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February 2025 Disco/Obs Thread


Torch Tiger
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9 minutes ago, Damage In Tolland said:

Our big icestorm is back . Not shocked 

not sure "big"  ...  it would be marginal warning ice amts do to the fast speed of the system. 

It will also depend how heavy it comes down and just how cold it is too.  It's a delicate thing that goes on in the thermal balancing between kinetic energy from falling heavy rain, vs dry DP feed, vs latent heat of phase change.  

There's a tug of war there.   The best accretion rate I've ever seen was a 19 F moderate rain with almost not pellets, which is bizarre and rare for that cold of a temperature to be clean rain.  Must have been pretty warm at cloud height... But being the dweeb that I am, I was studying the droplets as they impacted the car windows and there was pretty much zero loss.  Every drop froze almost instantly.    6 hours later it was 33 with just plain drizzle and lots of dripping.  

Ice "storms" need to have the 3 aspects above in a stasis over a longer period... the bigger events are typically 24 hours with another 2 days of intermittent continuance.

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Trend is of monster importance for the weekend... 

I've been saying all day that this was suspiciously too far W with all these canonical arguments that are valid for this scenario.   If there's a trend to go SE at all, it is like "more" important than the typical trend - if that makes any sense  ..

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6 minutes ago, Typhoon Tip said:

not sure "big"  ...  it would be marginal warning ice amts do to the fast speed of the system. 

It will also depend how heavy it comes down and just how cold it is too.  It's a delicate thing that goes on in the thermal balancing between kinetic energy from falling heavy rain, vs dry DP feed, vs latent heat of phase change.  

There's a tug of war there.   The best accretion rate I've ever seen was a 19 F moderate rain with almost not pellets, which is bizarre and rare for that cold of a temperature to be clean rain.  Must have been pretty warm at cloud height... But being the dweeb that I am, I was studying the droplets as they impacted the car windows and there was pretty much zero loss.  Every drop froze almost instantly.    6 hours later it was 33 with just plain drizzle and lots of dripping.  

Ice "storms" need to have the 3 aspects above in a stasis over a longer period... the bigger events are typically 24 hours with another 2 days of intermittent continuance.

I think once push comes to shove and we get within 12-24 hours there’s going to be zone in SNE somewhere of very significant ice 

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Euro actually has a decent cold tuck which flips NE MA back to ZR…but it just warms up a bit more prior to that than the GFS so there’s a period of rain. Trend to watch for sure though because a little earlier in the mesolow and it’s lights out over interior. 

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7 minutes ago, RUNNAWAYICEBERG said:

Not happening homie. Euro is a whiff too. Fast flow and compression along the EC. 

I’m not writing it off til Sunday / Monday unless things turn drastically worse. Still very close, it’s obviously a tedious setup now with the needed TPV phase but there’s still a chance. 

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10 minutes ago, ORH_wxman said:

Euro actually has a decent cold tuck which flips NE MA back to ZR…but it just warms up a bit more prior to that than the GFS so there’s a period of rain. Trend to watch for sure though because a little earlier in the mesolow and it’s lights out over interior. 

How’s euro for front end Saturday? Don’t have access to it yet on WB

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3 hours ago, powderfreak said:

We just don’t know!

All it takes is a cursory review of the 'pattern recognition' / 'emsemble mean' / 'why this time it's different' and resulting realities yielding melts, to know that the quoted statement is more true than not.  Lol

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4 minutes ago, Sey-Mour Snow said:

I’m not writing it off til Sunday / Monday unless things turn drastically worse. Still very close, it’s obviously a tedious setup now with the needed TPV phase but there’s still a chance. 

That’s the problem. We can’t phase streams effectively lately. Have zero confidence a tedious setup works out to our delight. 

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I'm figuring that at this time Sunday night I'll have a couple of new inches of wet snow pack on the seven or so inches left over from the previous couple of snowfalls we've had. A slight net gain which will turn into a solid block of ice by Monday morning. Several inches of snow Saturday-Saturday night (meaning 2-4; 3-5 max) will pack down during the rain on Sunday but it will be cold enough not to wash everything away.

My big problem is whether my grandaughter's first birthday party in our church hall in Southbridge will get cancelled again because walks and driveway won't get cleared in time for services for the second week in a row.

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