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Weekend Storm Discussion 2/18-2/19


stormtracker

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This may be an obvious question here, but how much of our "fate" hinges on whatever front/northern stream going past initially? I recall the 12Z GFS had a killing low over Michigan which totally screwed things up for us, whereas the NAM (yes, 84 hours I know!) would have had the front through with the northern shortwave just before the southern stream system moved up...with decent high pressure in place. Similarly now, 00Z NAM pushes the northern vort through first. At least from my humble quick reading of this.

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This NAM run is not bad. It is as close to a snowy system as we have seen this season.

We have a LOW, we have some confluence to slow it down, there is a HIGH to the NW.

Sure, there will be BL issues but it doesn't appear wire to wire rain, either.

Agree, this is about as good a set-up as we've seen this entire season (which does not say much!). No guarantee but it's about the best we can look to right now. I mean, when's the last time we had a real system to follow (i.e., not snizzle or white rain)...late October??

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This NAM run is not bad. It is as close to a snowy system as we have seen this season.

We have a LOW, we have some confluence to slow it down, there is a HIGH to the NW.

Sure, there will be BL issues but it doesn't appear wire to wire rain, either.

assuming for the sake of argument the NAM's depiction of precip is correct, it's showing at 7AM the surface temps are above freezing

unless the precip falls hard, the BL will warm as the sun comes up

remember what happened Saturday before the arctic front came through? hit 40 or 41

tough way to run a winter

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assuming for the sake of argument the NAM's depiction of precip is correct, it's showing at 7AM the surface temps are above freezing

unless the precip falls hard, the BL will warm as the sun comes up

remember what happened Saturday before the arctic front came through? hit 40 or 41

tough way to run a winter

The 1000mb-500mb thickness chart has the 540 line positioned ala climatology,* i.e. where it

always seems to set up in marginal situations. Sure, Glen Burnie may struggle but north and

west of the cities may get in on some good snow.

*the usual disclaimer; 84 hr NAM; don't pay attention to individual features,etc.

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Low confidence prediction:

Models converge on a general track idea by 0z runs tomorrow night......

Then they slowly jog north and west on Friday and Saturday...

by Saturday afternoon models are printing out a general 0.5 - 0.75" for DC metro....

snow or qpf?

because it really could be either at this point

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I dont trust any model right now, but I lean heavily toward the euro and will continue to do so as long as it keeps a reasonable solution with some continuity...That said, it is entirely possible that the Euro is missing a phase that will bring the storm further north.....there wont be a consensus track til at least Friday.....and even after that there will be small shifts....FWIW, if the models show a track that fringes us I think that is ok....I expect that they will then jog north and west as the event nears.....I don't think we are going to get missed....

I agree and don't think we'll know but the NAmis not a bad solution. Too phased might give a GFS solution. It's a fine line the models have to tread. The northern shortwave has to get ahead of th esouthern one intially but not be so strong that it shoves the low track south. I wouldn't be surprised to see the Euro shift north tonight.

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