The Most Intense Tropical Storms on Earth Yet RecordedOn September 15th Super Typhoon Sanba reached its maximum intensity with 150-knot (175 mph) winds and a central pressure of 900 mb (26.58”) according to the Tropical Cyclone Information center at the Japanese Meteorological Agency. It was the strongest tropical storm on earth since Typhoon Megi bottomed out at 885 mb (26.14”) in the open waters of the Western Pacific on August 17, 2010. Herein is a short blog listing all the known tropical storms on record (in the world) that have measured central pressures of 900 mb or lower.
A perfect storm. Super Typhoon Sanba reached ‘perfect’ tropical storm genesis on September 15th this month. The outline of the Philippine Islands can be seen on the left of the image. Photo from NASA by the MODIS instrument aboard NASA's Aqua satellite.
The caveats to these listsWe have a fairly good record for the history of intense tropical storms in the North Atlantic Basin (which includes the Caribbean and Gulf of Mexico) going back to around 1900 (and even earlier) because of the great amount of ship traffic that has been traversing the Atlantic between Europe and the Americas for centuries, and then, beginning in 1970, weather satellites devoted to observing the weather over the Atlantic Ocean. However, this (a long observation period of record) cannot be said for the other ocean basins of the world where tropical storms frequently form.
By far, the most active region in the world for tropical storm formation is the Western Pacific Ocean (both North and South) where throughout history devastating typhoons have wreaked havoc from Australia to Japan. We know the 1940s were a particularly active decade in the Pacific due to the damage the typhoons caused to both the American and Japanese naval fleets during World War Two.
However, it was not until 1959 with the establishment of the Joint Typhoon Warning Center (JTWC) by the U.S. Navy in Guam that a dedicated effort was made to begin monitoring tropical storm activity in the West Pacific. Actually, the center was first formed in 1945 following Typhoon Cobra that, on December 18th 1944, sank dozens of U.S. war ships in the Pacific Ocean a few hundred miles east of the Philippines resulting in the loss of 790 U.S. Navy personnel: the worst U.S. military naval loss due to a single weather in history and also known as
Halsey's Typhoon named a after Admiral William 'Bull' Halsey commander of the
Third Fleet at the time.
The aircraft carrier USS Langley (CVL-27) lists dangerously during Typhoon Cobra east of the Philippines in December 1944. Some 790 U.S. sailors lost their lives during this storm, mostly when three destroyers, the USS Hull, USS Monaghan, and USS Spence capsized and sank accounting for 775 of the fatalities. Photo from Wikipedia file.
In 2000, the JTWC moved its headquarters to Pearl Harbor, Hawaii from where it now operates.
It should also be noted that the methods of determining an individual tropical storm’s minimum pressure have changed over time. In the Atlantic Basin prior to 1950 the pressures were measured by ships or surface stations. Since then the Hurricane Hunter aircraft have flown into storms and made pressure measurements by dropsondes. In the Pacific aircraft were also used from 1959 to 1987 when a new less costly (in dollars and lives) method came into use using the so-called Knaff-Zehr wind-pressure relationship.
Approximately 25 lives were lost during the years the U.S. Navy typhoon hunters made their passes between 1945-1987. The six above were investigating Typhoon Bless in October 1974 when their aircraft disappeared on a flight mission. From JTWC archives 1974.
This is a method of determining central air pressure by correlation to estimated maximum wind surface speeds. Consequently, there is some disagreement about how low a storm’s actual pressure may be between various agencies like the JTWC, the Tropical Cyclone Information arm of the Japanese Meteorological Agency, or the Australian Bureau of Meteorology. For instance, the JTWC estimated Typhoon Sanba’s lowest pressure at 911 mb vs. the 900 mb estimated by the Japanese Met. Service. The Japanese estimate seems closer to reality given Sanba’s peak sustained winds of 175 mph.
Aside from the Pacific and Atlantic, even less (so far as storm details like central barometric pressure) is known about historic cyclones that have occurred with regularity in the Indian Ocean region, especially the Bay of Bengal. Recently, beginning in 2003, the JTWC has undertaken observations for this region as well.
So the bottom line is that good statistics for the Atlantic Basin go back to 1900, for the W. Pacific Ocean to 1959, and for the Indian Ocean to 2003 (aside from land-based measurements).
