Input (grade 13): After fluctuating in intensity for four days, Isabel gradually weakened and made landfall on the Outer Banks of North Carolina with winds of 105 mph (165 km\/h) on September 18.
Output (grade 8): After weakening and strengthening for four days, Isabel slowly weakened. It moved onto the Outer Banks of North Carolina with winds of 105 mph (165 km\/h) on September 18.