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Major LES event-December 24-27


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Don paul commented too

Even within the super fine tuning it becomes a very close call for North Buffalo versus South Buffalo, or even a brush with Kenmore and a part of Tonawanda. One run of the 3 km NAM even had it briefly brushing at least the southern part of Amherst for a few hours late Saturday morning. Oh well, at least the synoptic part of the storm worked out very well for the 8 WNY counties.

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13 minutes ago, BuffaloWeather said:

Don paul commented too

Even within the super fine tuning it becomes a very close call for North Buffalo versus South Buffalo, or even a brush with Kenmore and a part of Tonawanda. One run of the 3 km NAM even had it briefly brushing at least the southern part of Amherst for a few hours late Saturday morning. Oh well, at least the synoptic part of the storm worked out very well for the 8 WNY counties.

To me it sounds like Williamsville would be part of the airport area. Kenmore and that part of north Buffalo, west Amherst and Tonawanda would be too far NW. also when niziol poonts out he does say 245 to 265...245-250 is pretty much what gets it done here so now we wait Dev...

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4 minutes ago, wolfie09 said:

New map..

Jumped up a full inch lol

StormTotalSnow (3).png

Yeah I was about to post this. For WNY, this went from a major event with a strong chance of significant residence time in the Buffalo metro to a mediocre LES event mostly limited to southern Erie County that would probably merit two stars out of five — at best — on the KBUF storm summary.

Getting five inches of paste just in time for Christmas morning was nice, but I’m just about ready to move on.

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6 minutes ago, WNash said:

Yeah I was about to post this. For WNY, this went from a major event with a strong chance of significant residence time in the Buffalo metro to a mediocre LES event that would probably merit two stars out of five — at best — on the KBUF storm summary.

Getting five inches of paste just in time for Christmas morning was nice, but I’m just about ready to move on.

Yeah losing some hope off Erie.  Still that’s why I love it... You never really know what’s exactly gonna happen and there’s always the chance for a surprise.  

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She’s off and kicking... Gotta start seeing a shift north in next few hours or we’re just gonna end up with a sweeper that dumps 3-4” on its trip north and then another 2-3” in its way back south.  


 

Special Weather Statement
National Weather Service Buffalo NY
545 PM EST Fri Dec 25 2020

NYZ012-019-020-085-260030-
Chautauqua-Cattaraugus-Southern Erie-Wyoming-
545 PM EST Fri Dec 25 2020

...A BAND OF LAKE EFFECT SNOW WILL AFFECT SOUTHERN WYOMING...NORTHERN
CATTARAUGUS...SOUTHERN ERIE AND CENTRAL CHAUTAUQUA COUNTIES...

At 540 PM EST, a band of lake effect snow producing snow fall rates
around an inch per hour is located from near Ripley to South Dayton
to Arcade on the southern flank, and from near Angola to Hamburg to
East Aurora on the northern flank. This band of snow will remain
nearly stationary this evening.

Winds in excess of 30 mph are possible with this band of lake effect
snow creating blowing snow. A rumble of thunder is also possible
within the most intense portion of the band of snow.
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That has been the theme over the last several years though.. :ee:

4 minutes ago, SouthBuffaloSteve said:

She’s off and kicking... Gotta start seeing a shift north in next few hours or we’re just gonna end up with a sweeper that dumps 3-4” on its trip north and then another 2-3” in its way back south.  


 


Special Weather Statement
National Weather Service Buffalo NY
545 PM EST Fri Dec 25 2020

NYZ012-019-020-085-260030-
Chautauqua-Cattaraugus-Southern Erie-Wyoming-
545 PM EST Fri Dec 25 2020

...A BAND OF LAKE EFFECT SNOW WILL AFFECT SOUTHERN WYOMING...NORTHERN
CATTARAUGUS...SOUTHERN ERIE AND CENTRAL CHAUTAUQUA COUNTIES...

