weatherMA Posted September 24, 2013 Share Posted September 24, 2013 Low was only 45.7F but we arent going anywhere because as we aproach 9a, its 47.5F. Link to comment Share on other sites More sharing options...
Nittany88 Posted September 24, 2013 Share Posted September 24, 2013 Welcome to November in Vermont...endless clouds, northwest flow, and foggy mountain tops. Oh wait its SEPTEMBER wtf. Link to comment Share on other sites More sharing options...
eyewall Posted September 24, 2013 Share Posted September 24, 2013 Welcome to November in Vermont...endless clouds, northwest flow, and foggy mountain tops. Oh wait its SEPTEMBER wtf. LOL yeah my NWS forecast went from clear each day to clouds through Thursday night. Link to comment Share on other sites More sharing options...
powderfreak Posted September 24, 2013 Share Posted September 24, 2013 Welcome to November in Vermont...endless clouds, northwest flow, and foggy mountain tops. Oh wait its SEPTEMBER wtf. We have cleared out here on the east side... beautiful afternoon on the way over here, lol. It looks like blocked flow but Froude Number is showing 1.3... but its got that moisture stuck below the inversion which is at or below the summit level type of look to the satellite image. 1,500ft at the base of Stowe is in the sun (though the upper lift terminals are ending in the clouds)... And the western slope communities are still under the low overcast, blocked by the mountains. Link to comment Share on other sites More sharing options...
dryslot Posted September 24, 2013 Share Posted September 24, 2013 Its time for the ULL to move along, Chilly NW wind and overcast with showers lurking to the NE Link to comment Share on other sites More sharing options...
Nittany88 Posted September 24, 2013 Share Posted September 24, 2013 We have cleared out here on the east side... beautiful afternoon on the way over here, lol. It looks like blocked flow but Froude Number is showing 1.3... but its got that moisture stuck below the inversion which is at or below the summit level type of look to the satellite image. 1,500ft at the base of Stowe is in the sun (though the upper lift terminals are ending in the clouds)... webcam.jpg And the western slope communities are still under the low overcast, blocked by the mountains. westslope.jpg We were blocked all morning (Froude was anywhere from 0.25-0.75 last night and this morning), but then just on the latest ob it jumped up to 1.3, and that is actually quite evident in the observations and satellite pictures. We just broke out here in BTV. VIS when we were still blocked, that blocked upslope enhancement is really noticeable: VIS now unblocked, you can see the upslope enhancement melting away: Link to comment Share on other sites More sharing options...
Lava Rock Posted September 24, 2013 Share Posted September 24, 2013 We have cleared out here on the east side... beautiful afternoon on the way over here, lol. It looks like blocked flow but Froude Number is showing 1.3... but its got that moisture stuck below the inversion which is at or below the summit level type of look to the satellite image. 1,500ft at the base of Stowe is in the sun (though the upper lift terminals are ending in the clouds)... webcam.jpg And the western slope communities are still under the low overcast, blocked by the mountains. westslope.jpg PF, do you know what kind of cams those are on the buildings? Link to comment Share on other sites More sharing options...
MaineJayhawk Posted September 24, 2013 Author Share Posted September 24, 2013 Because looking at a frozen wasteland never gets old ... MWN this morning: Link to comment Share on other sites More sharing options...
eyewall Posted September 24, 2013 Share Posted September 24, 2013 WOw already rimed over good up there! As for here in the CPV it is turning out to be a beautiful afternoon. We are just about at full sun now. Link to comment Share on other sites More sharing options...
weatherMA Posted September 24, 2013 Share Posted September 24, 2013 Was full sun and 59F about 30 minutes ago but now its overcast and down to 58.1F. Link to comment Share on other sites More sharing options...
CoastalWx Posted September 24, 2013 Share Posted September 24, 2013 Since we are thinking about winter this was my last good winter weather capture in NC before moving up here: Wow, that was pretty darn loud. Link to comment Share on other sites More sharing options...
eyewall Posted September 24, 2013 Share Posted September 24, 2013 Wow, that was pretty darn loud. It definitely was! It was a vigorous upper level disturbance. Link to comment Share on other sites More sharing options...
