Tuesday / Wednesday Storm (Monday Afternoon Update)

I am actually quite impressed with this storm, and we are still 18 hours from go time. Models have been very consistent with this storm, so confidence is pretty high with this one. One thing that has been showing up on the models once again today is the effects of the banding that will setup. To illustrate that, here are two models depicting banding. Now, where exactly they set up will be the mystery. I am also very confident they will setup across NJ. The first model here is the RGEM model (Canada) showing a band setting up across central areas of NJ (yellow stripe). 

The second is the NAM (American)  model. Now, this is a 1 hour shot of a potential band (yes, that's 3.5" per hour) in the speck in Monmouth / Ocean County. Other areas are still very significant 1 hour rates:

So, as you can see, we are dealing with a VERY potent system. Models have been depicting over and over again for about .5-.75" inches water over the area, so that would translate to a good snowfall of 6-10" With that, I am raising my expected accumulations to 6-10" as a base. I am also going to say, if you get stuck under a band, you will be looking at 8-12" of snow. I even think there could be some areas along coastal sections of NJ (Monmouth Ocean Counties) that could go over 12" of snow. With winds gusting as well in the 20mph range, blowing snow will be a concern. I also think there will be locations reporting thundersnow tomorrow evening into the night as the low pressure really bombs out in the Atlantic. 

I will also preface this by saying, when we have strong lifting creating bands of snow, there will be other areas that will have very light precipitation. So, I think there will be a sharp cutoff to areas in NW NJ and NE PA. I truly believe this will be a I-95 special from DC to Boston. 

As always, updates will be coming on facebook and twitter. I will post a blog posting after the nightime model runs as well. 

January 2-3, 2014 Storm Final Thoughts (Thursday AM)

Final thoughts are in. I am actually quite excited for this storm to get underway in the area. It has the "look" and "feel" out there of a big storm if there is such a thing. Temperatures have already started falling as I am currently sitting at 31 after a mornin temp of 34 during my drive into work this morning. 

Interaction between the polar and subtropical jets have started, now we just need to wait until the precipitation fills in. Areas up north in PA, NY, CT and MA already have snow falling. This is associated with the polar jet plunging south. 

Light snow showers will overspread the area this afternoon. Snow showers will be sparse at first but will fill in and intensify towards evening. Late evening and overnight snow will really pick up. Winds will also start cranking in response to a rapidly developing low pressure along the easy coast. Temperatures will also plummet to single digits in the north and the teens throughout the rest of the state and even to the coast!

Winds will be whipping the snow around and substantial drifting will occur. In addition, with cold temperatures (highs tomorrow in the low teens) salt will not have the same effect on the roads. It will be a lot harder to have the melting power  in the colder temps. 

Generally, I am looking for 2-4" across extreme SNJ, N DE and NE MD. 4-8" across much of CNJ including the Philly to Trenton area. I also like 6-10" across NNJ into the NYC area. Areas in CT 8-12"

The real wildcard here will be where some of the intense snow bands set up. Weather models have been showing them along the NJ coast (Ocean and Monmouth Counties) and over Long Island. They can set up anywhere, and getting stuck under them can raise snow amounts 2-4"

In any case, be safe and stay alert for warnings. I will be updating throughout the day! 

January 2-3, 2014 Storm (Wednesday Noon Update)

First, HAPPY NEW YEAR!

Well, here we are once again with a very challenging forecast which will more than likely go down to another nowcasting event. There are a number of moving parts to this storm, and the overall strength will not be known for some time. We have an interaction that will occur between the subtropical jet (currently the precipitation along the Gulf States and the Polar jet (currently the precipitation through the midwest into Detroit). As seen here:

As the storm progresses, we will see an interaction occur. When, and how quickly these parts interact and eventually phase, that will determine how much snow we are looking at. The NAM model paints an earlier phase and a bigger storm for our area, and the GFS model paints a later phase, and as a result, a bigger storm over New England. In any case, the GFS model still paints a plowable event for our area.

