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Upstate NY/North Country + adjacent ON, QC, VT: End of Fall/Into Winter!


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Tonight might get quite interesting. I could definitely see this line of low topped convection being particularly nasty. A lot of very dynamic ingredients are in play.

Also, consecutive Christmas eves with severe thunderstorms. How absolutely crazy is that?!

A SUBTLE... YET IMPORTANT... FEATURE TO WATCH IS WHETHER A NARROW

BAND OF CONVECTIVE SHOWERS AND THUNDERSHOWERS CAN DEVELOP ALONG THE

COLD FRONT OR THE PRE-FRONTAL TROUGH EARLY THURSDAY MORNING... AS IT

MAY POSE A LOCALIZED STRONG/DAMAGING WIND THREAT. AS IS TYPICAL IN

THIS AREA... THIS STORM SYSTEM SETS UP A HIGH SHEAR-LOW CAPE

ENVIRONMENT AHEAD OF THE APPROACHING COLD FRONT. THE PARTICULARLY

INTERESTING PART IS THAT TEMPS ARE DEW POINTS WILL BE NEAR OR ABOVE

RECORD VALUES FOR THIS TIME OF YEAR... AND AS SUCH ANY NORMAL

CONCERNS FOR BEING ILL-TIMED FOR OPTIMAL DAYTIME HEATING ARE THROWN

OUT THE WINDOW. THE SHERB INDEX... WHICH IS A USEFUL DIAGNOSTIC

INDEX IN HIGHLIGHTING WHERE LOCALIZED CONVECTIVE SEVERE WEATHER MAY

OCCUR... GOES WELL ABOVE 1 ACROSS OUR FORECAST AREA ON THURSDAY

ALONG THE COLD FRONT WHERE A NARROW RIBBON OF WEAK INSTABILITY IS

FORECAST. THE STRONGLY FORCED NATURE OF THIS COLD FRONT PASSAGE...

ALONG WITH A WELL-ALIGNED STRONG SOUTHWESTERLY FLOW BEHIND THE FRONT

SUGGESTS THAT IF A CONVECTIVE LINE DEVELOPS IT WILL LIKELY BE

EFFICIENT AT DUCTING SOME STRONG TO DAMAGING WINDS TO THE SURFACE. A

FEW HIGH RESOLUTION MODELS ARE HINTING AT THIS LINE DEVELOPING...

INCLUDING THE NAMRR... WHICH GIVES SOME SUPPORT TO THE REASONING

OUTLINED ABOVE.

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12z models look pretty good for front end snow for next week's storm then LES later in the week a good possibility.  Hope things continue to hold serve or get even snowier.  Definitely looks better than a few days ago.

Good ol' lake cutter on the 18z goofus run.

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Someone kidnapped me and dropped me off in coastal Georgia. That's the only way I can explain just walking outside at 7PM and feeling the 60 degree muggy air. This sure as heck can't be Buffalo...

 

It really is incredible. KBUF broke the record today with a high of 61 and looks to break it even bigger tomorrow with highs near 65. Long range is looking better and better. Will post later, in the process of building a new PC. I'll post pics when I am done, its a beast!

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I just saw the latest GFS 00z run, and boy I wish I lived in the BUF southtowns, you guys are going to rock major league LES on the New Year, exactly New Year's Day.  GFS shows a band moving into BUF downtown region on New Year's Day, delta Ts will be exceptional, and snowfall rates will be excessive with thunder snow possible.  Instability will be threw the roof.  Just once I wish an OES event can sustain itself through 12 hours, we can't catch an OES event here on Cape Cod in over 20 years.  I mean one that dumps more than 4" on us.  I remember I was in grade school one day and 6" of fluff fell on Harwich and Chatham, MA and cancelled school for that day, that was the last 4"+ OES event I can remember.

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I just saw the latest GFS 00z run, and boy I wish I lived in the BUF southtowns, you guys are going to rock major league LES on the New Year, exactly New Year's Day.  GFS shows a band moving into BUF downtown region on New Year's Day, delta Ts will be exceptional, and snowfall rates will be excessive with thunder snow possible.  Instability will be threw the roof.  Just once I wish an OES event can sustain itself through 12 hours, we can't catch an OES event here on Cape Cod in over 20 years.  I mean one that dumps more than 4" on us.  I remember I was in grade school one day and 6" of fluff fell on Harwich and Chatham, MA and cancelled school for that day, that was the last 4"+ OES event I can remember.

 

I think we're getting a little ahead of ourselves but the first 2 weeks of January look great for LES. The lakes are just prime for some action, just need some arctic air and its coming.

 

gfs_T850_us_41.png

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First week of January on the Ensembles. This is the first time I've seen this since October...Very strong agreement from the 2 primary models. The GFS got an upgrade this year and the Euro is still the superior model so a blend of their ensembles is the best thing to use going forward IMO. Pretty strong ridge building in the west, exactly what we need to get some cold air across these lakes. I wish it was a little farther west than it is, but much better look.

pna.sprd2.gif

 

GFS:

 

gfs-ens_z500a_us_36.png

 

EURO:

 

ecmwf-ens_z500a_us_10.png

 

 

 

GEM:

 

gem-ens_z500a_us_37.png

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From the Buffalo AFD...

