All model guidance have converged on yet another clipper system moving through the Ohio Valley, with coastal redevelopment, and initially a southwest flow set up. This will lead to widespread precipitation across New England by noon Sunday. The GFS and NAM have recently enhanced QPF significantly with around .5 to .75" through Sunday night. The ECMWF also supports the bombing clipper system, but is slower to moisten the antecedent dry air mass, and has lower QPF.
This will be a multi-faceted event. After the main round Sunday afternoon, a wave of low pressure will move north along a boundary associated with the clipper, spreading a second round of moderate to heavy precipitation, for mainly eastern New England up into Maine Sunday night.
Total water equivalent looks like .4" to 1.0" at this time. The axis of heaviest snow will lie across Hillsborough county through SE NH and into S ME. These areas could see upwards of 14 inches of snowfall. The rest of the region will likely experience widespread accumulations of 4" to 7".---
Contrary to a strange outlook for snow Tuesday 1/20 that I've been asked about a few times already, skies will likely be in the process of clearing, with only some light snow possible in the morning.
|posted by Sam Lillo @ 1/16/2009 09:32:00 AM
