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Everything posted by Carvers Gap
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December 2020 Medium/Long Term Pattern Discussion.
Carvers Gap replied to John1122's topic in Tennessee Valley
Somebody remind what this does to the stratosphere and wx in general. Warm, right? Either way, very cool graphic...I mean really cool. -
December 2020 Medium/Long Term Pattern Discussion.
Carvers Gap replied to John1122's topic in Tennessee Valley
For kicks and giggles, the NAO on the EPS control run - always a red flag(but in this case, really red). -
December 2020 Medium/Long Term Pattern Discussion.
Carvers Gap replied to John1122's topic in Tennessee Valley
The CFSv2 has gone bonkers at 12z. Now, admittedly, it has never seen a cold pattern that it didn't like. But that is a very cold pattern through the end of its run on the Jan 23rd. No, I would never share a foxhole with this model, but wow. Most of NA is cold by the end of that run - NA just progressively gets colder. -
December 2020 Medium/Long Term Pattern Discussion.
Carvers Gap replied to John1122's topic in Tennessee Valley
So, I am going to throw this out there. I think there is a crap TON of uncertainty right now in the LR with possible splits of the SPV, -NAO, etc. EPS is showing a low getting hung up in the Four Corners in the LR. Sometimes that is a hint that the trough goes out West. Sometimes that is a false look and the trough comes East(more likely than not it comes East) - but not a given. However, with the big -NAO, the MJO looking like it may go into 7(HI RES GFS reference and EMON) at some amplitude....I think we are seeing the signal for a fairly strong EC storm beginning next week and for 2-3 weeks thereafter. The GEFS is the best look with a classic winter storm set-up. Going to depend on how much of a SER can nose underneath. I have been doing this a long time and am certainly fallible on most days, but if that vortex were to slip into the Aleutians with a block over Greenland...the PNA/EPO could pop, amplify a trough, and have the ensuing energy hit the Atlantic block. That isn't rocket science for winter storms, but the potential is there. I think the reason we see modeling going with big storms and losing them is that the potential is there. However, as a friend notes, the PAC is just blasting system after system into that Atlantic block. Nearly impossible to get timing right outside of 4-5 days. Interestingly, the GEFS which has never had the storm on M-T next week does have a weak surface low in the Piedmont. Probably a good time to look at ensemble low placements. Also, I am thinking some bitterly cold air is a high percentage bet at this time for NA during the next 2-3 weeks. Would not surprise me to see it drop into the northern Rockies or Plains and slide eastward. When BN height show up during the heart of winter in Canada, that is some COLD air. -
December 2020 Medium/Long Term Pattern Discussion.
Carvers Gap replied to John1122's topic in Tennessee Valley
Just looking at today's MJO...some changes there. Looks like the IO is about to go really quiet if the OLR maps on the CPC are correct. Wave propagates from the MC to phases 7-8 just west of the dateline which should correlate to MJO phases 7-8. 7 is colder the further that one goes into December. That might explain some of the changes on LR maps at this point. I think right now with some bitterly cold air moving into Canada, models are going to be hopping all over the place - just wrecks havoc on pretty much all modeling. -
December 2020 Medium/Long Term Pattern Discussion.
Carvers Gap replied to John1122's topic in Tennessee Valley
Well, I hope the GEFS is right in the long term. The trough retrogrades across northern Canada, through Alaska, and parks itself over the Aleutains...basically reverts into the same pattern that we just left. This time it would be later December and not early December. No idea if correct, but a nice look right after Dec 20th(no, I am not gonna say IT). -
December 2020 Medium/Long Term Pattern Discussion.
Carvers Gap replied to John1122's topic in Tennessee Valley
These days, the ensembles don't differ as much from the operational runs like they used to, IMO anyway. I think if we take the progressive nature of the GFS and the tendency to slightly overman by the Euro...there is a window now for a storm. Guessing models are having to sift through the various pieces of energy for the pattern. It does seem like confluence (at times) is over the lower MA next week. Have you seen the block on ensembles this morning? I never really buy that look (burned too many times), but it is getting kind of hard to ignore as it is probably being felt now in the mid-range by storms. Generally speaking, that block may well force phasing(more often than normal) of systems which are timed correctly. Anyway, modeling had a really stormy pattern about a week ago and then backed off. Looks to me like it is coming back to that potential, albeit a few days later than originally modeled. -
December 2020 Medium/Long Term Pattern Discussion.
Carvers Gap replied to John1122's topic in Tennessee Valley
They are for sure. Tellico, (and I haven't looked at the GFS closely) does the GFS look too progressive and have confluence too far to the East? Which model handled the last system(where it snowed) the best? -
December 2020 Medium/Long Term Pattern Discussion.
Carvers Gap replied to John1122's topic in Tennessee Valley
BNA, I missed this post earlier in the week. Yeah, pretty interesting to see the impressive blocking over Greenland on overnight ensembles and maybe winter storm potential as well. -
December 2020 Medium/Long Term Pattern Discussion.
Carvers Gap replied to John1122's topic in Tennessee Valley
Anything exciting happen with the overnight model runs? -
Fall/Winter Banter - Football, Basketball, Snowball?
