1951 Pacific hurricane season

	Category 1 hurricane (SSHWS)
Duration	June 1 – June 2
Peak intensity	85 mph (140 km/h) (1-min)

	Tropical storm (SSHWS)
Duration	May 17 – May 21
Peak intensity	50 mph (85 km/h) (1-min)

1951 Pacific hurricane season
	Season summary map
Seasonal boundaries
First system formed	May 17, 1951
Last system dissipated	November 30, 1951
Strongest storm
Name	Two and Eight
• Maximum winds	85 mph (140 km/h)
Seasonal statistics
Total storms	9 (10 unofficially)
Hurricanes	2
Major hurricanes; (Cat. 3+)	0
Total fatalities	0
Total damage	Unknown
Related articles
	1951 Atlantic hurricane season; 1951 Pacific typhoon season; 1950s North Indian Ocean cyclone seasons;

The 1951 Pacific hurricane season ran through the summer and fall of 1951. Nine tropical systems were observed during the season.[1]

Systems

Tropical Storm One

A tropical storm hit near Acapulco early in the season in May.[1]

Hurricane Two

A hurricane hit near Acapulco early in the season in June.[1]

Tropical Storm Three

Tropical storm (SSHWS)

Duration	June 26 – June 27
Peak intensity	50 mph (85 km/h) (1-min)

Three came close to land.[1]

Tropical Storm Four

Tropical storm (SSHWS)

Duration	July 5 – July 6
Peak intensity	50 mph (85 km/h) (1-min)

Tropical Storm Four existed from July 5 to July 6.[1]

Tropical Storm Five

Tropical storm (SSHWS)

Duration	August 3 – August 10
Peak intensity	50 mph (85 km/h) (1-min)

Tropical Storm Five existed from August 3 to August 10.[1]

Tropical Storm Six

Tropical storm (SSHWS)

Duration	August 24 – August 29
Peak intensity	50 mph (85 km/h) (1-min)

On August 24, a tropical storm was first observed south of Mexico. It paralleled the coastline, and moved northward into Baja California on the 28th. It dissipated the next day,[1] and caused moderate flooding in southern California.

Tropical Storm Seven

Tropical storm (SSHWS)

Duration	September 11 – September 15
Peak intensity	50 mph (85 km/h) (1-min)

Tropical Storm Seven existed from September 11 to September 15.[1]

Hurricane Eight

Category 1 hurricane (SSHWS)

Duration	September 23 – September 28
Peak intensity	85 mph (140 km/h) (1-min)

Hurricane Eight existed from September 23 to September 28.[1]

Tropical Storm Nine

Tropical storm (SSHWS)

Duration	November 27 – November 30
Peak intensity	50 mph (85 km/h) (1-min)

The final tropical cyclone of the season existed from November 27 to November 30.[1]

Other Systems

March Kona storm

A warm-core kona storm[2] transitioned into a tropical cyclone at 0000 UTC on March 21, west of the Necker Island. At that time, the Joint Typhoon Warning Center (JTWC) began tracking the storm with winds of 30 mph (50 km/h), or tropical depression strength. The system began traveling eastward, and later to the northeast on March 22. Then, it turned sharply southward towards Hawaii on the same day. The system turned southwest toward the Hawaiian Islands at 0600 UTC of March 25, making its first landfall near Hauula on Oahu at 1200 UTC that day.[3][4] The system weakened below tropical storm intensity as it passed through the island of Oahu.[2] By six hours later, the system left the island and continued southward. Then, the system slowed down and curved back north toward Oahu. The system made a second landfall on Oahu near Mākaha, just past 0000 UTC on March 28.[3][4] Later, the system scrapped the northwestern coast of the island. It re-entered the Pacific six hours later and turned west. The system then sped up and made its last landfall near Kealia, just past 0000 UTC on March 29.[3][4] The storm moved quickly across the island, and it left the island about six hours later. The JTWC stopped tracking the system east of the island of Nihoa eighteen hours later, after it had started to move across the Northwestern Hawaiian Islands.[3][4]