Wind SpeedsThe winds of these storms are mostly estimated but virtually every storm with a pressure of 900 mb or less will produce maximum sustained winds of 140 knots (160 mph) or higher. Wind gusts of up to and over 200 mph have been measured by surface sites as well. The most intense storm of all, Typhoon Tip, saw a barometric pressure reading made by aircraft at 870 mb (25.69”) and sustained surface winds of 170 knots (195 mph). Some comments in the JTWC annual summary for 1979 can be read here from the their summary report in 1979:
Best Typhoon photoAn intense typhoon struck Polynesia’s Artua Atoll in the South Pacific during 1983 forcing the evacuation of the island’s residents. I've seen few clear images that have so well captured an evacuation from a perilous situation as this one image. Photo by Philippe Mazellier.
The TablesSince 1959 there have been 108 tropical storms worldwide whose minimum central barometric pressure has fallen to 900 mb (26.58”)or less that we are aware of. Prior to 1959 there are 12 other known cases of such storms. Of the 120 known such storms 108 have formed in the Western Pacific Ocean (98 in the Northwestern Pacific and 10 in the Southwestern Pacific). Only 5 tropical storms of this intensity are known to have occurred in the Atlantic Basin (including the Caribbean and Gulf of Mexico).
The past 6 years (since 2006) have seen a period of relative quiet so far as these monster tropical storms are concerned. Prior to Super Typhoon Sanba this month, there has been only one other 900 mb or stronger storm recorded on earth: Typhoon Megi in 2010. The 1990s was the decade with the most such storms with 1997 the single most active year with an amazing 10 such storms.
Here are the ‘Top Five’ strongest storms on record (so far as central pressure is concerned) by region:
NOTE: Hurricane Rita's pressure has been officially revised to 895 mb not 897 mb. Thanks to WU commentator '1900Hurricane' for the heads up about Rita!
Below is a comprehensive list of every known tropical storm in the world to have reached (or estimated to have reached) a central sea-surface barometric pressure reading of 900 mb (26.58”) or lower. This list has been culled from many sources although the JTWC database has provided the bulk of the information (since the vast number of such storms have occurred in the West and South Pacific Ocean). For the sake of clarity I have not included the actual day of each storms maximum intensity although I have that information for those who might be interested:
LOWEST BAROMETRIC PRESSURES EVER MEASURED IN TROPICAL STORMS WORLDWIDE
(900 mb or lower) as of September 2012**RANK/PRESSURE LOCATION DATE NAME 1) 870 (25.69) W. Pacific 1979 Tip
2) 872 (25.75) W. Pacific 1997 Joan
872 (25.75) W. Pacific 1997 Ivan
872 (25.75) W. Pacific 1992 Gay
3) 876 (25.86) W. Pacific 1983 Forrest
876 (25.86) W. Pacific 1975 June
4) 877 (25.89) W. Pacific 1973 Nora
877 (25.89) W. Pacific 1958 Ida
5) 878 (25.92) W. Pacific 2000 Damrey
878 (25.92) W. Pacific 1998 Zeb
878 (25.92) W. Pacific 1997 Keith
878 (25.92) W. Pacific 1992 Yvette
878 (25.92) W. Pacific 1978 Rita
6) 879 (25.95) W. Pacific 2004 Chaba
879 (25.95) S. Pacific 2002 Zoe
879 (25.95) W. Pacific 2001 Faxai
879 (25.95) W. Pacific 1995 Angela
879 (25.95) W. Pacific 1984 Vanessa
879 (25.96) Australia region 2006 Monica
7) 880 (26.01) W. Pacific 1966 Kit
8) 882 (26.05) Caribbean 2005 Wilma
882 (26.05) W. Pacific 1961 Nancy
882 (26.05) W. Pacific 1961 Violet
9) 884 (26.11) W. Pacific 1971 Irma
