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Feb 8-9th Miller Boom or Bust Disco


Bob Chill

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Let me state it this way....medium range NWP skill is now comparable in the NH and SH.  In the SH, we have so few raobs and aircraft-based data yet can produce skillful medium range forecasts.  Our current global observing system for the atmosphere is robust and redundant.  I'm talking mostly about synoptic-scale type stuff here.

 

When you start getting into mesoscale and smaller, of course you need much higher fidelity in space (horizontal and vertical) and time; and need things like radars, etc.

 

We have a winner.

 

I've learned something today. I always like when that happens.

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I think it's a little early to be killing this. Gotta give it to Sunday. These runs 3+ days out are good for nothing but practice imho since jackpotting now isn't very enviable.

I think so too. I thought 18z would have produced a better outcome based on h5 but it didn't. We need to give it more time.

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I'm familiar with March 2013 fiasco of course...but you've mentioned that December 2013 date before.  I cannot recall that one exactly...but have a vague memory that there was some hope of a "second wave" along a front (a day or so after we got some ice/rain), which never materialized really.  Is that the one?

 

At least in this case, we're seeing the fail earlier well before it happens, whereas for March 2013 it hit us right at game time essentially!

 

12/10/13, we were under a WSW for 4-7".  Modeling was pretty solid and the track was a good one.  BL and sfc temps were an issue in the city and immediate suburbs and everyone kind of ignored it.  The system never became dynamic enough down here to overcome it.  We ended up with -SN at 33 that never really got going.  I got 0.5".  Westminster/Winchester got nailed of course because they got under a really good band.

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Probably.  We'd do just as well hoping for a miracle with that first system.

That probably wont work either, but its really hard to see that low getting out of the way in time for the following wave to get in a good spot and deepen(which it may do, but likely too late). I cant recall an evolution quite like this, or at least one that worked out for our area. We generally don't do well with complicated/convoluted setups, and especially when its a miller B type deal, which are always high risk for failure.

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I think it's a little early to be killing this. Gotta give it to Sunday. These runs 3+ days out are good for nothing but practice imho since jackpotting now isn't very enviable.

 

If you read between the lines "killing it" means it's dead until the next model run that brings it back with the 0z suite. 

 

We really don't have any idea how this is going to break in the end. Other than writing off a well developed synoptic storm I don't see how a definitive call right now makes sense. 

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That probably wont work either, but its really hard to see that low getting out of the way in time for the following wave to get in a good spot and deepen(which it may do, but likely too late). I cant recall an evolution quite like this, or at least one that worked out for our area. We generally don't do well with complicated/convoluted setups, and especially when its a miller B type deal, which are always high risk for failure.

Maybe early Feb. 2009 would be something similar. That was the system that produced localized 8-10 amounts in southeastern PA in Lancaster county while areas only 10 miles away got literally nothing. 

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If you read between the lines "killing it" means it's dead until the next model run that brings it back with the 0z suite.

We really don't have any idea how this is going to break in the end. Other than writing off a well developed synoptic storm I don't see how a definitive call right now makes sense.

I think we need a weenie handbook with detailed instructions. Otherwise, innocent lives may be lost. Lol
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12/10/13, we were under a WSW for 4-7". Modeling was pretty solid and the track was a good one. BL and sfc temps were an issue in the city and immediate suburbs and everyone kind of ignored it. The system never became dynamic enough down here to overcome it. We ended up with -SN at 33 that never really got going. I got 0.5". Westminster/Winchester got nailed of course because they got under a really good band.

Yeah that was the first big snow at the house, I think I picked up 7-8"

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I think so too. I thought 18z would have produced a better outcome based on h5 but it didn't. We need to give it more time.

 

I think expectations should have been low from the start. Its a miller B. Threading the needle 100+ hours out, its really just entertainment. Yesterday's runs looked nice but when you see a very small strip of precip with no margin or error, not to mention temp issues, you just know it likely won't work.

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Too many factors have to tick just right for this to work. I don't remember seeing a lot of systems spin up like this behind a large storm system like the one that's progged.

It's not common but I think it's more common in El Niño than other winters. The first sys is rather intense tho.
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Hell yeah, and that's a good shift east for one run. Hopefully it's the start of getting that low moving on.

Mean low actually looks pretty similar timing and track wise. It's just drier around here. Think it's a little weaker mainly.

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