Compare the change between late-April/early-May to mid-May of each year. The cooler, upwelled water next to the coast in early May is covered by a warmer layer between May 2 and May 16, 1997. Warming extends into the Alaska Gyre. Upwelling resumes in June-July, producing normal cool upwelling features (inshore of warmer water in 1997), as seen in July-August. Another pulse of warm water covers these features in September, 1997. After another brief period of upwelling in October, warm water returns next to the coast in November. In December, the normal pattern (1996) is to see cooler water next to the coast as the whole system cools seasonally. In 1997, the pattern is reversed, with warmer water next to the coast.
 Feb 13, 1996:  Feb 7, 1998:
 Mar 26, 1996:  Mar 21, 1998:
 Apr 23, 1996:  Apr 24, 1998:
 May 14, 1996:  May 16, 1998:
 June 4, 1996:  June 13, 1998:
 July 2, 1996:  July 18, 1998:
July 30, 1996:  Aug 1, 1998:
 Aug 13, 1996:  Aug 8, 1998:
 Sept 24, 1996:  Sept 19, 1998:
 Oct 8, 1996:  Oct 10, 1998:

 Oct 29, 1996:

 Oct 24, 1998:
 Nov 26, 1996:  Nov 21, 1998: