TalcottWx Posted February 11, 2012 Share Posted February 11, 2012 Thanks SBoswx....Unrelated, did you hear...The Giants won the super bowl All the jersey people at school remind me every second of my waking life... including my Giants roomate... Link to comment Share on other sites More sharing options...
Ian Posted February 11, 2012 Share Posted February 11, 2012 Are we talking about the 12 to 15 hr time period on the 12z GFS? Also, I don't think we get norluns down here? you can get them anywhere they're just not very common around here. it's not a norlun. Link to comment Share on other sites More sharing options...
Deck Pic Posted February 11, 2012 Share Posted February 11, 2012 Are we talking about the 12 to 15 hr time period on the 12z GFS? Also, I don't think we get norluns down here? I dont think they are common, but as far as i know it is just an inverted trough that is oriented west to east....usually they are associated with instability but that may just be the standard one that forms off the coast in SNE Link to comment Share on other sites More sharing options...
yoda Posted February 11, 2012 Share Posted February 11, 2012 Yes, most of the models do show a norlun trough rotating down from PA during that time. Ah thanks. QPF field looked light, but that's to be expected I guess. Would be nice to see Link to comment Share on other sites More sharing options...
chris87 Posted February 11, 2012 Share Posted February 11, 2012 you can get them anywhere they're just not very common around here. it's not a norlun. Ian is right, it's not correct to call it a norlun (its missing a few of the necessary features), so i stand corrected, its a surface trough which is enhancing convergence Edit: (for reference) Five criteria must be met to be considered a NORLUN trough. They are: T1-T5 (approx. 500 feet AGL to 7000 feet AGL [~950 mb to 800 mb for the east coast]) temperature difference is 10C or greater (Basically states that there has to be instability in the low levels of the atmosphere) Boundary layer RH must be greater than 50% with a wind component from off the ocean on one side of the trough (Basically states that you need a decent amount of boundary layer moisture; the wind from the ocean just helps to maintain this moisture) 500 mb positive vorticity advection is observed with associated 700 mb vertical velocity values (This enhances upward vertical motion and increases the depth of the unstable layer) trough axis is expected to be nearly stationary for at least 6 hours. 850 mb flow is very weak or is parallel to the surface trough (Allows snow squalls to continually traverse the same areas) Link to comment Share on other sites More sharing options...
TalcottWx Posted February 11, 2012 Share Posted February 11, 2012 What is meant to be a lake effect product, actually works well for this situation... check out the convergence area denoted in red Link to comment Share on other sites More sharing options...
Jebman Posted February 11, 2012 Share Posted February 11, 2012 35 degrees with rain and snow Link to comment Share on other sites More sharing options...
MN Transplant Posted February 11, 2012 Share Posted February 11, 2012 just got a new weather station. Is 38.6 a correct reading near bethesda? Probably ok, depends a lot on where you site it. Here's another station in Bethesda: http://www.wunderground.com/weatherstation/WXDailyHistory.asp?ID=KMDCHEVY2&day=11&month=02&year=2012 Link to comment Share on other sites More sharing options...
Grothar of Herndon Posted February 11, 2012 Share Posted February 11, 2012 35/33 Light snow Herndon. Link to comment Share on other sites More sharing options...
Ellinwood Posted February 11, 2012 Share Posted February 11, 2012 Still light snow in SW Gaithersburg, though the snow that had accumulated last night is now fully melted. Link to comment Share on other sites More sharing options...
Jebman Posted February 11, 2012 Share Posted February 11, 2012 More snow mixing in - snow picking up - temp down to 34.8 N wind gusts to 18 mph Link to comment Share on other sites More sharing options...
PhineasC Posted February 11, 2012 Share Posted February 11, 2012 More snow mixing in - snow picking up - temp down to 34.8 N wind gusts to 18 mph Please check your thermometer. There are no stations anywhere near that in Woodbridge... Link to comment Share on other sites More sharing options...
Scuddz Posted February 11, 2012 Share Posted February 11, 2012 Really tiny flakes in Columbia. If i wasnt wearing a black jacket, I'd say drizzle Link to comment Share on other sites More sharing options...
