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December Forecast Discussion


Wow

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obs?

NWS Statement also backs obs.

GAZ033-042>044-052-053-101800-

1212 PM EST MON DEC 10 2012

...SIGNIFICANT WEATHER ADVISORY FOR 50 MPH WINDS IN CARROLL...

COWETA...DOUGLAS...HEARD AND FULTON COUNTIES UNTIL 100 PM EST...

AT 1210 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED

STRONG THUNDERSTORMS FROM WINSTON TO CENTRALHATCHEE...MOVING EAST AT

40 MPH.

WIND GUSTS OF 50 MPH ARE LIKELY AS THESE STORMS MOVE ACROSS

CARROLL...COWETA...DOUGLAS...HEARD AND FULTON COUNTIES THROUGH 100 PM

EST. SOME LOCATIONS IN THE PATH OF THESE STORMS INCLUDE FROLONA...

ROOSTERVILLE...CENTRALHATCHEE...WINSTON...LAKE VAL-DO-MAR...SEATON

LAKE...LOWELL...TREASURE LAKE...CLEM...ROOPVILLE...FRANKLIN...

FAIRPLAY...DOUGLASVILLE...PLANT WANSLEY AND BILL ARP.

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Yes but today was the first good pna I remember over the last week. You are right its always shown something past 360

I think it is the first run to show the plus pna but it continues with the west based - nao and connecting the nao block with the Aleutian block as it has for a few runs now. The 12z actually was run out of burger's basement and did one better. It hooked up those two blocks with the block that has been over Eurasia.

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I think it is the first run to show the plus pna but it continues with the west based - nao and connecting the nao block with the Aleutian block as it has for a few runs now. The 12z actually was run out of burger's basement and did one better. It hooked up those two blocks with the block that has been over Eurasia.

Yep it's a good one....now we gotta keep the look and have it show up at around 200 hours. We'll see how the Euro looks and the Euro ENS. Right now the Euro is out to 216 and has some cold air funneling into most of the Conus...no huge trough though just mainly seasonable.

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the ECMWF presents quite a blocky pattern by day 10.

post-38-0-97016500-1355177009_thumb.gif

The GFS first started showing some ridging around Greenland and eastern Canada a few days ago, valid at this time, so now it has support from the supposed almighty. Not to bash models, but a few days ago one thing that caught my eye in the longer range was the Atlantic cold vortex just southeast of Greenland and how large it was. It is probably going to help build or carve out the blocking ridge in and around Greenland, but so far it's not all that impressive. What it will do though is cause shorter wavelengths from the systems coming in from the West Coast in this strong -PNA pattern, so things will get pushed south and get jammed up on the East coast. You can see that on the operationals, but not the ensembles, so be looking for some wild swings on the operationals in coming days. The sky is the limit on p-types by early next week's storm. ECMWF has been inching ever more south and east with that storm, and by then could be using that strong Eastern Storm to create a new 50/50, which accentuates the blocky Canada/Greenland, meaning the next system also takes an even further south track.

It's an unusual flow and a very unusual alignment of indices coming up, so the models are playing catch up to the indices, rather than vice versa. Even with -PNA and -NAO coming up, there could be stormy conditions on both coasts, and we dont' see that much with just enough cold air to work with on some parts of the upper Southeast /Apps/East Coast.

I wouldn't be surprised to see the ECMWF make a really big deal of the East Coast storm early next week in future runs. The ensembles all have strong neg. anomalies here by then and decent blocking in Baffin Island, a climo good spot. Cold air will be at a premium south of I-40 but with the trends and models catching on to this possible 50/50 low and -NAO pattern, they could trend a little cooler, but probably not much. Depending on what happens with that early next week storm, the next storm could be very interesting as well, with a very strong -NAO pattern and 50/50 placed just right...storminess is definitely coming. So it's a far cry from last Winter with temps coming down to closer to average, as opposed to the upper 70s daily. Still think the Southeast will average above normal temps overall in most of the SE when December closes though, but the last of the month could be the polar opposite of the first of the month.

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You could see this model jump coming. When you see the AO numbers being so low and the models picking up on the destruction of the PV in the day 7-10 timeframe, it woudn't be long before a more classical blocking signal started showing up. The CFS2 now shows basically a 2010-11 pattern through the end of the run with no let up. After this sizable storm system that is likely day 7 or 8.

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You could see this model jump coming. When you see the AO numbers being so low and the models picking up on the destruction of the PV in the day 7-10 timeframe, it woudn't be long before a more classical blocking signal started showing up. The CFS2 now shows basically a 2010-11 pattern through the end of the run with no let up. After this sizable storm system that is likely day 7 or 8.

Good call too. Looks like going out on a limb for the Christmas forecast is paying off. Looking at the 18z that would be fun if it verified. While on the surface it's not spitting out snow thickness and 850's I think would be there.

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Good call too. Looks like going out on a limb for the Christmas forecast is paying off. Looking at the 18z that would be fun if it verified. While on the surface it's not spitting out snow thickness and 850's I think would be there.

Thx, but plenty of time for things to fall apart again lol. The models have been extremely volatile and I don't see any reason they won't continue until the blocking up in Canada/ Greenland actually sets up and changes the pattern.

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