Good morning bloggers,
While today is a rather boring, but nice weather day, I decided to look at something from a year that was rather fascinating....The LRC in 1992-1993! There has been increasing discussion on my theory in recent days with a lot of questions and this very exciting weather year hopefully will be a great example of my theory. Before we get to this, here is a comment posted yesterday by blogger "supercell" with his way of describing the LRC:
Here's my layman's explanation of the LRC:
1) Think of waves. Ocean waves come in sets. Surfers have learned how to read the sets so they will know when to expect a good wave. Sometimes the sets vary, but once the pattern is recognized, an extremely accurate prediction of future sets can be made. There's no debate ocean waves come in sets. What we debate is why? Because we can see the waves and study their movement with our own eyes, we firmly accept the conclusion they come in patterns and not some random variation. The bigger question is Why? Much like the LRC.
2) Think of waves again. This time it's a human wave. Imagine Arrowhead Stadium with fans doing the wave (how long has that been?). Sometimes the fans are really into it and the wave can easily be seen making its way around the stadium. Sometimes the fans are not as energetic and the wave will be strong to start and fade in the middle. However, we still recognize the wave even if only a few people are doing it because we recognize the characteristics of the wave. With just a few characteristics of the wave in place, it's possible to accurately predict what will happen with the wave. Will it die out? Will it make it around? Why? Because it's a pattern we recognize. The strength of the wave makes it easier or harder to predict what will happen. Just like the LRC.
My point? Patterns are easy to recognize if you look for them. Not many things are random. In no way do I believe weather is random. There is a pattern. The prediction of what will happen next comes from observation and recognizing what you see. That's what Gary and his team are doing now. Observing and looking for characteristics so they will be able to accurately tell us what will happen over the next set. Will this year's LRC be a long set or short set? Will we have big waves or small waves? Will it be 35 days or 70 days between sets? Just like waves. Weather has a pattern and someone is working to figure it out.
To me, the bigger question isn't whether or not there's an LRC. My question is Why? If someone can figure out what causes the pattern, then long-term forecasting will take a quantum leap. If you know why, then a forecaster could predict a pattern BEFORE it forms. As it stands now, we wait for the pattern to form and then predict what it will do. Imagine taking the next step...
Thank you for your input, supercell. There is a lot to think about!
Now, let's take a look back at the 1992-1993 season. This was a particularly active and stormy pattern for our region. It was my first winter in Kansas City after moving north from Oklahoma in 1992. The "long term" longwave troughs and ridges set up placing us in a stormy weather pattern that began in October, picked up in November, and then went wild during the winter months. There were two one foot snowstorms in the KC metro area that winter. The winter was very active with many storm systems. The biggest ones did fall right in line with what must have been around a 47 to 50 day cycle that year. And, the pattern ended with the Flood of '93.
Here are some maps to compare and if you look at the dates you can pick up the likely cycle. The dates of the maps are listed here with the # of days between each cycle. Remember, each one of these dates is just a snapshot in time, and the overall pattern is cycling, not just one storm system:
- October 8, 1992
- November 25, 1992 (48 days later)
- January 13, 1993 (49 days)
- February 25, 1993
- March 3, 1993 (49 days)
- April 20, 1993 (48 days)
- June 8, 1993 (49 days)
- July 25, 1993 (47 days)

The 1992 October showed this developing pattern, but could we have known it was going to be this stormy? The first major winter storm of the season in our region developed around November 25th. I remember this day well as we were forecasting the biggest November snowstorm in Kansas City history, but it dumped on Dodge City Kansas and redeveloped as it ejected over us leaving around 1 to 5 inches of snow in our viewing area.

This next map, below, is from January 13th, 49 days later. This is the one that produced up to 14 inches of snow across the KC metro area.

This next map, below, shows the 500 mb flow as we were being blasted by a 10 to 14 inch snowstorm in Kansas City. At first I thought this was right on the cycle for this year, but it was 5 days off. But, look at what happened 5 days later on the next map. There is the storm that is related to the others in the sequence.


And, now we move into spring and here is the next storm in this part of the pattern and right on schedule. April 20th is 48 days after the March version version of this storm system.

As we move out of May and into the summer months the jet stream retreats significantly and the same pattern gets a bit more masqued. Here are the June and July versions of the cycling LRC in 1992-1993:


It was a very wet winter across the plains states setting the stage for one of the worst floods in USA history. The "Flood of '93" materialized as we moved through the spring into early summer. MCS (Mesoscale Convective System) activity developed day after day across Nebraska/Iowa, Kansas, and Missouri with this summer version of what we believe was the same pattern from the previous winter cycling over and over again. The flooding rains abruptly ended after the middle of July and this was when I first believed the old pattern falls apart in late July and August. Something very different began developing at this point.
What do you think of this example? It was a weather pattern to remember and we haven't had as exciting of a weather pattern since 1992-1993 in Kansas City. I believe this is a great example of the LRC. Do you think it was just a coincidence? Two nearly 1 foot snowstorms, not to mention all of the others, were a result of the cycle and the "long term" longwaves according to my theory. If you have any questions let's begin another debate today.
So, where are these features this year? We are still identifying the features and there are still so many uncertainties. By December most of these features become better defined. Our winter forecast will come out November 16th and we will have a special segment on NBC Action News that night. Hopefully most of the pieces of the LRC puzzle will come together before mid-November.
Have a great day! I am on Sports Radio 810 WHB, at 8 AM. Then it is off to work out, and go in to track this very warm air heading our way.
Gary