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Feb 12-15 Upstate NY / North Country LES / Clipper Impacts


CNYWxGuy

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Alright, was initially going to wait for 0z runs to re-affirm what has been on the models for the past couple days before starting this thread, but couldn't resist as this is now T-7 Days out per most recent model cycle. In addition, despite the usual disagreement on track, intensity, and timing, the potential storm is on virtually every model, so I no longer think it's too early to begin discussing. Have at it!

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HPC...

EXTENDED FORECAST DISCUSSION

NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD

226 PM EST THU FEB 03 2011

VALID 12Z SUN FEB 06 2011 - 12Z THU FEB 10 2011

UPDATED PRELIM PROGS HAD INCORPORATED A HIGHER PERCENTAGE OF THE LATEST ECMWF MEAN INTO THE BLEND THAN THE EARLY PRELIM. WE LIKED THE IDEA OF THE NEW ECMWF MEAN SOMEWHAT WEAKENING NRN STREAM ENERGY VICINITY OF THE LAKES/NEW ENG DAYS 4-5...WHILE PLAYING UP MORE SIGNIFICANT TROFFING AT 500MB OVER THE W CENTRAL CONUS THAN THE REST OF THE GUIDANCE. 00Z/03 ENSEMBLE SPAGHETTI PLOTS SHOWED HIGH SPREAD WITH THE FOLLOWING MAJOR SHORTWAVE AFFECTING THE SRN PLAINS OR GULF COAST REGION NEXT THU/DAY 7.

THE NEW DETERMINISTIC 12Z/03 GFS SHOWS A DISTINCT TREND TOWARDS THE 00Z/03 UKMET/ECMWF SOLUTIONS BY TUE DAY 5...DROPPING A SHARPENING SHORTWAVE SSE ON THE E SIDE OF THE LONGWAVE RIDGE IN THE ERN PACIFIC. THE 12Z/03 UKMET/CANADIAN/ECMWF HAVE THIS FEATURE TOO...AND ARE ABOUT 12HRS SLOWER THAN THE CORRESPONDING 00Z/03 ECMWF RUN. THE NEW 12Z/03 UKMET/CANADIAN/ECMWF ARE SHARPER AND ABOUT 18HRS SLOWER WITH THE AZ TROF WED THAN THAN THE CORRESPONDING GFS....AND IN UNUSUALLY GOOD AGREEMENT WITH EACH OTHER. THE 00Z/03 ENSEMBLE MEANS OF THE ECMWF/GEFS/CMC ALL SHOWED THE POSSIBILITY OF A SHARPER TROF OVER THE GRT BASIN AND IT SEEMS TO BE PANNING OUT.

WE INCORPORATED NEW DETERMINISTIC MODEL TRENDS INTO THE FINAL GRAPHICS. A MAJOR SYS IS MORE LIKELY NOW ALONG THE GULF/SERN COAST THE MIDDLE/END OF NEXT WEEK...THOUGH THE DETAILS ARE STILL OBSCURE 6 AND 7 DAYS OUT. THE NEW ECMWF HAS TRENDED STRONGLY NWWD WITH A MAJOR STORM MOVING ACROSS THE SERN STATES THU DAY 7. AMIDST HIGH UNCERTAINTY...I WOULD NOT BE SURPRISED TO SEE SUBSEQUENT RUNS TREND EVEN FARTHER W WITH THIS STORM NEXT WEEK TOWARDS THE FAVORED LA NINA TRACK THRU THE OH VLY/WRN FOOTHILLS OF THE APPALACHIANS.

FLOOD

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HPC...

EXTENDED FORECAST DISCUSSION

NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD

226 PM EST THU FEB 03 2011

VALID 12Z SUN FEB 06 2011 - 12Z THU FEB 10 2011

UPDATED PRELIM PROGS HAD INCORPORATED A HIGHER PERCENTAGE OF THE LATEST ECMWF MEAN INTO THE BLEND THAN THE EARLY PRELIM. WE LIKED THE IDEA OF THE NEW ECMWF MEAN SOMEWHAT WEAKENING NRN STREAM ENERGY VICINITY OF THE LAKES/NEW ENG DAYS 4-5...WHILE PLAYING UP MORE SIGNIFICANT TROFFING AT 500MB OVER THE W CENTRAL CONUS THAN THE REST OF THE GUIDANCE. 00Z/03 ENSEMBLE SPAGHETTI PLOTS SHOWED HIGH SPREAD WITH THE FOLLOWING MAJOR SHORTWAVE AFFECTING THE SRN PLAINS OR GULF COAST REGION NEXT THU/DAY 7.

