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December 6-7: Rainy Frontal Passage or a Wintry Wave?


moneypitmike

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BOX  thinks we all see some snow!  :snowing:

 

DETAILS...

THU NIGHT INTO FRI NIGHT...
AS SFC COLD FRONT SLIDES THROUGH THE REGION THU EVENING...IT WILL
SLOW TO A STALL AS IT BECOMES PARALLEL WITH UPPER LVL SW-NE FLOW.
AS IT DOES SO...A SERIES OF WAVES WILL MOVE OVER FROM THE SW. THE
FIRST ARRIVING DURING THE MORNING FRI. THERMAL FIELDS REVEAL THAT
SFC-H9 TEMPS REMAIN ABOVE 0C...SO SUSPECT A ROUND OF RAIN SHOWERS
WITH THIS INITIAL WAVE. AFTER A BRIEF LULL LATE FRI AFTERNOON...A
SECOND...AND MORE POTENT WAVE WILL SLIDE E...PULLING IN SOME COLD
AIR AS IT DOES SO. THERE IS REASONABLE AGREEMENT THAT THE -2C H92
LINE WILL REACH THE S COAST BY ABOUT 12Z SAT. SO...EXPECT A CHANCE
OVER TO WINTRY PRECIP FROM N TO S AS THIS WAVE PASSES. THE BULK OF
THE LIFT/QPF WILL BE DURING THE OVERNIGHT HOURS...SO SOME
ACCUMULATING SNOWFALL IS POSSIBLE. QPF VALUES AVERAGE AROUND 0.5
INCHES...THANKS TO A COMBINATION OF 1-1.5 INCH PWATS BUT A FAST
MOVING OPEN WAVE.

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I'm not a fan of these events, especially along the coast waiting on colder air to advect in while hoping precip doesnt dry out first. With that said, the euro is enticing enough that you got to give it a chance, though I'd think the GFS solution is more realistic.

 

Certainly just inland across southern NY, CT, MA there is hope you can pull off a quick burst of accum.

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I'm not a fan of these events, especially along the coast waiting on colder air to advect in while hoping precip doesnt dry out first. With that said, the euro is enticing enough that you got to give it a chance, though I'd think the GFS solution is more realistic.

Certainly just inland across southern NY, CT, MA there is hope you can pull off a quick burst of accum.

Yup...I lean pessimistic with these too. The front goes through and you feel optimistic, but then you wait for hours in the 30s with rain. There will probably be an IP transition in there too...some soundings keep H8 a hair warmer for longer than H85 too. We'll see I guess. I'd lean with the higher terrain of interior CNE/SNE with the best shot for a couple of inches of glop.
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Yup...I lean pessimistic with these too. The front goes through and you feel optimistic, but then you wait for hours in the 30s with rain. There will probably be an IP transition in there too...some soundings keep H8 a hair warmer for longer than H85 too. We'll see I guess. I'd lean with the higher terrain of interior CNE/SNE with the best shot for a couple of inches of glop.

 

I'll take glop if I can get it.

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I'm not a fan of these events, especially along the coast waiting on colder air to advect in while hoping precip doesnt dry out first. With that said, the euro is enticing enough that you got to give it a chance, though I'd think the GFS solution is more realistic.

 

Certainly just inland across southern NY, CT, MA there is hope you can pull off a quick burst of accum.

 

 

Yup...I lean pessimistic with these too. The front goes through and you feel optimistic, but then you wait for hours in the 30s with rain. There will probably be an IP transition in there too...some soundings keep H8 a hair warmer for longer than H85 too. We'll see I guess. I'd lean with the higher terrain of interior CNE/SNE with the best shot for a couple of inches of glop.

 

 

Looks like a lot is hinging upon this second wave developing along the frontal boundary after it's cleared the area being able to pull in some Atl moisture.  So timing would be critical as well.  If the follow up wave speeds up there won't be enough time to cool the temps enough and if the timing is slowed too much it risks the possibility of be shunted off to the S and E.

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Will/Phil/Scott  what's your take on Friday up in the hill country?  Sunday River, Loon etc?

 

 

 

 

It looks nasty...probably 30s and light rain early in the day and it cools down as the day goes along with rpobably some light snow in the afternoon. Hard forecast because the timing of the front sagging SE.

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Yeah that impulse has borderline advisory level snows in the southern Greens over into adjacent NH, especially the higher terrain that can switch over a little easier.

NAM is holding steady with having the most precip after cold air sneaks in.  12Z GFS looks  little better.  The fast flow is a killer.  Southern Greens do look like a decent place to be if precip doesn't get pushed south and east to quickly.

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