Area Forecast Discussion
Issued by NWS Grand Rapids, MI

Home | Current Version | Previous Version | Graphics & Text | Print | Product List | Glossary On
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
000
FXUS63 KGRR 231724
AFDGRR

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
124 PM EDT THU APR 23 2015

LATEST UPDATE...
AVIATION

.SYNOPSIS...
ISSUED AT 330 AM EDT THU APR 23 2015

AFTER A FEW LIGHT SNOW SHOWERS/FLURRIES THIS MORNING...THE AREA WILL
SEE CONDITIONS DRY OUT FOR THE REST OF THE WORK WEEK. TEMPERATURES
WILL REMAIN QUITE A BIT BELOW AVERAGE TODAY WITH HIGHS ONLY IN THE
40S. TEMPERATURES WILL THEN MODERATE A BIT BEGINNING ON FRIDAY. WE
ARE LOOKING AT ANOTHER ROUND OF FREEZING TEMPERATURES FOR TONIGHT
ACROSS THE AREA.

A SYSTEM WILL TRY TO MOVE IN ACROSS THE AREA DURING THE DAY ON
SATURDAY. IT LOOKS LIKE THAT ONLY LOCATIONS ALONG I-94 WILL SEE SOME
LIGHT RAIN...WHILE A CHANCE WILL BE POSSIBLE UP TO ALMOST I-96.
CONDITIONS WILL THEN DRY OUT ONCE AGAIN FOR THE SECOND HALF OF THE
WEEKEND AND EARLY NEXT WEEK ALONG WITH SOMEWHAT MILDER TEMPERATURES.

&&

.UPDATE...
ISSUED AT 1141 AM EDT THU APR 23 2015

JUST MADE A FEW TWEAKS TO TEMPERATURES AND POPS FOR TODAY. LOOKS
LIKE THE SNOW SHOWERS ARE PRETTY MUCH DONE AS THE STRATUS DECK
THINS OUT SO ONLY SCATTERED FLURRIES THE NEXT COUPLE HOURS.
TWEAKED MAXES DOWN SLIGHTLY FOR THIS AFTERNOON. TEMPS ARE COLD
RIGHT NOW...ONLY IN THE MID 30S MOST PLACES...BUT MAXES SHOULD
REACH THE LOWER TO MID 40S WHEN THE CLOUDS BREAK UP LATER IN THE
AFTERNOON. WE WILL BE ISSUING ANOTHER FREEZE WARNING FOR TONIGHT
WITH THE AFTERNOON ISSUANCE OF THE FORECAST PACKAGE.

&&

.SHORT TERM...(TODAY THROUGH SATURDAY)
ISSUED AT 330 AM EDT THU APR 23 2015

OUR MAIN CHALLENGES IN THE SHORT TERM REVOLVE AROUND FROST/FREEZE
HEADLINES FOR TONIGHT...AND RAIN CHANCES FOR SATURDAY.

SNOW SHOWERS THAT HAD PERKED UP A BIT LATE LAST EVENING ACROSS THE
AREA HAVE SINCE DIMINISHED IN COVERAGE AND INTENSITY OVER THE PAST
COUPLE OF HOURS. WE EXPECT THAT TREND TO CONTINUE THIS MORNING AS
THE SHORT WAVE RESPONSIBLE IS NOW MOVING OFF TO OUR S AND E. WE WILL
RETAIN A LOW CHC OF SNOW SHOWERS/FLURRIES IN THE FCST THIS MORNING
AS THE SHEAR ZONE WITH THE UPPER JET CORE WILL BE COMING THROUGH.
SOME MOISTURE IN THE DGZ WILL HOLD ON UNTIL ABOUT 18Z...KEEPING THE
CHC OF FLURRIES IN THROUGH THEN.

WE THEN EXPECT A BREAK IN THE WEATHER FROM LATER THIS AFTERNOON
THROUGH MOST OF FRI NIGHT. THE UPPER FLOW WILL TRANSITION TO BECOME
ANTI-CYCLONIC AND THE SFC RIDGE WILL MOVE ACROSS THE STATE. THIS
QUIET WEATHER...CLEAR SKIES...AND LIGHT WINDS WILL ALLOW FOR TEMPS
ACROSS THE ENTIRE AREA TO DROP DOWN BELOW FREEZING TONIGHT. WE ARE
LOOKING AT ANOTHER FREEZE WARNING FOR TONIGHT FOR THE COUNTIES THAT
HAVE OFFICIALLY STARTED THEIR GROWING SEASON. THIS COULD BE SOMEWHAT
OF A HARD FREEZE AS TEMPS ARE FCST TO DROP DOWN INTO THE UPPER 20S.

CLOUDS WILL BE ON THE INCREASE FROM LATE FRI THROUGH FRI NIGHT
ACROSS THE AREA...WITH THE CHC OF RAIN INCREASING ACROSS THE SRN
PORTION OF THE AREA TOWARD DAYBREAK ON SAT AND DURING THE DAY. THERE
IS AN UPPER TROUGH THAT WILL EMERGE FROM THE DESERT SW AND TRY TO
MOVE NE TOWARD THE AREA. THERE ARE SOME DIFFERENT SCENARIOS IN HOW
FAR NORTH THE RAIN GETS.

