Upcoming Pattern Storm for Colorado

FutureHurricanes?

Hurricane Delta


Back on February 21st, the storm that is approaching Colorado for this coming Monday, was predicted by FutureSnow. It is part of the 46.5 day cycle length of this years repeating pattern. Monday’s storm has hit, on time, in every cycle with cycle 2 being the precipitation winner to date with 10” each at Vail and Keystone.
The 5th cycle began on April 8th. Below is the GFS snapshot of the 500 hPa charts for each cycle. You can see plenty of similarities and differences due to the different teleconnections. There are several things to compare and contrast but I’ll mention a couple. First the remnants of hurricane Delta are in cycle 1–the red dot near Washington DC. I mention this because one aspect of the repeating pattern is useful in predicting future hurricanes. You won’t know in which cycle they will come, but whatever hurricanes that occur during the new cycling pattern, their path will reoccur in the same date of the cycle, with similar locations the following hurricane season. So in this instance, hurricane Delta hit the Gulf of Mexico around Texas and Louisiana—so it will hit that same region this hurricane season during the same day of the cycle (day 4 cycle 1), so look for a possible hurricane hitting the Gulf June 3rd, July 20th, or Sept 4t: probability 75% +/- 5 days. Second, you can also see how the polar vortex, in cycle 4, effected the pattern. Look at the location of the polar vortex and how that changed the look of the chart. The PV is an teleconnection so this is a clear example of how just one connection can change the outcome.

Cycle 1
Cycle 2
Cycle 3
Cycle 4
Cycle 5 (4/12)

The next pattern storms will arrive towards the end of April. I will give you an update when we get a little closer. Thanks for spending time reading the FutureSnow/FutureHurricane blog, as always if you have any questions please ask in the comments section or send an email to Mike@FutureSnow.co.

Impossible Possible

Beaver Creek Colorado

I have known for a handful of years now that the weather repeats. I learned the theory from local Kansas City meteorologist Gary Lezak and expanded my understanding later with meteorologist Doug Heady about the cycling pattern. Then a natural progression occurred with first finding patterns in snowfall and later learning to read weather charts to make accurate forecasts. Last year I made a leap and started to get organized thanks to the prodding of Joel Gratz Founder and forecaster of OpenSnow, I put together a list of snow predictions and filled my photo stream with GFS snapshots, snow reports etc. I would shoot Joel emails pestering him with a snowstorm that I predicted and then when the storm would hit I would email him back “do you believe yet”. The answer was usually “not really” or something like “I kind of see what your looking at” but still skeptical. Larry Schick, OpenSnow Northwest and British Columbia forecaster had a great line “weather has no memory”. This guy worked for 20 years in Seattle TV as a meteorologist and now works for the US Army Corps of Engineers.

Below is the greatest long-range forecast ever predicted. Ok, I know it belabors the point to continually brag about forecasts, but it is not intended to be pompous, rather it is about this incredible force that is in the beginning stages of being understood.

Decoding the Chart

So about the chart: this was what I put together, Cycle 3 chart of predictions for January 25th through March 21. Last year was an 58 and a half day cycle. I ran out of room so I put day 58 at the top left. Yellow meant that I thought there would be a storm from the pattern based on previous cycles, Pink meant probable storms–official predictions. To me, the short hand was obvious, Squaw, Park, Heav, Banff–obvious mountains. Cry=Crystal, MH=Mt. Hood, JH=Jackson Hole, WB=Whistler, LL=Lake Louise, Kicking Horse (Canada–great place no crowds), BS=Big Sky, Alta and Vail. During the cycle I would record snowfall with the corresponding predictions. Below is the completed chart. The Date in in the box and the right upper corner the day of the cycle.

So looking at the chart on Day 3 was January 27th and in the yellow the predicted areas were Park City, Heavenly, then on day 4 Crystal, Mt. Hood, Jackson Hole, Whistler and Heavenly. So what I thought at the time was the system coming in would begin in the PNW, divide into a northern and southern track. the Southern track hitting California’s Heavenly sliding across hitting Park City with the northern track hitting Big Sky and Jackson hole. It was almost perfect, except that, as it turns out, Heavenly and the Tahoe region were not “in” the path of the pattern last year. I would later figure that out and take them off the grid–later though the cycle grew in strength (cycle path footprint expanded) and Tahoe would get a months worth of snow in a week right when the lockdown hit.

