Halloween Wording
Damage from the Perfect Storm totaled over $200 million (1991 USD) and the death toll was thirteen. Most of the damage occurred while the storm was extratropical, after waves up to 30 ft (9.1 m) struck the coastline from Canada to Florida and southeastward to Puerto Rico. In Massachusetts, where damage was heaviest, over 100 homes were destroyed or severely damaged. To the north, more than 100 homes were affected in Maine, including the vacation home of then-President George H. W. Bush. More than 38,000 people were left without power, and along the coast high waves inundated roads and buildings. In portions of New England, damage was worse than Hurricane Bob had caused two months prior.
The Perfect Storm originated from a cold front that exited the east coast of the United States. On October 28, the front spawned an extratropical low to the east of Nova Scotia. Around that time, a ridge extended from the Appalachian Mountains northeastward to Greenland, with a strong high pressure center over eastern Canada. The blocking ridge forced the extratropical low to track toward the southeast and later to the west. Hurricane Grace was swept aloft by its cold front into the warm conveyor belt circulation of the deep cyclone on October 29. The cyclone significantly strengthened as a result of the temperature contrast between the cold air to the northwest and the warmth and humidity from the remnants of Hurricane Grace. The low pressure system continued deepening as it drifted toward the United States. It had an unusual retrograde motion for a nor'easter, beginning a set of meteorological circumstances that occur only once every 50 to 100 years. Most nor'easters affect New England from the southwest.
While situated about 390 mi (630 km) south of Halifax, Nova Scotia, the storm attained its peak intensity with winds of up to 70 mph (110 km/h). The nor'easter reached peak intensity at approximately 12:00 UTC on October 30 with its lowest pressure of 972 millibars. The interaction between the extratropical storm and the high pressure system to its north created a significant pressure gradient, which created large waves and strong winds. Between the southern New England coast and the storm's center, the gradient was 70 mbar (2.1 inHg). A buoy located 264 mi (425 km) south of Halifax reported a wave height of 100.7 ft (30.7 m) on October 30. This became the highest recorded wave height on the Scotian Shelf, which is the oceanic shelf off the coast of Nova Scotia. East of Cape Cod, a NOAA buoy located at 41°06′N 66°36′W / 41.1°N 66.6°W / 41.1; -66.6 reported maximum sustained winds of 56 mph (91 km/h) with gusts to 75 mph (120 km/h), and a significant wave height (average height of the highest waves) of 39 feet (12 m) around 15:00 UTC on October 30. Another buoy, located at 40°30′N 69°30′W / 40.5°N 69.5°W / 40.5; -69.5, reported maximum sustained winds of 61 mph with gusts to 72 mph (117 km/h) and a significant wave height of 31 ft (9 m) near 00:00 UTC on October 31.
Upon peaking in intensity, the nor'easter turned southward and gradually weakened; by November 1, its pressure had risen to 998 millibars (29.5 inHg). The low moved over warm waters of the Gulf Stream, where bands of convection around the center began to organize. Around this time, the system attained subtropical characteristics. On November 1, while the storm was moving in a counter-clockwise loop, a tropical cyclone had been identified at the center of the larger low. (Although these conditions are rare, Hurricane Karl during 1980 also formed within a larger non-tropical weather system.)
By around 14:00 UTC on November 1, an eye feature was forming, and the tropical cyclone reached its peak intensity with maximum sustained winds of 75 mph (120 km/h); these estimates, combined with reports from an Air Force Reserve Unit flight into the storm and confirmation that a warm-core center was present, indicated that the system had become a Category 1 hurricane on the Saffir–Simpson Hurricane Scale. The hurricane accelerated toward the northeast and quickly weakened back into a tropical storm. It made landfall near Halifax, Nova Scotia, at 14:00 UTC on November 2 with sustained winds of 45 mph (72 km/h). While the storm was approaching the coast, weather radars depicted curved rainbands on the western side of the system. After crossing over Prince Edward Island, it fully dissipated late on November 4.
For several days, weather models forecast the development of a significant storm off New England. However, the models were inadequate in forecasting coastal conditions, which in one instance prevented adequate warning. In addition, a post-storm assessment found an insufficient number of observation sites along the coast. On October 27, the Ocean Prediction Center noted that a "dangerous storm" would form within 36 hours, with its wording emphasizing the unusual nature of the storm. The National Weather Service likewise issued warnings for the potential storm, providing information to emergency service offices as well as the media. The public however was skeptical and did not recognize the threat. The timely warnings ultimately lowered the death toll; whereas the Perfect Storm caused 13 deaths, the blizzard of 1978 killed 99 people, and the 1938 New England hurricane killed 564 people.
