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Jan 11-12 Model/Forecasting Discussion


Ji

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Antecedent cold air may mitigate any double barreled issue-- or it could just have a huge invert troff sticking up due to the diving SW out of the PAC nw--

With a closed 850 mb low over louisiana, the double barrel theory pretty much doesn't hold water. Buckeye needs that 850 mb low up over kentucky/west va for his ideas to pan out. That would be a huge change at this point.

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Has any model run shown that the leading southern storm is anything for us? Aren't we waiting for the Pac NW energy to get to us?

correct..all the models have this big time low really weakning after its sits there for a few days destroying the gulf coast until the PAC NW catches up. Maybe the NAM will be different

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No way. I won't ever root for some double-barreled BS with a jump. No way.

Usually h85 temps are not -12 down into NC. I'm not worried. It be a hell of a battle to change it over--which would be a DUMPING of snow before it changed. (massive WAA) Feb 5 last year-- I had 6 inches on that low that drove into southern WV before a change to sleet. h85 temps were .-4 when the event started.

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correct..all the models have this big time low really weakning after its sits there for a few days destroying the gulf coast until the PAC NW catches up. Maybe the NAM will be different

The 6Z GFS has that southern shortwave just NE of LA. At the same time, the NAM has it much stronger and back over Dallas (which I think would be much better for us in term of timing-interacting with the northern energy).

My hope of course is that the NAM is correct :-)

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Mission accomplished

Sry, but I'm still stinging from that last one and I can't be as gung-ho on this one yet. Not with the Euro being so different at this stage as well. I know what happened last time too with that. I like the pattern better and not having so many things to occur just right is better but we have seen a consistent pattern of suppressed storms. I hope this changes but until it does I am more cautious than ever now.

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Not trying to be mean but you've got to chill out with these posts. Between your post earlier about "locking in a SECS" and now posts like this...we had good consensus for other events this winter even within 48 hours and it failed. Could be the same here. Or have you already forgotten our failures this winter?

I'm giving you my opinion. Even HPC agrees this is a much easier storm to predict than anything we've seen this winter. You don't have to buy into what I'm posting if you don't want to.

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Sry, but I'm still stinging from that last one and I can't be as gung-ho on this one yet. Not with the Euro being so different at this stage as well. I know what happened last time too with that. I like the pattern better and not having so many things to occur just right is better but we have seen a consistent pattern of suppressed storms. I hope this changes but until it does I am more cautious than ever now.

there's nothing wrong with being cautious.. this storm still has a better chance to screw us than crush us

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I'm giving you my opinion. Even HPC agrees this is a much easier storm to predict than anything we've seen this winter. You don't have to buy into what I'm posting if you don't want to.

Also the post about locking in SECS was contingent upon Euro joining the consensus which has not occurred yet, so there is no "lock". Secondly 3-6 inches would be an SECS. Not like I'm calling for HECS or anything of that sort. Anyway, you can look historically inside 5 day range and probably find very good verifications when CMC/GFS/EURO/UKIE all had similar solutions at 5 days. It is rare though, but when it happens, most of the time we get a decent snowfall.

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GUIDANCE DIVERGES FROM DAY 5 TUE ONWARD. DUE TO THE

00Z ECMWF TRENDING SLOWER THAN CONSENSUS WITH ENERGY CROSSING THE

CONUS DURING THE PERIOD... THAT MODEL EJECTS THE INITIAL WAVE EWD

INTO THE ATLC AND THEN TAKES ANOTHER 1-2 DAYS TO DEVELOP ITS

STRONGER WRN ATLC SFC LOW THAT ENDS UP ON THE SRN FRINGE OF THE

MODEL/ENSEMBLE ENVELOPE. 00Z GEFS/12Z ECMWF ENSEMBLES SHOW BEST

CLUSTERING A LITTLE EWD OF THE 00Z GFS BUT THE GFS IS WITHIN THE

SOLN ENVELOPE AND THE UKMET/CMC TRACKS ALSO FALL IN THE MIDDLE TO

WRN HALF OF THE SPREAD. WITH ENSEMBLE MEANS OFFERING THE BEST

CONTINUITY AMONG GUIDANCE SO FAR... PREFER TO LEAN MORE TOWARD THE

00Z GEFS/12Z ECMWF MEANS WITH ABOUT 1/3 WEIGHTING OF THE GFS TO

PROVIDE SOME ADDED STRENGTH FROM DAY 5 TUE ONWARD. IT IS HOPED

THAT WITH A LARGER PROPORTION OF THE SUPPORTING ENERGY CROSSING A

MAJORITY OF THE CONUS VERSUS ENTERING THE CONUS FROM CANADA WHERE

MDLS HAVE MORE DIFFICULTY RESOLVING SHRTWV FEATURES... THAT THIS

SYSTEM WILL ULTIMATELY HAVE SOMEWHAT BETTER PREDICTABILITY THAN

PRECEDING SYSTEMS AFFECTING THE EAST COAST.

This is what the Euro did for the 12/26 storm (storm ... what storm?). It was too slow with the energy. In the case of this new storm (hopefully) it allows it to go OTS. Back in 12/26 it had it destroying us all because of its known bias of holding back energy in the SW for too long. I'd hate to use BIAS in the attempt at weenie casting but that bias was real last month. My thought is that the Euro might not have the right idea until that energy gets on shore. (Just like 12/26)

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This is what the Euro did for the 12/26 storm (storm ... what storm?). It was too slow with the energy. In the case of this new storm (hopefully) it allows it to go OTS. Back in 12/26 it had it destroying us all because of its known bias of holding back energy in the SW for too long. I'd hate to use BIAS in the attempt at weenie casting but that bias was real last month. My thought is that the Euro might not have the right idea until that energy gets on shore. (Just like 12/26)

the euro is not really holding back the southern energy as far as i can tell.

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I should've BOLDED the comments from HPC. They said it not I.

Edit: Fixed!

i guess late it does but that's not quiet the bias people quote on the euro. earlier in the cycle the euro is actually a little quicker with the wave than the gfs/nam it seems.

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i guess late it does but that's not quiet the bias people quote on the euro. earlier in the cycle the euro is actually a little quicker with the wave than the gfs/nam it seems.

I believe they are referring to the northern stream energy that is phasing with the southern stream on most other models. The Euro slows it down in the pac nw and therefore doesn't allow it to phase in time with the southern vort.

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I believe they are referring to the northern stream energy that is phasing with the southern stream on most other models. The Euro slows it down in the pac nw and therefore doesn't allow it to phase in time with the southern vort.

fair enough.. i actually only barely glanced at the euro. my main point was it's not necessarily the 'euro bias' at play here.

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