GFS model- Showing a quick intesification for our area, but moves out rather quickly in the next frame and hits NE.

1am Friday:

 Friday 7am: (notice brunt of the precip off shore and over eastern NE

NAM MODEL

Quicker phase, really hammers our area

 Still has moderate to heavy snow over our area at 7am Friday (notice our area has the brunt of the precip):

So, the big question will be when does this phase occur. And unfortunately, it will have to be now casted tomorrow night. Either case, we are looking at a storm which will drop a couple inches. Here is where I am now, if we get that earlier phase, I think our area would be looking at 6-10" of snow. If we get that later phase, I think we will be looking at 2-4 (SNJ) to 3-6 (CNJ-NNJ). Its going to be another thread the needle event, with another tough forecast. Don't be surprised to hear amounts going up and down by the media stations. I do believe that Watches and or Warnings will be issued for MT Holly's forecast area this afternoon. In addition, Areas just to our north, we may actually have the B word watches issued. Winds will definitely be a factor, and if they can get high enough, we may meet that criteria ("Blizzard conditions" technically occur when strong winds (at least 35 mph) combine with either falling snow or snow on the ground to reduce visibilities to 1/4 mile or less for at least three hours.)

The other dangerous part of this storm will be the temperatures. We are dealing with a polar airmass with this, so even though the morning tomorrow will be cool, temperatures will plummet tomorrow night and it could infact get down to the teens and be snowing, 20's all the way down to the coast. The danger with that, is #1, its cold and #2, salt does not work as well in much colder temperatures. #3, snow ratios will be higher (usually 1" water = 10" of snow). We could be looking at 15:1, 20:1 or higher! In any case, I am tuned and am looking forward to seeing this come together!

January 2-3, 2014 Storm Potential

Well, here we are. Back to tracking exciting snowstorms! This one actually has me pretty excited. Not only at the potential snow impact, but for the fact that following the storm, we are looking at the coldest temperatures in the area since 1994. I am trying to think back that far, and think I can remember that. If my memory serves correct, we had an snow to rain event that was followed by a very powerful cold front that dropped many areas to near zero and highs were only in the single digits to teens. I can remember it well because we had about 8-10" of snow, followed by a period of heavy rain and then everything froze. We were able to ride our bikes across the top of the snow. We had a blast for a week (we were out of school for the week because of the temperatures). These are temps expected (from the EURO model) for Saturday Night (during the Eagles game)

So, its going to get cold after some snow....but how much? Well, thats the question. We have a pretty dynamic storm setting up, with a lot of moving pieces. While the models have been hinting at the potential storm for some time, we are now getting closer to a point where the models are able to ingest much better data. For our storms, data is best taken when the pieces of the storm come closer to the United States. Obviously, that is where we have all of our sensors, observers, weather balloons, etc. We are getting to that period tonight and tomorrow morning.

You may hear the terms Miller A and Miller B storms over the course of the week. This will be the type of storm we will be dealing with. Either, the storm will be coming out of the Gulf of Mexico and up the coast (Miller A) or will be diving into Ohio and then redeveloping along the East Coast (Miller B). Its unclear at this time which type we will be dealing with, but both can have significant impacts for our area. Miller A storms tend to affect a larger area ( entire east coast) while the Miller B storms will only impact those areas where redevelopment takes place and north. Both are capable of delivering a very big punch. Obviously, track, type, timing, etc will all play crucial factors to the final outcome. For now, I am expecting a plowable snow event (greater than 3") for the area. This will be for the period Thursday thru Friday. As models continue to evolve to a solution, I will continually update. The GFS and Euro models have both shown significant storms this afternoon. However, I am going to wait to see if they can get some consistency over the next few model runs. Until then, we are looking at a potential storm. Potential or not, this one has me pretty excited! Buckle Up!

