The agency quickly downgraded the storm to tropical depression status, but briefly re-upgraded it on January 19 as the system crossed over the extreme western Mozambique Channel.
On March 16, the JTWC initiated advisories on the system as Tropical Cyclone 28S, briefly upgrading it to tropical storm status on the next day.
Although the depression was nearly at tropical storm intensity, the NHC held off on upgrading it due to its proximity to Tropical Depression Five-E.
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After its formation, the depression gradually became better organized; the NHC upgraded it to Tropical Storm Lenny on November 14, based on reports from the Hurricane Hunters.
After further intensification, Sinlaku strengthened, and the JMA upgraded it to a typhoon on August 31; the JTWC estimated Sinlaku attained typhoon status a day earlier.
After the storm developed a large eye feature, the JTWC upgraded it to typhoon status on September 27, although the JMA did not follow suit until the following day while near Chichi-jima.
Based on satellite intensity estimates, the NHC upgraded it to Tropical Storm Danny on September 8.
With warm water temperatures, it gradually intensified while moving east-southeastward, and MFR upgraded it to Tropical Storm Elizabetha on February 24.
