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Central PA Autumn 2024


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11 minutes ago, Blizzard of 93 said:

Lol, I keep forgetting that the Euro comes out a little earlier & goes out 15 days now.

I know it’s way out in time, but it’s nice to see the GFS & Euro have the same general idea at this long range.

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The early December time frame has ensemble pattern support from the GEFS & EPS.

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7 hours ago, Blizzard of 93 said:

The early December time frame has ensemble pattern support from the GEFS & EPS.

To add to this, the EPO and WPO are both slated for a massive reversal to highly negative this week on the major ensembles… and staying negative out through the rest of their runs. That’s going with a generally negative NAO throughout as well. Only nitpick I really have is PNA staying mostly negative (GEFS eventually tries to get it positive).. which may weigh the cold air on the playing field in western Canada toward the western US at least initially. Either way, there is definitely a window of opportunity presenting itself from the last week of November into the opening week of December with what appears to be a decidedly more active pattern. 

I’m a bit late to the winter commentary in terms of thoughts on how things are going to go overall. Obviously the very highly negative PDO looms large with the gloomier aspects of our snow prospects. But what is not looming large is the ENSO. Forecasts in the spring for a moderate to strong Nina by this time of the year were much too robust and as of last week’s weekly ENSO report we still remain ENSO neutral (3.4 is at -0.3ºC). A stronger, established Nina coupled with the very -PDO state would have implied MJO spending a lot of time in the bad phases during the business end of winter. A neutral ENSO (or perhaps one that eventually transitions to a weak Nina) could present more favorability from the MJO realm.. at least at times. NAO blocking could be a wildcard too. 20-21 actually had the strong -PDO as well as a moderate Nina but that ended up being a decent winter here with the big hitters in mid December and beginning of Feb. There was a good bit of help from the NAO that winter.

So I’ll acknowledge we likely have more of an uphill battle for getting at least an average winter, but I’m going remain cautiously optimistic with low expectations. I’ll go out on a limb to say I think we have more opportunities overall than last winter setup wise… but whether we capitalize on them is another story. Scoring something right out of the gate next month would  certainly improve the prospects of respectable numbers for the winter. 

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Today will be our warmest day of the week with temperatures in the mid 60's for highs. We will turn slightly cooler tomorrow before a sharper change to colder by Wednesday night through the rest of the week. Our best chance of significant rain looks to arrive Wednesday night with as much as an inch in some lucky spots! Shower chances will continue through the end of the week, and we may even see some snow mixing in across some spots on Friday. Temperatures on Friday may not escape the 30's in higher locations.

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30 minutes ago, Mount Joy Snowman said:

Low of 41.  Some interesting weather ahead in the not-too-distant future.

yeah, I noticed it on the GFS late last week and almost called it out, but was worried it was a fluke, as I've been focused on other things.  Reading Bliz/Mag's post definitely raises ones eyebrow. 

Nice to see ENS runs showin the good stuff w/ troughing, and hoping that the neutral ENSO mutes the SER and we aren't full blown flamethrower here in the east.  PDO is and likely will always be the main driver of the tellies (winter wise...when it really counts), but fortunately there's always a few other ways to get the goods....or get screwed.  We've got screwed down pat, so here's to hoping we can find our way to some fun as the season approaches.  

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1 hour ago, mitchnick said:

6z Eps likes the chances of most to at least see flakes in the air, if not accumulations, over the next 6 days.

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retrograding ULL noted on nooner NAM's says upslope potential is real for snow belt folks.  While it is NAM's at range, they also have some global support, so its surely something to watch.  Only thing I worry about, it that we've been in a pattern of seeing things dry up as they transition from mid term, to near term model wise.  Fun to see all the same.

 

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Certainly the prospects for the first accumulating snowfall of the season look quite high for the higher elevations of western PA as well as the Poconos given progged evolution of that retrograding low. There’s some indications this could be a bit more prolific than a typical couple of inches at elevation type of first upslope snow event.

There’s two aspects of this event.. first the initial passage of a very vigorous shortwave that will be accompanied with hopefully a period of rain and then a strong frontal passage that could turn the mountains to some snow at the end Wed night into Thur. The second aspect is the carving out of a highly anomalous 500mb trough and closed low Fri/Sat which will set up a longer duration period upslope/LES as well as potentially some precip associated with the low itself as it meanders/retrogrades just north of C-PA. Main model difference at the moment appears to be thermals. Euro is warmer on the column overall by a few degrees than the GFS, which could be the difference between the Laurels seeing a few inches that is more elevation dependent within that zone (above 2k for example) and an upslope event that delivers a much bigger event to most/all of the Laurels as well as some elevation dependent accumulating snows that expand into the central counties with first flakes that are seen in most of C-PA. More certain is further south in the elevations of WVA, which almost double up the elevations of most of the Laurels. That is going to be a big upslope snow event down there. 

It’ll be interesting to see what happens, this type of setup has been somewhat rare as of late. The Laurel’s region of PA has had some of the highest % departure from average snowfall of anywhere else in PA the last several winters and a big part of that is from a lack of these NW flow/upslope setups.

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