Hurricane Calendar · On this day

Hurricanes on December 18 in history (1842 to 2026)

182 storms on record were active on December 18 between 1884 and 2025. On this date 21 formed, 9 reached their peak recorded wind, 15 came ashore and 27 ended. The strongest storm active on December 18 was Typhoon Ruth (1955), with a peak 1-minute sustained wind of 180 kt (207 mph), recorded by JTWC.

Dates are calendar dates in UTC. Typhoons and cyclones are the same kind of storm as hurricanes, named by region. Archive of September 29, 2026.

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Tracks of the 68 storms that formed, peaked, came ashore or ended on December 18
Recorded trackCame ashore on December 18Tracks of the 68 storms that formed, peaked, came ashore or ended on December 18, from NOAA best-track records. Simplified outlines.

Storm of the day in the app

Typhoon Mary (1977)

First recorded position: December 18, 1977, 06:00 UTC. Peak: 85 kt · 10-minute (JMA). Western Pacific, Dec 18, 1977 to Jan 8, 1978.

In Hurricane Calendar, replay Mary along its recorded track, with the wind at each step and the agency that measured it.

Came ashore on December 18

15 storms, most recent first. Recorded landfalls come from the National Hurricane Center's best track; elsewhere a coast crossing is estimated from the track and labelled.

YearStormOceanWhere and whenWind at landfallRecord
2023Tropical storm JelawatWestern PacificCoast crossing (estimated) near 7.3°N, 126.7°E
December 18, 2023, 00:00 UTC
Not recordedEstimated from the track
2020Tropical storm KrovanhWestern Pacific → North IndianCoast crossing (estimated) near 7.6°N, 126.7°E
December 18, 2020, 03:00 UTC
Not recordedEstimated from the track
2015Unnamed tropical depression · 2015Western PacificCoast crossing (estimated) near 7.3°N, 126.9°E
December 18, 2015, 18:00 UTC
Not recordedEstimated from the track
2010Unnamed tropical depression · 2010Australian regionCoast crossing (estimated) near 23.0°S, 113.6°E
December 18, 2010, 00:00 UTC
25 kt (29 mph), 10-minute, BoMEstimated from the track
1994Cyclone AnnetteAustralian regionCoast crossing (estimated) near 19.3°S, 120.7°E
December 18, 1994, 06:00 UTC
100 kt (115 mph), 10-minute, BoMEstimated from the track
1990Unnamed cyclone · 1990North IndianCoast crossing (estimated) near 21.1°N, 92.1°E
December 18, 1990, 15:00 UTC
Not recordedEstimated from the track
1973Cyclone UnaAustralian region → South PacificCoast crossing (estimated) near 19.4°S, 147.1°E
December 18, 1973, 17:00 UTC
35 kt (40 mph), 10-minute, BoMEstimated from the track
1966Unnamed storm · 1966Western PacificCoast crossing (estimated) near 7.5°N, 127.1°E
December 18, 1966, 15:00 UTC
Not recordedEstimated from the track
1959Typhoon GildaWestern PacificCoast crossing (estimated) near 12.2°N, 121.8°E
December 18, 1959, 21:00 UTC
Not recordedEstimated from the track
1959Typhoon GildaWestern PacificCoast crossing (estimated) near 12.2°N, 125.7°E
December 18, 1959, 00:00 UTC
Not recordedEstimated from the track
1958Unnamed storm · 1958Southwest IndianCoast crossing (estimated) near 21.0°S, 43.0°E
December 18, 1958, 09:00 UTC
Not recordedEstimated from the track
1946Unnamed storm · 1946Australian regionCoast crossing (estimated) near 16.2°S, 123.6°E
December 18, 1946, 00:00 UTC
Not recordedEstimated from the track
1939Unnamed storm · 1939Western PacificCoast crossing (estimated) near 11.7°N, 126.2°E
December 18, 1939, 06:00 UTC
Not recordedEstimated from the track
1907Unnamed storm · 1907Southwest IndianCoast crossing (estimated) near 22.9°S, 43.3°E
December 18, 1907, 12:00 UTC
Not recordedEstimated from the track
1904Unnamed storm · 1904Southwest IndianCoast crossing (estimated) near 13.2°S, 41.0°E
December 18, 1904, 03:00 UTC
Not recordedEstimated from the track
1886Unnamed storm · 1886Western PacificCoast crossing (estimated) near 9.2°N, 123.5°E
December 18, 1886, 04:00 UTC
Not recordedEstimated from the track

Formed on December 18

21 storms had their first recorded position on this date.

