Predicting Snow Drift 6711
Snow begins to drift when wind speeds exceed a threshold velocity of 5 meters per second. Of course, the quality of the snow already on the ground has much to do with this too, and its physical composition changes with the drifting process. The mechanisms involved can be difficult to predict. Extensive research and complex equations have been created in efforts to make those predictions.
Likewise, the reasons for which the majestic snowy owl seem to drift southward in unpredictable irruptions every few years are just as uncertain. The reproduction and survival of these exalted raptors of the north seem to be intimately tied to those of a rodent, the lemming. So population growth of the birds and the lemmings are at least part of the reason that some of these birds have traveled as far south as Bermuda. Each year, it seems, at least a few birds manage to make it to our region. I hope we will have ample opportunity to see them again this year. #SnowyOwl
Predicting Snow Drift 6711
Snow begins to drift when wind speeds exceed a threshold velocity of 5 meters per second. Of course, the quality of the snow already on the ground has much to do with this too, and its physical composition changes with the drifting process. The mechanisms involved can be difficult to predict. Extensive research and complex equations have been created in efforts to make those predictions.
Likewise, the reasons for which the majestic snowy owl seem to drift southward in unpredictable irruptions every few years are just as uncertain. The reproduction and survival of these exalted raptors of the north seem to be intimately tied to those of a rodent, the lemming. So population growth of the birds and the lemmings are at least part of the reason that some of these birds have traveled as far south as Bermuda. Each year, it seems, at least a few birds manage to make it to our region. I hope we will have ample opportunity to see them again this year. #SnowyOwl