THE CIPS ANALOGS ALSO SCREAMING AT THE POTENTIAL FOR THIS TO BE A SIGNIFICANT WINTER SYSTEM FOR THE FORECAST AREA... ESPECIALLY IN THE FORM OF FREEZING RAIN ACROSS WESTERN NY. THE 12Z RUN OF THE CIPS ANALOGS OFF THE GFS GIVES A ROUGHLY 70 TO 80% CHANCE OF 1 OR MORE HOURS OF FREEZING RAIN ACROSS WESTERN NY... AND 60 TO 70% CHANCE OF 3 OR MORE HOURS OF FREEZING RAIN. THE MORE DISCONCERTING PART IS THAT THE TOP RATED ANALOG IS FROM JANUARY 31 2002... WHICH PROVED TO

BE A VERY SIGNIFICANT ICE STORM FOR WESTERN NY. THIS STORM SYSTEM WILL NEED TO WATCH EXTREMELY CLOSELY.

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January looking much better.

 

.CLIMATE...
WHEN CONSIDERING THE FORECAST THROUGH THE END OF THE MONTH...
DECEMBER 2015 STANDS A GOOD CHANCE TO BECOME THE WARMEST DECEMBER
ON RECORD IN WESTERN NEW YORK. CURRENT TRENDS SUGGEST THAT THE
MONTHLY AVERAGE TEMPERATURE MAY WELL TOP 40 DEGREES...WHICH PUTS
THE FOLLOWING RECORDS IN SERIOUS JEOPARDY...

WARMEST MEAN TEMPERATURE RECORDS FOR DECEMBER...

CITY TEMP YEAR
BUFFALO.....37.6 (1923)
ROCHESTER...39.0 (2006)

LOOKING A LITTLE FARTHER AHEAD...OUR LONG RUN OF RECORD WARMTH IS
ABOUT TO COME TO AN END WITH IMPORTANT CHANGES STARTING TO TAKE
SHAPE IN THE LONGWAVE PATTERN ACROSS THE NORTHERN HEMISPHERE.
SOMEWHAT COLDER AIR WILL BEGIN TO TAKE HOLD ACROSS THE NORTHERN
TIER OF THE UNITED STATES NEXT WEEK WITH SOME SNOW OPPORTUNITIES
HERE IN WESTERN NY. THIS WILL INITIALLY BE DELIVERED BY LOCAL...
RATHER SMALL SCALE CHANGES TO THE FLOW PATTERN DRIVEN BY SYNOPTIC
SYSTEMS.

AS WE HEAD INTO THE FIRST FEW WEEKS OF JANUARY...THE LONGWAVE
HEMISPHERIC PATTERN IS FORECAST TO ADJUST. THE PNA INDEX WILL FLIP
TO POSITIVE...WHICH WILL ALLOW A RIDGE TO BEGIN TO BUILD ALONG THE
WEST COAST AND FORCE A LONGWAVE TROUGH IN THE MEAN TO DEVELOP
ACROSS EASTERN NORTH AMERICA...DIRECTING MORE COLD AIR INTO THE
GREAT LAKES AND NORTHEAST. THE MADDEN JULIAN OSCILLATION /MJO/
WHICH HAS BEEN FAVORING VERY WARM TEMPS IN THE EASTERN US THIS
MONTH...WILL BEGIN TO ORBIT TOWARDS A MORE FAVORABLE PHASE FOR
COLD IN THE EAST BY THE MIDDLE OF JANUARY.

LASTLY...THE VERY STRONG STRATOSPHERIC POLAR VORTEX IS NOW UNDER
PRESSURE FROM UPWARD PROPAGATING ROSSBY WAVES...WHICH ARE FORECAST
TO WEAKEN THE POLAR VORTEX AND CAUSE AT LEAST SOME STRATOSPHERIC
WARMING OVER THE NEXT WEEK TO 10 DAYS. IT IS UNCLEAR YET WHETHER
THIS WILL BE A FULL FLEDGED SUDDEN STRATOSPHERIC WARMING EVENT...
BUT THE WEAKER STRATOSPHERIC POLAR VORTEX SHOULD ALLOW FOR MORE
HIGH LATITUDE BLOCKING TO DEVELOP AS WE GO THROUGH THE FIRST FEW
WEEKS OF JANUARY...WHICH SUPPORTS COLD INTRUSIONS INTO THE GREAT
LAKES AND NORTHEAST.

WITH THE ABOVE IN MIND...EXPECT A NOTABLE TURN TOWARDS MORE
TYPICAL COLD AND SNOW AS WE HEAD INTO JANUARY.

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