At 540 PM EST, a band of lake effect snow producing snow fall rates
around an inch per hour is located from near Ripley to South Dayton
to Arcade on the southern flank, and from near Angola to Hamburg to
East Aurora on the northern flank. This band of snow will remain
nearly stationary this evening.

Winds in excess of 30 mph are possible with this band of lake effect
snow creating blowing snow. A rumble of thunder is also possible
within the most intense portion of the band of snow.

 

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7 minutes ago, BuffaloWeather said:

Heavy snow in colden. Band should start moving slowly north next few hours into the overnight. Wasn’t predicted to be near Buffalo until around noon tomorrow. Not sure what you guys expected. Whatever it was, it wasn’t modeled. Just hope the models were wrong. 

C6B411A7-1E45-4FC8-8544-6FD85415ED91.jpeg

Then why did the lake effect snow warning go into effect at noon today? Seems silly if nothing is expected for 24 more hours. 

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12 minutes ago, lakeeffectkid383 said:

Then why did the lake effect snow warning go into effect at noon today? Seems silly if nothing is expected for 24 more hours. 

Agreed. To me they really didn’t have a handle on timing or position of the band. If we don’t score on this one there’s always the New Year’s Eve replica storm...

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3 minutes ago, wolfie09 said:

Yeah at first buffalo was calling for a SW flow this evening with 2" an hour rates because that's what guidance showed, unfortunately things change quick when it comes to lake effect.. Time for nowcasting anyway lol

Where?

This is the forecast discussion from this afternoon. No mention of SW winds. SW winds haven't showed up in models in 3 days.

Erie

Northwest flow this morning will back to the west by midday,
allowing multiple bands to develop from northeast Ohio into the
western Southern Tier of NY, with some upslope enhancement along the
Chautauqua Ridge. This will remain the mode of lake effect through
mid to late afternoon. By early this evening boundary layer flow
will be backing to the WSW, which will allow for a single band to
consolidate along the Lake Erie shore of Chautauqua County into
southern Erie County. This band will then move north towards the
Buffalo southtowns and southwest Genesee County by late evening as
boundary layer flow continues to back to the southwest. Some high-
res guidance suggests a brief southward drift back into southern
Erie, western Wyoming, and Chautauqua counties after midnight before
the band moves back north to Buffalo again by Saturday morning. The
band will reach its northern-most point late morning to early
afternoon Saturday into the city of Buffalo and even the nearby
northern suburbs before starting to drift back south across the
southtowns late in the afternoon. Lowering inversion heights,
decreasing moisture, and increasing shear will allow the band to
weaken during the afternoon.

Snowfall rates will occasionally reach 2 inches per hour in this
band of lake effect snow from this evening through midday Saturday.
Total accumulations of 15-20 inches are still likely where the band
persists the longest from western Chautauqua County, the northwest
corner of Cattaraugus County, into southern and central Erie County
including South Buffalo and the densely populated nearby southtowns.
6-12 inches are possible from downtown to the airport and the nearby
northtowns if the band makes it that far north Saturday, with a very
sharp drop off in accumulations heading northward through the
northtowns.
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Just now, BuffaloWeather said:

Where?

This is the forecast discussion from this afternoon


Erie

Northwest flow this morning will back to the west by midday,
allowing multiple bands to develop from northeast Ohio into the
western Southern Tier of NY, with some upslope enhancement along the
Chautauqua Ridge. This will remain the mode of lake effect through
mid to late afternoon. By early this evening boundary layer flow
will be backing to the WSW, which will allow for a single band to
consolidate along the Lake Erie shore of Chautauqua County into
southern Erie County. This band will then move north towards the
Buffalo southtowns and southwest Genesee County by late evening as
boundary layer flow continues to back to the southwest. Some high-
res guidance suggests a brief southward drift back into southern
Erie, western Wyoming, and Chautauqua counties after midnight before
the band moves back north to Buffalo again by Saturday morning. The
band will reach its northern-most point late morning to early
afternoon Saturday into the city of Buffalo and even the nearby
northern suburbs before starting to drift back south across the
southtowns late in the afternoon. Lowering inversion heights,
decreasing moisture, and increasing shear will allow the band to
weaken during the afternoon.

