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January 7th/8th Storm Discussion


TauntonBlizzard2013

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3 minutes ago, ORH_wxman said:

The best part is the mid levels look excellent. Not far off from those good mesoscale model runs. 

The mid levels have always argued that we pay a little more attention, at least on the Euro. Seems like the good old US of A is finally coming around to the idea too.

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10 minutes ago, ORH_wxman said:

Changes becoming a bit bigger by 36h. This will be NW of 12z. 

Looks like a pretty good bump up in QPF compared to previous runs.

For Cape Cod: 0.27in tomorrow, 0.84in Saturday evening --> Potential for ~10 inches of snow to fall over the next 2 days

For Boston: 0.08in tomorrow, 0.46in Saturday evening --> with the likelihood of higher rations, perhaps a 4-6 inch snowfall

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Piggy backing off some of what Will and Ryan were discussing in the model mayhem thread earlier today, much of the ensemble sensitivity regarding a deeper, farther NW low pressure is derived from a sharper southern stream trof. There was really little signal in the PNA ridge, but a deeper northern stream or ridging in the Maritimes could do the trick too.

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11 hours ago, ORH_wxman said:

Those are the SREFs...take with many grains of salt.

 

It is certainly possible this ends up far enough west to give plowable snowfall into central regions of SNE if we get another tick at 00z like we did at 12z.

It's comical how bad they are now. You can always count on them to be amped and NW. They currently have warning snows all the way to John in Pittsburg.

Thank is nearly an unusable piece of guidance. No wonder Cliff Mass rails on wasted computer resources.

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24 minutes ago, TauntonBlizzard2013 said:

Maybe I'm crazy and overtired... but the whole setup definitey looks east on the NAM.

Doesnt look quite as strong ultimately either 

it did go a little east. But running the loop on the 4km NAM on TT, looks like the low jumps all around, following the convection or something

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The amazing thing is the GFS and Euro H5 pattern are nearly identical across the CONUS through 48 or so hours. Yet still produce differing results.

The only notable difference I see is that the Euro is a hair deeper with the southern stream trof, and maybe you could convince yourself the GFS is actually slightly higher with the PNA ridge. Which goes to show the ensemble sensitivity stuff is on the right track, as the small change in southern stream shortwave has a larger effect on the NW track than the better PNA ridge does.

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URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE TAUNTON MA 432 AM EST FRI JAN 6 2017 CTZ004-MAZ005>007-012>018-RIZ001>005-061745- /O.EXB.KBOX.WS.A.0001.170107T1200Z-170108T0700Z/ WINDHAM CT-CENTRAL MIDDLESEX MA-WESTERN ESSEX MA-EASTERN ESSEX MA- SOUTHERN WORCESTER MA-WESTERN NORFOLK MA-SOUTHEAST MIDDLESEX MA- SUFFOLK MA-EASTERN NORFOLK MA-NORTHERN BRISTOL MA- WESTERN PLYMOUTH MA-NORTHWEST PROVIDENCE RI- SOUTHEAST PROVIDENCE RI-WESTERN KENT RI-EASTERN KENT RI- BRISTOL RI- INCLUDING THE CITIES OF...PUTNAM...WILLIMANTIC...FRAMINGHAM... LOWELL...LAWRENCE...GLOUCESTER...MILFORD...WORCESTER... FOXBOROUGH...NORWOOD...CAMBRIDGE...BOSTON...QUINCY...TAUNTON... BROCKTON...FOSTER...SMITHFIELD...PROVIDENCE...COVENTRY... WEST GREENWICH...EAST GREENWICH...WARWICK...WEST WARWICK... BRISTOL

432 AM EST FRI JAN 6 2017

...WINTER STORM WATCH IN EFFECT FROM SATURDAY MORNING THROUGH LATE SATURDAY NIGHT... THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A WINTER STORM WATCH...WHICH IS IN EFFECT FROM SATURDAY MORNING THROUGH LATE SATURDAY NIGHT.

* LOCATIONS...EASTERN CONNECTICUT...ALL OF RHODE ISLAND AND EASTERN MASSACHUSETTS.

* HAZARD TYPES...ACCUMULATING SNOW.

* ACCUMULATIONS...SNOW ACCUMULATION OF 4 TO 8 INCHES ARE POSSIBLE.

* TIMING...SNOW DEVELOPS SATURDAY MORNING AND THEN OVERSPREADS THE ENTIRE REGION DURING SATURDAY AFTERNOON. THE STEADIEST AND HEAVIEST SNOW IS EXPECTED LATE SATURDAY AFTERNOON AND EVENING... THEN TAPERING OFF OVERNIGHT.

* IMPACTS...UNTREATED ROADS WILL BECOME SNOW COVERED AND SLICK. SNOW MAY BECOME HEAVY AT TIMES WITH VISIBILITY SEVERELY REDUCED. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WINTER STORM WATCH MEANS THERE IS A POTENTIAL FOR SIGNIFICANT SNOW...SLEET...OR ICE ACCUMULATIONS THAT MAY IMPACT TRAVEL. CONTINUE TO MONITOR THE LATEST FORECASTS. BE PREPARED TO MODIFY TRAVEL PLANS SHOULD WINTER WEATHER DEVELOP.

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