SeasonStormOceanFirst positionPeak
1993Tropical storm NellWestern Pacific4.7°N, 158.8°E60 kt · 10-minute (JMA)
1963Typhoon SusanWestern Pacific2.3°N, 173.8°E135 kt · 1-minute (JTWC)
1977Typhoon MaryWestern Pacific5.0°N, 171.0°E85 kt · 10-minute (JMA)
2025–26Cyclone GrantAustralian region → Southwest Indian12.2°S, 110.4°E119 kt · 1-minute (Real-time)
1981–82Cyclone GyanSouth Pacific9.0°S, 172.0°E100 kt · 10-minute (MetService NZ)
2016–17Cyclone YvetteAustralian region14.9°S, 116.3°E45 kt · 10-minute (BoM)
1983–84Cyclone EstherAustralian region6.1°S, 129.6°E50 kt · 10-minute (BoM)
1974Tropical storm KitWestern Pacific8.7°N, 140.1°E40 kt · 1-minute (JTWC)
1965Tropical storm GloriaWestern Pacific → North Indian8.6°N, 110.8°E40 kt · 1-minute (JTWC)
1969Tropical storm MarieWestern Pacific9.7°N, 146.3°E50 kt · 1-minute (JTWC)
1992Unnamed cyclone · 1992North Indian2.6°N, 74.5°E50 kt · 1-minute (JTWC)
2016–17Unnamed tropical depression · 2016Australian region10.5°S, 129.5°E30 kt · 10-minute (BoM)
1987–88Unnamed cyclone · 1987South Pacific7.5°S, 176.5°E35 kt · 1-minute (JTWC)
1998Unnamed tropical depression · 1998Western Pacific12.9°N, 113.1°E30 kt · 1-minute (JTWC)
1968–69Storm BeatieAustralian region12.4°S, 108.4°ENot recorded
Show 6 more storms
SeasonStormOceanFirst positionPeak
1952–53Unnamed storm · 1952Southwest Indian19.9°S, 36.8°ENot recorded
1950–51Unnamed storm · 1950Southwest Indian9.0°S, 62.9°ENot recorded
1926–27Unnamed storm · 1926Australian region14.0°S, 121.3°ENot recorded
1974–75Unnamed storm · 1974South Pacific15.2°S, 175.5°WNot recorded
1934–35Unnamed storm · 1934Southwest Indian12.9°S, 53.3°ENot recorded
1911–12Unnamed storm · 1911Southwest Indian11.6°S, 43.4°ENot recorded

Reached peak wind on December 18

9 storms recorded their highest wind on this date, as the responsible agency measured it.

SeasonStormOceanPeak windLowest pressure
1994–95Cyclone AnnetteAustralian region100 kt (115 mph), 10-minute, BoM925 hPa (BoM)
1990Typhoon RussWestern Pacific100 kt (115 mph), 10-minute, JMA915 hPa (JMA)
1976–77Cyclone TedAustralian region100 kt (115 mph), 10-minute, BoM945 hPa (BoM)
1960Typhoon PhyllisWestern Pacific105 kt (121 mph), 1-minute, JTWC965 hPa (JMA)
1973–74Cyclone UnaAustralian region → South Pacific55 kt (63 mph), 10-minute, BoM985 hPa (BoM)
1985Tropical storm IrvingWestern Pacific50 kt (58 mph), 10-minute, JMA992 hPa (JMA)
2008–09Cyclone CindaSouthwest Indian50 kt (58 mph), 10-minute, Météo-France985 hPa (JTWC)
1974Tropical storm JudyWestern Pacific40 kt (46 mph), 1-minute, JTWC1000 hPa (JMA)
1971–72Cyclone VivienneSouth Pacific40 kt (46 mph), 10-minute, MetService NZ990 hPa (MetService NZ)

Ended on December 18

27 storms had their last recorded position on this date.

