Template:Tropical cyclone numbering/testcases

Numbering (desktop)
Almost all tropical and subtropical cyclones, even if not developed enough to be formally assigned names, are assigned numbers by the warning centers tasked with monitoring them.

For example, systems (tropical, subtropical, or even potential tropical) forming in the North Atlantic and North Pacific basins (in an official manner), as well as those originating in other areas (in an unofficial basis) serving United States government interests (both civilian and military), are assigned tropical cyclone numbers (or TC numbers for short) by the National Hurricane Center, the Central Pacific Hurricane Center, and the Joint Typhoon Warning Center. A TC number is a two-digit number (starting each year/season with "01" and running upwards) followed by (except for the North Atlantic basin) a suffix letter corresponding to the basin of origin (like "E" for Eastern Pacific, "C" for Central Pacific, and "W" for Western Pacific); the number is often spelled-out in English (like "ONE", sometimes appended with a hyphen and the basin suffix as in "ONE-E") for the purpose of generating a placeholder name for a (sub)tropical depression or an otherwise yet-unnamed storm (especially in JTWC-tracked areas where differences in wind scales result in one agency upgrading the system to a storm without the other following suit).

Examples of TC numbers are PTC 08 for a North Atlantic potential tropical cyclone EIGHT, TD 21E for an East Pacific tropical depression TWENTYONE-E, and SD 03C for a Central Pacific subtropical depression THREE-C. TC numbers are hard-limited to a maximum of "49" by the Automated Tropical Cyclone Forecasting System; however, the NHC and the CPHC usually limit this to "30"; also, TC numbers are not recycled until the next year/season. This numbering system is similar to that used for invests, except invests are numbered from "90" to "99" (which are rotated and recycled within the same year/season) and explicitly specify suffix "L" for North Atlantic systems.