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Box not dismissing tomorrow in eastern MA, again emphasizing decent lapse rates and even some instability as ULL drags down colder air aloft:

 

Short term /6 am Sunday morning through Sunday night/...
*** minor snow accumulations possible tomorrow across eastern Massachusetts and Rhode Island ***

Tomorrow...

...

Between about 700 mb and h4...note 6-7c/km lapse rates and note even some minor surface instability near the East Coast of Massachusetts within the bl as lapse rates approach dry adiabatic.
...
With a north-northwest wind...the combination of the low level instability and some ocean enhancement could yield a brief period of moderate snowfall and potentially even briefly heavy as some of the middle level instability falls in the dendrite zone. It will require at least moderate snow to see accums on paved sfcs though as accums will mainly be on unpaved/untreated areas. However...given the chance for brief moderate/heavy snowfall low visibilities and light accums on area roadways can/T be ruled out across portions of eastern Massachusetts. A quick 1-2 inches /and possibly isolated higher amounts/ are not out of the question as models continue to indicate 0.10-0.30 of total quantitative precipitation forecast and mesoscale guidance simulated radar shows potential for heavy returns.

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Box not dismissing tomorrow in eastern MA, again emphasizing decent lapse rates and even some instability as ULL drags down colder air aloft:

 

Short term /6 am Sunday morning through Sunday night/...

*** minor snow accumulations possible tomorrow across eastern Massachusetts and Rhode Island ***

Tomorrow...

...

Between about 700 mb and h4...note 6-7c/km lapse rates and note even some minor surface instability near the East Coast of Massachusetts within the bl as lapse rates approach dry adiabatic.

...

With a north-northwest wind...the combination of the low level instability and some ocean enhancement could yield a brief period of moderate snowfall and potentially even briefly heavy as some of the middle level instability falls in the dendrite zone. It will require at least moderate snow to see accums on paved sfcs though as accums will mainly be on unpaved/untreated areas. However...given the chance for brief moderate/heavy snowfall low visibilities and light accums on area roadways can/T be ruled out across portions of eastern Massachusetts. A quick 1-2 inches /and possibly isolated higher amounts/ are not out of the question as models continue to indicate 0.10-0.30 of total quantitative precipitation forecast and mesoscale guidance simulated radar shows potential for heavy returns.

NAM is nice looking. 

 

All these above come into play...just a matter of where the band sets up. You'll need some good rates for it to stick on streets, but this has the look of a mesoscale band.

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NAM is nice looking. 

 

All these above come into play...just a matter of where the band sets up. You'll need some good rates for it to stick on streets, but this has the look of a mesoscale band.

 

Yeah doubt we have a good feel of these meso features before tonight at the earliest... at the moment seems to me best dynamics may be too far east for Boston metro (ie., better for north shore / south shore / southeast MA), but will be interesting to watch with the record unlikely but not impossible.

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