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Thanksgiving Weekend Weather (Wed-Sun)


ORH_wxman

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NAM has a pretty sharp precip gradient on the NW side compared to the other models. Is this part of its bias?

Edit: Because I've noticed in many events it likes to really cut down on amounts around the fringes especially on the NW side of the precip shield.

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A further SE solution like the NAM also hangs back a nice inverted trough as the mid-levels really cool down...there could be weenie snows on Thanksgiving morning over eastern areas if that happened (kind of a mini version of what happened on 12/20/08)

 

Something that wouldhave to be watched if we got a solution closer to that.

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It's a Maine winter in the early going this season.

 

BOX still hasn't updated.  Why do they stick to the schedule given the significant impact this storm will have?

 

Perhaps because 1) they're not going to change it at the drop of a hat, and 2) the storm's not for another 36 hours and 3) that's a weenie map.  I think the general public put in their address to the p/c and say "oh, it's going to snow".

 

NAM has a pretty sharp precip gradient on the NW side compared to the other models. Is this part of its bias?

Edit: Because I've noticed in many events it likes to really cut down on amounts around the fringes especially on the NW side of the precip shield.

 

Oh no.  Say it isn't so.   :)

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A further SE solution like the NAM also hangs back a nice inverted trough as the mid-levels really cool down...there could be weenie snows on Thanksgiving morning over eastern areas if that happened (kind of a mini version of what happened on 12/20/08)

 

Something that wouldhave to be watched if we got a solution closer to that.

interesting that 08 showed up on a lot of analogs last week and this

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Ok.

You wait on that 1.5" of qpf at Boston.

Let me know how that works.

 

I will note this: the point and click for downtown Boston has shifted favorably:

 

  • Tuesday Night A chance of rain, mainly after 5am. Partly cloudy, with a low around 38. West wind around 8 mph. Chance of precipitation is 30%.
  • Wednesday Rain before 3pm, then snow. High near 39. Northwest wind 6 to 13 mph becoming north in the afternoon. Chance of precipitation is 90%.
  • Wednesday Night Rain and snow, becoming all snow after 9pm. Low around 31. Chance of precipitation is 90%.

That's a more snow-heavy look than what we saw earlier today.

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NAM please.

 

 

 

Scott/Will etc.... is there really any play here for the SE areas or is this just too early and too "big" of a storm for snow down to the coast?  I haven't paid much attention but assume this is the more typical paste job for areas in interior SE NE like the usual Easton/Mansfield/Foxboro to Randolph type belt and N&W?

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Any thoughts on start time for this whole mess? Seems like everything keeps trending earlier. Yesterday it looked like things didn't get underway until afternoon. Today we seem to have a pretty good consensus that precip could be into southern CT by daybreak and making it up to the Pike by 8-9am. I feel like 5-9am start from south to north would cover it right now...any chance that continues to trend even earlier and really threaten the morning commute?

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1.41 * .1/3 = .96, even the Euro is 1.2, show me a link to verification scores that say cut the Nam by 1/3

 

Ray's claim has got some science behind it...look at the NAM bias when it predicts 1.5" of qpf at 60 hours out...the bias is 1.5 (or even slighter higher) which means the forecast to observation ratio is 1.5...so slice by 1/3 to get to reality:

 

 

m3_60h_nec.gif

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Scott/Will etc.... is there really any play here for the SE areas or is this just too early and too "big" of a storm for snow down to the coast?  I haven't paid much attention but assume this is the more typical paste job for areas in interior SE NE like the usual Easton/Mansfield/Foxboro to Randolph type belt and N&W?

 

I don't hold out hope for your area. The NAM perhaps flips you at the end, but hope for coating and anything else is gravy. It's just not a cold airmass...my expectations are low where I am as well..nevermind near the canal. You'll get yours this winter.

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Ray's claim has got some science behind it...look at the NAM bias when it predicts 1.5" of qpf at 60 hours out...the bias is 1.5 (or even slighter higher) which means the forecast to observation ratio is 1.5...so slice by 1/3 to get to reality:

 

 

m3_60h_nec.gif

I stand corrected , gFS is not far behind, what about the Euro? do you have the 48 hr numbers, also that means it nails .75 prediction at 60 hrs, so you only cut it by 1/3 rd when its 1.5 and greater???

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SO AFTER PULLING OUT ALL MY HAIR...INTANGIBLES NOTED ABOVE MAKE THE

SNOWFALL FORECAST TEDIOUS. FEEL DURING THE DAY SNOW ACCUMULATIONS
WILL OCCUR AT 32-DEGREES OR BELOW WITH SNOW OCCURRING AT 36-DEGREES
OR LOWER. THIS LOWERED SNOWFALL AMOUNTS FROM THE PRIOR SHIFT. IN
COLLABORATION WITH WPC...BROAD AREA OF 6+ INCHES WITHIN THE WATCH
AREA W OF NW MA TO NW RI ENCOMPASSING ALL OF CT EXCEPT COASTAL
COMMUNITIES. AMOUNTS AROUND 8-10 INCHES POSSIBLE ACROSS THE HIGHER
ELEVATIONS WITH LOCALLY HIGHER AMOUNTS.

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