OceanStWx Posted February 26, 2019 Share Posted February 26, 2019 1 minute ago, HoarfrostHubb said: Yeah...that is probably how I should have phrased that. Does this issue with model resolution occur over other mountain ranges, or is there something different about the Whites and Greens? Because our mountains tend to be smaller and isolated the grid averaging can make MWN “look” like 5,000 ft. 1 Link to comment Share on other sites More sharing options...
OceanStWx Posted February 26, 2019 Share Posted February 26, 2019 Just now, powderfreak said: Any idea how far back you have to go for MWN to see a 170+ mph gust? Decades? Most likely. We don’t have hard copies of all their records, but it’s highest since 2005. And highest in February. So decades is likely a safe call. 1 Link to comment Share on other sites More sharing options...
HoarfrostHubb Posted February 26, 2019 Share Posted February 26, 2019 2 minutes ago, OceanStWx said: More or less. To keep the same amount of air flowing over the mountain it has to accelerate when the depth of flow shrinks. I get how it works in something with actual sides/top/bottom (like a nozzle or the aforementioned hose), but there is no compressing force above the mountain...wouldn’t the air just go up and over? Link to comment Share on other sites More sharing options...
OceanStWx Posted February 26, 2019 Share Posted February 26, 2019 1 minute ago, HoarfrostHubb said: I get how it works in something with actual sides/top/bottom (like a nozzle or the aforementioned hose), but there is no compressing force above the mountain...wouldn’t the air just go up and over? Inversion. Link to comment Share on other sites More sharing options...
HoarfrostHubb Posted February 26, 2019 Share Posted February 26, 2019 1 minute ago, OceanStWx said: Inversion. Thanks for your patience and info. Fascinating Link to comment Share on other sites More sharing options...
powderfreak Posted February 26, 2019 Share Posted February 26, 2019 I'm trying to look through some soundings to illustrate this... you have anything good Chris that might be able to show this, like a BUFKIT snapshot or something? It sounds very similar to like upslope precip and relationship to the inversion...inversion lowers and it starts squeezing out snow like toothpaste from a bottle. Link to comment Share on other sites More sharing options...
dendrite Posted February 26, 2019 Share Posted February 26, 2019 Inversion at H75 at CHH tonight. I don't see the GYX RAOB data up yet. Link to comment Share on other sites More sharing options...
OceanStWx Posted February 26, 2019 Share Posted February 26, 2019 3 minutes ago, powderfreak said: I'm trying to look through some soundings to illustrate this... you have anything good Chris that might be able to show this, like a BUFKIT snapshot or something? It sounds very similar to like upslope precip and relationship to the inversion...inversion lowers and it starts squeezing out snow like toothpaste from a bottle. You can see the inversion starts just above summit level, 750ish, and that’s what squeezes the flow. 2 Link to comment Share on other sites More sharing options...
OceanStWx Posted February 26, 2019 Share Posted February 26, 2019 6 minutes ago, HoarfrostHubb said: Thanks for your patience and info. Fascinating I’m just as fascinated when this stuff happens too. Link to comment Share on other sites More sharing options...
CT Rain Posted February 26, 2019 Share Posted February 26, 2019 I posted this. You can see MWN at ~780mb just below the inversion. 3 Link to comment Share on other sites More sharing options...
mreaves Posted February 26, 2019 Share Posted February 26, 2019 20 minutes ago, Ginx snewx said: Here ya go freak https://www.google.com/amp/s/www.forbes.com/sites/marshallshepherd/2016/02/20/tale-of-two-wind-stories-148-mph-colorado-wind-gust-and-the-venturi-effect/amp/ If you could, you should drive up tomorrow to catch some really nice drifts. 53 mph reported at KMPV. Link to comment Share on other sites More sharing options...
Ginx snewx Posted February 26, 2019 Share Posted February 26, 2019 3 minutes ago, mreaves said: If you could, you should drive up tomorrow to catch some really nice drifts. 53 mph reported at KMPV. Nice, 1/2 hr in a car is all I got right now. Take pics please 1 Link to comment Share on other sites More sharing options...
HoarfrostHubb Posted February 26, 2019 Share Posted February 26, 2019 7 minutes ago, CT Rain said: I posted this. You can see MWN at ~780mb just below the inversion. That’s great! Squeeze that air Link to comment Share on other sites More sharing options...
CT Rain Posted February 26, 2019 Share Posted February 26, 2019 Just now, HoarfrostHubb said: That’s great! Squeeze that air We Bernoulli Link to comment Share on other sites More sharing options...
