The eye lasted about fifty-five minutes at Long Key and about forty minutes at Lower Matecumbe. The storm's forward speed was only about 10 mph, but its comparatively small eye was wrapped with superdestructive winds. These winds were of unbelievable force, higher than survivors could begin to describe. Some estimates suggest that winds could have approached 250 mph. Unquestionably, this hurricane's winds were far greater than those in any other hurricane in Weather Bureau history.
Eyewitness reports and the observations of relief crews provided evidence to support the estimates.
Equally remarkable but more accurately recorded, this hurricane's intensity was indicated by extremely low measurements in barometric pressure. Aneroid barometers throughout the Keys recorded astonishing readings below 27.00 inches, which at first brought skepticism from seasoned weather observers in other parts of the country. Because of the hurricane's small diameter and extreme low pressure, it was estimated that while it was over the Keys, there was a pressure difference of one inch in only six miles. Those who lived near the shore along the Keys considered themselves experienced with hurricanes. As hurricanes approached, families gathered their most important belongings, their pets, and a couple of days' rations and left their homes for the safety of these shelters.