Snippet from NWS GYX, pretty strong wording.
"THE GREATEST PERIOD OF CONCERN IS LOOK TO BE ROUGHLY 12Z TO 21Z
TUE. HERE THE BEST COMBINATION OF SNWFL AND WINDS LOOKS MOST
LIKELY. THE ECMWF HAS A 65+ KT LOW LEVEL JET AT 900 MB LIFTING NWD
ACROSS THE AREA.
DEEP COLD AIR IN PLACE WILL ALLOW SOME OF THIS TO
MIX DOWN FAIRLY EASILY. GIVEN THE EXPECTED SNWFL AROUND THAT
TIME...AND POTENTIALLY 45-50 KT GUSTS MIXING DOWN...BLIZZARD
WARNINGS LOOK GOOD. ELSEWHERE COULD SEE BRIEF NEAR-BLIZZARD
CONDITIONS BUT THERE WAS NOT ENOUGH CONFIDENCE TO EXPAND...OUTSIDE
OF ERN HILLSBOROUGH. WHERE THE COMBINATION OF 1 INCH OR MORE PER
HOUR RATES AND 50 KT GUSTS OCCURS...
TRAVEL WILL BE IMPOSSIBLE AND
LIFE THREATENING.
THE NEXT 12 HOURS WILL BE CRITICAL AS MODELS BEGIN TO HONE IN ON
THE MESOSCALE DETAILS. SOME SURPRISES ARE STILL LIKELY WITH THIS
STORM...AS THE VERY DYNAMIC EVENTS CAN CAUSE NWP TO STRUGGLE AT
TIMES."
And BOX - oohh these are soon to be legendary NWS AFD's!
AS STATED THERE IS THE LIKELIHOOD OF
TWO BANDING LOCATIONS...ONE
FROM TYPICAL MID-LVL DEFORMATION AND NEGATIVE EPV...WITH THE OTHER
CLOSER TO THE SFC INVOF OF THE COASTAL FRONT ACROSS RI-SE MA OR
NEAR THE I-95 CORRIDOR. WHILE NAILING THESE DOWN IS DIFFICULT
ALMOST 24 HOURS OUT...MESOSCALE MODELS DO AT THE VERY LEAST
INDICATE THAT
WITHIN EITHER OF THESE BANDS...DENDRITIC GROWTH WILL
LIKELY BE NEAR A MAXIMUM AND WITH BANDS OF VERY NEGATIVE EPV...2-3
IN/HR SNOWFALL AMOUNTS WITHIN EITHER OF THESE BANDS ARE LIKELY
BEGINNING LATE TONIGHT...AND CONTINUING WELL INTO THE DAY ON TUE
AS THESE BANDS SLOWLY PIVOT AND BEGIN A SLOW SHIFT TO THE E. GIVEN
THE SLOW MOVEMENT...THIS ALSO SUGGESTS THAT SOME AREAS COULD SEE
SNOWFALL AMOUNTS OF ABOUT A FOOT IN 6 HOURS OR EVEN LESS.
