While a significant pattern change into chilly conditions will occur by the end of September and beginning of the new month of October, the most recent trend now finds a majority of the European Ensemble members warming temperatures back to above average by race weekend.
Although I highlight the operational European Model, the mean of the 51-Member Ensemble Group continues to show a shift to unseasonably cool conditions that will impact the 11th Annual High Knob Naturalist Rally.
This will create chilly conditions for the rally, as well as for any racers who may be in the region to practice.
Eagle Knob of High Knob Massif Elevation 4188 feet
Average Daily MAX: 62.1 degrees Average Daily MIN: 51.4 degrees September 1-23 MEAN: 56.8 degrees Highest Temperature: 73 degrees Lowest Temperature: 41 degrees Total Precipitation: 3.50″ to 4.00″
Conditions observed during September 1-23
High Knob Lake Elevation 3527 feet
Average Daily MAX: 64.8 degrees Average Daily MIN: 50.4 degrees September 1-23 MEAN: 57.6 degrees Highest Temperature: 76 degrees *Lowest Temperature: 41 degrees
*Middle 30s occurred in the colder valleys, with average nightly lows for the September 1-23 period being in middle-upper 40s.
The new development is beyond this time, with a shift back toward eastern-central USA ridging and troughing over the Pacific Northwest leading up to the weekend of the races.
The operational European Model ( above ) has support of all but approximately 14 members of the 51-member ensemble group ( mean of the group below ).
If this new trend is accurate, it would lead to above average temperatures returning in time for race weekend ( Oct 7-8 ). Positioning of height centers, above, would also suggest a continuation of mainly dry conditions.
Stay tuned for updates as race weekend gets closer in time and details become more clear. The first detailed forecast for these races will be made by the middle of next week.