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Winter 2014-2015 Pattern Discussion Thread III


BIG FROSTY

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Folks, It's March.  I'm sure you will spout climo is meaningless in situations like this but I went and chopped some wood today in a sweatshirt and it was 34 degrees.  Yes 34...and you know what, with the sun out (I was in the shade btw) I never ever felt cold.  I even paused before and after the effort thinking it's has got to be in the  mid-high 40s out here.  Nonetheless when I checked the reading it was 34.  I am skeptical on the March 5-6 event for the Raleigh area. 

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This kind of setup where the southeast ridge flexes just enough favors ark-ms-tn-al, these situations rarely work for atl eastward because the nw flow is just not great and the cold can't come over mtns fast enough, so upstate sc I can't see anything for you at all

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Folks, It's March.  I'm sure you will spout climo is meaningless in situations like this but I went and chopped some wood today in a sweatshirt and it was 34 degrees.  Yes 34...and you know what, with the sun out (I was in the shade btw) I never ever felt cold.  I even paused before and after the effort thinking it's has got to be in the  mid-high 40s out here.  Nonetheless when I checked the reading it was 34.  I am skeptical on the March 5-6 event for the Raleigh area. 

 

Meh, I got a major sleet/ice storm on March 6th-7th just last year.  It can happen.  The first week of March is a stacked climo period.

 

 

Thanks james. So basically its the GFS selling images down on the street corner to any sucker who will buy.

 

Perhaps, though the Euro showed us a little love, too, so who knows?  I do not expect anything nor would I forecast anything for Thursday at this point, but it's possible.

 

The GGEM was close, but a little too far north with the front for the most part.

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This kind of setup where the southeast ridge flexes just enough favors ark-ms-tn-al, these situations rarely work for atl eastward because the nw flow is just not great and the cold can't come over mtns fast enough, so upstate sc I can't see anything for you at all

Yeah, I am going to have to move to Mississippi to see snow again; who knew?

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***ALERT *** ACCUMULATING SNOWSTORM THREAT MARCH 5.. FOR THE LOWER MIDDLE ATLANTIC ... MARCH 5 not sunday !!! MARCH 5 NOT sunday

MD DEL VA WVA and POSSIBLY Northern NC ..
southeast Third KY
western/ central TN

...

There is going to be a 1 DAY WARM UP .. . Wednesday MARCH 4 Up and down the East coast. 60s are likely over the Lower Middle Atlantic... 40s / 50s into Northern Middle Atlantic and southern New England (Philly to NJ to NYC to CT to se Mass).

a new STRONG Arctic cold front will arrive from the Midwest Wednesday night / Thursday Am. The front will Slow down as it reaches Northern GA SC NC. The 12z SATURDAY GFS Model shows a 2ND round of precip move up the front into TN WVA VA MD DEL after reaches NC. This results in SEVERAL inches of snow over central / eastern TN central/ southern WVA much of VA MD DEL . But the GFS Model was " alone" in forecasting this.

New DATA here early Sunday AM from the Canadian and new European Models now strongly support the GFS idea of snowstorm with significant accumulations ( for early March) for TN WVA VA MD DEL and possibly Northern NC

All that being said there are still a lot of questions here. For example one LEY question is ... how much precipitation comes in behind the front once temperatures turn cold on Thursday morning?

Another uncertainty Hass to do with how long does this precipitation last? Right now most of the models are showing the significant precipitation behind the front if in the cold air which is what produces the snow . But this is not at all certain.

There does not appear to be a significant surface area of low pressure. This is simply a slow moving front with the Jetstream driving moisture in behind the front.

it is possible that the cold front could stall further to the north which would shift the heaviest snows over Northern West Virginia Washington Baltimore Maryland Pennsylvania and New Jersey.

All those questions aside... Right now the model data does support the idea of another significant accumulating snow fall over the lower Middle Atlantic region as well as southeastern half of Kentucky and much of Tennessee MARCH 5.

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11011779_825904897456770_636120970414466
 
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Yep, that's a ZR/SN event for ATL verbatim. Considering how...bad...the GFS has been the last two events, I'll wait until this shows up on the RGEM, UKMET, and the NAM before I start sounding the alarm.

 

I do like the GFS's consistency on this idea, though.

 

 The 0Z GFS has extremely light wintry precip. at most for ATL verbatim on 3/5. I continue to expect this to be minor at worst in ATL based on history. Once the below 32 air finally gets over the mountains to the W/NW, I expect the precip. to either be gone or just about to end. Besides slowing the cold air down, the mountains have a drying effect. ATL hardly ever scores anything of significance in these setups.

