Forecast Issued: 2/7/12
Tuesday 5:00 PM
For: The Delaware Valley Region
A rather strong s/w (Shortwave) will move into the M/A Region during Wednesday. As this s/w approaches, clouds will increase early Wednesday morning. Some light rain and snow showers, will move into the Delaware Valley by mid afternoon and spread east to the coast by later in the day.
As this s/w trough reaches the coast later in the day, and weak coastal low will develop just offshore and could enhance our precipitation during the early evening hours. At this time all precip should be in the form of light snow as temperature fall into the lower 30's.
So, I'm forecasting some rain and snow showers during the afternoon hours, changing to a period of light snow, mainly between 5:00 PM-9:00 PM Wednesday evening. A general Coating to 1" of snow accumulation can be expected across much of the Delaware valley region during Wednesday evening !
This does not include Southern DE and Cape May Co NJ, where little or no accumulation can be expected due to some rain mixed in and temps in the mid to upper 30's during the early evening hours.
A few isolated spots could see 1"-2" in the far western suburbs of PHL towards LNS and RDG PA. This mainly for areas that could see brief periods of moderate snow during enhancement of precip early Wednesday evening as the s/w energy and vort max move over our area. As mentioned earlier, a developing weak coastal storm off the M/A could aid throwing back some additional moisture before departing out to sea.
I'm also becoming very interested in Saturday and Saturday night time frame !
A minor snow event is looking synoptically likely for our area.
A Strong Cold front and large u/l trough with CAA combined with a developing Coastal storm offshore, could produce a norlun type trough and added moisture. A 1"-3" type event is not out of the question on Saturday, stay tuned !
Regardless, much colder weather will settle in from Saturday through Monday with Highs only in the mid 30's and lows in the upper teens and low 20's.