10)885 (26.14) W. Pacific 2010 Megi
885 (26.14) W. Pacific 2004 Dianmu
885 (26.14) W. Pacific 2003 Maemi
885 (26.14) W. Pacific 1991 Yuri
885 (26.14) W. Pacific 1990 Mike
11)886 (26.16) W. Pacific 1954 Ida
886 (26.16) W. Pacific 1951 Marge
886 (26.16) W. Pacific 1900 SS Arethusa
12)887 (26.18) W. Pacific 1979 Judy
887 (26.18) W. Pacific 1927 SS Sapoeroea
13)888 (26.22) Caribbean 1988 Gilbert
888 (26.22) W. Pacific 1983 Abby
14)890 (26.27) W. Pacific 1980 Wynne
890 (26.27) W. Pacific 1969 Elsie
890 (26.27) W. Pacific 1967 Gilda
15)891 (26.30) W. Pacific 2003 Lupit
891 (26.30) W. Pacific 1990 Flo
891 (26.30) W. Pacific 1987 Betty
891 (26.30) W. Pacific 1987 Nima
891 (26.30) W. Pacific 1959 Joan
891 (26.30) Bay of Bengal 1833 SS Duke of York
16)892 (26.35) S. Pacific 2005 Olaf
892 (26.35) W. Pacific 1997 Isa
892 (26.35) W. Pacific 1997 Ginger
892 (26.35) W. Pacific 1992 Elsie
892 (26.35) W. Pacific 1991 Ruth
892 (26.35) Long Key, Florida 1935 Labor Day Storm
(this is the lowest pressure ever observed at a land station on earth)
17)893 (26.37) W. Pacific 1981 Elysie
893 (26.37) W. Pacific 1973 Patsy
18)894 (26.39) W. Pacific 1964 Sally
19)895 (26.39) Gulf of Mexico 2005 Rita
895 (26.39) Indian Ocean 2004 Gafilo
895 (26.39) W. Pacific 1982 Mac
895 (26.42) W. Pacific 1976 Louise
895 (26.42) W. Pacific 1971 Amy
895 (26.42) W. Pacific 1970 Hope
20)896 (26.45) W. Pacific 1983 Marge
896 (26.45) W. Pacific 1959 Vera
21) 897 (26.48) W. Pacific 1985 Dot
897 (26.48) W. Pacific 1969 Viola
897 (26.48) W. Pacific 1962 Karen
22)898 (26.51) S. Pacific 2006 Glenda
898 (26.51) W. Pacific 2005 Nabi
898 (26.51) S. Pacific 2005 Bento
898 (26.51) S. Pacific 2005 Percy
898 (26.51) W. Pacific 2005 Haitang
898 (26.51) S. Pacific 2004 Heta
898 (26.51) W. Pacific 2004 Nida
898 (26.51) W. Pacific 2004 Ma-On
898 (26.51) S. Pacific 2003 Kalunde
898 (26.51) S. Pacific 2003 Inigo
898 (26.51) W. Pacific 2002 Harry
898 (26.51) W. Pacific 2001 Podul
898 (26.51) W. Pacific 2000 Saomai
898 (26.51) W. Pacific 2000 Bilis
898 (26.51) W. Pacific 1999 Bart
898 (26.51) W. Pacific 1997 Oliwa
898 (26.51) W. Pacific 1997 Winnie
898 (26.51) W. Pacific 1997 Rosie
898 (26.51) W. Pacific 1997 Nestor
898 (26.51) W. Pacific 1996 Dale
898 (26.51) W. Pacific 1996 Sally
898 (26.51) W. Pacific 1996 Herd
898 (26.51) W. Pacific 1996 Eve
898 (26.51) W. Pacific 1995 Ward
898 (26.51) W. Pacific 1995 Oscar
898 (26.51) W. Pacific 1995 Kent
898 (26.51) W. Pacific 1994 Doug
898 (26.51) W. Pacific 1993 Ed
898 (26.51) W. Pacific 1991 Walt
898 (26.51) W. Pacific 1990 Owen
898 (26.51) W. Pacific 1990 Page
898 (26.51) W. Pacific 1989 Nima
898 (26.51) W. Pacific 1989 Elsie
898 (26.51) W. Pacific 1989 Gordon
898 (26.51) W. Pacific 1989 Andy
898 (26.51) W. Pacific 1988 Nelson
898 (26.51) W. Pacific 1987 Lynn
898 (26.51) W. Pacific 1987 Holly
898 (26.51) Indian Ocean 1982 Damia
898 (26.51) W. Pacific 1979 Hope
898 (26.51) W. Pacific 1971 Nadine
23)899 (26.54) Caribbean 1980 Allen
24)900 (26.58) W. Pacific 2012 Sanba
900 (26.58) Australia region 2003 Inigo
900 (26.58) Australia region 1999 Gwenda
900 (26.58) S. Pacific 1998 Ron
900 (26.58) S. Pacific 1998 Susan
900 (26.58) E. Pacific 1997 Linda
900 (26.58) W. Pacific 1986 Progy
900 (26.58) W. Pacific 1975 Elsie
900 (26.58) W. Pacific 1957 Virginia
900 (26.58) W. Pacific 1957 Lola
900 (26.58) W. Pacific 1957 Hester
900 (26.58) W. Pacific 1954 Pamela
900 (26.58) W. Pacific 1953 Tess
** Ranking has been made chronologically, with more recent measurements ranking first Christopher C. Burt
Weather Historian