SeasonStormOceanLast positionDates
1964Typhoon OpalWestern Pacific29.4°N, 143.0°EDec 8 to 18, 1964
1955Typhoon RuthWestern Pacific33.5°N, 163.5°EDec 12 to 18, 1955
1993–94Cyclone NaomiAustralian region24.1°S, 122.2°EDec 14 to 18, 1993
2008Typhoon DolphinWestern Pacific24.8°N, 143.0°EDec 8 to 18, 2008
1972–73Cyclone DianaSouth Pacific32.8°S, 174.0°EDec 6 to 18, 1972
2025–26Cyclone BakungAustralian region10.1°S, 91.8°EDec 12 to 18, 2025
1982–83Cyclone LisaSouth Pacific33.0°S, 143.0°WDec 10 to 18, 1982
1983Tropical storm ThelmaWestern Pacific19.0°N, 144.0°EDec 13 to 18, 1983
1991–92Cyclone ArthurSouth Pacific19.0°S, 131.0°WDec 13 to 18, 1991
1980–81Cyclone DanAustralian region13.6°S, 105.4°EDec 14 to 18, 1980
Show 17 more storms
SeasonStormOceanLast positionDates
2023Tropical storm JelawatWestern Pacific7.7°N, 125.1°EDec 14 to 18, 2023
1998–99Unnamed cyclone · 1998Australian region → South Pacific39.5°S, 168.4°EDec 13 to 18, 1998
1978Unnamed storm · 1978Western Pacific11.5°N, 113.1°EDec 13 to 18, 1978
1973Unnamed storm · 1973Western Pacific6.0°N, 116.5°EDec 15 to 18, 1973
1912Unnamed storm · 1912North Indian7.0°N, 78.3°EDec 17 to 18, 1912
1907–08Unnamed storm · 1907Southwest Indian24.6°S, 47.0°EDec 10 to 18, 1907
1904–05Unnamed storm · 1904Southwest Indian13.4°S, 40.5°EDec 10 to 18, 1904
1902–03Unnamed storm · 1902Southwest Indian24.5°S, 48.1°EDec 9 to 18, 1902
1889Unnamed storm · 1889North Indian10.4°N, 79.7°EDec 17 to 18, 1889
1884Unnamed storm · 1884North Indian11.5°N, 79.4°EDec 14 to 18, 1884
1939–40Unnamed storm · 1939Southwest Indian25.9°S, 59.9°EDec 13 to 18, 1939
1934–35Unnamed storm · 1934Southwest Indian25.0°S, 63.2°EDec 11 to 18, 1934
1925–26Unnamed storm · 1925Southwest Indian25.0°S, 66.3°EDec 11 to 18, 1925
1910–11Unnamed storm · 1910Australian region27.6°S, 151.8°EDec 16 to 18, 1910
1897–98Unnamed storm · 1897Southwest Indian31.9°S, 62.6°EDec 11 to 18, 1897
1885–86Unnamed storm · 1885Southwest Indian31.8°S, 62.6°EDec 11 to 18, 1885
1885–86Unnamed storm · 1885Southwest Indian28.1°S, 56.4°EDec 11 to 18, 1885

Also active on December 18

114 more storms were active on this date, the most notable first. Storms listed above are not repeated.

