Question: Meteorologist Robert case is best known for naming the fourth hurricane and final tropical cyclone is the 1991 hurricane season in what ocean?

<P0-S0> The 1991 Perfect Storm, also known as The No-Name Storm (especially in the years immediately after it took place) and the Halloween Gale, was a nor'easter that absorbed Hurricane Grace and ultimately evolved back into a small unnamed hurricane late in its life cycle. <P0-S1>  The initial area of low pressure developed off Atlantic Canada on October 29. <P0-S2>  Forced southward by a ridge to its north, it reached its peak intensity as a large and powerful cyclone. <P0-S3>  The storm lashed the east coast of the United States with high waves and coastal flooding before turning to the southwest and weakening. <P0-S4>  Moving over warmer waters, the system transitioned into a subtropical cyclone before becoming a tropical storm. <P0-S5>  It executed a loop off the Mid-Atlantic states and turned toward the northeast. <P0-S6>  On November 1 the system evolved into a full-fledged hurricane with peak winds of 75 miles per hour (120 km/h), although the National Hurricane Center left it unnamed to avoid confusion amid media interest in the predecessor extratropical storm. <P0-S7>  It later received the name "the Perfect Storm" (playing off the common expression) after a conversation between Boston National Weather Service forecaster Robert Case and author Sebastian Junger. <P0-S8>  The system was the fourth hurricane and final tropical cyclone in the 1991 Atlantic hurricane season. <P0-S9>  The tropical system weakened, striking Nova Scotia as a tropical storm before dissipating. <SEP> <P1-S0> Robert Allen "Bob" Case (December 16, 1939 – June 19, 2008) was a meteorologist who worked for the National Weather Service (NWS) for 28 years. <P1-S1>  Over the course of his career, he worked in NWS various offices, developing a diverse background in various types of weather forecasting, including a lengthy stint as a hurricane forecaster. <P1-S2>  He is best known for inspiring the naming of the 1991 Perfect Storm as "The Perfect Storm." <SEP> <P2-S0> The 1852 Atlantic hurricane season was one of only three Atlantic hurricane seasons in which every known tropical cyclone attained hurricane status. <P2-S1>  Five tropical cyclones were reported during the season, which lasted from late August through the middle of October; these dates fall within the range of most Atlantic tropical cyclone activity, and none of the cyclones coexisted with another. <P2-S2>  Though there were officially five tropical cyclones in the season, hurricane scholar Michael Chenoweth assessed two of the cyclones as being the same storm. <P2-S3>  There may have been other unconfirmed tropical cyclones during the season, as meteorologist Christopher Landsea estimated that up to six storms were missed each year from the official database; this estimate was due to small tropical cyclone size, sparse ship reports, and relatively unpopulated coastlines. <SEP> <P3-S0> Hurricane Helene was the most intense tropical cyclone of the 1958 Atlantic hurricane season. <P3-S1>  The eighth tropical storm and fourth hurricane of the year, Helene was formed from a tropical wave east of the Lesser Antilles on September 21, 1958. <P3-S2>  Moving steadily westward, the storm slowly intensified, attaining hurricane strength on September 24. <P3-S3>  As conditions became increasingly favorable for tropical cyclone development, Helene began to rapidly intensify. <P3-S4>  Nearing the United States East Coast, the hurricane quickly attained Category 4 intensity on September 26, before it subsequently reached its peak intensity with maximum sustained winds of 150 mph (240 km/h) and a minimum barometric pressure of 930 mbar (hPa; 27.46 inHg). <P3-S5>  The intense hurricane came within 10 mi (15 km) of Cape Fear, North Carolina before recurving out to sea. <P3-S6>  Accelerating northward, Helene gradually weakened, and transitioned into an extratropical cyclone as it passed over Newfoundland on September 29. <P3-S7>  Helene's extratropical remnants traversed eastwards across the Atlantic Ocean before dissipating near Great Britain on October 4.