Typhoon Nancy (1961)

Super Typhoon Nancy, also known as the , was an extremely powerful tropical cyclone of the 1961 Pacific typhoon season and one of the most intense tropical cyclones on record. The system possibly had the strongest winds ever measured in a tropical cyclone, with winds, tied with Hurricane Patricia of 2015. Nancy caused extensive damage, as well as at least 202 deaths and nearly 5,000 injuries in Japan and elsewhere, in September 1961.

Meteorological history

File:Nancy 1961 path.png

Map plotting the storm's track and intensity, according to the Saffir–Simpson scale

Map key

Template:WPTC track map key

A tropical depression formed from a low-pressure area near Kwajalein Atoll on September 7. It strengthened rapidly; by the time position fixes could be taken, Nancy was nearly a super typhoon, on September 8. Moving gradually westward, Nancy explosively deepened and reached wind speeds equivalent to a Category 5 super typhoon (Saffir–Simpson Hurricane Scale) on September 9. It would maintain that intensity for the next several days.

Shortly after reaching peak intensity, Nancy approached the Ryūkyū Islands and began turning. It passed near Okinawa and over Naze. The ridge steering Nancy broke down, and the typhoon turned sharply and headed towards Japan. Nancy made landfall as a strong typhoon on September 16 as it passed directly over Cape Muroto. Nancy made a second landfall on Honshū near Osaka. The typhoon rapidly traveled up the length of the island as it continued accelerating, eventually reaching a forward speed of . The typhoon quickly crossed over Hokkaidō before entering the Sea of Okhotsk as a tropical storm. Nancy went extratropical on September 17. The extratropical system eventually crossed over Kamchatka and entered the open ocean.

Impact

Significant typhoons with special names
(from the Japan Meteorological Agency)

Name	Number	Japanese name
Ida	T4518	Makurazaki Typhoon
Louise	T4523	Akune Typhoon
Marie	T5415	Tōya Maru Typhoon
Ida	T5822	Kanogawa Typhoon
Sarah	T5914	Miyakojima Typhoon
Vera	T5915	Isewan Typhoon
Nancy	T6118	2nd Muroto Typhoon
Cora	T6618	2nd Miyakojima Typhoon
Della	T6816	3rd Miyakojima Typhoon
Babe	T7709	Okinoerabu Typhoon
Faxai	T1915	Reiwa 1 Bōsō Peninsula Typhoon
Hagibis	T1919	Reiwa 1 East Japan Typhoon

Although there is no damage total known for Nancy, damage was "phenomenal" according to the JMA. There were at least 194 deaths and 8 people unaccounted for, according to the Japanese government.

Guam

On Guam, over half of all crops were destroyed by heavy winds and rain. A total of $40,000 (1961 USD) worth of damage was done to roads on the island. Most of the damage was on the southern end of the island. No deaths were reported on Guam.

Ryukyu Islands

On Okinawa, low-lying areas experienced heavy flooding, which did significant damage to agriculture and structures.

Japan

In Japan, according to Japan Fire and Disaster Management Agency official confirmed report, 194 people were killed, 8 were missing, and 4,972 people were injured. These totals made Nancy the sixth-deadliest typhoon to hit Japan at the time. Timely warnings and adequate preparations were probably responsible for the relatively low death toll. The damage was "small" relative to other typhoons that impacted densely populated areas of Japan.

Hundreds of thousands of people had their lives disrupted. Super Typhoon Nancy destroyed 11,539 houses, damaged 32,604 homes, and flooded 280,078 others. Although the exact number may never be known, the Stars and Stripes reported in late September 1961 that over 1,056 ships and fishing vessels were sunk or blown ashore, and that many more were damaged.

Floodwaters washed away 566 bridges and caused 1146 landslides. Roads were destroyed at a total of 2,053 locations. Damages in Osaka amounted to Template:US$billion.

On Amami-o-Shima, one person was missing and another was badly injured. A ship was sunk. Extensive flooding of crops and houses left 152 people homeless.

Due to Nancy's damage and death toll, the Japan Meteorological Agency named Nancy the "Second Muroto Typhoon". Nancy is one of only ten typhoons to receive special names in Japan.

Records

Most intense Pacific typhoons

	Typhoon	Season	Pressure
			hPa	inHg
1	Tip	1979	870	25.7
2	June	1975	875	25.8
	Nora	1973
4	Forrest	1983	876	25.9
5	Ida	1958	877	25.9
6	Rita	1978	878	26.0
7	Kit	1966	880	26.0
	Vanessa	1984
9	Nancy	1961	882	26.4
10	Irma	1971	884	26.1
11	Nina	1953	885	26.1
	Joan	1959
	Megi	2010
Source: JMA Typhoon Best Track Analysis Information for the North Western Pacific Ocean.

A reconnaissance aircraft flying into the typhoon near its peak intensity on September 12 determined Nancy's one-minute sustained winds to be . If these values are reliable, they would be the highest wind speeds ever measured in a tropical cyclone. However, it was later determined that measurements and estimations of wind speeds from the 1940s to 1960s were excessive. Thus, Nancy's winds may actually be lower than its official best-track value, which may actually be closer to . In 2016, reanalysis of Hurricane Patricia noted that the storm had the same sustained winds as Nancy, the highest on record in the Western Hemisphere.

Although the Saffir–Simpson hurricane wind scale (SSHWS) did not exist at the time, Nancy would have been a Category 5 equivalent for a total of five and a half days (or 132 hours), assuming the wind speed data is reliable. If so, this is the record for the Northern Hemisphere and more than a day longer than the runner-up system, 1962's Typhoon Karen.

See also

• List of tropical cyclone records
• Other storms of the same name
• 1934 Muroto typhoon - The most intense landfalling typhoon in Japanese history, with a peak low pressure of
• Typhoon Vera (1959) - The strongest storm to ever impact Japan, with maximum sustained wind speeds of upon landfall - Comparable to a Category 5-equivalent super typhoon
• Typhoon Mireille (1991) - Similar track, also very costly and destructive upon landfall
• Typhoon Neoguri (2014) - Similar track, though much weaker on landfall
• Hurricane Patricia (2015) - Ties Typhoon Nancy for one-minute maximum sustained winds of .
• Typhoon Jebi (2018) - Similar track, also caused massive damage in Japan
• Typhoon Hagibis (2019) - Another deadly and extremely destructive storm that became the costliest typhoon on record

External links

• JMA General Information of Typhoon Nancy (6118) from Digital Typhoon
• JTWC Report of Typhoon Nancy
• Storm Path of Typhoon Nancy