November 19, 2019
This is the third part of my Winter Storm Outlook Series for the 2019-2020 winter season. The is my last installment before my complete outlook and formal projection for seasonal snow totals. The focus here is on teleconnections around the globe including the prior tropical season in Eastern Asia and the Atlantic Basins. We should have a busy season with plenty of storms, but where they track will make the difference of snow, ice, or rain makers. Looking at the prior tropical season could give us a hint for what to expect.
One of the pioneers in long range forecasting was Dr. William Gray. In the 1970s he noticed the connection of low hurricane activity in the Atlantic when there was an El Nino event in the Pacific. He went on to find more connections around the globe, including rainfall in eastern Africa and the hurricane activity across the Atlantic a year later.
Atmospheric science treats weather patterns like a fluid, with jet streams as rivers air. If you were to drop a large rock into a pond, you can watch the ripples move across the water, and sometimes how they bounce back. If you drop a few rocks in the water, you can see how the ripples interact with each other. So, it is with that notion that meteorologists look for other connections around the globe in various seasons.
East Asia and US Connection
A strong storm in east Asia often is followed by a strong storm off the US coast (in the Gulf of Mexico or Atlantic) around 10 days later. Meteorologist Joe Bastardi was the first person I heard this from. It has proven itself many times over across many years and many seasons. I have seen this during tropical season as well as during the winter.
I been researching and tracking tropical cyclones over the past few years to see how they could hint at our winter storm tracks. My Atmospheric Memory Theory does suggest weather patterns can show up in short and long term storm tracks.
I have taken that a step farther to see if the plot of Typhoons off of east Asia in the summer and autumn can indicate how storms may track in our region, especially in the winter to follow. This is not to show exact future storm tracks, but rather the trend of the type of storms we could get.
Pacific Tropical Cyclone and Typhoons
Here is the plot of storms this past year in east Asia. In the past I have noticed that if the bulk of storms dominate along the southern path, this translates to global patterns getting locked up north and we end up warmer during the winter.
When the bulk of typhoons curve their tracks north, that results in an active jet stream around the globe. This can propagate for months. The tropical push north is eventually balanced by high amplitude waves and dominate cold surges south in the following winter. We have already seen some of this with record snow in the central US in October and on pace for a record cold November.
Japan Tracks and US East Coast Storms
When quite a few storms track through or east of Japan, the resulting pattern in our Hemisphere often translates to more coastal storms along the US…
West Of Japan And China Storm Tracks
There were plenty of those as well this year. These still influence the long wave global jet stream, but correspond to US storms that tend to track inland, up the Mississippi and Ohio Valleys.
Atlantic Basin Storms
My intent now is not correlate the time connection of the Pacific and Atlantic storms I mentioned above. The purpose here is just for the pattern of storm tracks. The tropical cyclone tracks seen here in the Atlanic (and Gulf) reflect a lot more systems curving north than the southern paths. The is just like the Eastern Asia season. North tracks influence the northern jet stream and those that track really far north, three systems that reaches far north into the United Kingdom that has left ripples in the northern jet stream that will continue to propagate out.
This is one of the reasons we have already seen very deep troughs that brought us record snow in the Mid west and record cold to the eastern half of the US over between October and the first half of November.
In relation to the US, and more specifically us in the Eastern US, this can be further identified as Gulf of Mexico storms tracking inland up the Mississippi and Ohio Valley, or to the East Coast. We can also look at coast systems that curved out into the Atlantic.
There were four storms of note that spent a brief time in the Gulf of Mexico and tracked into the US.
There were a wide variety of tracks starting with Barry. This was a unique Upper Low that starting inland and dropped south to the Gulf to turn tropical, then loop north. Imelda and Olga also were close to Louisiana, which leads me to see this area as a hot bed for development of storms this winter.
Nestor is the one I see as most important as it was this that gave us a soaking rain event and overachiever in October. It was that Sunday Oct 20 that followed a week after the ‘bomb storm’ in the Northeast.
Bomb Storm A Week Earlier
*If the global pattern operates on a 45 to 60 day cycle, then we could see repeating storms like these in the first half of December.
East Coast Storms
This record Category 5 Hurricane is the one that stalled over the Bahamas with 185 mph winds. This impacted the southeast US, but curved away form the Mid Atlantic. Many storms do that and a few are likely to follow suit this winter.
Tropical Storm Melissa
This was a Tropical Storm in October that you might not be familiar with, because it never hit land. It formed off of the North Carolina coast and moved essay. But it stalled and looped for a few days. I am highlighting this storm because it did have an impact on us.
October 12 Costal Fooding
The stalling of Melissa along wth strong High Pressure in eastern Canada resulted in a persistent onshore flow. This piled water along the coast and up the Chesapeake Bay. This was the storm that led to beach flooding and flooding in Annapolis during the boat show. Even when we don’t get the direct impact of a coastal storm, sometimes it can lead to flooding on our shorelines.
I do expect this winter will have a few repeats of flooding at the beach and on the ‘Bay
Likely Common Winter 2019-2020 Tracks
A high amplitude jet stream will make for powerful winter storms, but the likely tracks seen here will determine what type of weather we will get:
I expect and active winter translating into a lot of storms to count. Plenty of these will originate in the Gulf of Mexico and coastal Louisiana is a spot to watch. A few will team up again with moisture from the Pacific Ocean with plenty of moisture. I have good reason to believe that we will have at least one BIG winter storm for us (see the chart below). But not all will be the same, which usually is the case.
The storm tracks and weather for us are explained below.
Inland (Mississippi/Ohio Valley Tracks):
These are storms that will track up the Mississippi or Ohio River Valleys. These are snowmakers for the MidWest, but pump in warmer air for us in the Mid Atlantic. The Ohio Valley tracks are storms that can bring us some ice storms, or the snow/ice mix that turns to rain.
These also originate from the Gulf of Mexico, but will do one of two things when they reach North Carolina:
- Northeast Storms: These storms turn or redevelop off of the coast and will be the big snow makers for us. This is similar to the track Nestor by us on October 20th. The statistical pattern does support that we are due for at least one big storm (10”+ in the city) this winter, and it is likely to come from a storm along this path.
- Southern Storms Off The Coast: These are the storms that can bring southern Maryland and the beaches snow, while missing the cities and normally colder inland spots. I expect we should see 2 or 3 of these during the winter.
Southeast Coastal Storms
These may be the big teases of the season. I see this similar to the track of Hurricane Dorian and Melissa. Some storms that develop off the Florida to North Carolina coast and impact the southeast US. But as has been the trend, the forcing will shove them east of North Carolina and just out of our reach, but the high water will still lead to coastal and ‘Bay flooding.
We Are Due For At Least One Big Storm This Winter