Snowfall rates will occasionally reach 2 inches per hour in this
band of lake effect snow from this evening through midday Saturday.
Total accumulations of 15-20 inches are still likely where the band
persists the longest from western Chautauqua County, the northwest
corner of Cattaraugus County, into southern and central Erie County
including South Buffalo and the densely populated nearby southtowns.
6-12 inches are possible from downtown to the airport and the nearby
northtowns if the band makes it that far north Saturday, with a very
sharp drop off in accumulations heading northward through the
northtowns.

Do you really want me to go back and get the previous discussion? Lol When they started putting watches out.. You posted it lol

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On 12/23/2020 at 9:55 AM, BuffaloWeather said:

Not sure if posted yet, updated FD from KBUF


...Heavy Lake Effect Snow Possible Christmas through December
26...

For Friday morning, there should be a brief transition from
ending synoptic snow moving into Central NY and developing lake
effect snow developing on a WSW flow over the lakes. The coldest
aloft will still be upstream and poised to move overhead later
Friday afternoon. So there may be a period Friday morning with a
meager lake response before a full-blown lake response takes
hold. As a result, there`s still quite a bit of uncertainty to
both the start time and placement of lake effect snow.

East of Lake Erie...some models move the band well into the
Northtowns while others place it toward Metro Buffalo Friday
afternoon. Regardless, the coldest airmass should pass overhead
Friday evening and mark the period for the heaviest and most intense
lake effect snow, where 2"/hr and thundersnow will be a possibility
into Friday night as the band settles a little to the south
overnight.

East of Lake Ontario...a similar transition period is expected, with
widespread snow tapering off Friday morning...followed with a lake
response Friday afternoon. The most intense period should be Friday
night and well into Saturday.  Similar to Lake Erie however, there`s
still uncertainty placement at this point through Saturday.  The
best chance will probably be over/north of the Tug Hill Plateau.
Then another shortwave trough will move across the St Lawrence
valley and should push the band south over and eventually south of
the Tug Hill Plateau.

With concerns noted above, the watch will stand for now until
there`s more confidence in timing and placement along with
corresponding snow amounts.

Here is from a few days ago. Seems like they were not sure as multiple models had different wind directions. Euro never went SW only W/WSW. Kind of states that in the discussion.

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Tom Niziol on Facebook:

Snowband is pasting southern Erie county now as well as Wyoming county. I am guessing snowfa;l rates of 2+ inches per hour. Send reports !! I am thinking it still mobves right to the edge of Buffalo as the night progresses then meanders south and north once again tomorrow before heading to the Southern Tier later Saturday night.

 

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9 minutes ago, wolfie09 said:

Do you really want me to go back and get the previous discussion? Lol When they started putting watches out.. You posted it lol

The thing is with watches. Northern Erie county is quite a distance. West Seneca is included in Northern Erie county and so is Tonawanda. They don't issue watches by city or town. West Seneca is going to get hit tonight, Tonawanda isn't. Its the same with southern Erie County. Orchard Park/Hamburg are considered Southern Erie county. You know how many times lake snow warnings are in effect for my area and I get nothing, about 70% of the time. It's not KBUFS fault, it's just how they generalize forecasting. Ideally they should seperate Erie county into 4 sections. Northtowns/City/Southtowns/Hills to the SE.

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.

East of Lake Erie...some models move the band well into the
Northtowns while others place it toward Metro Buffalo Friday
afternoon. Regardless, the coldest airmass should pass overhead
Friday evening and mark the period for the heaviest and most intense
lake effect snow, where 2"/hr and thundersnow will be a possibility
into Friday night as the band settles a little to the south
overnight.
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