Weekend Storm 12/14-12/15 (Update FRIDAY PM)

So, I have stressed over the past two days about tight gradients. Today, models continued to show that in our area, 40 miles can really make the difference between no accumulations and quite possibly 6-10". We could really see something like Southern Bucks Co, PA with 2" while Northern Bucks County is getting 8" I cannot stress enough how close this will be. There will be some things that will be nowcasted tomorrow that could change things as well. I will be updating frequently throughout the day on facebook and twitter.

Some of the things I will be looking at tomorrow:

1. Miller B type storms (which this is) usually leads to some type of "dry slot". This is an area where there is a break in precipitation. When and where this happens will obviously have an effect.

2. Placement of high pressure in Canada (directly north of us). If it is closer to the Canada/US border, we could see the cold air hold on longer. If it migrates up to Quebec or farther north, we may have an earlier transition to sleet

3. Any banding that develops that can enhance snowfall totals. 

4. Where the primary low pressure dies and where the new one takes over. Either of these things can also effect our area

In any case, on to amounts. 

coastal areas of NJ, I am expecting an almost all rain event. Possibly some snow to start, but quickly to rain

inland from there, SNJ East of the NJ TP up to 195 I expect 1-3" then rain

PHL - Trenton - West of the NJTP 1-3" before turning over to a bit of sleet and then rain

just to the NW of PHL - Trenton- New Brunswick - Newark, NJ 3-6" mix then rain late

Areas of the Lehigh Valley, C PA , NW NJ, Lower Hudson Valley through S CT 6-10"

Central and Northern CT through MASS up through VT, NH and Maine generally 10-14"

These are my thoughts at this time. Tomorrow will be a nowcasting day and any changes can lead to significant changes. 

Weekend Storm 12/14-12/15 (Update Thurs PM)

Well, the nighttime model runs are in and......... they paint a MUCH colder scenario. While this scenario is nice to see, it is really a thread the needle type of situation. There is a MASSIVE gradient over about  40 miles from nothing along the coast to 8" along the Delaware River. And while I am in no way calling for that much snow anywhere near this area, it cannot be discounted. A shift in any amount one way or the other can lead to drastically different outcomes.

So, for now, lets take it with a grain of salt. For now, know that this storm will start out as snow Saturday morning. We will more than likely receive an accumulating snow. I still believe that we transition to a mix and then rain, the question will be when. I am not jumping on the snow train yet after one model run, but it will be something to look forward to during the day tomorrow and tomorrow night.

I will be following tomorrow and will have my final thoughts on this tomorrow night.

Clipper Tonight, Bigger Storm End Of The Week

This week may well be remembered as one of the coldest over the past two years. This week will also be marked by bookend snow potential. A mild weekend has led way to crashing temperatures, snow chances and the lake effect snow machine cranking.

For our area, we are looking at a clipper moving through this evening. This will reinforce cold air, and bring us a chance at a period of snowy weather. This is not by any means, going to be a big event. In fact, this is going to resemble more along the lines of tracking a line of storms in the summer time. For those that see the squall move in, a quick burst of snow will cover the ground and could impair driving. A general coating to 1" can be expected.  Expect this to last less than an hour. The hi res NAM simulated radar has this over the area around 8pm tonight:

The real event for this storm tonight will be for areas in eastern New England (Boston to Portland, ME). They are going to experience what is known as a Norlun trough which will enhance the snowfall and really up totals in that area where 6" plus can be expected. I posted this a couple years ago when we had a Norlun trough move through our area, but here is the refresher for those interested:

                                                 Norlun Trough Explained (click link)

After this clipper moves through, our attention will turn towards Friday. Another storm is poised to move in and bring us a chance at some measurable snow fall. Weather models have been all over the place with this one, but the vast majority do show a storm. The next couple of days will be spent monitoring the weather models and trying to narrow down a consensus. We are looking at a Miller B storm, and historically, these are one of the most tricky storms to forecast. They can also lead to some of the most intense storms (a la our thunder snow storms for two winters ago.) For now, know that a chance exists and we will see how this plays out this week. Bundle up, going to be a cold one and hopefully snowy!