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Monday Mauler Obs Thread


Avdave

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Both the HRRR and RAP, well, RAP2 I guess are showing a similar scenario of a weak 850 swirl running into central WV then sort of redeveloping/meandering by the cities.  Combine that with the vort mostly passing to our north we're not going to easily resolve parts of the column until most if it is over.  There could be a decent burst near or post 12pm (perhaps a full fledged flip is sooner, but that's about when we're "safe" above on those models) but looks like that might be centered DC north .. emphasis on north.

 

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Is the hrrrrrr better than the euro? Or nam or gfs?

On the whole no, but in some ways maybe. The hi res models are subject to significant error at times, especially on certain variables. But when you see them continually spit out similar scenarios they can be useful I think. The HRRR is killer for svr weather.. except when it busts hard (which it does).. but it's good enough to be noticeable. I have not used them a ton in general forecasting but have more in the past 6-12 mo or so and think the results are decent if you know what to use and what to toss.

Their general scenario makes sense overall. We'll be fighting warming at least close to the cities much of the time given the midlevels. There is also not a lot of good cold air close by to tap. There's some once you get into PA a ways but I don't think we will effectively tap that till it's too late around here. Again, mostly focused on DC proper... but I'd be worried N&W in the immediate county area and lean low on expectations.

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go for it. Today was the first day that I saw the majority of roads not have snow on them since 1/26. That only lasted not even a day. I am sad panda. I'd love to give this to Ji.

Send it all to DCA and to northern Virginia, including Ji. 

 

You miss seeing your roads because they are covered with snow? I should come up there and dig your entire city out of the snow.

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When you bust with company it is always good because it is bustier.

People focus too much on output vs what the model shows otherwise sometimes I think.  I've thought all along these super high liquid totals are a little suspect.  There may be a stripe of 1"+ qpf but the widespread 1.25"+ on some models seemed a fantasy all along in this setup.  We'll probably get thumped at some pt.. it could mostly be a rain thumping for me.  Following the vort is simplistic in the grand scheme but it usually works well and all guidance isn't too friendly for many of us in that regard on this one.  With some luck the best will end up NW of Philly so they don't keep cashing in. 

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People focus too much on output vs what the model shows otherwise sometimes I think.  I've thought all along these super high liquid totals are a little suspect.  There may be a stripe of 1"+ qpf but the widespread 1.25"+ on some models seemed a fantasy all along in this setup.  We'll probably get thumped at some pt.. it could mostly be a rain thumping for me.  Following the vort is simplistic in the grand scheme but it usually works well and all guidance isn't too friendly for many of us in that regard on this one.  With some luck the best will end up NW of Philly so they don't keep cashing in. 

This is not trending well at all for our area as we close in. The HRRR and RAP keep going north with every run. I am at 2" on one and 3" on the other now and even if i get that it will most likely only be on grassy surfaces.

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People focus too much on output vs what the model shows otherwise sometimes I think.  I've thought all along these super high liquid totals are a little suspect.  There may be a stripe of 1"+ qpf but the widespread 1.25"+ on some models seemed a fantasy all along in this setup.  We'll probably get thumped at some pt.. it could mostly be a rain thumping for me.  Following the vort is simplistic in the grand scheme but it usually works well and all guidance isn't too friendly for many of us in that regard on this one.  With some luck the best will end up NW of Philly so they don't keep cashing in. 

I wouldn't be shocked if we got wall to wall rain ending as a 20 minute period of snow/flurries.

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This is not trending well at all for our area as we close in. The HRRR and RAP keep going north with every run. I am at 2" on one and 3" on the other now and even if i get that it will most likely only be on grassy surfaces.

I don't think they match up with radar. I'm not worried about precip missing us to the north, I'm worried about temps.

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I wouldn't be shocked if we got wall to wall rain ending as a 20 minute period of snow/flurries.

Definitely possible.. or no snow really. I think a best case for us is probably like a 1-3/2-4 hour window, perhaps 1 hour or so of it being snow that could do something. 

 

I make no claim to the HRRR's prowess late run but it is interesting to watch it progress hour to hour with the 850 "swirl".  This last run totally screws us by keeping it a little stronger the whole way then running it right over us. 

 

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