THE NEW DETERMINISTIC 12Z/03 GFS SHOWS A DISTINCT TREND TOWARDS THE 00Z/03 UKMET/ECMWF SOLUTIONS BY TUE DAY 5...DROPPING A SHARPENING SHORTWAVE SSE ON THE E SIDE OF THE LONGWAVE RIDGE IN THE ERN PACIFIC. THE 12Z/03 UKMET/CANADIAN/ECMWF HAVE THIS FEATURE TOO...AND ARE ABOUT 12HRS SLOWER THAN THE CORRESPONDING 00Z/03 ECMWF RUN. THE NEW 12Z/03 UKMET/CANADIAN/ECMWF ARE SHARPER AND ABOUT 18HRS SLOWER WITH THE AZ TROF WED THAN THAN THE CORRESPONDING GFS....AND IN UNUSUALLY GOOD AGREEMENT WITH EACH OTHER. THE 00Z/03 ENSEMBLE MEANS OF THE ECMWF/GEFS/CMC ALL SHOWED THE POSSIBILITY OF A SHARPER TROF OVER THE GRT BASIN AND IT SEEMS TO BE PANNING OUT.

WE INCORPORATED NEW DETERMINISTIC MODEL TRENDS INTO THE FINAL GRAPHICS. A MAJOR SYS IS MORE LIKELY NOW ALONG THE GULF/SERN COAST THE MIDDLE/END OF NEXT WEEK...THOUGH THE DETAILS ARE STILL OBSCURE 6 AND 7 DAYS OUT. THE NEW ECMWF HAS TRENDED STRONGLY NWWD WITH A MAJOR STORM MOVING ACROSS THE SERN STATES THU DAY 7. AMIDST HIGH UNCERTAINTY...I WOULD NOT BE SURPRISED TO SEE SUBSEQUENT RUNS TREND EVEN FARTHER W WITH THIS STORM NEXT WEEK TOWARDS THE FAVORED LA NINA TRACK THRU THE OH VLY/WRN FOOTHILLS OF THE APPALACHIANS.

FLOOD

if this tracks west then thats what we will have.

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Coming from a weather noob: This system looks to have potential because most of this winter season there were so many SW's that the models had trouble with how they would interact to eventually spawn a storm. In this case it seems pretty cut and dry...norther stream and southern stream...not much there to muck it up. Of course when the phase takes place has yet to be determined so discussing an exact track at this point doesn't make any sense. The only thing we can discuss is that it appears very likely there is going to be a large storm.

I hope our Canadian friends get in on the action, but not so much so that the CD goes above freezing.

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from nws buf

"PERHAPS THE MOST INTERESTING FEATURE COMES AT THE END OF THE

FORECAST...WHEN THE 00Z GFS/EUROPEAN/GGEM ALL LIFT A SIGNIFICANT

SURFACE LOW ACROSS NEW ENGLAND ON THURSDAY. WHILE THE GGEM IS

WEAKER...THE EUROPEAN/GFS BOTH ARE FORECASTING THIS LOW TO DEEPEN TO

AROUND 945 MB...VERY IMPRESSIVE IF THIS WERE TO VERIFY. CONSIDERING

THIS IS DAY 7...WILL NOT GET TOO WRAPPED UP IN DETAILS. CONSENSUS

AND CLIMATOLOGICAL TRACK WOULD KEEP MOST SIGNIFICANT IMPACTS OF THIS

SYSTEM TO OUR EAST EAST IF IT DOES DEVELOP. WILL ADJUST POPS TO

REFLECT THIS NEW MODEL CONSENSUS...AND CARRY A CHANCE OF SNOW FOR

THURSDAY. IF MODELS CONTINUE TO SUGGEST A SIMILAR SOLUTION...MAY

NEED TO ADD TO HWO...BUT AT THIS TIME THERE IS SIMPLY TOO MUCH

UNCERTAINTY TO HYPE THIS SYSTEM JUST YET."

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Well, with a slight northwest trend, you never know, Ottawa and Montreal might not do too badly. I'd love a storm like January 30,1966.

OB the most interesting part of this setup for you is that IF it occurs as a full on polar phase as currently modeled, it will likely unleash some serious cold, windchill and ground blizzard type stuff behind the storm.

thats as currently modeled.....of course that could change.

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OB the most interesting part of this setup for you is that IF it occurs as a full on polar phase as currently modeled, it will likely unleash some serious cold, windchill and ground blizzard type stuff behind the storm.

thats as currently modeled.....of course that could change.

:sun:

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Slick - hang in there SYR will likely bag one by emd of March...pattern becoming more favorable for us. The two in front of us look to be 2-5" jobs but after that more potential exists.

At least we have a pretty awesome snowpack right now. HUGE snow piles in parking lots also. Looks and feels like winter so I should be happy for that.

:popcorn:

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The biggest threat around this time frame (day or two later) is the potential clipper that is shown by most models..Gfs brings it down to around 992mb north of toronto..

Here's the 12z gfs qpf

Rather than start a new thread for this storm and seeing as how this thread is still young, will just go ahead and change the dates / subtitle. This is now a thread for the Sunday / Feb 13 Clipper...

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