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January Storm Term Threat Discussions (Day 3 - Day 7)


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3 minutes ago, losetoa6 said:

Not bad . Widespread area then I pretty much agree 

Maybe bump BECS to 30+ widespread 

I thought about that but how often does that happen?  Even at your yard.  30+ is just a tough milestone. I’ll take the HECS with a side of SECS.  

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20 minutes ago, snowfan said:

And w the 96 storm, many of us had a follow up snowfall later that week before the big flooding. 

        Some of us had two follow-up snowfalls.     B)

        That Friday was another synoptic snowstorm, but there was a vort that Tuesday afternoon that put down a band of heavy snow across DC and the east side of town.   I got another 6" out of that unexpected event.

 

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Pretty good disco from Mount Holly-

The High will slowly lift NE on Sunday as low pressure moves into the Ohio valley, and this system should follow the typical evolution with the interior low occluding and a secondary low beginning to take shape along the coastal front to our south late Sunday into Monday. At this stage, guidance essentially proposes two solutions in terms of the evolution of this system:

1.) A fairly progressive system in which the primary low reaches the Great Lakes before the "energy transfer" with the coastal system occurs (the coastal low doesn`t really get going until it is near our latitude in that scenario). This results in warm-advection driven wintry precipitation at onset which then changes to rain/mix for at least part of our area later in the event. With this solution most of the precipitation would occur late Sunday, with lighter precipitation persisting into Monday- Tuesday as the mid-lvl wave passes.

2.) A slower solution in which the energy transfer takes place upstream of our area, and the coastal low becomes dominant south of the area. The mid-lvl wave then further amplifies and closes off near the east coast on Monday, which then results in the surface low tracking slowly N-NE Monday into Tuesday. This solution could result in a fairly long duration precipitation event for portions of the Mid-Atlantic (at present most favored just south of us), and has a more potential from a winter weather standpoint given the longer duration, and more favorable thermal profiles with the low remaining to our south. While this scenario has the biggest "hit" potential, it also has some "miss" potential, as it is possible the the low doesn`t close off until the system is over the Atlantic which would track the system east of the area, resulting in our area only being on the fringe of any precipitation. Given the general trends/biases in guidance in the blocking regime that has prevailed the last couple months, tend to give a bit more weight to the slower/more amplified solution, so slowed down PoPS a bit. Also, despite the tendency for suppressed systems missing us to the south in this regime, this system will likely be amplifying near our region with diving northern-stream energy helping to reinforce it. Consequently made the decision to bump PoPs slightly to the likely range at least for the southern half of the area on Monday, but capped at 60 given the "miss" scenario described above.

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2 minutes ago, SnowDreamer said:

Look at that comma head tapping moisture out of the gulf. Love to see this! (Control)

eta: Heyo! 100th post :drunk:

 

18z cont pwat.png

That comma head will drop a foot of snow in less than 10 hours on those lucky enough to cash in.  December 2009 had a similar feature if i remember correctly

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