But we won't have much to show for it. A storm developing south of the region today will move northward, in the warm sector of a storm to the northwest. Overrunning precipitation will move into New England. Despite such a chilly start to the day, temperatures will rise quickly on warm advection, allowing precipitation to fall as rain for most of southern New England this afternoon. For southwest New Hampshire, a few hours of wet snow is possible before the changeover, however, no more than an inch of accumulation is likely.
The system to the northwest is dragging a strong cold front through the Great Lakes and northern Plains. Arctic air is streaming south behind the front. A shortwave in the southwest will pick up a lee trough in Colorado, moving it along the front into the Great Lakes by Tuesday. The best lift will likely be north of the region, limiting southern New England to more showery precipitation. Again, warm advection will allow most of the precipitation to fall as rain.
Behind this storm system, the arctic front will push through, with H85 temperatures dropping down to near -20C by Wednesday afternoon. Expect high temperatures on Thursday to struggle into the low 20's.
|posted by Sam Lillo @ 12/13/2009 09:27:00 AM