CoastalWx Posted September 24, 2013 Share Posted September 24, 2013 It definitely was! It was a vigorous upper level disturbance. I think I remember that as well. Was it rather squally in nature? It wasn't from some sort of deformation band, correct? Link to comment Share on other sites More sharing options...
eyewall Posted September 24, 2013 Share Posted September 24, 2013 By the way we will have to see what this coastal/tropical system being shown in some models does next week. Link to comment Share on other sites More sharing options...
eyewall Posted September 24, 2013 Share Posted September 24, 2013 I think I remember that as well. Was it rather squally in nature? It wasn't from some sort of deformation band, correct? Yes it definitely was and yes there were deformation snows. Link to comment Share on other sites More sharing options...
powderfreak Posted September 24, 2013 Share Posted September 24, 2013 PF, do you know what kind of cams those are on the buildings? Not first hand but I can find out for you... I actually think the Stowe cam is or was Tim Kelley's at some point. Don't ask me how or why, haha. Link to comment Share on other sites More sharing options...
powderfreak Posted September 24, 2013 Share Posted September 24, 2013 We were blocked all morning (Froude was anywhere from 0.25-0.75 last night and this morning), but then just on the latest ob it jumped up to 1.3, and that is actually quite evident in the observations and satellite pictures. We just broke out here in BTV. VIS now unblocked, you can see the upslope enhancement melting away: Ahh that makes sense. As soon as the Froude values jumped up this morning, the clouds thinned out quickly but the clouds that remained, rose a few thousand feet and then centered themselves over the Spine.... consistent with 1< Froude Numbers. Earlier this morning, these clouds were lower down and left of the peaks. Link to comment Share on other sites More sharing options...
eyewall Posted September 24, 2013 Share Posted September 24, 2013 Clouds are increasing here once again. They are wave clouds at the mid levels. Link to comment Share on other sites More sharing options...
powderfreak Posted September 24, 2013 Share Posted September 24, 2013 Clouds are increasing here once again. They are wave clouds at the mid levels. I was out running when they moved in...pretty awesome waves in the atmosphere with the lowering sun only illuminating the lowest parts. They don't seem overly thick, so there was an awesome blue glow in the peaks of the waves where the sun couldn't reach. Link to comment Share on other sites More sharing options...
wxeyeNH Posted September 24, 2013 Share Posted September 24, 2013 Clouds are increasing here once again. They are wave clouds at the mid levels. Today I saw something interesting that I can't explain. One of those wave clouds sat just to my west for a couple of hours. The flow was from the NW and the skies were clear NW of the wave cloud but the wave cloud didn't move. Somewhat like a cloud that sits over the spine of the Greens with Orographic uplift keeping the cloud stationary over the relief. Thing is that the relief near this wave cloud is flat, there is no sustained uplift keeping the cloud in place. I watched and areas upwind and downwind stayed sunny but under the 5 mile wide wave cloud it remained cloudy. My only possible theory is that the wave cloud was somewhat downwind from Newfound Lake which runs N to South. If the water temps were substantially warmer than the airmass maybe vertical rising of the warm air over the lake would help. Air temps were in the upper 50's and I would guess water temp is around that so I don't think that is it. Link to comment Share on other sites More sharing options...
dendrite Posted September 25, 2013 Share Posted September 25, 2013 Today I saw something interesting that I can't explain. One of those wave clouds sat just to my west for a couple of hours. The flow was from the NW and the skies were clear NW of the wave cloud but the wave cloud didn't move. Somewhat like a cloud that sits over the spine of the Greens with Orographic uplift keeping the cloud stationary over the relief. Thing is that the relief near this wave cloud is flat, there is no sustained uplift keeping the cloud in place. I watched and areas upwind and downwind stayed sunny but under the 5 mile wide wave cloud it remained cloudy. My only possible theory is that the wave cloud was somewhat downwind from Newfound Lake which runs N to South. If the water temps were substantially warmer than the airmass maybe vertical rising of the warm air over the lake would help. Air temps were in the upper 50's and I would guess water temp is around that so I don't think that is it.Mountain waves can extend well downstream of the higher elevations before they finally dampen out. Mid level moisture increased from the NE during the afternoon which may explain why you saw nothing to your west at first. I saw them on my way home once I got near my exit around 3pm to the north and they moved overhead around 4-5ish. Link to comment Share on other sites More sharing options...
