OTTAWA—The Canadian economy most likely underperformed expectations in the third quarter amid ongoing supply chain woes and a brutal drought, official data suggested on Friday, prompting analysts to forecast the Bank of Canada could move slower on rate hikes. The economy expanded by 0.4 percent in August, missing estimates, and looked set to show no growth in September, when supply chain issues crimped auto exports and retail sales declined, Statistics Canada said. The agriculture sector, hit hard by hot and dry conditions, is also weighing on economic activity. Third quarter annualized GDP rose by just 1.9 percent, Statscan said in a flash estimate, much less than the 5.5 percent forecast by the Bank of Canada on Wednesday, when it signaled a rate hike could come as soon as April 2022. Even though the central bank and Statistics Canada use slightly different ways of measuring GDP, analysts said the third quarter …