 However, a large convective banding feature developed to the north of the system.Several hours later, hurricane hunters flew through the storm and recorded surface winds of 40 mph (65 km/h) and a barometric pressure of 999 mbar (hPa; 29.5 inHg), leading to the upgrade of the depression to a tropical storm.At this time, the storm received the name "Katrina" and peaked in intensity.