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Feb 8th-9th Potential Significant Coastal Storm


dryslot

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So it is still not clear which areas with which QPFs stay all snow?  Is Boston half rain or something?

I think that Boston stays mostly snow, maybe mix to the south rain wont be a huge problem still 12-18 inch amounts if I had to make a call at this time. You will still  have to keep an eye on the latest developments. 

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I think that Boston stays mostly snow, maybe mix to the south rain wont be a huge problem still 12-18 inch amounts if I had to make a call at this time. You will still  have to keep an eye on the latest developments. 

Again -- how does 3.0" of QPF translate into 12-18 inches?  Are we really talking halved snowfall accumulation rates?

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Cape Cod, MA would be the jackpot if it wasn't for the mixing we get.  We are getting more then the 1-3" currently forecasted by WHDH and NECN, NWS has us at 8-10" and I think thats still conservative.

I think it would be helpful to take the :weenie: imby comments like this to the banter thread.

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true... i just think it would be a much "cooler" event to be in being in the Boston metro.. 

 

Well, then Boston is your place I'd say. I don't see how Boston doesn't get hammered at this point. The only question is really whether its a 12-18 event or 20"+....the guidance is trending toward the latter.

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Again -- how does 3.0" of QPF translate into 12-18 inches?  Are we really talking halved snowfall accumulation rates?

I've already answered this, 3" QPF is just model output, it's not guaranteed. You can't forecast just on model output alone, and definitely not smart to forecast record breaking snows at this lead time.  Start at 12-18" adjust higher as we close in on the event if the models maintain such high QPF and it makes sense given the evolution of the storm.

 

We need 5h to close off just like it does on the models right now to wring out this type of QPF, if that doesn't happen (which is certainly in the realm of possibilities at this point) we'll be back down from these historic totals. You get some egg on your face if you hype 24"+ and it doesn't deliver. Relax on the forecasts, if the models hold they will adjust higher.

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Again -- how does 3.0" of QPF translate into 12-18 inches?  Are we really talking halved snowfall accumulation rates?

If it were as easy as taking modeled qpf and plugging in 10:1 it would be easy. But there's a presumption that qpf may be overdone somewhat and were 60 hours out so 12-18 is a much more reasonable starting point.

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Another fantastic run. Some qpf figures from the 12z ECMWF:

Augusta: 1.42”

Bangor: 1.10”

Bedford: 2.87”

Berlin: 1.24”

Beverly: 2.82”

Boston: 2.97”

Bridgeport: 1.56”

Chicopee Falls: 1.72”

Concord: 1.96”

Danbury: 1.41”

Fitchburg: 2.51”

Groton: 2.17”

Hartford: 1.79”

Hyannis: 2.58”

Jaffrey: 2.05”

Keene: 1.65”

Lebanon: 1.20”

Lewiston: 1.58”

Manchester: 2.32”

Martha’s Vineyard: 2.71”

Milton: 3.03”

Nashua: 2.43”

New Haven: 1.68”

Pittsfield: 1.38”

Plymouth: 2.89”

Portland: 1.99”

Portsmouth: 2.44”

Providence: 3.04”

Taunton: 3.06”

Westfield: 1.70”

Worcester: 2.54”

Note: Not every city receives all snow. Some areas see at least a period of sleet and/or rain.

Thanks. Very helpful to have samples for that many locales.

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Again -- how does 3.0" of QPF translate into 12-18 inches?  Are we really talking halved snowfall accumulation rates?

Remember that the 3.0" QPF is just the output of the models at this point, 12 to 18 inches is just a conservative estimate at this point. 

If we do see the 3.0" of QPF we could see more that 18 inches. 

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The location and tracks of the 850mb and 700mb centers will determine if we mix and how long if we do mix it lasts.  GFS is a tad warmer then the NAM with the 850mb center traveling very close to the Islands.  700mb center is pretty much agreed upon.  If 18z NAM holds serve we can pretty much get a handle on where these features will be.  After the 00z runs we are looking at warnings being issued given that the storm starts THursday evening.

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