Invests are numbered from 90 to 99, followed by a suffix letter “ L ” in the North Atlantic basin, “ e ” and “ C ” in the Eastern and Central Pacific basins ( respectively ), or “ watt ” in the Western Pacific basin. [ 2 ]
The Joint Typhoon Warning Center besides issues unofficial warnings for U.S. government interests ( predominantly military ) in the Southern Hemisphere, designating tropical invests with the “ S ” suffix when they form west of 135°E ( this spans the whole South indian Ocean, including the South-Western indian Ocean river basin and the western half of the Australian-region washbasin ), and the “ P ” suffix when they form east of 135°E ( spans both the easterly half of the australian region and the South Pacific washbasin ). In addition, invests in the North indian Ocean cyclone basin are besides labelled by the JTWC, and are suffixed with “ A ” if they form in the Arabian Sea and with “ B ” if they form in the Bay of Bengal.
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The Naval Research Laboratory ‘s Marine Meteorology Division besides uses the “ Q ” suffix to designate invests which form in the South Atlantic Ocean, [ 3 ] [ 4 ] even though it is not recognized as an official tropical cyclone basin by the World Meteorological Organization. These suffix letters ( with the common exception of “ L ” ) are besides used with the tropical cyclone numbers ( TC numbers for brusque ) assigned to tropical and subtropical depressions ( and electric potential tropical cyclones ) monitored by the NHC & CPHC ( North Atlantic systems are normally designated by TC numbers without a suffix letter ; the “ L ” is still used, however, by the NRL for this basin ) and all tropical, subtropical, and electric potential tropical cyclones tracked by the JTWC. [ 5 ]
Numbers are rotated within the season and are re-used as necessity ( the future invest after 99 would be numbered 90 ). In line, TC numbers start each year/season with 01 and run upwards, normally up to 30 in NHC and CPHC-monitored basins. [ 6 ] The hard-coded limit imposed by the Automated Tropical Cyclone Forecasting System is 49. TC numbers assigned to proper cyclones ( tropical, subtropical, and potential tropical ) are not recycled until the comply year/season. If the endow system develops into a ( submarine ) tropical cyclone, it is reclassified as the following name/number on the tilt. This is a TC number if evolving into a low or JTWC cyclone ; or a name if evolving cursorily into a tropical or subtropical storm, bypassing the low stage ). The NHC besides numbers cyclones based on previous seasons .
- Navy/NRL Tropical Cyclone Page – Current tropical cyclones and INVESTS worldwide