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January storm threat discussion #2


Ian

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GFS looks a little better for the Thurs-night-friday "event". Also portraying quite a rapid temp drop behind the front.

In these types of winters, you take any small victories. Dynamic cold fronts with sharp temp drops and strong winds with their passage are one of my favorite types of weather. A few snow showers make them even more exciting.

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In these types of winters, you take any small victories. Dynamic cold fronts with sharp temp drops and strong winds with their passage are one of my favorite types of weather. A few snow showers make them even more exciting.

Couldn't agree more, I've always been a huge fan of dynamic cold fronts, the opportunity for snow is just icing on the cake

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yes...I realize heights are too low to the west of the blocking and it may be transient and it is day 10 and the PAC sucks

post-66-0-17555200-1326351989.gif

Pretty bad, but not unexpected. Even a marginally improved Atlantic can't save this pig (too much else going wrong). January is lost---except for some cold over the next 7-10 days. In a couple of weeks, we can turn our attention to the evolving pattern for Feb and hopefully better times.

MDstorm

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GFS and its ensembles over the past 3 runs really weaken the PV to a little minuscule circulation during week 2, Euro now trying to do the same thing.

This upcoming warming could be the final blow but even so the -PNA ridge that helped initiate it could work against us for another 2-3 weeks before the pattern improves. But the deep spinning negative looks to leave east Canada finally

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By the looks of things, I am thinking that the back side burst of snow associated with the current system may be more impressive than I initially thoughti it would be.

500MB cut-off low is the wrong track for us (Western PA) so I wouldn't expect more than an inch or two, but by looking at the 12 hour radar loop, Snow really blossomed over the last few hours... pretty impressive. The 6Z NAM intializes the vort max over kansas. Has it centered over the IL/ KS border at hour 12. Given the current confirguration of the 500 MB Vort Max and extent of the Snow on the radar right now over IL. I am thinking that this sytem may be an over performer in terms of moisture output and give us a little more than expected on the SE side of the vort max track/ passage.

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I've watched those models for 6 weeks now and they are never right.

I'd agree that the predictions have been highly variable and erratic over the past six weeks, but the current position is accurate. I was alluding to the fact that it's not a good thing that it's in the COD and doing another "lap around the cul-de-sac" (ala zwyts).

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I've watched those models for 6 weeks now and they are never right.

Stolen from the mid range thread on the main page

The GEFS is terrible at forecasting the MJO. If you want to forecast the MJO using models, the ECMWF ensemble and weekly models are the only ones that have shown any skill beyond 1 week.

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I'd agree that the predictions have been highly variable and erratic over the past six weeks, but the current position is accurate. I was alluding to the fact that it's not a good thing that it's in the COD and doing another "lap around the cul-de-sac" (ala zwyts).

Stolen from the mid range thread on the main page

Agree with both of you. I was actually referring to the three models in that particular picture. Those have consistently shown the MJO to make significant progress into phase 7 and beyond (until recently), and they have consistently been way off. Seems that from what I've read here, the MJO isn't very easily forecast. I wasn't trying to make any prediction of my own, just that those three models don't seem to be the ones to hang a prediction off of.

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By the looks of things, I am thinking that the back side burst of snow associated with the current system may be more impressive than I initially thoughti it would be.

500MB cut-off low is the wrong track for us (Western PA) so I wouldn't expect more than an inch or two, but by looking at the 12 hour radar loop, Snow really blossomed over the last few hours... pretty impressive. The 6Z NAM intializes the vort max over kansas. Has it centered over the IL/ KS border at hour 12. Given the current confirguration of the 500 MB Vort Max and extent of the Snow on the radar right now over IL. I am thinking that this sytem may be an over performer in terms of moisture output and give us a little more than expected on the SE side of the vort max track/ passage.

I think it will be better than what one would think (a dusting up to .5") looking at the qpf maps only because of the decent ratios (-8C or colder from what I see)

otoh, with the wind blowing, it could easily evaporate quickly even if I'm right, and I don't have much confidence

I'll be asleep anyway, so I can always claim it snowed like he!! whether it did or not!

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If nothing else, 12Z GFS keeping it noticeably colder next week.

It actually gives us a snowstorm look at 216 hrs or so. It's much different with the siberian high and actually builds a new ridge over AK farther east than the old run. I'd wait for the ensembles to come in to see what they think but it does show that this pattern isn't that stable.

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It actually gives us a snowstorm look at 216 hrs or so. It's much different with the siberian high and actually builds a new ridge over AK farther east than the old run. I'd wait for the ensembles to come in to see what they think but it does show that this pattern isn't that stable.

...And something worth watching too after hr 324, but I guess I'm a :weenie: for commenting on anything that far into the future.

:-)

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It actually gives us a snowstorm look at 216 hrs or so. It's much different with the siberian high and actually builds a new ridge over AK farther east than the old run. I'd wait for the ensembles to come in to see what they think but it does show that this pattern isn't that stable.

Though it was a huge mess and knocked oit a lot of people's power... I would not mind a repeat of Jan 2011 snowstorm

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Though it was a huge mess and knocked oit a lot of people's power... I would not mind a repeat of Jan 2011 snowstorm

I'll take a repeat of that too - since it snowed more where I am now than where I was.... though the power outage thing I can do without.

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