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Saint Patrick's Day Snow Event II


stormtracker

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heh...GMTA....was just going to say same thing

I'm sorta concerned we'll never get good rates with good temps.. or good rates at all.  But maybe the Euro will look nice.

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Keep an eye on dew points tomorrow.   The NAM has dew points (dotted green in top panel) dropping early in the morning into the upper teens and then settling around 20.    This, combined with a high of only 40, allows for good evaporative cooling as the precip arrives.    And of course, ignore the silliness this shows for Tuesday….

 

724050.meteogram.gif

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the models could go drier and further south tomorrow...there still a good 18 hours for this thing to further deteriorate

My bar is set appropriately low at least. 0.5" is a win. ;)

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Keep an eye on dew points tomorrow.   The NAM has dew points (dotted green in top panel) dropping early in the morning into the upper teens and then settling around 20.    This, combined with a high of only 40, allows for good evaporative cooling as the precip arrives.    And of course, ignore the silliness this shows for Tuesday….

 

724050.meteogram.gif

 

Thanks for posting, but I think we know the NAM isn't going to be close to right with temps...it has me 38 degrees in 1 hour...it is now 50....the idea that immediate DC metro is going to be 32-33 at 8pm tomorrow is absurd....

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I was surprised with late March last year. It doesn't take a ton to get a good burst that helps you perform.  This is the time of year I'm most likely to bust as I can never fully punt climo likelihoods... even in a non climo situation.

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The signs are all there that this could be a big bust...I'd be surprised if we are warned...

Why are you always the most pessimistic person in this thread? Just let whatever happens, no need to go about killing weenies all the time.. Anyways 44* and not a cloud in sight 

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The signs are all there that this could be a big bust...I'd be surprised if we are warned...

now I thought back to the 10th percentile map. :(

 

lol.. prob time for bed for me.

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Why are you always the most pessimistic person in this thread? Just let whatever happens, no need to go about killing weenies all the time.. Anyways 44* and not a cloud in sight 

 

why you hate science? :P

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Why are you always the most pessimistic person in this thread? Just let whatever happens, no need to go about killing weenies all the time.. Anyways 44* and not a cloud in sight 

 

I'm trying to be realistic...there are plenty of people here and all over the internet who will give you what you want...false hope...

 

LWX still gives you 6"...enjoy!

 

http://www.erh.noaa.gov/lwx/winter/images/StormTotalSnowRange.png

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Having watched the models for the past couple days for this storm, the two areas that concern me as per snow accumulation are:

 

(1) marginal temperature at onset - ground temperatures leading into it combined with dropping air temperatures make it really hard to say when the snow will actually start accumulating. Here are a few pavement temperatures in the area: I270 @ I370: ~45F, US50 @ Beltway: ~48F, I97 @ MD32: ~45F, US50 @ Kent Narrows: ~45F.

 

Even as the air cools quickly (and not all the models are even guarenteeing that it is sub-freezing by onset), the ground temperature has a long way to drop. We could see the first couple inches melt off, and with forecasts looking somewhat marginal on the low end for accumulation (4-6" for DC north), if 2-3" fall before it starts to stick, that's half our predicted snowfall.

 

(2) Potential south shift / fringing across northern MD. If the temperatures are indeed colder and the onset is sub-freezing, then the canadian high is stronger and the track is generally running further south and the northern counties are fringed on the model runs that have shown this, again reducing accumulations.

 

--

 

Therefore, while I definitely see a strong thump possible, we have to thread the track and temperature needle to get it. It's possible, and the models have been oscillating back and forth between warmer/wetter and colder/drier for us - we need somewhere right in the middle to be optimum, a statistical bullseye.

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I'm ready for a good warm, humid night. Crickets and tree frogs out in full force. Frequent flashes of lightning from incoming storms. That low rumble of thunder, and the wind breaking the otherwise silent night.

Sorry for the banter. But I think we needed a break from this snow thing for a second lol.

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problem is the GFS isn't very good :(

 

I know you love the NWS...I'm just a lawyer...they give us a 30% chance of getting 8".....

 

http://www.erh.noaa.gov/lwx/winter/images/snowProbGT8.png

Like? not necessarily.. respect? yes.. they know a hell of a lot more than I do.. Unlike commercial outlets, NWS has no incentive to hype and I doubt they are forecasting with the hope to be wrong.

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