When the weather turns warm, entertainment is supposed to turn frothy and frivolous. In movie theaters, the summer brings teen comedies and top guns; at the beach, Robert Ludlum mysteries and Barbara Cartland romances. Yet TV, oddly, has taken a different tack of late. Summer series today are more likely to be of the serious sort, shows that would have little chance of surviving the ratings battle any other time of year. Thus two prime-time newsmagazines -- CBS's West 57th and NBC's 1986 -- have joined the networks' hot-weather schedules; both will presumably be back in storage by the fall.
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