SeasonStormOceanDatesPeak
1997Typhoon PakaCentral Pacific → Western PacificNov 28 to Dec 23, 1997100 kt · 10-minute (JMA)
2021Typhoon RaiWestern PacificDec 11 to 21, 2021105 kt · 10-minute (JMA)
2011Tropical storm WashiWestern PacificDec 11 to 19, 201150 kt · 10-minute (JMA)
2020–21Cyclone YasaSouth PacificDec 11 to 21, 2020125 kt · 10-minute (FMS)
2001Typhoon FaxaiWestern PacificDec 13 to 26, 2001105 kt · 10-minute (JMA)
2006–07Cyclone BondoSouthwest IndianDec 15 to 28, 2006110 kt · 10-minute (Météo-France)
2009–10Cyclone LaurenceAustralian regionDec 8 to 23, 2009110 kt · 10-minute (BoM)
2013–14Cyclone BruceAustralian region → Southwest IndianDec 16 to 25, 2013120 kt · 10-minute (Météo-France)
1953Typhoon DorisWestern PacificDec 9 to 23, 1953150 kt · 1-minute (JTWC)
2022–23Cyclone DarianAustralian region → Southwest IndianDec 12, 2022 to Jan 2, 2023125 kt · 10-minute (BoM)
1989–90Cyclone AliberaSouthwest IndianDec 14, 1989 to Jan 7, 199072 kt · 10-minute (Météo-France)
2012–13Cyclone EvanSouth PacificDec 10 to 27, 2012100 kt · 10-minute (FMS)
1981Typhoon KitWestern PacificDec 9 to 22, 1981100 kt · 10-minute (JMA)
2018–19Cyclone CilidaSouthwest IndianDec 16 to 28, 2018115 kt · 10-minute (Météo-France)
1979–80Cyclone ClaudetteAustralian region → Southwest IndianDec 9 to 28, 1979110 kt · 10-minute (BoM)
2013–14Cyclone AmaraSouthwest IndianDec 14 to 28, 2013110 kt · 10-minute (Météo-France)
1951Typhoon AmyWestern PacificDec 3 to 19, 1951120 kt · 1-minute (JTWC)
1994Typhoon AxelWestern PacificDec 10 to 27, 199485 kt · 10-minute (JMA)
2008–09Cyclone BillyAustralian regionDec 16, 2008 to Jan 4, 200995 kt · 10-minute (BoM)
1952Typhoon GloriaWestern PacificDec 16 to 25, 1952130 kt · 1-minute (JTWC)
2018–19Cyclone KenangaAustralian region → Southwest IndianDec 14 to 24, 201840 kt · 10-minute (BoM)
1990–91Cyclone JoySouth Pacific → Australian regionDec 15 to 27, 199090 kt · 10-minute (BoM)
1987Typhoon PhyllisWestern PacificDec 9 to 20, 198775 kt · 10-minute (JMA)
1986Typhoon MargeWestern PacificDec 9 to 25, 198685 kt · 10-minute (JMA)
1980–81Cyclone CarolAustralian region → Southwest IndianDec 13 to 24, 1980110 kt · 10-minute (BoM)
Show 89 more storms
SeasonStormOceanDatesPeak
1978–79Cyclone AngeleSouthwest IndianDec 13, 1978 to Jan 5, 197982 kt · 10-minute (Météo-France)
2018–19Cyclone OwenAustralian regionNov 30 to Dec 22, 201885 kt · 10-minute (BoM)
1988–89Cyclone IlonaAustralian regionDec 12 to 19, 198880 kt · 10-minute (BoM)
1985Typhoon HopeWestern PacificDec 13 to 25, 198590 kt · 10-minute (JMA)
1991–92Cyclone AlexandraSouthwest IndianDec 17 to 29, 199156 kt · 10-minute (Météo-France)
2016Cyclone VardahNorth IndianDec 6 to 19, 201670 kt · 3-minute (IMD)
1981–82Cyclone BenedicteSouthwest IndianDec 17 to 25, 198172 kt · 10-minute (Météo-France)
1995–96Cyclone GertieAustralian region → South PacificDec 14 to 24, 199575 kt · 10-minute (BoM)
1989–90Cyclone FelicityAustralian region → South PacificDec 12 to 22, 198975 kt · 10-minute (BoM)
2003–04Cyclone DebbieAustralian regionDec 16 to 23, 200365 kt · 10-minute (BoM)
1984Hurricane LiliAtlanticDec 12 to 24, 1984Category 1 · Saffir-Simpson (NHC)
1993–94Cyclone CeciliaSouthwest IndianDec 11 to 21, 199355 kt · 10-minute (Météo-France)
2003–04Cyclone CelaSouthwest IndianDec 4 to 22, 200365 kt · 10-minute (Météo-France)
1996Tropical storm FernWestern PacificDec 17 to 30, 199660 kt · 10-minute (JMA)
1986–87Cyclone PatsySouth PacificDec 12 to 22, 198660 kt · 10-minute (MetService NZ)
2019–20Cyclone CalviniaSouthwest IndianDec 17, 2019 to Jan 3, 202065 kt · 10-minute (Météo-France)
1988–89Cyclone EsetaSouth PacificDec 17 to 28, 198855 kt · 10-minute (MetService NZ)
1973–74Cyclone CecilyAustralian regionDec 11 to 19, 197370 kt · 10-minute (BoM)
1979Tropical storm BenWestern PacificDec 16 to 23, 197945 kt · 10-minute (JMA)
1980Tropical storm EdWestern PacificDec 14 to 24, 198045 kt · 10-minute (JMA)
2017Tropical storm Kai-TakWestern PacificDec 12 to 23, 201740 kt · 10-minute (JMA)
1967Tropical storm IvyWestern PacificDec 16 to 21, 196760 kt · 1-minute (JTWC)
1952Tropical storm FayeWestern PacificDec 13 to 20, 195245 kt · 1-minute (JTWC)
1996–97Cyclone OpheliaAustralian regionDec 13 to 27, 199655 kt · 10-minute (BoM)
1994Tropical storm BobbieWestern PacificDec 14 to 29, 199450 kt · 10-minute (JMA)
2009–10Cyclone DavidSouthwest IndianDec 12 to 31, 200945 kt · 10-minute (Météo-France)
1976–77Cyclone HarryAustralian region → Southwest IndianDec 15 to 21, 197655 kt · 10-minute (BoM)
2004Tropical storm NoruWestern PacificDec 16 to 23, 200440 kt · 10-minute (JMA)
1972Tropical storm VioletWestern PacificDec 11 to 21, 197255 kt · 1-minute (JTWC)
2006Tropical storm TramiWestern PacificDec 15 to 20, 200635 kt · 10-minute (JMA)
