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January 2019 Discussion II


Typhoon Tip

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Just now, OSUmetstud said:

Yea but the majority of zr icing efficiency is explained via rates. Wet bulb temp and wind are also important but not as important as rate. 

Sure. Never said it wasn't. You really want a prolonged -ZR or ZL event to go epic with the accretion...a la 98.

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5 minutes ago, ORH_wxman said:

Right but you can still get refreezing of the rain drops when you have a deep cold layer...esp when the min temp in the cold layer is below -6C. In this case we'd prob have cold layer at least -9C or -10C. So you want to really warm that raindrop up to prevent it from refreezing on the way down. 

I've read in papers that once you get that warm layer to about +6 or +7, it becomes pretty hard to refreeze. 

Yeah....I think -8C in the cold layer is that general cutoff between reforming sleet and just having supercooled drops.

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2 minutes ago, powderfreak said:

Yeah that's merely QPF as ZR/IP.  

But still, after 4-8" of snow another 1-2" QPF IP/ZR is a huge impact event if that's what someone gets.  

850s were toasty but SFC frigid...I mean 850mb freezing was up near CON on that Euro run while it's below freezing at the SFC to like the south coast. 

One consistent feature on all these solutions is the Arctic high situated to the northwest and an arm extending north of us. That basically makes it impossible to get rid of the low level cold even near the coast because it gives us an ageostroohic flow out of the northwest. The only way would literally be to have the trough become so amped that we get the low to rip into NY state or something. Otherwise it's pretty hard to see any way we avoid wintry precip of some kind.  

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8 minutes ago, weathafella said:

Link?

actually it was end November 1921 ... not '26 ... 

Yeah it's out there... here and there. It doesn't appear to be heavily annulled but accretion depths exceeding 3" was reported over "eastern and central massachusetts" so.. 

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17 minutes ago, ORH_wxman said:

There's going to be no wet snow with this storm. Low levels are absolutely frigid. 

I agree on leaning more toward sleet than ZR though. Typically an airmass this cold will want to sleet. We will really need to torch the midlevels really high. Prob like +6-8 at minimum to get ZR because the arctic layer is so cold and pretty thick near the ground. 

Is there anyone in particular most susceptible to ice in this set up..? Like CT ?

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1 minute ago, Typhoon Tip said:

actually it was end November 1921 ... not '26 ... 

Yeah it's out there... here and there. It doesn't appear to be heavily annulled but accretion depths exceeding 3" was reported over "eastern and central massachusetts" so.. 

Lol...about to have a 100 year ice storm.

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Just now, HIPPYVALLEY said:

Wasn't 98 days of freezing drizzle?  

And light steady ZR too mixed in. I remember the radar looking showery at times. Even some embedded heavier showers. But it was literally like 4 days worth of it. Obviously this is a different setup. 

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Just now, STILL N OF PIKE said:

Is there anyone in particular most susceptible to ice in this set up..? Like CT ?

Yeah CT and RI are prob more susceptible (as currently modeled)...they will be closer to the warmest midlevels but they will have zero chance of warming above freezing with strung out sfc low moving to their southeast. 

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Just catching up in the thread.  Glad it's pretty safely just snow up here. Some damaging ice wherever that sets up.  Arctic cold afterwards to add to misery. The Euro and GFS diverge as to what might happen mid next week and beyond, Euro offering temps above freezing by mid next week for some melt.

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