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December 27/28 Storm Threat


Baroclinic Zone

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LONG TERM /WEDNESDAY THROUGH MONDAY/...

WEDNESDAY INTO FRIDAY...

/OVERALL/...

updated now and makes more sense

...STILL A LOT OF UNCERTAINTY CONCERNING SPECIFICS IN THE FCST...

...LIKELY TO BE CHANGES IN IMPACTS AND FORECASTED AMOUNTS...

...MAIN HAZARDS: WINTRY PRECIP...WINDS...COASTAL IMPACTS...

THERE IS AGREEMENT OF AN INSIDE-RUNNER SFC LOW WITH RESPECT TO THE

40N/70W BENCHMARK ALONG THE S COAST OF NEW ENGLAND COUPLED WITH A

NEGATIVELY TILTED H5 TROF BRINGING SIGNIFICANT WX FOR THE NERN CONUS

CENTERED AROUND THURSDAY. BUT THERE STILL REMAINS NUANCES WITH

RESPECT TO THERMAL PROFILES FROM THE SFC INTO THE MID-

LVLS...COUPLED WITH FORECAST PRECIPITATION AMOUNTS PARENT TO THE

TIMING OF THE LOW /THE 25.0Z NAM THE SLOWEST OF THE

GUIDANCE...WITH THE LATEST RUNS OF THE GFS-ECMWF-CANADIAN CLOSELY

CLUSTER AMONGST ONE ANOTHER/.

WORTHY OF NOTE IS THE CIPS ANALOG GUIDANCE /WHICH WAS INCREDIBLY

HELPFUL OVER MODEL GUIDANCE DURING THE FREEZING RAIN EVENT DECEMBER

16TH/. EVALUATING FOR THE THURSDAY MORNING TIMEFRAME DERIVED FROM

THE 24.12Z GFS...THE TOP 5 ANALOGS /PREVIOUS EVENTS THAT CORROBORATE

FAIRLY WELL TO THE ONCOMING STORM/ EXHIBIT SIGNIFICANT SNOWS OF A

FOOT OR MORE EXTENDING FROM ALLEGHENY MOUNTAINS IN PA NEWD INTO

MAINE...WITH A FREEZING RAIN EVENT FOR PORTIONS OF THE MID-ATLANTIC

EXTENDING NEWD INTO S NEW ENGLAND. WILL LEAN WITH THE FORECAST GRID

OUTPUT IN A SIMILAR MANNER.

/TEMPERATURES/...

AM NOT CONFIDENT WITH MODEL FCST 2M TEMPS NOR MAV/MET/ MOS GUIDANCE.

FOLLOWING CLOSELY WITH SFC DEWPOINTS...HAVE MODIFIED THE PRESENT

MOSGUIDE FCST LOWER ANTICIPATING AN EVAP COOLING SETUP WITH SFC

TEMPS COOLING TOWARDS THE WET BULB. AS WE HAVE SEEN BEFORE THIS COOL

SEASON...THERE IS A MORE NLY COMPONENT OF SFC WINDS EMANATING FROM

THE DEPARTING ARCTIC-ORIGIN SFC HIGH POORLY HANDLED BY EVEN NEAR-

TERM FCST GUIDANCE. CONSEQUENTIALLY COLD-AIR DAMMING PREVAILS

RESULTING IN A COASTAL FRONT SETUP. WHILE THIS STORM IS

SIGNIFICANTLY STRONGER THAN PRIOR EVENTS WITH A STRONGER ELY

ONSHORE COMPONENT...AM CONFIDENT TO BELIEVE THAT THE WARM-MOIST

TROWALING SIGNATURE IN A MAJORITY OF THE FCST GUIDANCE WILL

GRADUALLY SCOUR OUT THE LARGE COLD DOME INITIALLY DOWN TO A SFC

SHALLOW COLD LAYER FOR PORTIONS OF INTERIOR NEW ENGLAND LENDING TO

A FREEZING RAIN SETUP AWAY FROM SHORELINES AND THE COASTAL PLAIN.

/PRECIP TYPES/...

BEGINNING AS SNOW...AS WARMER AIR WRAPS AROUND THE LOW PRES

TRACKING ALONG THE S COAST OF NEW ENGLAND...THERE IS THE

EXPECTATION FOR INITIAL SNOWS TO TRANSITION OVER TO A MIX WITH

SLEET...THEN TO A FREEZING RAIN/SLEET MIX BEFORE CHANGING TO ALL

RAIN. ANTICIPATING A GRADUAL PROGRESSION SE TO NW WEDNESDAY NIGHT

INTO THURSDAY AS THE LOW IS EXPECTED TO PROGRESS ON BY /ONLY

PORTIONS OF S NH AND W MA WILL REMAIN IN SOME SORT OF WINTRY

PRECIP TYPE THROUGHOUT THE EVENT/. WITH THE SYSTEMS EXIT...COLDER

AIR DRAWN IN OUT OF THE NW SHOULD RESULT IN THE PROGRESSION OF

PRECIP FROM RAIN TO SNOW.