MarkO Posted February 26, 2019 Share Posted February 26, 2019 I vaguely remember this from waaaaay back. I remember the professor said they will sometimes raise the ground below a bridge to increase flow and lower the water elevation. Seems counterintuitive, but it happens in certain flows. 1 Link to comment Share on other sites More sharing options...
CoastalWx Posted February 26, 2019 Share Posted February 26, 2019 Bernoulli explains like everything lol. Link to comment Share on other sites More sharing options...
Ginx snewx Posted February 26, 2019 Share Posted February 26, 2019 Just now, MarkO said: I vaguely remember this from waaaaay back. I remember the professor said they will sometimes raise the ground below a bridge to increase flow and lower the water elevation. Seems counterintuitive, but it happens in certain flows. We do this with flow through a pipe to increase the pressure we reduce the space it is squeezed through Link to comment Share on other sites More sharing options...
CoastalWx Posted February 26, 2019 Share Posted February 26, 2019 But yeah very simple as chris said. That air has to still go somewhere. Take all that volume of air(which treated as liquid) and force in a more narrow passage zone and we blow. Awesoke stuff. Link to comment Share on other sites More sharing options...
Ginx snewx Posted February 26, 2019 Share Posted February 26, 2019 1 minute ago, CoastalWx said: Bernoulli explains like everything lol. Even zits 1 Link to comment Share on other sites More sharing options...
HoarfrostHubb Posted February 26, 2019 Share Posted February 26, 2019 4 minutes ago, MarkO said: I vaguely remember this from waaaaay back. I remember the professor said they will sometimes raise the ground below a bridge to increase flow and lower the water elevation. Seems counterintuitive, but it happens in certain flows. That’s actually pretty cool. Were you in Civil E? Link to comment Share on other sites More sharing options...
HoarfrostHubb Posted February 26, 2019 Share Posted February 26, 2019 3 minutes ago, Ginx snewx said: We do this with flow through a pipe to increase the pressure we reduce the space it is squeezed through Rocket nozzles do this too. 1 Link to comment Share on other sites More sharing options...
Baroclinic Zone Posted February 26, 2019 Share Posted February 26, 2019 we like physics man Link to comment Share on other sites More sharing options...
powderfreak Posted February 26, 2019 Share Posted February 26, 2019 19 minutes ago, OceanStWx said: You can see the inversion starts just above summit level, 750ish, and that’s what squeezes the flow. That's awesome. Thanks dude. Perfect level to squeeze it out. I think Mansfield's geography lends itself well to that. The 4000ft ridgeline isn't like a classic pyramid peak/summit but it doesn't allow wind any options for going around. I firmly believe the meso-scale topography of it plays into the upslope snow and winds. It's not a Peak that wind can bend around, it has to go over it. MWN is similar with the Presidentials all around. Wind is locally forced to go up and over. There is no easy escape around the terrain. Link to comment Share on other sites More sharing options...
MarkO Posted February 26, 2019 Share Posted February 26, 2019 2 minutes ago, HoarfrostHubb said: That’s actually pretty cool. Were you in Civil E? Yup, but I don't remember much of it. 1 Link to comment Share on other sites More sharing options...
mreaves Posted February 26, 2019 Share Posted February 26, 2019 10 minutes ago, Ginx snewx said: Nice, 1/2 hr in a car is all I got right now. Take pics please It would have been like the inside of a cotton ball earlier this evening on my way to my meeting. 1 Link to comment Share on other sites More sharing options...
CoastalWx Posted February 26, 2019 Share Posted February 26, 2019 Maybe that’s why Kevin loses branches. Air is forced up and over that smooth, frictionless surface of his head. 2 5 Link to comment Share on other sites More sharing options...
wxsniss Posted February 26, 2019 Share Posted February 26, 2019 Fascinating stuff about peaks and cap creating a Bernoulli’s effect, thanks guys Link to comment Share on other sites More sharing options...
Hoth Posted February 26, 2019 Share Posted February 26, 2019 19 minutes ago, Baroclinic Zone said: we like physics man Yeah, this thread is gold. Link to comment Share on other sites More sharing options...
alex Posted February 26, 2019 Share Posted February 26, 2019 21 minutes ago, HoarfrostHubb said: Rocket nozzles do this too. And don't forget, in a different way, snow gun nozzles. The pressure differential reduces the temperature of the water and air going through (PV=nRT) 1 Link to comment Share on other sites More sharing options...
HoarfrostHubb Posted February 26, 2019 Share Posted February 26, 2019 Just now, alex said: And don't forget, in a different way, snow gun nozzles. The pressure differential reduces the temperature of the water and air going through (PV=nRT) That makes sense. I never thought about that. Link to comment Share on other sites More sharing options...
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