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***ALERT *** ACCUMULATING SNOWSTORM THREAT MARCH 5.. FOR THE LOWER MIDDLE ATLANTIC ... MARCH 5 not sunday !!! MARCH 5 NOT sunday

MD DEL VA WVA and POSSIBLY Northern NC ..

southeast Third KY

western/ central TN

...

There is going to be a 1 DAY WARM UP .. . Wednesday MARCH 4 Up and down the East coast. 60s are likely over the Lower Middle Atlantic... 40s / 50s into Northern Middle Atlantic and southern New England (Philly to NJ to NYC to CT to se Mass).

a new STRONG Arctic cold front will arrive from the Midwest Wednesday night / Thursday Am. The front will Slow down as it reaches Northern GA SC NC. The 12z SATURDAY GFS Model shows a 2ND round of precip move up the front into TN WVA VA MD DEL after reaches NC. This results in SEVERAL inches of snow over central / eastern TN central/ southern WVA much of VA MD DEL . But the GFS Model was " alone" in forecasting this.

New DATA here early Sunday AM from the Canadian and new European Models now strongly support the GFS idea of snowstorm with significant accumulations ( for early March) for TN WVA VA MD DEL and possibly Northern NC

All that being said there are still a lot of questions here. For example one LEY question is ... how much precipitation comes in behind the front once temperatures turn cold on Thursday morning?

Another uncertainty Hass to do with how long does this precipitation last? Right now most of the models are showing the significant precipitation behind the front if in the cold air which is what produces the snow . But this is not at all certain.

There does not appear to be a significant surface area of low pressure. This is simply a slow moving front with the Jetstream driving moisture in behind the front.

it is possible that the cold front could stall further to the north which would shift the heaviest snows over Northern West Virginia Washington Baltimore Maryland Pennsylvania and New Jersey.

All those questions aside... Right now the model data does support the idea of another significant accumulating snow fall over the lower Middle Atlantic region as well as southeastern half of Kentucky and much of Tennessee MARCH 5.

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11011779_825904897456770_636120970414466
 

 

lets shift this a little more to the southeast fellows.

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Really!...where are the bloody 70's I was promised.

 

Going to call bull on this event, what a nutty setup the models are showing.  Huge cold front that swings through with a wave rolling over it dropping a ton of snow.  Oh yeah, I guess that's happened a coupe of times in the past couple of weeks....

 

 

post-2311-0-04710500-1425214049_thumb.pn

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surprised GSP isn't mentioning the possibility of snow for Thursday from what the models are showing and some of the mets on here are talking for Thursday.

I'm not! Did you see what happened with the last event they busted on!? What could go wrong withe the Thursday set up, besides everything ! Cold air coming over the mountains to beat moisture or to join moisture that is coming, always works! Anybody around GSP expecting snow or ice from this setup, will be sorely dissapointed !
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GFS backs off while the Euro comes in with more snow. Guess the important thing is the models are still showing a storm. Just not feeling this one yet, but it looks like a different setup than we had with the last system. Crazy to think we could be close to 70 the day before.

 

It did...

post-2311-0-27136600-1425220103_thumb.pn

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for the SE, this a west of the Apps special (and they deserve it) - maybe some snow for NC - GA/SC are the losers here (I think I've heard Cessarich say the Apps/Blue Ridge "protect us" from events like this)

I used to live in Memphis/Nashville and this set-up is a jackpot for TN

Our only hope is , the air gets over the mountains up North in like WV or VA, and wedges down to our area. It wouldn't hurt to slow or delay the wave development to allow more cold air to get out in front. Grasping at straws, but in the 80s and 90s , there were days when we started out in 50s and 60s in the morning and had freezing rain or sleet by the afternoon, so anything is possible . I give us about 10% chance of seeing frozen on Thursday
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6Z GFS appears to be driving a low right up I-95, which would bode well for the Foothills and mountains. Not sure how it gives folks east of that anything but cold rain. What am I missing?

 

Backdoor cold front/anafront coupled with some lee side cyclogenises could be a decent solution for northern parts of NC.

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for the SE, this a west of the Apps special (and they deserve it) - maybe some snow for NC - GA/SC are the losers here (I think I've heard Cessarich say the Apps/Blue Ridge "protect us" from events like this)

I used to live in Memphis/Nashville and this set-up is a jackpot for TN

I certainly hope so but been here before only to witness the storm go South of us to visit the Deep South, for example, last week

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