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Winter Begins Jan 20th AWT


40/70 Benchmark

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47 minutes ago, MarkO said:

Para GFS looks like it could be northwest of GFS. I'm starting to be concerned for CNE, NNE

Mark,  we are fine up here.   CAD always overperforms in our neck of the woods.  Perhaps some IP but certainly no ZR.  Start time temp around 10F and dp 5F, just not going to see anything liquid.  I'm more concerned about how much qpf and ratios.  Good snow growth or needles.  This is really a post that should be in the NNE thread but wanted to respond with my thinking

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Basically the is a SWFE with a gulf connection, and an abnormally strong HP. This thing is flying across the country. Im betting the front end thump hits hard, and heavy snow develops soon after the first flakes fall. Im hedging on a Canal Cruiser. Or maybe even a bit further inland. Mitch to Dendrite in a strip that will be all snow and good accums. Sleet mixes all the way to Worcester. Im sitting at 38/35. Im guessing I go quickly to rain and see a quick temp spike as the Low passes close to my fanny.

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Just now, #NoPoles said:

Basically the is a SWFE with a gulf connection, and an abnormally strong HP. This thing is flying across the country. Im betting the front end thump hits hard, and heavy snow develops soon after the first flakes fall. Im hedging on a Canal Cruiser. Or maybe even a bit further inland. Mitch to Dendrite in a strip that will be all snow and good accums. Sleet mixes all the way to Worcester. Im sitting at 38/35. Im guessing I go quickly to rain and see a quick temp spike as the Low passes close to my fanny.

The fact that you're 38/35 right now doesn't mean much when it starts TOMORROW night. 

You barely sniff 30F tomorrow for the high.

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Just now, NorEastermass128 said:

Is this at all similar to what we saw on 12/16/07?  

Similar SWFE setup?  I got about 10" in Woburn when about 2-5" quickly to rain was forecasted.  We did eventually get into the U30s with that one...doubt those N of the Pike break 32F with this one though.

12/16/07 was a little different but it was the same idea with a stout arctic high. That one was actually just north of maine and slowly moving NE....this one is actually anchored better. The '07 storm though had the precip coming a bit more form the SSW and this one is more from the WSW. The forcing comes in at a bit of a different angle....the coastal front in this one will be pinned further SE due to the high position.

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Alot of premature negativity in here

We haven't given guidance enough time to declare this a clear (or final) trend. Maybe it will be correct, but at the moment I haven't seen anything to drastically change forecasts.

Our overall gestalt independent of models: this is an impressive High, the arctic air is fresh, and conversely this is not a phased super charged negatively tilted system charging in. I would anticipate a scoot east more than a GFS-esque track over Boston.

I actually thought UK, which has a scoot east, was still decent for SNE.

Regarding what has caused the NW track shift on the 12z suite so far...? Unclear. I've looked at 0 hr (12z) on GFS/NAM and compared to same timepoint of previous runs, suspecting that the ingest of the shortwave in the West might have shifted... but really not anything too glaring. Maybe the shortwave has ticked further north tracking over Nevada / Colorado. Maybe enough for the downstream ticks. But all within noise, and absolutely can trend in either way in the next 36 hours.

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4 minutes ago, ORH_wxman said:

12/16/07 was a little different but it was the same idea with a stout arctic high. That one was actually just north of maine and slowly moving NE....this one is actually anchored better. The '07 storm though had the precip coming a bit more form the SSW and this one is more from the WSW. The forcing comes in at a bit of a different angle....the coastal front in this one will be pinned further SE due to the high position.

Great response and explanation.  Thanks!

Seems like most should do well despite ticks NW here and there on current guidance.

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28 minutes ago, Hailstoned said:

AND it's a super moon; AND it's a full eclipse. Lot's of twists and turns ahead, and likelihood for memorable mayhem.

GFS low cloud tool has clouds thinning during the evening (when noticeable effects start just after 10 pm) and even out of here near totality. At least there's hope for that.

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27 minutes ago, Hailstoned said:

AND it's a super moon; AND it's a full eclipse. Lot's of twists and turns ahead, and likelihood for memorable mayhem.

Last full lunar here was spiked by cloud.  Unfortunately, I'd give it a 90%+ chance of happening again (though I'd take the extra snow.)
 

I agree on the discrepancy issue. GYX over predicts snow for southern NH especially in the area along the Merrimack Valley area in NE Mass.

Wait until tomorrow.  If the past is a predictor, the PM shift will probably knock totals back a few inches.

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