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February Medium/Long Range Disco


WinterWxLuvr

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It goes to Chicago. 

In this pattern I think the euro coastal is pretty unlikely (famous last words). Its evolution is dependent on a transient feature providing confluence which forces the low to track south of us.  Looking at how wound up the euro 500 is over the MS Valley it's hard to not envision a low at least tracking northward into the OH valley. 

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It goes to Chicago.

It's wild how different the euro op is handling the late week storm. And the EPS agrees. I posted the pbp in the wrong thread last night of the op euro. Ensembles show the same 2 waves of precip. First one overnight friday into saturday with a pretty good cold look (cold meaning just enough to think snow). the next wave on the heels is warmer with a cad signal. Absolutely a galaxy away from what the gfs is saying. If the euro didn't have what appears to be solid support from the EPS I would totally discount it. It's a war for now. We'll see how she goes.

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In this pattern I think the euro coastal is pretty unlikely (famous last words). Its evolution is dependent on a transient feature providing confluence which forces the low to track south of us.  Looking at how wound up the euro 500 is over the MS Valley it's hard to not envision a low at least tracking northward into the OH valley. 

 

Wes, I was reading up on confluence and what it means for DC snowstorms.  It seems all the big ones had some sort of confluence north of us to force the coastal south of us and bring it up the coast.  Is confluence the same as a 50/50 low? 

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Wes, I was reading up on confluence and what it means for DC snowstorms.  It seems all the big ones had some sort of confluence north of us to force the coastal south of us and bring it up the coast.  Is confluence the same as a 50/50 low? 

 

50/50 low generates confluence.  It the storm amplifies too early it will weaken this, slide the HP out to sea and pull the storm north.  Better for the upper level trof to cut off from the flow and build confluence farther west.  Jan 96 is a good example of this.

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Sorry guys, Monday mauler appears to be a lost cause....for most. Next window of opportunity appears to be mid February. However, thanks to positive AO, our cold supply will be limited during these events.

 

Maybe for you, but most of us don't live on a tiny peninsula right by the ocean.. now run off and enjoy your rain

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50/50 low generates confluence.  It the storm amplifies too early it will weaken this, slide the HP out to sea and pull the storm north.  Better for the upper level trof to cut off from the flow and build confluence farther west.  Jan 96 is a good example of this.

A big block with a 50 50 upper low under it will produce confluence and force a low south even with early amplification.  The Feb 10th 2013 event is a great example.  The upper  low got into OH northwest of us and then was forced to our south by the massive block.  That's why I'm partial to having a big ridge over southern greenland and a closed low south of it near Nova scotia.  Least those are my thoughts on the subject.  Without that block, then you're right,  early amplification generally is a killer as it builds heights to the east of the trough.

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Sorry guys, Monday mauler appears to be a lost cause....for most. Next window of opportunity appears to be mid February. However, thanks to positive AO, our cold supply will be limited during these events.

Are you really sorry? Remember what happened to the dude in the movie Roadhouse who told his boss he was sorry about losing Dalton

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Feb 9-10 looks interesting on the Euro. I am sure it will evolve to something much different but verbatim it destroys C VA, up to SNJ.

 

Does the 2nd wave get as far west with snow as Roanoke?  This is 2 runs in a row with this type of solution. 

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18Z GFS again showing significant icing for western MD and Eastern WV valley locations Tuesday night. That solution keeps coming up on models. If we can lay down some snow on Monday, maybe it will be 28 instead of 31 degree FZRA overnight.

ETA: And, the model does it again on Saturday for the same areas. Long duration ice storm with 24 hours of freezing precip.

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Something weird going on with my wunderground forecast for the week after this one.  I mean, I hope it's right, but no way....

 

Tuesday Night
nt_flurries.gif Partly cloudy with a few scattered snow flurries. Low 22F. Winds light and variable.
Wednesday
flurries.gif Mostly cloudy with scattered snow flurries mainly during the morning. High 38F. Winds light and variable.
Wednesday Night
nt_flurries.gif Mostly cloudy in the evening then scattered snow flurries possible after midnight. Low near 25F. Winds light and variable.
Thursday
snow.gif Periods of light snow. High 36F. Winds N at 5 to 10 mph. Chance of snow 60%. About one inch of snow expected.
Thursday Night
nt_snow.gif Cloudy with some light snow. Low 22F. Winds NNW at 5 to 10 mph. Chance of snow 60%. About one inch of snow expected.
Friday
snow.gif Cloudy with some light snow. High 33F. Winds NW at 5 to 10 mph. Chance of snow 50%. Snow accumulations less than one inch.
Friday Night
nt_snow.gif Periods of light snow. Low 16F. Winds NNW at 5 to 10 mph. Chance of snow 60%. 1 to 3 inches of snow expected.
Saturday
snow.gif Light snow during the morning will taper off as a few snow showers during the afternoon. High around 35F. Winds NW at 5 to 10 mph. Chance of snow 60%. Snow accumulations less than one inch.
Saturday Night
nt_chancesnow.gif Becoming partly cloudy later with any flurries or snow showers ending by midnight. Low 22F. Winds WNW at 5 to 10 mph. Chance of snow 30%.
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