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January 26-27 Snowstorm Disco VI


ConvectiveSolutions

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It was the NAM that first indicated a day or so ago that we'd see a big moisture split off the Carolinas. As it came into focus the RGEM jumped on board and eventually the GGEM too. By this morning it was only the UK and EURO that were stiill hanging on, but the Euro had backed down from the HECS from last night. The NAM has moved around some, but it's been steadfast in this being a storm for SNE. The Meso's appear to have done pretty well based on all this, the globals lost so far.

The NAM had the right idea, but not always the right expression of the idea.....in the end drying, multiple s/w's and therefore an elongated low.

Yeah I was plugging a close to the coast track 2-3 days ago but once I saw the RGEM was much more subdued than the GGEM I realized the mesos were catching onto some convection the globals, especially the ggem, were missing. There's a hilarious 3am post of me on here two nights ago when I realized the RGEM was way weaker/south of the GGEM at 48 hours.. that was sort of the moment of realization for me that this might have convection issues and that I was going to be totally wrong.

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you have look at where the heavy snow bands form and set up . They have many times set where models didnt show them and likely further north west of where the models show them . most storms this winter had more snow than forecast by models . you have look where the low is forming too .

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you have look at where the heavy snow bands form and set up . They have many times set where models didnt show them and likely further north west of where the models show them . most storms this winter had more snow than forecast by models . you have look where the low is forming too .

You do have a point.....we have seen often times that there will be a secondary maxima in association with the outter deformation band, where relatively paltry QPF was modeled....the only thing is that this is no longer a bomb....it's a strung-out crack wh**e.

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i disagree with that not a bomb and even some weather people say it is still like guy from new york city that i listen too he looks at the weather pattern not just models ,

We'll see what happens....will be fun to watch.

I'll expect 4" and hope for 8".

I think 3-8" will be my final call.

BTW, Bob is to start ALL storm threads from now on. :axe:

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The 6z NAM is a huge improvement for most of us. At least that means the far SE solutions that basically nearly completely miss SNE aren't going to happen. Basically in agreement with the GFS, actually a little better for SE areas.

Upped me from .4" to .9"

HFD from .2 to .5

I still think this storm is going to trend much farther NW; the 6z NAM closes off the H5 and H7 lows, and the 7z RUC keeps the surface low tucked into the NJ coast. Looking at the radar, there's clearly overrunning precipitation that has a good shot at making it to NYC metro by daybreak, contrary to what the 6z NAM and 0z GFS showed, where the banding stalled out and died over Northern Virginia.

I'm sticking to my 8-14" call for Westchester despite the recent QPF reductions from some modeling. Models always have a tendency to reduce QPF the night before a storm; it happened in the Boxing Day Blizzard and the 1/12 Miller A, and then we got crushed. The NW trend is in effect this season, so I'm watching this one carefully. We're talking about a juicy Miller A Gulf Low, it's not going to give you .3" QPF...

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I still think this storm is going to trend much farther NW; the 6z NAM closes off the H5 and H7 lows, and the 7z RUC keeps the surface low tucked into the NJ coast. Looking at the radar, there's clearly overrunning precipitation that has a good shot at making it to NYC metro by daybreak, contrary to what the 6z NAM and 0z GFS showed, where the banding stalled out and died over Northern Virginia.

I'm sticking to my 8-14" call for Westchester despite the recent QPF reductions from some modeling. Models always have a tendency to reduce QPF the night before a storm; it happened in the Boxing Day Blizzard and the 1/12 Miller A, and then we got crushed. The NW trend is in effect this season, so I'm watching this one carefully. We're talking about a juicy Miller A Gulf Low, it's not going to give you .3" QPF...

and that i believe is what is the key to the boom/bust models outputs

we need this to close off at h5 and h7 and then we got a shot for some high totals........just give the banding a chance.

weenies are lining up to go diving in the river with cement boots on........nope Fook the "king" crapping the bed. stick to your guns.

