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

Context paragraphs:
Hurricane Hernan (1996): Hurricane Hernan was fourth and final tropical cyclone to strike Mexico at hurricane intensity during the 1996 Pacific hurricane season.  The thirteenth tropical cyclone, eighth named storm, and fifth hurricane of the season, Hernan developed as a tropical depression from a tropical wave to the south of Mexico on September 30.  The depression quickly strengthened, and became Tropical Storm Hernan later that day.  Hernan curved north-northwestward the following day, before eventually turning north-northeastward.  Still offshore of the Mexican coast on October 2, Hernan intensified into a hurricane.  Six hours later, Hernan attained its peak as an 85 mph (140 km/h) Category 1 hurricane on the Saffir-Simpson Hurricane Wind Scale (SSHWS).  After weakening somewhat, on 1000 UTC October 3, Hurricane Hernan made landfall near Barra de Navidad, Jalisco, with winds of 75 mph (120 km/h).  Only two hours after landfall, Hernan weakened to a tropical storm.  By October 4, Tropical Storm Hernan had weakened into a tropical depression, and dissipated over Nayarit on the following day.

Hurricane Eloise: Hurricane Eloise was the most destructive tropical cyclone of the 1975 Atlantic hurricane season.  The fifth tropical storm, fourth hurricane, and second major hurricane of the season, Eloise formed as a tropical depression on September 13 to the east of the Virgin Islands.  The depression tracked westward and intensified into a tropical storm while passing to the north of Puerto Rico.  Eloise briefly attained hurricane intensity soon thereafter, but weakened back to a tropical storm upon making landfall over Hispaniola.  A weak and disorganized cyclone, Eloise emerged into open waters of the northern Caribbean Sea; upon striking the northern Yucatan Peninsula, it turned north and began to re-intensify.  In the Gulf of Mexico, the cyclone quickly matured and became a Category 3 hurricane on September 23.  Eloise made landfall along the Florida Panhandle west of Panama City before moving inland across Alabama and dissipating on September 24.

1852 Atlantic hurricane season: The 1852 Atlantic hurricane season was one of only three Atlantic hurricane seasons in which every known tropical cyclone attained hurricane status.  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.  Though there were officially five tropical cyclones in the season, hurricane scholar Michael Chenoweth assessed two of the cyclones as being the same storm.  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.

Hurricane Helene (1958): Hurricane Helene was the most intense tropical cyclone of the 1958 Atlantic hurricane season.  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.  Moving steadily westward, the storm slowly intensified, attaining hurricane strength on September 24.  As conditions became increasingly favorable for tropical cyclone development, Helene began to rapidly intensify.  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).  The intense hurricane came within 10 mi (15 km) of Cape Fear, North Carolina before recurving out to sea.  Accelerating northward, Helene gradually weakened, and transitioned into an extratropical cyclone as it passed over Newfoundland on September 29.  Helene's extratropical remnants traversed eastwards across the Atlantic Ocean before dissipating near Great Britain on October 4.

1970 Canada hurricane: The 1970 Canada hurricane was an unnamed tropical cyclone that brought impact to Bermuda and Newfoundland.  The fourth hurricane and ninth tropical storm of the annual hurricane season, this system developed northeast of the Bahamas as a subtropical depression on October 12.  While tracking northeastward, the system intensified, becoming a subtropical storm on the following day.  The subtropical storm transitioned into a tropical cyclone on October 16, and strengthened into a hurricane about twelve hours later.  The hurricane later bypassed Bermuda, before further intensifying into a Category 2 hurricane on the Saffir–Simpson hurricane wind scale.  Thereafter, the hurricane accelerated rapidly northeastward, and made landfall on the Avalon Peninsula of Newfoundland as a Category 1 hurricane.  It transitioned into an extratropical cyclone early on October 17.

Robert Case: Robert Allen "Bob" Case (December 16, 1939 – June 19, 2008) was a meteorologist who worked for the National Weather Service (NWS) for 28 years.  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.  He is best known for inspiring the naming of the 1991 Perfect Storm as "The Perfect Storm."

1932 San Ciprian hurricane: The 1932 San Ciprian hurricane was a powerful Atlantic tropical cyclone that struck Puerto Rico during the 1932 Atlantic hurricane season.  The ninth tropical cyclone, fourth hurricane and third major hurricane of the 1932 season, the San Ciprian Hurricane formed on September 25 east of the Leeward Islands and moved due west where it quickly gained hurricane strength a day later.  After peaking as a Category 4 storm, the hurricane crossed the entire length of Puerto Rico at Category 4 strength.  The hurricane later struck the Dominican Republic as a Category 1 storm.  Weakened by its three landfalls, the storm continued to trek westward as a weak tropical storm before making its fourth and fifth landfalls in Belize and mainland Mexico.  The storm then dissipated on October 3.

1991 Perfect Storm: 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.  The initial area of low pressure developed off Atlantic Canada on October 29.  Forced southward by a ridge to its north, it reached its peak intensity as a large and powerful cyclone.  The storm lashed the east coast of the United States with high waves and coastal flooding before turning to the southwest and weakening.  Moving over warmer waters, the system transitioned into a subtropical cyclone before becoming a tropical storm.  It executed a loop off the Mid-Atlantic states and turned toward the northeast.  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.  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.  The system was the fourth hurricane and final tropical cyclone in the 1991 Atlantic hurricane season.  The tropical system weakened, striking Nova Scotia as a tropical storm before dissipating.

Hurricane Gordon (1994): Hurricane Gordon was a long-lived and catastrophic late-season hurricane of the 1994 Atlantic hurricane season.  The twelfth and final tropical cyclone of the season, Gordon formed in the southwestern Caribbean on November 8.  Without strengthening, the storm made landfall on Nicaragua.  Later on November 10, the storm began to strengthen as it tracked further from land, and it quickly strengthened into Tropical Storm Gordon, the seventh named storm that season.  Gordon also made landfalls in Jamaica and Cuba while a minimal tropical storm.  It entered the southwestern Atlantic while resembling a subtropical cyclone.  By the time it entered the Gulf of Mexico, it was fully tropical again.  Tropical Storm Gordon later crossed the Florida Keys, and turning to the northeast it made landfall in Fort Myers, Florida.  Gordon strengthened after it re-entered the Atlantic Ocean, becoming a hurricane on November 17.  It briefly threatened North Carolina while turning to the northwest, although it turned to the south and weakened.  Gordon deteriorated into a tropical depression and struck Florida again at that intensity on November 20.  It turned to the north and dissipated the next day over South Carolina.

1993 Atlantic hurricane season: The 1993 Atlantic hurricane season was a below average Atlantic hurricane season that produced ten tropical cyclones and tropical storms, four hurricanes, and one major hurricane.  It officially started on June 1 and ended on November 30, dates which conventionally delimit the period during which most tropical cyclones form in the Atlantic Ocean.  The first tropical cyclone, Tropical Depression One, developed on May 31, while the final storm, Tropical Depression Ten, dissipated on September 30, well before the average dissipation date of a season's last tropical cyclone; this represented the earliest end to the hurricane season in ten years.  The most intense hurricane, Emily, was a Category 3 on the Saffir–Simpson Hurricane Scale that paralleled close to the North Carolina coastline causing minor damage and a few deaths before moving out to sea.

Supporting paragraphs: Robert Case 1991 Perfect Storm
Answer: Atlantic