MN Transplant Posted February 11, 2012 Share Posted February 11, 2012 Fun to watch the PWS graphs drop off west of the front. Lame that this is such a big deal this season. Flurries here, about steady at 37.3. Link to comment Share on other sites More sharing options...
SoxFanNH Posted February 11, 2012 Share Posted February 11, 2012 37 with the snow winding down in Fairfax. Link to comment Share on other sites More sharing options...
eurojosh Posted February 11, 2012 Share Posted February 11, 2012 just got a new weather station. Is 38.6 a correct reading near bethesda? Yes. 38.2 here in Bethesda too. I'm not too hopeful about this line about to come through. Link to comment Share on other sites More sharing options...
aldie 22 Posted February 11, 2012 Share Posted February 11, 2012 What kind of temp drop are we looking at....10 degrees....more? How quickly.... Link to comment Share on other sites More sharing options...
gymengineer Posted February 11, 2012 Share Posted February 11, 2012 The other regions are learning about BL issues in this storm-- we're pros at it by now. Link to comment Share on other sites More sharing options...
jnis Posted February 11, 2012 Share Posted February 11, 2012 Snow has picked up some here, but it is definitely melting faster than it is falling. It also looks like the sun wants to peek trough the clouds. Link to comment Share on other sites More sharing options...
TUweathermanDD Posted February 11, 2012 Share Posted February 11, 2012 yup, radar improving each scan....i'm liking the inverted trough for this evening that you mentioned earlier too hey chris, what are the implications of the inverted trough for us? thanks. Link to comment Share on other sites More sharing options...
Ian Posted February 11, 2012 Share Posted February 11, 2012 What kind of temp drop are we looking at....10 degrees....more? How quickly.... It's going to get cold and windy Link to comment Share on other sites More sharing options...
Deck Pic Posted February 11, 2012 Share Posted February 11, 2012 Fun to watch the PWS graphs drop off west of the front. Lame that this is such a big deal this season. Flurries here, about steady at 37.3. ha...I've been doing the same thing Link to comment Share on other sites More sharing options...
Ian Posted February 11, 2012 Share Posted February 11, 2012 I hope the front hold off till after 4 or 5. I don't want to waste heavy snow prior. Link to comment Share on other sites More sharing options...
aldie 22 Posted February 11, 2012 Share Posted February 11, 2012 It's going to get cold and windy Thanks Link to comment Share on other sites More sharing options...
Deck Pic Posted February 11, 2012 Share Posted February 11, 2012 I hope the front hold off till after 4 or 5. I don't want to waste heavy snow prior. I dont see that happening...do you?....look where the squall line is now?...that's like 1.5 to 2.5 hours away? Link to comment Share on other sites More sharing options...
WVclimo Posted February 11, 2012 Share Posted February 11, 2012 What kind of temp drop are we looking at....10 degrees....more? How quickly.... I think 12Z NAM looked like about a 10 degree drop over 4 hours, and 15 degrees in 6 hours. Wind chills should really be the big impact. Link to comment Share on other sites More sharing options...
MN Transplant Posted February 11, 2012 Share Posted February 11, 2012 What kind of temp drop are we looking at....10 degrees....more? How quickly.... Probably more like a few quickly, 5 over an hour, 10 by dinnertime? Kind of guessing. Link to comment Share on other sites More sharing options...
MillzPirate Posted February 11, 2012 Share Posted February 11, 2012 Just had some flakes mix in at rock creek park Link to comment Share on other sites More sharing options...
chris87 Posted February 11, 2012 Share Posted February 11, 2012 hey chris, what are the implications of the inverted trough for us? thanks. a period of light snow which looks to mainly favor those along of I-95 and east Link to comment Share on other sites More sharing options...
MN Transplant Posted February 11, 2012 Share Posted February 11, 2012 I dont see that happening...do you?....look where the squall line is now?...that's like 1.5 to 2.5 hours away? 3pm-ish Link to comment Share on other sites More sharing options...
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