768
FXUS63 KGRR 041730
AFDGRR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
1230 PM EST TUE FEB 4 2025
KEY MESSAGES
- LESS POTENTIAL FOR SIGNIFICANT FREEZING RAIN WEDNESDAY NIGHT
- WINDY THURSDAY
- MIX OF PRECIPITATION LIKELY SATURDAY
DISCUSSION
ISSUED AT 300 AM EST TUE FEB 4 2025
- LESS POTENTIAL FOR SIGNIFICANT FREEZING RAIN WEDNESDAY NIGHT
OVERALL SHORT RANGE GUIDANCE TRENDS CONTINUE TO SHIFT FURTHER
SOUTH WITH THE AXIS OF RELATIVELY HEAVIEST FREEZING RAIN WEDNESDAY
NIGHT. IT NOW APPEARS THAT THE AXIS OF RELATIVELY HEAVIEST FZRA
WILL OCCUR NEAR TO MAINLY SOUTH OF THE MI/IN BORDER IN CLOSER
PROXIMITY TO THE WARM FRONT ACROSS THE LOWER OH VALLEY REGION
WHERE THERE WILL BE MORE IN THE WAY OF FORCING/ISENTROPIC UPGLIDE
AND LIFT.
BASED ON SHORT RANGE GUIDANCE TRENDS WE HAVE THEREFORE LOWERED
FORECAST FZRA AMOUNTS TO AROUND A TENTH TO FIFTEEN HUNDREDTHS OF
AN INCH NEAR TO SOUTH OF I-94 AND LESS THAN A TENTH OF AN INCH
NORTH OF I-94. THESE AMOUNTS MAY NEED TO BE TWEAKED DOWN LOWER IF
THE MODEL TRENDS OF THE PAST 24-48 HRS CONTINUE.
- WINDY THURSDAY
IT WILL BECOME QUITE WINDY THURSDAY AS THE PRESSURE GRADIENT
BETWEEN THE STRENGTHENING SFC LOW MOVING ACROSS ONTARIO AND HIGH
PRESSURE RIDGE OVER THE NORTHERN PLAINS STRENGTHENS. LATEST 00Z
ENSEMBLES SUGGEST PEAK WIND GUSTS COULD REACH AROUND 40 MPH BUT
AS SUCH STAYING BELOW WIND ADVISORY CRITERIA.
- MIX OF PRECIPITATION LIKELY SATURDAY
AN OVERALL CONSENSUS BLEND OF LATEST MEDIUM RANGE GUIDANCE
CONTINUES TO SUGGEST THAT A LOW PRESSURE SYSTEM MOVING ENE ACROSS
THE LOWER GREAT LAKES REGION WILL BRING A WINTRY MIX OF PCPN TO
OUR AREA SATURDAY. IT IS TOO EARLY TO GET INTO TOO MANY SPECIFICS
BUT AT THIS TIME WE EXPECT A MOSTLY SNOW EVEN NORTH OF I-96 WITH
POTENTIAL FOR SNOW/SLEET/FZRA NEAR TO SOUTH OF I-96. THIS SYSTEM
WILL BE RATHER PROGRESSIVE IN A FAST ZONAL UPPER LEVEL PATTERN BY
THEN.
AVIATION /18Z TAFS THROUGH 18Z WEDNESDAY/
ISSUED AT 1226 PM EST TUE FEB 4 2025
NORTHERLY FLOW WILL CONTINUE TO ADVECT SOME LOW LEVEL MOISTURE
DOWN INTO THE REGION LEADING TO VFR/MVFR CONDITIONS TO START THE
PERIOD. DRYING IS EXPECTED BY MID TO LATE AFTERNOON SO THAT SHOULD
SUPPORT VFR CONDITIONS PREVAILING FOR THE REMAINDER OF THE PERIOD.
ANY LEFTOVER FLURRIES WILL ONLY LAST ANOTHER HOUR OR TWO AND RADAR
SHOWS A DIMINISHING TREND TO WHAT IS OUT THERE NOW.
GRR WATCHES/WARNINGS/ADVISORIES
MI...NONE.
MARINE...SMALL CRAFT ADVISORY UNTIL 7 PM EST THIS EVENING FOR LMZ844>849.
DISCUSSION...LAURENS
AVIATION...MJS
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