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Christmas Storm VI


Cold Rain

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Wow, I dont know bout much rain here in extreme NW GA tonight unless its Frz. Rain. Maybe Lookout or someone can post a sounding for Dalton (KDNN) right now. Temps have taken a freefall at the warmer airport tonight We have gone from 45 a few hours ago at the high down to 32 already! DP are still in the 20s at that!

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Per radar, a really nice band of snow headed right towards nashville. looks to be snowing there before midnight...

If you look here, the METAR stations have little symbols, sometimes dots (for rain) and x's (for snow) 2 dot's or x's is light, 3 is moderate

http://www.daculaweather.com/grlevel3/storm_mode_1.php

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RDU down to 34, dewpoint at 18

Im not sure why temperatures tonight are important. Regardless if anyone cools a lot tonight, temperatures will rise tomorrow to near 40. But thats only initially and everything points to cooling by evening and snow even if the GFS is way off.

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Perhaps a met or someone could chime in on this but should we be looking for the radar to begin to blossom over louisiana and mississippi over the next 6 hours or so. Just trying to understand where all the moisture will be coming from that is going to fall in AL and GA tomorrow. Thank you in advance.

The rain shield in TX will continue to move east, arriving in west LA in the next 3 hrs, also convection should begin to increase off the TX coastline as the surface low moves offshore later tonight.

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Out of curiosity, would any of the pros like to comment on the 23z RUC? the 19Z RUC was mentioned earlier as the last few frames might have looked like a phase on the 500Mb Vorticity maps, but I wasn't sure if the 23Z also showed this solution. I'm looking at http://www.nco.ncep.noaa.gov/pmb/nwprod/analysis/namer/ruc/hr4/index_500_l_loop.shtml.

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Im not sure why temperatures tonight are important. Regardless if anyone cools a lot tonight, temperatures will rise tomorrow to near 40. But thats only initially and everything points to cooling by evening and snow even if the GFS is way off.

They are important for us due to projected boundary layer problems. We need to radiate this afternoon's heat away and then insulate with clouds before insolation warms our boundary layer and we end up with more rain than snow. We (Atlanta area) need clouds overhead by 12z.

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They are important for us due to projected boundary layer problems. We need to radiate this afternoon's heat away and then insulate with clouds before insolation warms our boundary layer and we end up with more rain than snow. We (Atlanta area) need clouds overhead by 12z.

Not really, once the clouds come overhead the temps will rise. Look at the 925mb temps, very warm in that area. Radiational cooling really won't make much of a difference for this storm, it's the dynamics and timing as well as track that you need to be looking for.

925mb temps

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Just a jog to your north, sitting at 38.0. Don't know the dewpoint, but would imagine it would be close to yours.

I use UGA's Experiment Station Auto reporting system. It is about 3 miles se of me.

http://www.griffin.uga.edu/aemn/cgi-bin/AEMN.pl?zip=30223

Dang, if we can get on down with the temps and then get the clouds with some virga early... T

Merry Christmas one and all, by the way. Tony

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Out of curiosity, would any of the pros like to comment on the 23z RUC? the 19Z RUC was mentioned earlier as the last few frames might have looked like a phase on the 500Mb Vorticity maps, but I wasn't sure if the 23Z also showed this solution. I'm looking at http://www.nco.ncep....00_l_loop.shtml.

Yea if you notice the energy coming down the west side of the southern wave in the last couple of frames. The energy really forces it neutral and maybe negative. With a surface low in place the negative till will ramp it up...like putting a paddle in a river towards up stream, rather than down stream where the force of the water just slides off.

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