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and that i believe is what is the key to the boom/bust models outputs

we need this to close off at h5 and h7 and then we got a shot for some high totals........just give the banding a chance.

weenies are lining up to go diving in the river with cement boots on........nope Fook the "king" crapping the bed. stick to your guns.

Exactly...QPF is the least stable parameter for the models to predict, so you have to take it with a grain of salt. Just 24 hours ago, the ECM showed 1.75" of QPF in NYC, which has now been cut to .75"...this drastic of a change makes little sense given that the system's track hasn't changed much at all. Additionally, the 6z NAM shows a closed 500mb low directly SE of NYC moving towards SNE, which is a signal for heavy deformation banding. While I think 1.75" QPF is a stretch given how fast the system moves, I could easily see 12" amounts in this area and SNE given the set-up. Big Gulf Lows rarely disappoint, and the first batch of precipitation looks to be making a beeline north.

This is why I'm sticking to my guns.

At this point I could care less if we got a foot or not even a flake. This whole week of model watching was just a big waste of time.

EPIC FAIL EPIC FAIL EPIC FAIL

GROTESQUE

I WONDER IF THIS IS HOW THE EPIC WINTER STARTS TO UNRAVEL LOL

Why? The storm hasn't happened yet.

And it's all a learning experience anyway. The more storms you see play out, the better prepared you are to understand how a given situation will verify and how these Nor'easters work. It's a cool process given the connection between the H5/H7 levels and what banding occurs at the surface. So it's not all about the final total, which isn't decided anyway.

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did ukie and ggem crap the bed.....? cause that is what the ncep was riding they tossed the euro last evening anyway

hot off the press

MEANWHILE SFC LOW PRES

CURRENTLY ORGANIZING OVER THE SOUTHEAST WILL REORGANIZE JUST OFF

THE SRN MID-ATL COAST THIS MORNING AND ADVANCE RAPIDLY NNEWD UP

ALONG OR JUST OFF THE MID-ATLANTIC THIS AFTERNOON AND

TONIGHT...BEFORE THEN MOVING MORE NEWD OFF NEW ENGLAND AND TWD THE

CANADIAN MARITIMES BY EARLY THU. ALREADY DEEP MSTR TRANSPORT AND

STG WARM ADVECTION COUPLED WITH INCREASINGLY DIV FLOW ALOFT IS

YIELDING AN EXPANSIVE SHIELD OF PCPN INVOLVING THE MID-ATLANTIC

AND CNTRL/SRN APPALACHIANS. ALREADY SEEING A DEFORMATION

ZONE/COMMA-HEAD FEATURE WITH MORE DYNAMICALLY ENHANCED PCPN

OCCURRING BACK INTO THE TN VLY AS THE OVERALL SYS CONTINUES TO

AMPLIFY/DEEPEN.

AGAIN...A VERY TRICKY SNOWFALL FORECAST WITH THIS SYS AS THERE IS

EXPECTED TO BE JUST ENOUGH COLD AIR IN PLACE ACRS THE CNTRL

APPALACHIANS AND ALSO THE INTERIOR OF THE CNTRL/NRN MID-ATLANTIC

AND EASTERN NEW ENGLAND FOR HVY SNOW WITH THIS EAST COAST STORM.

GIVEN ALL OF THIS...HPC

SUGGESTS A CORE SWATH OF 6 TO 10 INCHES ALONG AND WEST OF

I-95...WITH LESSER AMTS IN A TIGHT GRADIENT JUST TO THE SOUTH AND

EAST. LOCALLY HEAVIER SNOW IS POSSIBLE OVER PARTS OF THE CNTRL

APPALACHIANS DUE TO OROGRAPHICS/UPSLOPE...AND ALSO INTO PARTS OF

COASTAL NEW ENGLAND WHERE SOME ADDITIONAL ATLANTIC MSTR FETCH MAY

LOCALLY ENHANCE TOTALS.

AWT.

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