Greenland Blocking Pattern Develops; Surf UpdateSeptember 15th, 2012 at 9:15 am by Jeff Edmondson WAVY under Weather
More and more in the longer range computer models I am starting to see a Greenland Blocking Pattern develop. What a blocking pattern is when you get a large area of high pressure, or low pressure to disturb the normal west to east flow of the jetstream.
This pattern will allow cooler air to sneak down from the North. Since its still September, the deep cold pool hasn’t developed yet so in the meantime we’ll just see temperatures below average. Today it looks like we will see highs in the upper 70s. We may see more of these blocking patterns develop over the next few weeks and months. This could mean temperatures below normal for Autumn.
With this north wind at 10-20mph today it will keep the layers of the atmosphere dry and we shouldn’t have any rain across Hampton Roads. With these cold fronts pushing through our area it’s keep the tropical risk low as Nadine continues moving to the east in the Atlantic as a Category 1 hurricane.
A small swell is coming this weekend, likely arriving Sunday morning with wave heights expected to be 2-4ft. Chest high waves with winds that aren’t too strong is expected to be the pattern this weekend. Remember, higher waves also means a higher threat for rip current development. Today the risk is moderate and it will likely be the case tomorrow, so be careful if your going into the water.
Enjoy your weekend!
Meteorologist Jeff Edmondson