This episode's headline: Spring Siege; Crime Drop; Politics & Justice; Conversation - Across Boundaries. ANCHOR: JIM LEHRER; GUESTS: EDWARD SCHAEFER, Governor, North Dakota; SEN. BYRON DORGAN, [D] North Dakota; FRANK RICHARDS, National Weather Service; CHERYL PARKS, American Red Cross; MICHAEL ARMSTRONG, FEMA; DAVID MAKOVSKY, Ha'aretz, Israel; MAMPHELA RAMPHELE, University of Capetown; CORRESPONDENTS: FRED DE SAM LAZARO; BETTY ANN BOWSER; MARGARET WARNER; CHARLAYNE HUNTER- GAULT;