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Brief Winter shot discussion


ORH_wxman

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Initial pulse of precip develops as it moves across SNE and the waters to the south rocketing ENE....moving so fast it's probably rain or just mangled flakes. Once it gets out east of Plymouth and Boston it begins to take on that distinct curl, maybe clipping into NE MA and scratching along the coast as it moves SE while fading.

I don't see this doing much anywhere. Maybe areas from Boston north along the coast can cash in, but who cares otherwise, this will be a radar tease as nice banding sets up just offshore.

Most places aren't going to get much...but someone will get lucky from the S tip of Maine to the MA coast.

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BOX:

.NEAR TERM /THROUGH TONIGHT/...

SHARPENING MID LEVEL TROF AND POTENT SHORTWAVE MOVES ACROSS SNE

TONIGHT. SFC REFLECTION IN THE FORM OF A WAVE DEVELOPS ON THE SFC

BOUNDARY TONIGHT BEFORE MOVING EAST OF NEW ENG BY SAT MORNING. A

NORLUN TROF SIGNATURE SETS UP ACROSS NEW ENG WHICH WILL LIKELY

BRING A PERIOD OF ACCUMULATING SNOW TO PORTIONS OF NEW ENG...BUT

IT IS NOT A CERTAINTY WHERE THIS OCCURS. NORMALLY IN THESE

SITUATIONS SNOWFALL IS FOCUSED IN A NARROW BAND ALONG AND N OF THE

BOUNDARY. IF YOU ARE NOT IN A BAND...SNOW AMOUNTS ARE VERY LIGHT. IT

IS OFTEN DIFFICULT TO PINPOINT WHERE THESE BANDS WILL SET UP AS

MESOSCALE PROCESSES TYPICALLY DICTATE WHERE THIS HAPPENS...SO

FORECAST CONFIDENCE FOR ANY GIVEN LOCATION IS NOT HIGH.

LATEST GUIDANCE IS TARGETING AREAS FROM S NH THROUGH NE

MA...MAINLY N OF ORE-ORH-PYM FOR BEST CHANCE OF ACCUMULATING SNOW.

THIS FAVORS CLIMATOLOGY SO WE ARE USING THIS AS A BASIS FOR THE

FORECAST. EVEN 18Z NAM IS STARTING TO COME AROUND TO GFS AS IT HAS

SHIFTED THE QPF AXIS TO THE N.

THERE IS DECENT SNOW GROWTH OMEGA AND EXCELLENT INSTABILITY AS -35

TO -40C 500 MB TEMPS MOVE INTO THE REGION. THIS RESULTS IN VERY

STEEP MID LEVEL LAPSE RATES AND TT SPIKE INTO UPPER 50S SO THERE

IS POTENTIAL FOR BRIEF HEAVY SNOW IN ANY SNOW BANDS. OUR LATEST

FORECAST IS FOR 1-4" FROM S NH THROUGH E MA...WITH THE HIGHEST

AMOUNTS ACROSS S NH AND NE MA. NO ADVISORIES DUE TO UNCERTAINTY OF

WHERE SNOW BANDS WILL SET UP...BUT LATER FOERCASTS MAY NEED TO

CONSIDER ONE.

Very unstable look off the coast right now. Load sof virga and clouds rocketing SSW from the ocean.

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18z NAM's FRH grid shows slightly more QPF than the 12z for BOS, as well ... an interval of 50 degree wind, which as more eastward component than the 12z. That actually makes the NORLUN checklist a little more convincing, actually.

Have to remember, the NAM QPF is just a model depiction. If there are meso-physical or beta-micro-scaled physical processes going on that even the NAM is not detecting above crued hum than said QPF can be significantly under stated.

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