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February Forecast Discussion


REDMK6GLI

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I agree. The low level cold air will hold its ground as one wave or multiple shoot east.

 

attachicon.gifGZ_D5_PN_240_0000.gif

I agree. The low level cold air will hold its ground as one wave or multiple shoot east.

 

attachicon.gifGZ_D5_PN_240_0000.gif

The GFS is only a day later than the Euro next weekend with the fire hose and the GFS OP is colder so are the 0z euro and the 12z GFS ensembles

That's the pattern you and I discussed when we saw the JMA weeklies .

Lets see if the JMA can keep it s scorching hand.

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That's way too far out to pinpoint because the storm could easily disappear next run. Instead it's best to just look at the broad scope in this pattern. I'm surprised so many are moving past next week's potential.

Wolf just wrote some good reasoning why the mid week storm may still happen in the january discussion thread, go check it out bud ;)

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That's way too far out to pinpoint because the storm could easily disappear next run. Instead it's best to just look at the broad scope in this pattern. I'm surprised so many are moving past next week's potential.

If you've been following along you probably already know that it's been consistently showing up for the past several days. You almost never see an ensemble mean at day 12 with greater than 0.10"+ QPF contours concentrated like that in one general area. It's a big signal.

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Euro ensembles day 10 thru 14 are great. Day 15 is the same ole error , like the days before where the trough is now deeper

In the east this pattern goes on and on . NEG EPO. Upper latitudes are blocked deep trough in Europe

I didn't post the CFSV2 precip weeklies starting Feb 3 because they look too over the top . Suffice to say not gona be

Cold and dry no matter which model you look at .

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The overrunning coincides with the collapse of the PNA. Without a +PNA, you'll get disturbances crashing into the west coast which is great when you got the PV on your side and plenty of low level cold. I could see a train of disturbances to start February, perhaps one will occur during the SB?

 

http://www.cpc.ncep.noaa.gov/products/precip/CWlink/pna/pna.sprd2.gif

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The overrunning coincides with the collapse of the PNA. Without a +PNA, you'll get disturbances crashing into the west coast which is great when you got the PV on your side and plenty of low level cold. I could see a train of disturbances to start February, perhaps one will occur during the SB?

http://www.cpc.ncep.noaa.gov/products/precip/CWlink/pna/pna.sprd2.gif

It truly is an amazing pattern going forward. The -EPO ridge continues to build even though we lose the PNA. Everything up north looks blocked up with the -AO suppressing the vortex south. The pattern has overrunning potential writtenall over it. The Euro Ensembles look amazing.

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The GFS is going into its usual convulsions, lost the storm at its usual Day 5 lose the storm marker (which the 00Z CMC still shows BTW) and now advances the gradient pattern up 5-7 days.

In regards to the day 5 threat, hopefully that kicker is overdone on both models. I'm still not tossing in the towel. Last week taught me that lesson in this pattern.

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The NOGAPS has precip at 108 hours about 300 miles north of the GFS into central GA

That does raise an eyebrow...does it have any support yet? Maybe the NAm extrapolated? ( I can't believe the words "nam" and "extrapolated" came out of my mouth in the same sentence). Regardless there's still a threat to be watched. 72 hrs left until I give up..and 48 hrs until it has to show at least some improvements in trough axis and that darn kicker.

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That does raise an eyebrow...does it have any support yet? Maybe the NAm extrapolated? ( I can't believe the words "nam" and "extrapolated" came out of my mouth in the same sentence). Regardless there's still a threat to be watched. 72 hrs left until I give up..and 48 hrs until it has to show at least some improvements in trough axis and that darn kicker.

 

GFS ensembles will be useful, I normally was not so fast to toss the GFS this winter but this is now a classic pattern where the GFS tends to squash the crap out of things and it did with the last event to an extent too after showing it as a close miss initially beyond day 5....the fact the GEM got the last event before the other models too is of note.  The lack of a strongly -NAO or the PV at Day 4-5 not being THAT far south into Canada argues against a total suppression as the GFS shows.

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