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Dec 11-13 MW/Lakes/OV snow event part 4


Hoosier

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nam shows the 0 850 line race ahead of the precip line. Most of what falls in central and eastern OH should be frozen...or at least very quick changeover

Looks like somewhere between 30-33 hours it changes over for CMH. Surface temps are a little sketchy, but you should still score some snow.

http://68.226.77.253...NAM212_KCMH.txt

EDIT: this looks a lot better for you. http://68.226.77.253/text/NAMSFC/NAM_KCMH.txt

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We're trending toward it slipping along/just south of I-80 as it gets toward your area. I think that option is very much in play.

hmmm, i guess i'm going on current location and extrapolating not so much looking at the models, if the low keeps digging it might just be all systems go.

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How's it looking for Ottawa? Deluge of rain? EC is actually still calling for snow or freezing rain with a high of 32F. It would be nice t oat least see 4"

the problem over here on this end, is that no matter the sfc position, that punch of warm air at 800mb is still there. we needs the arc of the low track to physically change, ie dig.....to avoid the warm air intrusion from the SE up and over the low.

there is no chance of that happening in montreal but ottawa has a 10-20% chance of that working for them i'd say. its still 48 hours away from the crucial track point for us. each model run has been trending slowsly south and 'diggier' in response to the initialization conditions.

the ukmet at 12z actually pulled it off, keeping ottawa all frozen and mostly snow id say. the euro tried, but just failed for ottawa. the US models have been hideous for the whole region, but they too are subtly shifting.

as i said, id give it a 10-20% chance, which isnt much and is a longshot, but the next 6-12 hours as the low comes out of its formative stage, are critical.

even if not, i do still think that FRZRA will be the main problem for the ottawa valley.

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I don't like when he does that with the enhancement. I'm riding my 2-5 call from this morning, but will say heaviest north (less dryslot) and east (LE). 2" pre-dryslot and 3" in the defo band.

Just my humble opinion but I think you're too slow to react to the trends here. I'd be going big north of I-80. Even areas just south of there could make out pretty well depending on the exact track. I guess we really won't know for sure until the daytime...

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Just my humble opinion but I think you're too slow to react to the trends here. I'd be going big north of I-80. Even areas just south of there could make out pretty well depending on the exact track. I guess we really won't know for sure until the daytime...

You very well might be right. 0z NAM only puts out 4" or so, but it is creeping towards a much more robust solution held by the GFS/RGEM et al. I'm trying to stay consistent here, but it's getting hard. As i type, it doesn't look like the 0z GFS is giving up, but is much slower than 18z.

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This system is irritating the heck out of me...

6" from the system with 5" more from LE?

Problem is, with LE, it is not area wide coverage... the banding can leave some areas with a dusting and just a mile or two away, dump 3 or 4 "....

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OB,

RGEM through 0z Monday keeps you all snow but the mixture looks like it's rapidly approaching

It would be nice to get a few inches of snow before any changeover so we're not left with bare ground after the warmup. I know I keep mentioning it, but December 2008 keeps coming to mind. Snow was forecast to change to rain, but one model had Ottawa all snow, and it turned out to be right

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