Early on August 27, the JTWC upgraded the system to a typhoon, and an eye began to appear around 23:00 UTC that day.[3] Omar entered a phase of rapid intensification on August 28,[2] at which point the JMA also classified it as a typhoon.[4] The typhoon made landfall on Guam soon after, with 1‑minute sustained winds of about 195 km/h (120 mph).[2] The eye, 37 km (23 mi) in diameter,[2] slowly crossed the northern portion of the small island over a period of 2.5 hours.[5]