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1/19 - The Weekend Roulette Wheel Thing


DDweatherman
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Frederick seems to do pretty decent with these "rare" southern storms due to the combo of upslope and valley CAD.  NS dominant storms are a little more sus as I get that downslope component.  I think NPZ lives in an area where those effects are amplified.  What makes that Clarksburg to Damascus area in Moco (and along that line) underrated for snow is they're usually not too far north or south and have topography working for them.  I think they actually average a little more snow than downtown Frederick.

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22 minutes ago, T. August said:

I think you are good for 4-6”

14 minutes ago, Maestrobjwa said:

I think you're in a slightly better spot than I am. I'm sweating it a bit here...but you may have just enough if the temps are indeed close!

I hope so. A lot of the guidance looks pretty good here, but some of it dryslots my area or even has temp/precip type issues where I’m right at the gradient.

It’s a very common thing here, and it could go either way. @ravensrule and @nw baltimore wx know exactly what I’m talking about, and just have to see where the chips fall.

Since I haven’t seen a warning level storm IMBY in a long time (I was out on 1/6 which probably had around ~5”), I’m naturally a bit cautious.

My bar is 3”. That is enough to set us up for a very fun week of deep winter without getting too greedy.

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1 hour ago, Weather Will said:

WB 12Z RGEM little drier and tick SE compared to 6Z.

IMG_4916.png

IMG_4917.png

IMG_4918.png

I think the rgem has now adjusted qpf to reality it’s just too warm in the mid levels. But if you take that qpf and apply 10-1 snowfall from 95 NW that’s probably close to reality now imo. 

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8 minutes ago, clskinsfan said:

UK runs the mix line right along 95 early. Has a really nice thump west of that and swings through with snow to the east later in the day. 

NGL, if we mix in Towson after being in the icebox for weeks, I'm gonna be a bitter bitch. I know that's the way of it I've lived here most of my life. But that doesn't make it any less annoying, hehe.

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1 hour ago, WEATHER53 said:

When we talk about I95 how does that break down mileage wise ?

is “Along” say within 10 miles  and then north and west greater than 10!or 20 or 30?

I would say 10-20 miles outside beltways and 20-30 inside. Probably difference in areas >= 250’ ASL. I know I grew up in one of those areas that went from zero to 100 when it came to snowfall away from 95. Lived 8-10 miles west and went up over 280’ in that span. Crazy microclimates 

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7 minutes ago, TowsonWeather said:

NGL, if we mix in Towson after being in the icebox for weeks, I'm gonna be a bitter bitch. I know that's the way of it I've lived here most of my life. But that doesn't make it any less annoying, hehe.

Yeah and being literally 5 mins south of Towson, I hear ya. It's particularly annoying since we kinda got fringed last time for being, wait for it...too far north <_< BUT...it is still snow and it'll be nice to look at :)

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Just now, MillvilleWx said:

I would say 10-20 miles outside beltways and 20-30 inside. Probably difference in areas >= 250’ ASL. I know I grew up in one of those areas that went from zero to 100 when it came to snowfall away from 95. Lived 8-10 miles west and went up over 280’ in that span. Crazy microclimates 

They’re real, especially in 2025 vs the days of old. That late November snow up here there was a coating a few blocks lower and 2+” on my street. 

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18 minutes ago, MillvilleWx said:

I would say 10-20 miles outside beltways and 20-30 inside. Probably difference in areas >= 250’ ASL. I know I grew up in one of those areas that went from zero to 100 when it came to snowfall away from 95. Lived 8-10 miles west and went up over 280’ in that span. Crazy microclimates 

So would you say out by Reston is closer to the 3-6 zone than the 1-3 south of I-66 one your forecast had? Just had a little bit of trouble figuring out where each zone reached from your forecast, but either way its always awesome to have actual mets provide input in these threads!

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4 minutes ago, DDweatherman said:

image.thumb.png.d79138b368b144bafc82c840a6967713.png

Actually gets a little more precip over my yard this run. Canadians aside, temps aren't really an issue here other than at the beginning of the event. Missing the area of strong lift on most guidance is..

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