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1/15-1/16 waves of wintry "potential"


tombo82685

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Have fun with the sloppy wintry mix south of the 2-4" line. I'll be enjoying a nice cold rain IMBY :P

attachicon.gif20130115-16_MAsnowFinal.png

http://www.americanwx.com/bb/index.php/blog/16/entry-27-mid-atlantic-snow-forecast-for-january-15-16-onlyfinal/

i think thats a pretty solid map. I'm not expecting much here besides a little sleet and i could see the mid levels hurting the lehigh valley on snowfall

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Have fun with the sloppy wintry mix south of the 2-4" line. I'll be enjoying a nice cold rain IMBY :P

attachicon.gif20130115-16_MAsnowFinal.png

http://www.americanwx.com/bb/index.php/blog/16/entry-27-mid-atlantic-snow-forecast-for-january-15-16-onlyfinal/

 

Agree... solid.  Nice call.  Will be interesting to see if prolonged ice in northern MontCo, northern Bucks areas will necessitate a WWA also.  I-78 looks like the battle zone.

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Agree... solid.  Nice call.  Will be interesting to see if prolonged ice in northern MontCo, northern Bucks areas will necessitate a WWA also.  I-78 looks like the battle zone.

 

This is my concern as well. I have a straight shot up either 476 or 309 to get to work in Allentown. I may work from home tomorrow.

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Latest RPM has snow/mix from Quakertown/Pennsburg northward and 1-2" and looks realistic.  To be honest, matches Ellinwood's map pretty well.  2-4" range is just north of Allentown... south of I-80, but north of I-78.  Call it Lehighton to Nazareth line and points north.  Lollipop totals above 4" are in the eastern Poconos - Monroe/Pike counties into Sussex NJ with 4-6".

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12z ECM came in warmer - and not sure if it is credible at this range (mixed feelings about that among mets and hobbyists) and screams PL/ZR at ABE, 546 thickness to Hazleton, PA.  Scranton/Wilkes-Barre does well. 

It looks like it is significantly off at initialization being wayyyyyyyy too warm.  Hour 6 is now and has 32 degree line in upstate NY.  Not sure how much of a downstream effect it has on this run, or even if the ECM should be considered short range.  It is about +3C too warm at SFC initialization and off with that line by a good 150 miles.  Could be the weenie in me reaching though...

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Thanks Ray.  Any opinions on the ECM in response to what I wrote above with regard to initialization and do we consider it at this range?  Any merit to that or just a reach?

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Ice storm warnings down in the deep south right now. I still think the freezing rain is being underplayed for the NW PHL burbs as is generally the case until < 3 hours before the event starts. I'd say freezing rain advisories might be issued to the NW of PHL given cooler surface temps. Soundings indicate a stubborn CAD signal with NELY low level winds and sfc temps around freezing through 10am tomorrow for those 10+ miles to the W/N of PHL. Philly itself will probably be 33 or 34 and rain.

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Ice storm warnings down in the deep south right now. I still think the freezing rain is being underplayed for the NW PHL burbs as is generally the case until < 3 hours before the event starts. I'd say freezing rain advisories might be issued to the NW of PHL given cooler surface temps. Soundings indicate a stubborn CAD signal with NELY low level winds and sfc temps around freezing through 10am tomorrow for those 10+ miles to the W/N of PHL. Philly itself will probably be 33 or 34 and rain.

Models busting with the low level cold in KY now. 

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Thanks Ray.  Any opinions on the ECM in response to what I wrote above with regard to initialization and do we consider it at this range?  Any merit to that or just a reach?

 

EC has a tendency to be a bit warm at the surface.  Not a big bias, but 1-3F is not uncommon.

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Models busting with the low level cold in KY now. 

 

 

Interesting. From my recollection, most of our ice events tend to be "sneaky" in that the extent/strength of the cold air damming isn't detected until we're on top of the event or nowcasting.

 

I'm not saying we're looking at an all out ice storm as I don't think there's sufficient sfc high pressure up north. But I do think we'll see more ZR than expected for the interior.

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I think the advisory layout is appropriate. Wouldn't surprise if the rest of the N/W counties (Bucks, Mont, Ches) were added but I think they're good where they are at now.

 

Probably a situ where the immediate suburbs hang at 32 while UKT and PTW get to 31.

 

Key to note that the NAM shows most of the precip falling with temps at/above 32 at PTW.  A little bit while below.

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