Reports from a NOAA Hurricane Hunter aircraft indicate that the maximum sustained winds have increased to near 140 mph (220 km/h) with higher gusts. Delta is a category 4 hurricane on the Saffir-Simpson Hurricane Wind Scale. Some additional strengthening is possible during the next 24 hours, and Delta is forecast to be an extremely dangerous category 4 hurricane when it reaches the Yucatan peninsula Wednesday. Although some weakening is likely when Delta moves over the Yucatan peninsula, re-strengthening is forecast when the hurricane moves over the southern Gulf of Mexico.
Hurricane-force winds extend outward up to 25 miles (35 km) from the center and tropical-storm-force winds extend outward up to 90 miles (150 km).
The estimated minimum central pressure from NOAA reconnaissance aircraft data is 956 mb (28.23 inches).