHOWERS AND THUNDERSTORMS IN THE AFTERNOON AND EVENING. THE LOW
MOVES OUT LATE TUESDAY WITH FAIR WEATHER RETURNING FOR WEDNESDAY.
AVIATION /18Z TAFS THROUGH 18Z SUNDAY/
ISSUED AT 143 PM EDT SAT JUN 7 2025
VFR CONDITIONS WILL CONTINUE FOR MOST OF THE TAF PERIOD. GUSTY
EASTERLY WINDS WILL CONTINUE THROUGH THE DAYTIME AND WILL SUBSIDE
THIS EVENING, AROUND 00Z. A WEATHER SYSTEM MOVING IN EARLY
TOMORROW WILL BRING A CHANCE FOR LIGHT SHOWERS TO THE SOUTHERN TAF
SITES. WHILE MODELS VARY ON TIMING AND COVERAGE, HAVE PUT VCSH IN
AZO, BTL AND JXN. NO REDUCTIONS IN VSBYS IN EXPECTED AT THIS TIME.
ALONG WITH THAT SYSTEM THERE IS A SMALL SIGNAL FOR A PERIOD OF
MVFR CIGS LATE TOMORROW MORNING, BETWEEN 12Z AND 18Z.
A BETTER CHANCE FOR SHOWERS WILL COME SUNDAY EVENING.
MARINE
ISSUED AT 114 AM EDT SAT JUN 7 2025
WINDS AND WAVES ARE EXPECTED TO BE RELATIVELY CALM THROUGH THE
MIDDLE OF NEXT WEEK WITH WINDS LESS THAN 20 KNOTS AND WAVES 3 FEET
OR LESS.
GRR WATCHES/WARNINGS/ADVISORIES
MI...NONE.
MARINE...NONE.
DISCUSSION...OSTUNO
AVIATION...CERU
MARINE...OSTUNO
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