1977–78Cyclone CelimeneAustralian region → Southwest IndianDec 13 to 23, 197750 kt · 10-minute (BoM)
2004Tropical storm TalasWestern PacificDec 9 to 20, 200440 kt · 10-minute (JMA)
2007–08Cyclone DamaSouthwest IndianDec 17 to 24, 200735 kt · 10-minute (Météo-France)
2010Tropical storm OmekaCentral Pacific → Western Pacific → Central PacificDec 16 to 22, 201045 kt · 1-minute (NHC)
1992–93Cyclone KenAustralian region → Southwest IndianDec 17 to 24, 199240 kt · 10-minute (BoM)
2005Unnamed tropical storm · 2005Western PacificDec 15 to 21, 200545 kt · 1-minute (JTWC)
2007–08Cyclone CelinaSouthwest IndianDec 11 to 23, 200740 kt · 10-minute (Météo-France)
1970–71Cyclone PriscillaSouth PacificDec 16 to 19, 197040 kt · 10-minute (MetService NZ)
1963Tropical storm RitaWestern PacificDec 15 to 22, 196340 kt · 1-minute (JTWC)
1979–80Cyclone BereniceSouthwest IndianDec 15 to 21, 197935 kt · 1-minute (JTWC)
1962–63Cyclone CecileSouthwest IndianDec 16 to 29, 196235 kt · 1-minute (JTWC)
1987Unnamed tropical depression · 1987North IndianDec 17 to 23, 198730 kt · 3-minute (IMD)
2022Unnamed tropical depression · 2022North IndianDec 12 to 19, 202230 kt · 3-minute (IMD)
1980Unnamed cyclone · 1980North IndianDec 10 to 20, 198035 kt · 1-minute (JTWC)
2005Unnamed tropical depression · 2005North IndianDec 14 to 24, 200530 kt · 3-minute (IMD)
1998Unnamed tropical depression · 1998Western PacificDec 17 to 19, 199825 kt · 1-minute (JTWC)
1975–76Storm BarbaraSouthwest IndianDec 3 to 19, 1975Not recorded
1971–72Storm AgnesSouthwest IndianDec 9 to 24, 1971Not recorded
1966–67Storm ColetteSouthwest IndianDec 11 to 22, 1966Not recorded
2005–06Unnamed cyclone · 2005Southwest Indian → Australian region → Southwest IndianDec 17 to 29, 200535 kt · 1-minute (JTWC)
1968–69Storm AmberAustralian region → Southwest Indian → Australian region → Southwest IndianDec 15 to 24, 1968Not recorded
1960–61Unnamed storm · 1960Australian regionDec 14 to 24, 1960Not recorded
1996Unnamed tropical depression · 1996Western PacificDec 12 to 21, 199630 kt · 1-minute (JTWC)
1956–57Unnamed storm · 1956Australian region → South PacificDec 16 to 26, 1956Not recorded
2020–21Storm ZazuSouth PacificDec 16 to 19, 2020Not recorded
1980–81Storm DianaSouthwest IndianDec 17 to 19, 1980Not recorded
1973–74Storm ChristianeSouthwest IndianDec 13 to 22, 1973Not recorded
1972–73Storm BeatriceSouthwest IndianDec 7 to 25, 1972Not recorded
1970–71Storm DominiqueSouthwest IndianDec 11 to 28, 1970Not recorded
1967–68Storm BelindaSouthwest IndianDec 8 to 23, 1967Not recorded
1964–65Storm ConnieSouthwest IndianDec 17 to 21, 1964Not recorded
1920–21Unnamed storm · 1920Australian regionDec 16 to 24, 1920Not recorded
1964Unnamed storm · 1964North IndianDec 17 to 24, 1964Not recorded
1948–49Unnamed storm · 1948Southwest IndianDec 14 to 27, 1948Not recorded
1943Unnamed storm · 1943Western PacificDec 17 to 22, 1943Not recorded
1941Unnamed storm · 1941Western PacificDec 12 to 21, 1941Not recorded
1940Unnamed storm · 1940Western PacificDec 8 to 24, 1940Not recorded
1935Unnamed storm · 1935Western PacificDec 16 to 24, 1935Not recorded
1924Unnamed storm · 1924Western PacificDec 13 to 23, 1924Not recorded
1920–21Unnamed storm · 1920Australian regionDec 17 to 25, 1920Not recorded
1917–18Unnamed storm · 1917South Pacific → Australian region → South PacificDec 14 to 19, 1917Not recorded
1917–18Unnamed storm · 1917Australian regionDec 17 to 20, 1917Not recorded
1911–12Unnamed storm · 1911Southwest IndianDec 16 to 21, 1911Not recorded
1904–05Unnamed storm · 1904Southwest IndianDec 11 to 20, 1904Not recorded
1899–00Unnamed storm · 1899Southwest IndianDec 10 to 23, 1899Not recorded
1899–00Unnamed storm · 1899Southwest IndianDec 10 to 24, 1899Not recorded
1899–00Unnamed storm · 1899Southwest IndianDec 11 to 26, 1899Not recorded
1983Unnamed storm · 1983Western PacificDec 17 to 19, 1983Not recorded
1952–53Unnamed storm · 1952Australian region → South PacificDec 15 to 19, 1952Not recorded
1971Unnamed storm · 1971North IndianDec 14 to 21, 1971Not recorded
1967–68Unnamed storm · 1967South PacificDec 14 to 20, 1967Not recorded
1966Unnamed storm · 1966North IndianDec 15 to 19, 1966Not recorded
1963–64Unnamed storm · 1963South PacificDec 17 to 22, 1963Not recorded
1957–58Unnamed storm · 1957Australian regionDec 16 to 19, 1957Not recorded
1952–53Unnamed storm · 1952Southwest IndianDec 15 to 20, 1952Not recorded
1949–50Unnamed storm · 1949South PacificDec 15 to 21, 1949Not recorded
1925Unnamed storm · 1925Western PacificDec 14 to 20, 1925Not recorded
1923Unnamed storm · 1923North IndianDec 17 to 22, 1923Not recorded
1912Unnamed storm · 1912Western PacificDec 16 to 21, 1912Not recorded

