Meteorologists who have spent the past few days monitoring the rapid development of Hurricane Melissa in the Atlantic Ocean are sounding the alarm about the storm, which is set to make landfall in Jamaica today as a Category 5 hurricane. The sustained—and growing—intensity of the storm is remarkable, experts say, and has the makings of a historic hurricane. Early Tuesday morning, as it approached Jamaica, Melissa was measuring a minimum pressure of 901 millibars (mb)—lower than Hurricane Katrina’s peak low pressure of 902 mb and the lowest pressure ever recorded in a hurricane this late in the year, according to Colorado State University meteorologist Philip Klotzbach. If it makes landfall at this pressure, it would be tied with the catastrophic 1935 Labor Day hurricane, which hit Florida, as the most intense hurricane by pressure to make landfall. “You usually see rapid intensification happen when it’s a tropical storm or a Category 1, 2 hurricane.