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000
FXUS63 KGRR 271531
AFDGRR

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
1031 AM EST FRI FEB 27 2015

LATEST UPDATE...
UPDATE

.SYNOPSIS...
ISSUED AT 320 AM EST FRI FEB 27 2015

CONTINUED COLD THROUGH THE WEEKEND WITH SOME LIGHT SNOW POSSIBLE
NEAR LAKE MICHIGAN TODAY AND MORE WIDESPREAD SNOW EXPECTED SUNDAY
AND SUNDAY NIGHT. A BRIEF WARMUP IS EXPECTED ALONG WITH A MIX OF
RAIN AND SNOW TUESDAY AND TUESDAY NIGHT...BEFORE COLD WEATHER
RETURNS FOR THE REST OF NEXT WEEK.

&&

.UPDATE...
ISSUED AT 1030 AM EST FRI FEB 27 2015

I UPDATED THE FORECAST TO HAVE THE LAKE SNOW BAND AS IT MOVES ON
SHORE BE MORE PERSISTENT. THE LATEST NAM12 SHOWS DECENT LIFT IN
THE DGZ WITH ENOUGH MOISTURE TO KEEP THE SNOW BAND GOING INTO
EARLY THIS AFTERNOON. OTHERWISE THE ON GOING FORECAST LOOKS GREAT.

&&

.SHORT TERM...(TODAY THROUGH SATURDAY NIGHT)
ISSUED AT 320 AM EST FRI FEB 27 2015

LITTLE IMPACT WEATHER IN THE SHORT TERM WITH VERY COLD
TEMPERATURES REMAINING AND ONLY SOME LIGHT SNOW POSSIBLE NEAR
LAKE MICHIGAN TODAY. OTHERWISE...MONITORING THE APPROACH OF A
SYSTEM LATE SATURDAY THAT DOES NOT APPEAR TO MOVE THE POSSIBILITY
OF SNOW INTO MICHIGAN UNTIL SUNDAY.

VERY COLD START TO TODAY WITH TEMPERATURES WELL BELOW ZERO AND
SLOW RECOVERY LEADING TO ANOTHER DAY WITH HIGH TEMPERATURES IN
THE 10-20 DEGREE ABOVE ZERO RANGE. SNOW BAND CURRENTLY OVER LAKE
MICHIGAN TO CONTINUE TO SLOWLY WORK INLAND THIS MORNING WEAKENING
AS IT MOVES OVER LAND. A FEW LOCATIONS ALONG THE COAST COULD SEE
A SLOW INCH OR SO THIS MORNING...BUT FOR THE MOST PART JUST A FEW
FLURRIES WEST OF US-131 TODAY AND NO SIGNIFICANT IMPACTS
EXPECTED.

ANOTHER VERY COLD NIGHT AGAIN TONIGHT WITH SOME CLEARING SKIES
BRINGING NEAR ZERO AND BELOW ZERO TEMPERATURES TO LOWER MICHIGAN
AGAIN. SATURDAY AGAIN A COLD DAY WITH INCREASING CLOUDS SATURDAY
NIGHT AHEAD OF AN APPROACHING SYSTEM THAT MAY BRING SOME SNOW TO
THE AREA SUNDAY.

.LONG TERM...(SUNDAY THROUGH THURSDAY)
ISSUED AT 320 AM EST THU FEB 26 2015

FOCUS REMAINS ON TWO EVENTS IN THE LONG TERM...NAMELY SNOW ON SUNDAY
AND THEN THE SYSTEM FOR NEXT WEEK TUESDAY INTO WEDNESDAY.

REGARDING THE SUNDAY SYSTEM IT APPEARS TO HAVE NUDGED A BIT TO THE
SOUTH...AS THE UPPER WAVE DRIVING THE SNOW DIGS INTO THE GREAT LAKES
REGION MORE. THE AXIS OF HEAVIEST PRECIPITATION IS SOLIDLY ACROSS
INDIANA. THE SNOW SPREADS IN LATE SATURDAY NIGHT WITH THE BULK
FALLING DURING THE DAY ON SUNDAY. THE SNOW SHOULD WIND DOWN SUNDAY
EVENING. AMOUNTS MAY BE JUST A TOUCH LOWER THAN WHAT WE WERE
THINKING LAST NIGHT. MAYBE AN INCH OR SO ACROSS CENTRAL LOWER
MI...AND 2-4 INCHES TOWARDS I-94.

