Pressure measure ranks Irma in strongest storms
Hurricane Irma became tied for the seventh strongest storm to make landfall in U.S. history by a key measurement of atmospheric pressure. Hurricane Irma made landfall at Cudjoe Key at 9:10 a.m. with a minimum central pressure of 929 millibars. Atmospheric pressure is one of the major measurements meteorologists use to describe storms. The lower the pressure, the stronger the storm.