Carvers Gap replied to John1122's topic in Tennessee Valley
Great start and then coasted home....but glad to have Tennessee basketball back. -
Fall/Winter Banter - Football, Basketball, Snowball?
Carvers Gap replied to John1122's topic in Tennessee Valley
John has it posted in the main thread. Great track. ICON had something similar. -
I think we are 37 as well. With that light breeze, still chilly. I have to go running later...just trying to wait for it to warm-up a hair.
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December 2020 Medium/Long Term Pattern Discussion.
Carvers Gap replied to John1122's topic in Tennessee Valley
Man, I really despise lows in the GL regions when tracking storms...they really screw-up all kings to potential. -
December 2020 Medium/Long Term Pattern Discussion.
Carvers Gap replied to John1122's topic in Tennessee Valley
That threat is not too far into the future. The 12z CMC and ICON especially have some threats. ICON is super similar to the Euro. Seems to be an wide range of solutions right after 120 with some of those begin wintry. -
December 2020 Medium/Long Term Pattern Discussion.
Carvers Gap replied to John1122's topic in Tennessee Valley
MBY has zip as well. Hey, it can only trend better. -
December 2020 Medium/Long Term Pattern Discussion.
Carvers Gap replied to John1122's topic in Tennessee Valley
The 12z GEFS and GEPS continue a very quick pivot of the pattern after d10. The 12z GEFS(very late in the run so beware) has a ridge in the West and a block over Greenland. GEPS has something similar with more ridging along the EC. These are fairly significant changes compared to the what has been advertised for many days. -
Temp is 34 in Kingsport with a slight breeze. WC is probably below 32. Pretty raw day.
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December 2020 Medium/Long Term Pattern Discussion.
Carvers Gap replied to John1122's topic in Tennessee Valley
Biggest thing I notice is that it is a real pain to get it to snow in Tennessee prior to the 15th of December. We have seen some early season, low-elevation snows during recent years...but really as a kid I never really expected it to snow until around or just after Christmas. Getting some great tracks with marginal or no cold. If we can keep that track(or have it re-develop) later this month or in early January, we would likely be in business. I would not rule out accumulating snow north of I-40 during the next couple of weeks across the forum area. Someone would have to thread the needle, but anytime a storm goes "under" us in terms of latitude during the winter months, it probably should be watched. -
December 2020 Medium/Long Term Pattern Discussion.
Carvers Gap replied to John1122's topic in Tennessee Valley
12z suite rolling. Taking a quick break from the virtual school grind.... Looks like the GFS, ICON, and CMC have low-road storm threats. The ICON(nice middle and west snow) and CMC both have something between 120-140h. GFS looks slightly too progressive. VERY active pattern - mostly rainers but some mix/snow stuff. -
December 2020 Medium/Long Term Pattern Discussion.
Carvers Gap replied to John1122's topic in Tennessee Valley
Major changes on the GEFS extended for early January. Fairly massive shift. This is the daily run of the extended GEFS which rolls about this time each evening for the model suite I subscribe to. @Holston_River_Rambler, do you have access to it? Check that...shift begins Dec 28 -
Spitting some salt and pepper size flakes here. Had some flurries and very light snow showers for about an hour or so. You can see the banding of those on the RadarScope image below.
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December 2020 Medium/Long Term Pattern Discussion.
Carvers Gap replied to John1122's topic in Tennessee Valley
Yeah, modeling seems to be feeling the presence of the NAO for sure. I am not ready to buy that feature quite yet as there has been a wicked bias towards that. However, we are long over due for a -NAO. Seems lately that the disruption of the SPV and -NAO go hand in hand...but seems like the NAO flashes and then disappears. So, we will see what happens. I was honestly surprised the Weeklies didn't look worse at 500. If they had run from 12z, likely would have looked even better. Again, lots of cutters and maybe some storms passing underneath if the block verifies. Seems like when the NAO shows up, it is often a fixture for most of winter...but ready to see it verify for a week or two before really believing staying power. IF(stress) that is a real feature, that should begin to create a feed(with the unfavorable PAC) into the norther Rockies which bleeds eastward at times. Not an exceptional winter pattern, but probably has the potential to be better than the last few winters. AN temps in January(provided they are slightly AN), can do the trick if timing is right. The NAO would provide for more confluence along the EC. Anyway, way out there...but worth a mention. Hey, it is early Dec...most years(prior to the last five winters) I really wouldn't expect winter wx until later this month or Jan. -
December 2020 Medium/Long Term Pattern Discussion.
Carvers Gap replied to John1122's topic in Tennessee Valley
The Weeklies seem to imply that the cold is going to push after initially going West. And that is extremely cold air in Alaska. When operationals start to bounce around usually some very cold air in NA...noticed both of those characteristics at 12z today. -
December 2020 Medium/Long Term Pattern Discussion.
Carvers Gap replied to John1122's topic in Tennessee Valley
I personally didn't think the Euro Weeklies looked terrible for 850temps(I never uses its surface temps...terrible warm bias) and 500 maps. The 12z EPS was quite a bit different. In the past few runs it has eliminated the ridging under neath and was quite close to opening the door for the air mass in AK to drop into the nation's mid-section. Will try to post more later.