|Graphs show wind velocity from the 2006 Marblehead NOOD. The colored lines represent windspeed over time; the yellow arrows represent wind direction over time|
During last year's Marblehead NOOD we saw a weak, stalled frontal boundary that held a light southwesterly flow across the region for Friday and Saturday. This weak front drifted over the region late on Saturday (with a thunderstorm) and was offshore through Sunday. The graphs below show winds from last year's NOOD. This sensor is a Sailflow exclusive station installed on Children's Island (Cat Island), which is just north of the inner race circle. Study this graph closely, because you can clearly see that on both Friday and Saturday the sea breezes were able to isolate the southwesterly flow to the offshore course. Inside, the winds remained weak and very shifty with occasional right shifts to the south and south-southeast. When the sun got low on the horizon, the sea breeze weakened and the southwesterly flow was able to fill back into the inner course. Many computer models and forecasters might give a moderate southwesterly prediction for the entire area for this day, but as you can see from the graph, there is considerable variation. Reports from the off shore course were for solid southwesterly flow both days.