and had grown large enough to determine the wind pattern off the United 

 States east coast. The position of the Ro Vo ATLANTIS is indicated by an 

 A, and that portion of the wind field which generated waves that affected 

 the R, Vo ATLANTIS is outlined by the rectangle. The wind at the ship was 

 nearly north while over the major part of the generating area it was north= 

 easterly. The area of northerlies spread northward with the movement of 

 the low. 



By October 21st (figs. 5,1b and 5.1c) the frontal wave was well to the 

 northeast leaving the. a(hip in a northwest flow with the fetch length limited to 

 the distance to the coast. A cold front oriented E= W is seen in eastern 1 



Canada (fig. 5.1b). This front moved southward passing the R. V. ATLANTIS 

 during the morning of the 22nd. A small low which developed on this front 

 is seen near the ship at 1230Z of the 22nd (fig, 5. Id). Later as this low 

 moved northeastward a band of winds from the west=northwest moved south- 

 ward to the ship. The flow was almost at right angles to the isobars and 

 would have been difficult to forecast. 



By 1230 Z of the following day, the frontal system of the twenty=first 

 had moved well to the east leaving the ship in a northwesterly flow for the 

 12 hours preceding the observation of 1200 Z. 



At 0030 Z of October 24th the flow was westerly in the area ahead of 



the cold front m.oving south from New England. As the front got closer and 



assumed a WNW=ESE orientation, the flow became west-northwesterly as 



seen in the chart for 1230Z (fig. 5,2a). The front passed the R, V. ATLANTIS 



36 



