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12/29 - New Years Storm Threat Discussion


Dsnowx53

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Missing a strong high to the north will again dumb it down though, those events are great when you have that high, we've been unable to get them the last few winters.

The antecedent airmass is cold enough though...I guess you would prefer a strong high to the north but even if we get a strong SWFE there would be plenty of moisture/etc available...so it'll work.

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The antecedent airmass is cold enough though...I guess you would prefer a strong high to the north but even if we get a strong SWFE there would be plenty of moisture/etc available...so it'll work.

The heights in SE Canada are really low. So we have great confluence, a good antecedent airmass, combined with some SE ridging and strong baroclinicity. I'm surprised the QPF isn't higher, based on the setup.

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00z GFS and 00z NAM have rain moving in a some point. 00z GFS starts off as snow, changes to rain, then back to snow. 00z NAM Starts out as all rain then changes to snow. Not really buying it since the global models haven't been doing well at all when it comes to determining ptype. GFS had us all rain for the Christmas event but we had snow for a good 50% of the storm. I'm hoping for a more amplified low but one that is not too close to the coast otherwise we'll get some mixing and change over and that will drop our totals.

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00z GFS and 00z NAM have rain moving in a some point. 00z GFS starts off as snow, changes to rain, then back to snow. 00z NAM Starts out as all rain then changes to snow. Not really buying it since the global models haven't been doing well at all when it comes to determining ptype. GFS had us all rain for the Christmas event but we had snow for a good 50% of the storm. I'm hoping for a more amplified low but one that is not too close to the coast otherwise we'll get some mixing and change over and that will drop our totals.

Um, looks like snow to me.

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00z NAM 4km High Resolution:

cld45.gif

00z GFS:

usaptypesfc045q.gif

I highly doubt there's much rain with this. This will be moving in during the morning, when there's presumably some cooling down to freezing or below immediately before, and there's not much mechanism to torch the boundary layer. Some of those P-type algorithms are crap to be honest. I can see perhaps it taking longer to stick near the coast but I doubt any warm layer is thick enough for rain (watch me eat those words).

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I highly doubt there's much rain with this. This will be moving in during the morning, when there's presumably some cooling down to freezing or below immediately before, and there's not much mechanism to torch the boundary layer. Some of those P-type algorithms are crap to be honest. I can see perhaps it taking longer to stick near the coast but I doubt any warm layer is thick enough for rain (watch me eat those words).

Agreed, but with a cold ground and favorable sun angles It should stick. (obviously not over subways and warmer areas of the city) luckily for me there are no subways to worry about.

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:facepalm: 2 inch storm. Better than nothing I guess.

Temper expectations, and you'll be much less disappointed when a storm like this inevitably can't produce due to a poor overall pattern. If there was a block to slow down the progressive flow, a phase would have been far more likely. Instead, the pieces of energy will stay separate until they are out in the Atlantic. At least we're getting something from one of the waves, and the models seem to be trending more intense with that one wave. Better than zero and cirrus clouds.

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Temper expectations, and you'll be much less disappointed when a storm like this inevitably can't produce due to a poor overall pattern. If there was a block to slow down the progressive flow, a phase would have been far more likely. Instead, the pieces of energy will stay separate until they are out in the Atlantic. At least we're getting something from one of the waves, and the models seem to be trending more intense with that one wave. Better than zero and cirrus clouds.

I think the pattern right now is a pretty decent one. I mean we are going to get accumulating snow this weekend with 1-2 more threats after that.

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