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March or BUST! - Pattern & Model Discussion


Baroclinic Zone

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Just now, ORH_wxman said:

Note how the N stream is west and it's allowing the southern stream to try and curl up the east side of it....that is kind of a classic look in past biggies.

Yes it is, I like that it has shifted further west, Ridge out west was better too, You could see it early on.

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When looking at the upper air maps between the Ukie and Euro....Ukie has the northern stream a solid 100-150 miles W of the euro at 72 hours over Lake Superior.

 

That northern stream shortwave is currently just south of Alaska....it then takes a lonely journey over the Yukon and NW Territories before finally emerging over north Manitoba at the 48 hour mark at 12z Sunday....so this one could have some wrinkles given the path it takes. Maybe Chris has some insight on the sensitivity data...obviously the ridge out west is an important factor....perhaps more important than the northern stream shortwave itself. But don't be surprised if models don't handle this well because of how sparse the region is that the northern stream is navigating over the next 48 hours.

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4 minutes ago, rnaude241 said:

How big of a shift from 00z? 50-100 miles?

The precip shield probably jumped 200 miles NW from the 00z run looking at 96 vs 108....but this was caused by a mere 75 miles or so shift in the northern stream being west of 00z at 72 hours....so the changes early on get amplified later on the ground. I would say the ridge out west wasn't even quite as good as the 00z run so the position of the northern stream on this run is what was doing the leg work.

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