Hurricane Grace Research Paper

Hurricane Grace was a category 2 hurricane that was short lived in 1991. It emerged from a cold front that left the East coast of the United States. On October 28th a extratropical cyclone progressed along a cold front to the East of Nova Scotia. On Oct 27th, Hurricane Grace developed from a pre existing subtropical storm and was originally moving northeastward, had made a turn and headed east. Hurricane Grace was drifted upwards by its cold front into a warm zone of circulation of the deep cyclone on Oct 29th. The cyclone strikingly got stronger as a result of a temperature contrast between the cold air to the northwest and the warmth and humidity from the remains of hurricane Grace. As the low pressure system proceeded to get deeper, hurricane Grace changed to a secondary contributor to the extraordinary sea conditions. It had a strange reverse motion for a nor’easter. The centre of the extratropical low strayed southeastward and then south westward,

A Nor’easter gets its name from the northwesterly winds that blow in from the ocean. A Nor'easter develops in response to a sharp contrast in temperature between the warm Gulf stream and the cold air from Canada. When the very cold and dry air rushes down and meets the warm Gulf stream, intense low pressure develops. In the upper atmosphere, the strong winds of the jet stream, remove and replace rising air from the Atlantic more quickly than the Atlantic air is replaced at lower level. This activity and the Coriolis force helps develop a strong storm. Clockwise winds around the low pressure system blow the moist air over land. The relatively warm moist air meets the cold air coming down from Canada. The low increases the surrounding pressure differences which causes very different air masses to collide at faster speed. When the difference in temperature of air masses is large, so is the storms instability, turbulence and