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Weekend Storm Discussion Part II, 2/18-2/19


stormtracker

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The clown maps are going to be even worse than normal with the borderline nature of this event, so ignore them.

Are those things ever worth looking at for analysis purposes or just fun to look at? I never take them seriously. I've lived here along time as many others. It's not terribly difficult to look at the surface, 850, and 500 panels and pretty much know what the model would imply.

The most recent GFS is telling me that if I didn't have to battle any temp issues, 4-8 or 6-10 would be reasonable. Gotta cut that in half here. 3-5 just n&w of the cities? Seems ok.

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Basically from 18z to 22-23z or so..it's snowing pretty darn hard in the city.

If you take the GFS at face value, 18z seems like the changeover time, and DCA/BWI get about 0.3" after that. 2-3" snow considering the surface. If we go over instead by 15z or so, then there is 0.5" frozen and we end up with a nice little event.

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If you take the GFS at face value, 18z seems like the changeover time, and DCA/BWI get about 0.3" after that. 2-3" snow considering the surface. If we go over instead by 15z or so, then there is 0.5" frozen and we end up with a nice little event.

12 hr total qpf beginning 18Z

http://mag.ncep.noaa.gov/NCOMAGWEB/appcontroller?prevPage=Param&MainPage=indexℑ=&page=Param&cycle=02%2F16%2F2012+12UTC&rname=PRECIP+PARMS&pname=precip_p12&pdesc=&model=GFS&area=NAMER&cat=MODEL+GUIDANCE&fcast=090&areaDesc=North+America+-+US+Canada+and+northern+Mexico&prevArea=NAMER&currKey=model&returnToModel=&imageSize=L

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If you take the GFS at face value, 18z seems like the changeover time, and DCA/BWI get about 0.3" after that. 2-3" snow considering the surface. If we go over instead by 15z or so, then there is 0.5" frozen and we end up with a nice little event.

I could see it snowing a bit earlier than that, but it might be a 34F snow..or something like that. Once it flips, it should come down good..but surface temps will may be a slight issue at first, anyways. With any elevation...even 300'..it will make a difference.

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Gotta stay optimistic about temps here. Subtle shifts can really make us smile (or cry). Pretty much a lock we get some rain at the beginning. Can't really get around that. Once we hit nowcasting time we'll have a much better idea of how much we're going to lose before the changeover.

GFS showing 40's at onset. What if we are say.....38 or so?

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Gotta stay optimistic about temps here. Subtle shifts can really make us smile (or cry). Pretty much a lock we get some rain at the beginning. Can't really get around that. Once we hit nowcasting time we'll have a much better idea of how much we're going to lose before the changeover.

GFS showing 40's at onset. What if we are say.....38 or so?

my only concern is that realistically, there aren't many storms that i can think of where we do well with a rain to snow changover (last year was one of the better ones i can remember like that)...but given the way this winter has gone, it would be great to see a couple of inches...i'll take it and run with it.

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I could see it snowing a bit earlier than that, but it might be a 34F snow..or something like that. Once it flips, it should come down good..but surface temps will may be a slight issue at first, anyways. With any elevation...even 300'..it will make a difference.

Surface dews on the GFS are just plain ugly. Still around 35 at 15z. Would be great to have the GFS precip and NAM temps (/banter)

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