These area a few tools in my toolbox now. My photo folders are littered with screen shots of weather charts. It takes hours to pour through the charts figuring out the pattern, but it has its rewards of catching deep powder on occasion and always catching fresh snow on any ski/snowboard trip. I just got back from a trip to the PNW and also a Colorado trip. For Colorado, I booked this trip to take my son before his High School baseball begins–after which he will be busy until fall. We rode fresh snow at Beaver Creek and were lucky to get a mid-week rope drop off Birds of Prey lift, and our luck continued at Breckenridge getting to ride the Imperial Express lift, just opened for the first time of the season, after 3 failed attempts off the T-Bar–don’t worry buddy, it is really hard for snowboarders, you’ll get it next time! Then it was on to Crystal for the real powder chase.

Birds of Prey Express Lift
Steep and Deep at Crystal Mountain Washington

As always feel free to email me or ask a question in the comments box. I’m happy to answer! Finally, below is a chart of upcoming Pattern Storms predicted out until May. Probably won’t go out any farther than that, but Powder Days late in the season can happen. I rode a storm at Arapahoe Basin in late April a few years back that was on my top ten list of all-time trip lists–18″ of cold blower pow. I got white-out vertigo sitting on the Cornice Jump run. White-out vertigo is a really cool experience if it has never happened to you, the only thing you can see is white. You can’t get any perspective at all and you get dizzy. Luckily for me someone came and jumped off the cornice so I quickly followed close enough until I got down to tree line.

Prediction Grid Currently 85% Accurate

March and April Predictions

March and April Predictions

It has been an amazing year so far, FutureSnow has accurately predicted 23 out of 27 events, that’s 85%. That is really an amazing statistic because all of the predictions have been made at least 25 days in advance before any models are in range. The longest was 56 days for Colorado where Vail had 13 inches. There is an even longer prediction coming up, 67 days, for March 9-11th. I would love to end the ski season with 90%. This is not meant as a brag, I just simply interpret the data, it more of how cool it is to know when these systems will come through.

Cycle 4

The 4th cycle is under way. At the beginning of each cycle the storms favor the Pacific Northwest and Canada. This has occurred in each of the previous three cycles and GFS verifies same for the beginning of this cycle. The cycle is 45 1/2 to 45.8 days in length. I have adjusted the upcoming predictions by a couple of days to correct this offset.

When talking about the cycle, every year is different. Last year had a longer cycle, La Nina favors shorter cycles. Presently this La Niña is weakening, the Arctic Oscillation is neutral, the north Atlantic Oscillation is neutral, and the Madden Julian Oscillation is in phase 7 in the western pacific. All of these tele-connections influence the strength and path of storms. However, the framework, or structure of the storm path, remains the same throughout the spring and it weakens in the summer until it is wiped out in late summer.


February 27th Colorado Prediction

This forecasted storm was made on January 26th as I dove back into the history of the previous cycles. I missed this “pattern storm” and discovered it through a little forensic analysis.

History of the storm

Day 6 of last cycle, a small wave hit Colorado, followed by a large wave impacting the PNW. In cycle 2, again a small wave hit Colorado followed by a small wave hitting the PNW. In cycle 1 on day 7 a small wave hit CO followed by a large wave in the PNW. So when I decided to add this to the prediction grid I decided to add it on day 7, probably not a smart choice because it hit on day 6 twice but my thinking was it hit late on 6 both times and the day 7 storm it was during the day.
The GFS has this storm arriving at about 6 am on Thursday the 25th. This is actually right on time—if I would have been “on it” and adjusted the cycle length to reflect the uneven cycle (45 1/2-45.8 days).

FutureSnow CO Prediction

I have adjusted all future predictions by 2 days to correct the cycle to match the storm cycles. I am not going to update the existing storm forecast for February but the March schedule has been adjusted. Below us the updated predictions spreadsheet.

This Weeks Picture Challenge

Post your response in the comments section.

Big Hit!

Well we got a big hit! We were thinking that the cycle will strengthen due to a weakening La Niña and it has come through strong. We had 2 predictions. Utah’s Alta, and all CO mountains. Alta 15” today with more on the way, second, we forecasted for all Colorado mountains.

Steamboat 20”

Vail 13”

Breck 8”

Beaver Creek 7”

Vail snowstake

The last time through on December 23, we had a huge ridge off the West Coast that did produce both in Utah and Colorado. This time through we have a more linear pattern with no rigging. This allowed more energy from the stronger jet that propagated down through the PNW. This pattern should continue in the next cycle. These next couple of pictures show the difference between where are the ridges in place, and the flow.

Last Cycle


Current Cycle

OK so let’s take a look at the next predictions.

February 18-22nd. Active week in the PNW Crystal Mountain

February 24-25 Alyeska Alaska

February 25th PNW Crystal Mountain

February 27th Colorado Mountains

Thanks for all your email questions and if you have any others send them to mike@futuresnow.cc. I usually get to them within a day.