By PDC’s Senior Weather
Specialist Glenn James
The Pacific Disaster Center’s (PDC Global) Sunday, December 17, 2023, Tropical Cyclone Activity Report…for the Pacific Ocean, the Indian Ocean, and adjacent Seas
Current Tropical Cyclones:
Tropical Storm 18W (Jelawat)…is located approximately 60 NM east of Davao City, Philippines
Northeast Pacific Ocean:
The North Pacific hurricane season officially ended on November 30, 2023. Routine issuance of the Tropical Weather Outlook will resume on May 15, 2024. During the off-season, Special Tropical Weather Outlooks will be issued as conditions warrant.
The eastern Pacific basin hurricane season was above normal, with 17 named storms, of which 10 were hurricanes and eight of those major hurricanes.
From August 16 to 21, Tropical Storm Hilary brought widespread heavy rainfall and flooding to Southern California, with some areas receiving up to 600% of their normal August rainfall. Hilary resulted in the first ever issuance of Tropical Storm Watches and Warnings for the Southern California coastline by NOAA’s National Hurricane Center. In addition, the Center distributed key hazard focused messages for Hilary in Spanish through the agency’s new language translation project.
Hurricane Otis made landfall near Acapulco, Mexico, on October 25 as a category-5 hurricane, with sustained winds of 165 mph. Otis holds the record as the strongest landfalling hurricane in the eastern Pacific, after undergoing rapid intensification in which wind speeds increased by 115 mph in 24 hours.
Central North Pacific:
The central North Pacific hurricane season officially ended on November 30, 2023. Routine issuance of the Tropical Weather Outlook will resume on June 1, 2024. During the off-season, Special Tropical Weather Outlooks will be issued as conditions warrant.
The central Pacific basin had a near-normal season with four tropical systems traversing the basin.
Hurricane Dora, a category-4 storm, passed south of Hawaii in early August, marking the first major hurricane in the central Pacific basin since 2020. The strong gradient between a high pressure system to the north and Dora to the south was a contributing factor to the wind-driven, fast-moving wildfires in Hawaii.
Western Pacific, Indian Ocean and adjacent Seas:
Northwest Pacific Ocean…
Tropical Storm 18W (Jelawat)
According to the JTWC Warning number 5, sustained winds are 30 knots…with gusts to 40 knots.
This storm is expected to continue weakening over the next 36 hours.
TC Jelawat has tracked westward at 08 knots over the past six hours.
Maximum significant wave height is 17 feet.
~~~ An area of disturbed weather, being referred to as Invest 92W, is now under investigation by the JTWC…it’s located approximately 250 NM east-southeast of Kosrae.
Recent animated visible satellite imagery shows deep convection developing along the southern and eastern peripheries of a broad area of low-level troughing.
Environmental conditions are generally favorable, including low (10-15 knot) vertical wind shear, warm sea surface temperatures, and moderate eastward diffluence aloft.
Numerical models show a mixed picture for development and quasi-
stationary, meandering motion, with environmental conditions becoming a
bit less favorable over the next several days.
Maximum sustained surface winds are estimated at 15 to 20 knots.
The potential for the development of a significant tropical cyclone within the next 24 hours is low.