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NYC/PHL 12/21-12/22 Threat


hazwoper

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These norlun/inverted trough events can be very sneaky and often surprise with a light to moderate snowfall. I recall the January 28th, 2007 norlun quite well as we hit the jackpot in Monmouth county with nearly 5" of snow. Sfc low pressure well offshore, 250-300 miles or so, but another disturbance to its west created a tongue of low level convergence in CNJ. Ended up being a nice light 4-5" snowfall here.

http://www.njfreeways.com/weather/2007/28-Jan-07-SurfaceMaps.html

Not saying it'll happen w/ this one, but don't expect models to have a good handle on the axis of most intense snow or the duration of it. Looks like it's going to come down to watching radar trends tomorrow as norluns are pure nowcast. We see the latest data is sniffing out the NW-SE tongue of pcpn extending toward CNJ/NYC/LI, a classic orientation. But I wouldn't be shocked if current QPF is a bit underdone especially in the areas the receive the brunt of the norlun - again - could be eastern LI, southern NJ, NYC, etc. Most likely it's somewhere on the LI, but overall we need to be on the look out for a light snowfall.

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Very positive run from the 00z GFS for the XMas Event, its also slower, and has more energy coming out of the Southwest. The 00z NAM was similar at 84 hours as the GFS @ 84 hours, so it has support. The two questions to me is how much energy comes out, how far north does the low form, and I guess a third would be how much confluence there is to shear it out.

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How is this upcoming setup different than this past event? Because at 150+ hours we were cheering things the models were deppicting as well.. So basically my question is, what makes this upcoming event more likely than perhaps this past event that as we are currently witnessing exiting WIDE right..

Jeff

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How is this upcoming setup different than this past event? Because at 150+ hours we were cheering things the models were deppicting as well.. So basically my question is, what makes this upcoming event more likely than perhaps this past event that as we are currently witnessing exiting WIDE right..

Jeff

Well Id say there is more energy associated with the STJ here, less confluence, and less phasing that needs to occur

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How is this upcoming setup different than this past event? Because at 150+ hours we were cheering things the models were deppicting as well.. So basically my question is, what makes this upcoming event more likely than perhaps this past event that as we are currently witnessing exiting WIDE right..

Jeff

The GFS never had that storm as consistently as it has this one.

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