A BRIEF LULL IN THE WEATHER FOR SUNDAY NIGHT INTO MONDAY NIGHT
BEFORE FOCUS SHIFTS TO THE NEXT SYSTEM. THE TUESDAY SYSTEM HAS LOST
A BIT OF MODEL TO MODEL CONTINUITY AGAIN WITH THE GFS BEING
QUICKER...DEEPER AND FURTHER NORTH. THE ECMWF IS SLOWER AND
EVENTUALLY NEARS THE SAME DEPTH OF THE GFS. THE CANADIAN DOESN/T
OFFER MUCH OF A LEAN EITHER WAY BEING WEAKER AND SOUTH.

AT THIS POINT TAKING A STAY THE COURSE TYPE OF APPROACH WITH THE
TUES/WED SYSTEM GIVEN HOW IT EVOLVES. ESSENTIALLY IT IS DRIVEN BY A
SHORTWAVE EJECTING OUT OF THE SOUTHWEST U.S. UPPER TROUGH. THESE
TYPE OF SYSTEMS ARE FICKLE AND TOUGH TO NAIL DOWN DETAILS ON
ESPECIALLY AT RANGE IN THE FORECAST.

AT THIS POINT FORECAST IS FOR LIGHT SNOW...LOW CHANCES...DEVELOPING
MONDAY NIGHT. ON TUESDAY A SNOW...SLEET...FREEZING RAIN MIX CHANGING
TO FREEZING RAIN AND RAIN. BOTH THE GFS AND ECMWF SHOW A SURGE OF
WARMER AIR INTO THE CWA...THE EURO IS JUST SLOWER WITH IT. MY
INTUITION TELLS ME TO GO WITH THE SLOWER EURO GIVEN A DIGGING TROUGH
DOWN THE WEST COAST. SLOWER IS USUALLY THE WAY TO GO GIVEN THIS
PATTERN. MIX OF RAIN AND SNOW TUESDAY NIGHT CHANGING BACK TO SNOW ON
WEDNESDAY. BOTTOM LINE WE HAVE A WAYS TO GO YET IN DETERMINING THE
FINE DETAILS WITH THIS SYSTEM. BIGGEST IMPACT IN OUR AREA LOOKS TO
BE THE FREEZING PRECIPITATION AS THE HEAVIER SNOW SWATH LAYS DOWN
ACROSS NORTHERN LOWER. STAY TUNED FOR FURTHER MODEL ADJUSTMENTS
THOUGH.

COLDER AIR SWEEPS IN BEHIND THE SYSTEM FOR THURSDAY WITH LAKE SNOWS
LIKELY.

&&

.AVIATION...(FOR THE 12Z TAFS THROUGH 12Z SATURDAY MORNING)
ISSUED AT 709 AM EST FRI FEB 27 2015

WINDS ARE TURNING ON SHORE THIS MORNING AND CLOUDS THAT HAVE BEEN
OUT OVER THE LAKE WILL PUSH INLAND THROUGH THE TAF SITES TODAY.
THERE WILL BE A FEW FLURRIES TOWARDS LAKE MICHIGAN AS WELL.
SCT-BKN CLOUDS WITH BASES OF 3500-5000FT CAN BE EXPECTED. WINDS
FROM THE WEST-SOUTHWEST AT 8-12 KNOTS SHOULD DEVELOP TOWARDS
MIDDAY AND CONTINUE THROUGH THE AFTERNOON.

THE CLOUDS SHOULD SCATTER OUT TONIGHT IN MOST LOCATIONS...BUT MAY
CONTINUE BROKEN THROUGH THE NIGHT AT KMKG.

THERE ARE HINTS IN MODEL DATA THAT THE CEILINGS THIS AFTERNOON AND
OVERNIGHT MAY DIP INTO THE MVFR CATEGORY BETWEEN 2000-3000FT. DID
NOT INCLUDE MVFR CIGS IN THE TAFS AT THIS POINT.


&&

.HYDROLOGY...
ISSUED AT 327 PM EST THU FEB 26 2015

CURRENTLY NO SUSPECTED ICE JAMS OR SIGNIFICANT CHANGES TO RIVER
LEVELS. ICE JAM AND FLOOD THREAT REMAINS LIMITED AT LEAST THROUGH
THE WEEKEND. A SIGNIFICANT WARM-UP OR RAINFALL EVENT WOULD INCREASE
THE POTENTIAL. THE MAGNITUDE OF WARMER AIR AND RAINFALL ACCOMPANYING
THE TUESDAY/WEDNESDAY SYSTEM... AND THUS ITS IMPACT ON RIVERS... IS
UNCERTAIN.

&&

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

$$

UPDATE...WDM
SYNOPSIS...MACZKO
SHORT TERM...MACZKO
LONG TERM...DUKE
AVIATION...DUKE
HYDROLOGY...CAS