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January 30-February 2nd Wave Train


Chicago Storm

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0z ECMWF is coming a bit NW and possibly wetter.

 

Ended up a bit juicier but track ended up near identical to 12z.

 

I like it where it is but history so far this winter says it goes a lil bit back to the south. Which still works. Also the models have been way to quick to drop the PNA from + to - and this relates to the strength of the se ridge as a more -PNA typically means a stronger se ridge and thus storms tracking further nw.

 

pna.sprd2.gif

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nice model trends the last 24 hours...mixing will be knocking at my door step but i'm on the far northside and the lake is too cold to really do much damage, so i'm leaning all snow here.

 

LOT dropping significant/warning criteria wording in their latest afd in respect to amounts.

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Guess it's time to punt the next 3 days down here in the jungle. Maybe a stat padding 2-3" spread out from tonight through Saturday night, with some rain and slop thrown in for good measure.

 

Looks like ORD/DTW are once again in line for any appreciable accumulations, as has been the case most of the winter. Toronto might get a little love too.

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I'm pretty much in the sweet spot right now, but I'm also hoping for no more shifting.... I could be fine with a bit of a south shift on the gfs, but not on the NAM. The NAM has a nasty cutoff and anymore south and I could be looking at pixie dust.

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Looks like more ticks north from the models last night/overnight. No surprise. Maybe a few more moves north left to go. It does make this less of a wintry storm for LAF...and more of an eventual cold rainer. But, I think we'll get some front-end frozen/freezing action before surface temps shoot comfortably above freezing. And I don't buy any back-end switch back to wintry precip, as that very rarely works out. 

 

My Fri/Sat call for LAF: 1.0" of snow...0.15" of ice...0.50" of rain. Top out in the low 40's on Saturday.

 

Overall jackpot snowfall locations of 6-8"...central part of the QC - north central IL - western/northern Chicago suburbs - southeast WI - southwest lower MI - mainly north of DTW in southeast MI. 

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Ended up a bit juicier but track ended up near identical to 12z.

 

I like it where it is but history so far this winter says it goes a lil bit back to the south. Which still works. Also the models have been way to quick to drop the PNA from + to - and this relates to the strength of the se ridge as a more -PNA typically means a stronger se ridge and thus storms tracking further nw.

 

 

 

If you look at the raw numbers. The real value for the PNA today is .096. So we're at neutral now.

 

6z NAM

 

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Guess it's time to punt the next 3 days down here in the jungle. Maybe a stat padding 2-3" spread out from tonight through Saturday night, with some rain and slop thrown in for good measure.

 

Looks like ORD/DTW are once again in line for any appreciable accumulations, as has been the case most of the winter. Toronto might get a little love too.

 

Slop...yuck.  :flood:  I'm punting as well.  But hey...next week looks promising :weenie:  :sled:

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Guess it's time to punt the next 3 days down here in the jungle. Maybe a stat padding 2-3" spread out from tonight through Saturday night, with some rain and slop thrown in for good measure.

 

Looks like ORD/DTW are once again in line for any appreciable accumulations, as has been the case most of the winter. Toronto might get a little love too.

 

Even we're riding the riding the border here at this point.

 

Need about a 10-20 mile shift to the SE. Doable? Yes, but the trend is the opposite direction (including with the 06z runs).

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Forecasting storms based on indices is a little tricky. There's a response to individual storms. You can look back at past storms and see this in action. But, the overall regime has certainly changed...but that isn't news to anyone. Note again, the GEFS have been too low with the prediction of the PNA...but they are more reactive than proactive. 

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Forecasting storms based on indices is a little tricky. There's a response to individual storms. You can look back at past storms and see this in action. But, the overall regime has certainly changed...but that isn't news to anyone. Note again, the GEFS have been too low with the prediction of the PNA...but they are more reactive than proactive. 

 

 

good post

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