...BOSTON (S&P Global Ratings) March 5, 2019--S&P Global Ratings revised the outlook on its 'A+' underlying rating (SPUR) on Hamburg Central School District , N.Y.'s general obligation (GO) debt to positive from stable and affirmed the rating. At the same time, S&P Global Ratings assigned its 'A+' long-term rating and positive outlook to the district's series 2019 GO school district serial bonds. The outlook revision reflects S&P Global Ratings' opinion of the district posting surpluses during five of the past six fiscal years while projecting another surplus in fiscal 2019, leading to general fund reserves growing to levels the rating service considers strong. "We believe there is a one-in-three chance we could raise the rating during the two-year outlook period. All else remaining equal, we could raise the rating if strong budgetary performance were to continue, leading reserves to improve to levels we consider comparable with higher-rated peers while committing to maintaining them at higher...