Questions about December 18

What is the strongest storm on record on December 18?

Of the storms active on December 18, Typhoon Ruth (1955) had the highest peak wind recorded by a U.S. agency: 180 kt (207 mph), 1-minute sustained (JTWC). That is the storm's peak over its whole life, which may fall on another day. Agencies that average wind over 10 minutes report lower numbers for the same storm.

Has a storm ever made landfall on December 18?

Yes. 15 storms on record came ashore on December 18. The most recent was Tropical storm Jelawat (2023): coast crossing (estimated) near 7.3°N, 126.7°E. Some coast crossings are estimated from the track, and each one is labelled.

How many storms were active on December 18?

182 storms on record were active on December 18, in 96 different years from 1884 to 2025. The count uses calendar dates in UTC and covers every ocean basin in NOAA's IBTrACS archive and the National Hurricane Center's HURDAT2.

Replay every December 18 storm on its track. See the whole track, the wind at each step and the agency that measured it, on your phone.

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Sources. Storm tracks and events from NOAA's best-track archives, exactly as the Hurricane Calendar app shows them. Dates are calendar dates in UTC. Each wind speed keeps the agency that recorded it and its averaging period; nothing is converted between agencies. A missing value is shown as not recorded, never as zero. Storms that may still have been active when the archive was updated are left out.