From Massachusetts to Maine, thousands of people evacuated their homes and sought shelter. A state of emergency was declared for nine counties in Massachusetts, including Suffolk County, as well as two in Maine. In North Carolina, the National Weather Service offices in Hatteras and Raleigh first issued a heavy surf advisory on October 27, more than eight hours before the first reports of high waves. That same day, a coastal flood watch and later a warning was issued, along with a gale warning. The Hatteras NWS office ultimately released 19 coastal flood statements, as well as media reports explaining the threat from the wind and waves, and a state of emergency was declared for Dare County, North Carolina. The warnings and lead times in the region were described as "very good". In Canada, the threat from the storm prompted the cancellation of ferry service from Bar Harbor, Maine, to Yarmouth, Nova Scotia, as well as from Nova Scotia to Prince Edward Island and between Nova Scotia and Newfoundland. In its tropical cyclone report on the hurricane, the National Hurricane Center only referred to the system as "Unnamed Hurricane". The Natural Disaster Survey Report called the storm "The Halloween Nor'easter of 1991". The "perfect storm" moniker was coined by author and journalist Sebastian Junger after a conversation with NWS Boston Deputy Meteorologist Robert Case in which Case described the convergence of weather conditions as being "perfect" for the formation of such a storm. The NHC posted warnings on the unnamed hurricane in its High Seas and Offshore and Coastal Weather Forecasts in lieu of typical advisories which are issued for tropical cyclones under the agency's purview.
The Perfect Storm originated from a cold front that exited the east coast of the United States. On October 28, the front spawned an extratropical low to the east of Nova Scotia. Around that time, a ridge extended from the Appalachian Mountains northeastward to Greenland, with a strong high pressure center over eastern Canada. The blocking ridge forced the extratropical low to track toward the southeast and later to the west. Hurricane Grace was swept aloft by its cold front into the warm conveyor belt circulation of the deep cyclone on October 29. The cyclone significantly strengthened as a result of the temperature contrast between the cold air to the northwest and the warmth and humidity from the remnants of Hurricane Grace. The low pressure system continued deepening as it drifted toward the United States. It had an unusual retrograde motion for a nor'easter, beginning a set of meteorological circumstances that occur only once every 50 to 100 years. Most nor'easters affect New England from the southwest.
While situated about 390 mi (630 km) south of Halifax, Nova Scotia, the storm attained its peak intensity with winds of up to 70 mph (110 km/h). The nor'easter reached peak intensity at approximately 12:00 UTC on October 30 with its lowest pressure of 972 millibars. The interaction between the extratropical storm and the high pressure system to its north created a significant pressure gradient, which created large waves and strong winds. Between the southern New England coast and the storm's center, the gradient was 70 mbar (2.1 inHg). A buoy located 264 mi (425 km) south of Halifax reported a wave height of 100.7 ft (30.7 m) on October 30. This became the highest recorded wave height on the Scotian Shelf, which is the oceanic shelf off the coast of Nova Scotia. East of Cape Cod, a NOAA buoy located at 41°06′N 66°36′W / 41.1°N 66.6°W / 41.1; -66.6 reported maximum sustained winds of 56 mph (91 km/h) with gusts to 75 mph (120 km/h), and a significant wave height (average height of the highest waves) of 39 feet (12 m) around 15:00 UTC on October 30. Another buoy, located at 40°30′N 69°30′W / 40.5°N 69.5°W / 40.5; -69.5, reported maximum sustained winds of 61 mph with gusts to 72 mph (117 km/h) and a significant wave height of 31 ft (9 m) near 00:00 UTC on October 31.
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For several days, weather models forecast the development of a significant storm off New England. However, the models were inadequate in forecasting coastal conditions, which in one instance prevented adequate warning. In addition, a post-storm assessment found an insufficient number of observation sites along the coast. On October 27, the Ocean Prediction Center noted that a "dangerous storm" would form within 36 hours, with its wording emphasizing the unusual nature of the storm. The National Weather Service likewise issued warnings for the potential storm, providing information to emergency service offices as well as the media. The public however was skeptical and did not recognize the threat. The timely warnings ultimately lowered the death toll; whereas the Perfect Storm caused 13 deaths, the blizzard of 1978 killed 99 people, and the 1938 New England hurricane killed 564 people.
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