tamarack Posted September 25, 2013 Share Posted September 25, 2013 Mountain waves can extend well downstream of the higher elevations before they finally dampen out. Mid level moisture increased from the NE during the afternoon which may explain why you saw nothing to your west at first. I saw them on my way home once I got near my exit around 3pm to the north and they moved overhead around 4-5ish. Learned that while riding in a Cessna 185 almost 20 yr ago on a moderastely windy October day. Little Bigelow is moderately sloped on its north side, precipitous to the south, and we were headed south. The pilot, who had been flying for about 50 years, flew over the mt at modest speed to allow for choppy air, then a couple miles south sped up to 130k for the curuise back to Augusta. That's when we hit the fun; i n 15 seconds he'd chopped back to 80, while the loose items behind the seats bounced around the cabin. Later, on the gorund, he allowed as that was as nasty a bit of air as he'd ever encountered. I noted how he had dumped speed, and his deadpan reply, "I thought it would be better if the wings stayed on the airplane." Link to comment Share on other sites More sharing options...
CoastalWx Posted September 25, 2013 Share Posted September 25, 2013 Learned that while riding in a Cessna 185 almost 20 yr ago on a moderastely windy October day. Little Bigelow is moderately sloped on its north side, precipitous to the south, and we were headed south. The pilot, who had been flying for about 50 years, flew over the mt at modest speed to allow for choppy air, then a couple miles south sped up to 130k for the curuise back to Augusta. That's when we hit the fun; i n 15 seconds he'd chopped back to 80, while the loose items behind the seats bounced around the cabin. Later, on the gorund, he allowed as that was as nasty a bit of air as he'd ever encountered. I noted how he had dumped speed, and his deadpan reply, "I thought it would be better if the wings stayed on the airplane." Mtn waves are my enemy in aviation. Big time issue over the Rockies. Link to comment Share on other sites More sharing options...
wxeyeNH Posted September 25, 2013 Share Posted September 25, 2013 Thanks guys for the info! Looks like an extended period of dry weather coming up without big wind so maybe a nice color peak this year without constant storms knocking down leaves as individual trees reach their peak. Link to comment Share on other sites More sharing options...
eyewall Posted September 25, 2013 Share Posted September 25, 2013 Just like any other kind of oscillation it doesn't instantaneously stop. The same is true for mountain waves and oscillating air parcels, so yes they can definitely extend a decent distance downstream. Link to comment Share on other sites More sharing options...
weatherMA Posted September 25, 2013 Share Posted September 25, 2013 Forecast of 67 and sunny and it's been overcast and 50s. Hit 60 briefly but it's back in the mid 50s. Link to comment Share on other sites More sharing options...
MaineJayhawk Posted September 25, 2013 Author Share Posted September 25, 2013 Neat graphic by GYX on their Facebook page Link to comment Share on other sites More sharing options...
dendrite Posted September 25, 2013 Share Posted September 25, 2013 Neat graphic by GYX on their Facebook page IMG_28623680843792-1.jpg Good examples of those mountain wave clouds we mentioned earlier. Link to comment Share on other sites More sharing options...
wxeyeNH Posted September 25, 2013 Share Posted September 25, 2013 That picture of the Mount Washington cloud shadow is awesome. The shadow almost extends down to the latitude of NE Mass! Link to comment Share on other sites More sharing options...
powderfreak Posted September 25, 2013 Share Posted September 25, 2013 Good examples of those mountain wave clouds we mentioned earlier. So what exactly is the cause for that narrow clearing downstream of MWN...is that just a thin line of sinking air or is it just because the moisture is being blocked by the mountain, and there's lower RH in that thin band following the downstream vectors? I can visualize the mountain wave patterns propagating downstream, with areas of rising air and clouds, followed by sinking air and clear, etc...but am having a hard time with that thin line, as MWN is over-ruling anything else happening in the atmosphere. Link to comment Share on other sites More sharing options...
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