Monday, January 20, 2014

Another January Snowstorm With Bitter Cold Temperatures

Unfortunately, this snowstorm was a ‘surprise’ for many, despite the best model (EURO) having it within its cross-hairs since Wednesday.  Regardless, this storm will be similar to the earlier January snowstorm with up to a foot of snow and very cold temperatures expected.  This storm will bring bitter cold temperatures, negative wind chills, plenty of snow, and some gusty winds.

Temperatures and Wind
First, tomorrow will see plummeting temperatures as they near 20° throughout the day, then drop to around 10° overnight, with wind chills below 0° or even approaching -10°.  Temperatures for Wednesday will remain in the teens will not make it above 30° until Saturday, most likely.  Furthermore, the winds that will be creating these severe wind chills will be occurring tomorrow and into tomorrow night, as they gust up to 30mph.

Timing
Snow showers begin to move in around the mid- to late-morning hours tomorrow from the south and west to the north and east.  The main bulk of snow occurs during the afternoon and into the evening.  The snow tapers off overnight during the early Wednesday morning hours.

Snowfall
Finally, snowfall amounts are pretty much a general 6-12” across the state, except extreme Northwestern New Jersey, where they will likely be clipped by the storm but will still receive very measurable snow.  I placed a swath of 8-14”+ snowfall along the I-95 corridor and to the south and east where the heaviest snow and banding is likely to occur.  I added in the ‘+’ because some information is pointing to the possibility of over a foot of snow in some regions of NJ, likely within this area.  One model and its runs are saying, for example, that Northeast Philadelphia Airport could receive up to 20” of snow, so that cannot be completely ignored or ruled out.  Therefore, I believe that there is a chance that this storm really goes ‘BOOM’ over southern and central New Jersey.


My Projected Snowfall Map






Wednesday, January 1, 2014

Snowstorm to Bring Measurable Snowfall and Arctic Air

This storm has been picked up by the models for several days now, but the exact aspects of the storm have been all over the place, namely snowfall totals and their locations.  There is a high bust potential with this storm because it essentially has not formed yet, so the chance is still there to see lower-than-expected snowfall.  However, one thing that has never really changed has been the bitter cold, Arctic air that will invade the region behind the storm.  The temperatures and wind chills behind the storm may actually end up being the main talking point of this system.   


Source: http://www.erh.noaa.gov/phi/

Most of our area is placed under a Winter Storm Watch by the National Weather Service in Mt. Holly due to the potential for snow accumulations that could impact travel.


How?
Essentially, two pieces of energy, one from the Midwest and one from the south, will phase (or merge) off of the Mid-Atlantic/New England coast and essentially explode into a snowstorm.  What is important for our area is how quickly this merging happens and where it happens.  Due to these factors, we will not see the full brunt of the storm because of this phasing occurring too far away from our area, but we will still see measurable snow. 



Timing
As the systems phase off the coast and a transfer of energy occurs, our area could experience scattered snow/rain showers during the day tomorrow (Thursday).  However, as the storm forms off the coast and strengthens, the dry slot over New Jersey will fill in with snow.  Therefore, the bulk of the snow will begin to fall after sunset and persist overnight, when the heaviest of the snow will fall.  The moderate/heavy snowfall will wane into lighter snow during the morning and clear out by Friday afternoon.

Snowfall Totals
            As I stated before, snowfall amounts have been all over the place up until now, but the models have begun to converge a bit.  Snowfall amounts, with this storm, will depend on a number of factors.  First, it depends how long the slot of dry air before the snowfall lasts…of course, the quicker it fills in, the more snow we receive.  Second, the liquid to snow ratio is another factor, which means that the colder the temperatures are, the more snow that accumulates per amount of liquid.  Third, where exactly does the phasing occur, which means that the closer the two pieces of energy merge, the higher the snowfall intensity that we see.



Temperatures

            Finally, as previously stated, temperatures could become the main talking point out of this system.  Behind the storm, winds out of the north and west will usher in Arctic air.  Tomorrow will see a high in the mid-30’s, then as the storm moves through, temperatures plummet overnight into the mid-teens, which last throughout the day on Friday.  Wind chills overnight and Friday will be near or even below 0°.  Friday night into Saturday will bring a low in the single digits and temperatures in the 20’s throughout the day on Saturday.

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