/PRECIPITATION AMOUNTS/...

...WINTER STORM WATCH FOR CENTRAL/WESTERN PORTIONS OF NEW ENGLAND...

...EXPECTING SNOW AMOUNTS AROUND 10 INCHES WITHIN THE WATCH...

...MINOR ICING UP TO 0.25 INCHES AROUND THE MA TURNPIKE...

...RAINFALL ACCUMULATIONS AROUND 1.25 INCHES FOR E/SE NEW ENGLAND...

MODERATE CONFIDENCE ON FCST PRECIP AMOUNTS...BUT DO AGREE THAT THE

NERN QUADRANT OF THE SFC LOW WILL SEE THE GREATEST AMOUNTS OF PRECIP

PARENT WITH THE THETAE TROWAL AXIS AND COUPLED WITH THE STRONGEST

DIFLUENCE ALOFT AND DEEP-LYR ASCENT. INITIALLY OVER-SPREADING WITH

ISENTROPIC ASCENT...THE HEAVIER PRECIPITATION SHOULD BAND ALONG AND

AHEAD OF THE SFC LOW...WRAPPING WESTWARD WITH THE WARM-CONVEYOR BELT

TOWARDS THE NWRN QUADRANT OF THE SFC LOW. COULD SEE SOME THUNDER AND

EMBEDDED HEAVY RAINS FOR SERN NEW ENGLAND WITH THE POSSIBILITY OF

SOME MINOR INSTABILITY WRAPPING INWARD PARENT WITH THE WARM CONVEYOR

BELT. IN LINE WITH THE AFOREMENTIONED CIPS ANALOG GUIDANCE...AM

EXPECTING HEAVIEST SNOWS N/W...WITH BETTER ICE ACCUMS IN S-CENTRAL

NEW ENGLAND /AROUND THE MA TURNPIKE/.

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Odd that there's no WSW for all of SNE with the cold trend just inland holding?

Seems they are following hpc snow potential. Hpc not showing much of sne in the greater than 4 inch zone. Same is happening down here . They put Sussex in watch but left our northern Morris .6z Gfs soundings show my area all snow through 42 with .75-1 inch qpf yet barley mention any snow for my area. Didnt check euro maps but earlier runs had me at 4+

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Merry Christmas--you clean up!

I'm going somewhat bullish for here with a 9-14" call at this point.

Yes, Mike, inland areas look to get crushed - hoping for a weenie 20" but that would likely be a tad north. Even the immediate coast gets a good thump before NCP. I don't think 9-14 for you is bullish at all ... seems quite reasonable and I suspect you'll verify on the high end.

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looks good for me ! 10 to 14"!!StormTotalSnowFcst.png

That jives well with BTV and GYX's maps... although this may be the one time I agree with Blizz that I'm really surprised there's no watch down in the Pike area and BOX's northern CT zones.

BOX has always seemed to issue watches for "travel impact" even if it doesn't meet criteria, so even if they think it will fall short, I'm surprised during the holiday week there's no watch out.

At the very least they'll go to an advisory in those areas southern areas anyway even for their forecasted amounts of snow/ice (as low as they are) so why not get the heads up out there early.

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several models now showing over a foot of snow from central mass northward not sure why BOX has not issued WSW further south! in fact here in southern nh a couple have us getting 12 to 18"!!! That would be sweet but I am thinking a foot is a safe bet at this point!

Keeping expectations tempered still. 6" for interior SE NH :)

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Details?

Looks like all snow for us. I have the 1.50" line running RUT-BML-IWI. There's a 2.00" bubble from AFN-MHT-PSM. The rest of NNE is over 1.00". EC ens mean is a widesprea 1.00" with a 1.50" zone for SW ME, C to SE NH, and E MA. I just had to laugh at how much it was regurgitating out.
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Looks like all snow for us. I have the 1.50" line running RUT-BML-IWI. There's a 2.00" bubble from AFN-MHT-PSM. The rest of NNE is over 1.00". EC ens mean is a widesprea 1.00" with a 1.50" zone for SW ME, C to SE NH, and E MA. I just had to laugh at how much it was regurgitating out.

Is that not 3 days in a row with us Jeff and Eric in a zone of 1.5 or more on at least 2 of the models? 12-18 with lolls higher seems quite doable....although these things don't always work out that way.

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Looks like all snow for us. I have the 1.50" line running RUT-BML-IWI. There's a 2.00" bubble from AFN-MHT-PSM. The rest of NNE is over 1.00". EC ens mean is a widesprea 1.00" with a 1.50" zone for SW ME, C to SE NH, and E MA. I just had to laugh at how much it was regurgitating out.

lol ... nice. Enjoy the 20" paste bomb.

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