sentences:  Late on August 4, Guillermo intensified into a Category 5 hurricane, attaining peak winds of 160 mph (260 km/h).Operational analysis of satellite information indicated a minimum pressure of 921 mbar (hPa; 27.2 inHg); however, post-storm studies stated that the pressure was more likely around 919 mbar (hPa; 27.14 inHg).At its peak, cloud temperatures within the eyewall were estimated to be as low as .