The system has been considered a tropical or an extratropical cyclone. The JTWC[3] and the American Meteorological Society (AMS) both consider the storm to be a tropical cyclone.[2] However, the Regional Specialized Meteorological Centers for the eastern north Pacific, the National Hurricane Center (NHC) and Central Pacific Hurricane Center (CPHC) do not include the system in their archives. Due to this, the system was not considered tropical or subtropical officially.[1] On March 25, tropical storm warnings were posted for the Hawaiian Islands. Winds of 60 mph (95 km/h) were reported in Oahu as the storm came near the island. In Honolulu, six inches (15 cm) of rain was reported.[2] The system contributed to the already above-average rainfall in the Hawaiian Islands. The rainfall amount for March 1951 was nearly 200 to 700 percent above normal.[5] The rainfall set records for that month, but they were later broken in 2006.[6]

References

National Hurricane Center; Hurricane Research Division; Central Pacific Hurricane Center. "The Northeast and North Central Pacific hurricane database 1949–2019". United States National Oceanic and Atmospheric Administration's National Weather Service. Retrieved 1 October 2020. A guide on how to read the database is available here.
Simpson, R. H. (February 1952). "Evolution of a Kona Storm, a Subtropical Cyclone". Journal of Meteorology. American Meteorological Society. 9 (1): 34–35. Bibcode:1952JAtS....9...24S. doi:10.1175/1520-0469(1952)009<0024:EOTKSA>2.0.CO;2. ISSN 0095-9634.
"Tropical system One Best Track". Joint Typhoon Warning Center. Retrieved June 7, 2014.
Knapp, Kenneth R.; Kruk, Michael C.; Levinson, David H.; Diamond, Howard J.; Neumann, Charles J. (2010). 1951 MISSING (1951080N23195). The International Best Track Archive for Climate Stewardship (IBTrACS): Unifying tropical cyclone best track data (Report). Bulletin of the American Meteorological Society. Archived from the original on March 5, 2016. Retrieved June 7, 2014.
Winston, Jay S. (March 1951). "The Weather and Circulation of March 1951" (PDF). Monthly Weather Review. American Meteorological Society. 79 (3): 54. Bibcode:1951MWRv...79...50W. doi:10.1175/1520-0493(1951)079<0050:TWACOM>2.0.CO;2. ISSN 1520-0493. Retrieved June 7, 2014.
Tyau-Beam, Carol (June 2006). "Record Rainfall Totals" (PDF). Hawaii Flood Management News. Hawaii Department of Land and Natural Resources – Engineering Division (June 2006): 3. Retrieved June 8, 2014.

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[EPAC_HURDAT-1] National Hurricane Center; Hurricane Research Division; Central Pacific Hurricane Center. "The Northeast and North Central Pacific hurricane database 1949–2019". United States National Oceanic and Atmospheric Administration's National Weather Service. Retrieved 1 October 2020. A guide on how to read the database is available here.

[MWR2-2] Simpson, R. H. (February 1952). "Evolution of a Kona Storm, a Subtropical Cyclone". Journal of Meteorology. American Meteorological Society. 9 (1): 34–35. Bibcode:1952JAtS....9...24S. doi:10.1175/1520-0469(1952)009<0024:EOTKSA>2.0.CO;2. ISSN 0095-9634.

[BT-3] "Tropical system One Best Track". Joint Typhoon Warning Center. Retrieved June 7, 2014.

[IBTRACS-4] Knapp, Kenneth R.; Kruk, Michael C.; Levinson, David H.; Diamond, Howard J.; Neumann, Charles J. (2010). 1951 MISSING (1951080N23195). The International Best Track Archive for Climate Stewardship (IBTrACS): Unifying tropical cyclone best track data (Report). Bulletin of the American Meteorological Society. Archived from the original on March 5, 2016. Retrieved June 7, 2014.

[MWR1-5] Winston, Jay S. (March 1951). "The Weather and Circulation of March 1951" (PDF). Monthly Weather Review. American Meteorological Society. 79 (3): 54. Bibcode:1951MWRv...79...50W. doi:10.1175/1520-0493(1951)079<0050:TWACOM>2.0.CO;2. ISSN 1520-0493. Retrieved June 7, 2014.

[Flood-6] Tyau-Beam, Carol (June 2006). "Record Rainfall Totals" (PDF). Hawaii Flood Management News. Hawaii Department of Land and Natural Resources – Engineering Division (June 2006): 3. Retrieved June 8, 2014.