WE ARE THINKING THAT THE MODEL WITH A FARTHER NORTH SOLUTION WITH
THE RAIN IS HAVING ISSUES WITH SHORT WAVE ENERGY. WE BELIEVE THAT
THE RAIN WILL TRY TO SNEAK ACROSS I-94. HOWEVER A DRY NE FLOW IN THE
LOWER LEVELS AND AN UPPER TROUGH DRIVING SOUTH OUT OF CANADA WILL
LIKELY SUPPRESS MOST OF THE RAIN SOUTH OF THE CWFA...WITH SOME LIGHT
RAIN LIKELY ALONG I-94. IT IS POSSIBLE NRN AREAS WILL KEEP A DECENT
AMOUNT OF SUNSHINE ON SAT. TEMPS WILL LIKELY BE A LITTLE WARMER
FURTHER NORTH WITH THE SUNSHINE.

.LONG TERM...(SATURDAY NIGHT THROUGH WEDNESDAY)
ISSUED AT 330 AM EDT THU APR 23 2015

UPPER LOW IN THE SHORT TERM OVER THE GREAT LAKES...LINGERS OVER THE
NORTHEAST PORTION OF THE CONUS INTO MUCH OF THE LONG TERM. BY THE
END OF THE PERIOD...WEDNESDAY...THE UPPER PATTERN IS TRANSITIONING
TO MORE OF A ZONAL FLOW ACROSS THE CONUS. HAVE LEANED TOWARD THE
ECMWF WITH THIS FORECAST PACKAGE. IN GENERAL...EXPECTING MAINLY DRY
CONDITIONS AND SLOWLY MODERATING TEMPERATURES.

IN REGARD TO PRECIPITATION...HAVE A LITTLE BIT OF LIGHT RAIN
LINGERING INTO SATURDAY EVENING ACROSS THE I-94 ROW OF COUNTIES.
ONLY HAVE A 30 POP IN THE FORECAST SATURDAY EVENING AND ITS
DEBATABLE IF WE WILL SEE ANYTHING.

OTHERWISE...HAVE A DRY FORECAST SUNDAY THROUGH WEDNESDAY AS THERE IS
LITTLE IN THE WAY OF SIGNIFICANT FEATURES. SURFACE PATTERN IS ONE OF
MAINLY HIGH PRESSURE. ALOFT...SUNDAY INTO MONDAY A CASE COULD BE
MADE FOR SOME LIGHT SHOWERS ON THE BACK EDGE OF THE UPPER LOW
CIRCULATION...BUT DID NOT FEEL CONFIDENT ENOUGH TO CARRY POPS AT
THIS POINT.

&&

.AVIATION...(FOR THE 18Z TAFS THROUGH 18Z FRIDAY AFTERNOON)
ISSUED AT 124 PM EDT THU APR 23 2015

VFR CONDITIONS CAN BE EXPECTED OVER THE NEXT 24 HOURS. CEILINGS
AROUND 4K FT WILL GRADUALLY LIFT AWAY LATER THIS AFTERNOON. THE
CLEARING LINE AS OF 17Z WAS NEARLY TO MKG AND WILL PROGRESS EAST.
MOST OF THE AREA SHOULD BECOME SCATTERED BY 21Z.

WEST NORTHWEST WINDS WILL REMAIN BRISK AND SHOULD BECOME A BIT
GUSTY AS THE CLEARING OCCURS. GUSTS TO AROUND 20 KNOTS CAN BE
EXPECTED UNTIL AROUND 00-01Z WHEN WINDS QUICKLY BECOME LIGHT.
LIGHT WINDS CAN BE EXPECTED INTO FRIDAY MORNING.

&&

.MARINE...
ISSUED AT 330 AM EDT THU APR 23 2015

CONDITIONS OUT ON THE NEARSHORE WATERS WILL BE A BIT BETTER THAN
THEY HAVE BEEN THE PAST FEW DAYS. WE ARE NOT EXPECTING TO NEED ANY
HEADLINES UNTIL POTENTIALLY ON SATURDAY. WINDS WILL REMAIN IN THE 10
TO 20 KNOT RANGE TODAY WITH A POSSIBLE GUST OR TWO AROUND SCA
CRITERIA LATER THIS AFTERNOON. THIS SHOULD NOT BE SIGNIFICANT ENOUGH
TO NEED A HEADLINE.


&&

.HYDROLOGY...
CORRECTED AT 1258 PM EDT THU APR 23 2015

HYDRO CONCERNS ARE FAIRLY MINIMAL OVER THE NEXT WEEK. RIVER LEVELS
ACROSS SOUTHWEST LOWER MICHIGAN ARE MOSTLY FALLING. DRY WEATHER IS
EXPECTED THIS AFTERNOON THROUGH FRIDAY NIGHT WITH SURFACE HIGH
PRESSURE SLIDING BY OFF TO OUR SOUTH. WIDESPREAD RAINFALL IS
POSSIBLE ON SATURDAY ACROSS SOUTHERN LOWER MICHIGAN. A TENTH TO
QUARTER INCH OF RAINFALL IS POSSIBLE SOUTH OF INTERSTATE 96. BUT DRY
WEATHER RETURNS SATURDAY NIGHT THROUGH NEXT WEEK. BRIEF RISES ARE
CERTAINLY POSSIBLE DUE TO SATURDAY RAINFALL...BUT RIVER FLOODING
IS NOT EXPECTED.

&&

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

$$

UPDATE...OSTUNO
SYNOPSIS...NJJ
SHORT TERM...NJJ
LONG TERM...DUKE
AVIATION...JK
HYDROLOGY...EBW
MARINE...NJJ





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