Blogs

 

Ocean Effect Snow Breakout and a Clipper/Coastal Storm next week

Latest NAM run 00z shows a strong potential for ocean effect snow event from the Cape Cod Canal eastward to Provincetown on northerly winds, also unidirectional wind flow from 900mb to the surface indicates a single band event is probable along with a strong instability burst from 850mb to surface ocean temperature differential (Delta Ts) of 18-20C which is sufficient enough to produce heavy snows over the Cape and Islands.  Also the flow is stronger than 10mph which should be sufficient enough

USCAPEWEATHERAF

USCAPEWEATHERAF

 

January 17th/18th Major Storm Threat

12z models trending towards a major coastal redeveloping nor'easter come next Tuesday into Wednesday.  NWS Taunton WFO has a 50% of snow in the forecast for Tuesday and 40% chance of snow for Wednesday, depending upon whether or not the trough closes off at H5 into a low will determine the duration of this winter storm, could be anywhere between 18-36 hours of snow

USCAPEWEATHERAF

USCAPEWEATHERAF

 

"Blizzard of 2018" "Storm of the Century"

Good evening folks,  This is my latest blog entry and the first official entry on the potential Blizzard of 2018, or Storm of the Century potential on January 3-5th 2018.  The first image is water vapor imagery taken as of this hour, it represents the different ebs and flows in our country.  Also it currently has three disturbances that will impact our storm potential this week.  The arctic disturbance is circled over NW Canada in a pink dot, the second disturbance is in red, the Pacific sh

USCAPEWEATHERAF

USCAPEWEATHERAF

 

Preliminary Snow thoughts for this Weekend and snow map

What I am thinking preliminarily right now for this weekend as ocean effect snow gives way to a northern stream (arctic jet stream) disturbance running through the flow amps a bit as it reaches the East Coast of the US and perhaps tries to tilt negatively for a time this Friday and Saturday.  There are many different disturbances in the flow this weekend that could turn something meager into a beast of a storm.  The runs this weekend of showing a monster hit are no longer showing this due to the

USCAPEWEATHERAF

USCAPEWEATHERAF

 

December 25th Christmas Snowstorm Snow Map Final Call

Here is the more detailed snow map for the final call, I added an 8-12" amount region and a special 12" amounts region for the mountains of NW ME and N NH.  I think some of the mountains in northern ME could see 12-18" of snow considering nearby arctic air mass and ratios.  Also I added a blizzard conditions possible area and a high wind 60mph+ gusts area, mostly the ocean northeast of CHH, but includes CHH and the Outer Cape Cod area.  This storm will bomb out as it develops over the Cape Cod C

USCAPEWEATHERAF

USCAPEWEATHERAF

 

2 or 3 Storms possible next week 25th through 31st

As of the 12z and 18z runs this morning and this afternoon suggest that we have three storm potentials this holiday week coming up.  With the NAO in flux, the PNA positive and the AO in flux, this is the best time to get snowstorms across the Northeastern US.  With the AO going negative long term and the PNA staying above neutral, we have a chance at transient ridges and shortwave amplification potential.  The first system is for Christmas Day, where an inverted trough/norlun trough bring accumu

USCAPEWEATHERAF

USCAPEWEATHERAF

 

Snowstorm in the future???????????????

Somewhere in the pattern fluctuations, there is the potential for a snowstorm for Mid Atlantic and the Northeast come next week, after Monday or maybe on Monday the 25th, Christmas day onward as an arctic air mass invades from the central us towards the East Coast.  Teleconnections support a three day period for a snowstorm on the coast from about the 24th to 27th that week.  The pattern evolves to support a +PNA/-NAO and -AO all line up for a coastal storm, it could be a big QPF producer and ma

USCAPEWEATHERAF

USCAPEWEATHERAF

 

December 13-14th Clipper Snowfall Map and Discussion

Thursday morning could bring our first snow fall accumulation of the season for Cape Cod and the Islands, a shortwave rounding the base of the H5 trough this evening will bring a shot of arctic air to the region where highs tomorrow and the rest of the work week will remain below freezing.  We now have a very potent vorticity max disturbance in the northern jet stream flow that will amplify some as it rounds the base of the somewhat negatively tilted trough over the Northeastern US.  Snow will b

USCAPEWEATHERAF

USCAPEWEATHERAF

 

Mid Week Potential Nor'easter Scenarios

There are two camps for the scenarios on the midweek storm potential for December 12-14th 2017.  I will illustrate them below.  Scenario One is a full blown Blizzard from NYC to BOS to Bangor, ME.  Scenario Two favors the Great Lakes and NNE with the heaviest snows.  Which one happens will be determined by jet dynamics, phase potential, and baroclinic zone potential placement as well as track of clipper and arctic shortwave troughs in the flow.  Scenarios are not forecasts, they are there to sho

USCAPEWEATHERAF

USCAPEWEATHERAF