Tropical Weather Discussion
Issued by NWS
Issued by NWS
582 AXPQ20 PGUM 050049 TWDPQ Tropical Weather Discussion National Weather Service Tiyan GU 1049 AM ChST Fri Dec 5 2025 Tropical Weather Discussion for the Western North Pacific between the Equator and 25N from 130E to 180. The following information is based on recent satellite imagery/data, weather observations, radar, and meteorological analysis. ...SPECIAL FEATURES... None. ...OTHER WEATHER SYSTEMS... NEAR EQUATORIAL TROUGH... The NET is currently broken in two parts. The first begins near 6N145E and meets the equator at 152E. The second portion of the NET begins at 6N131E and meets the equator at 133E. Both features are producing scattered to numerous showers and isolated to scattered thunderstorms along the trough axis. Both sides of the NET are expected merge over the coming days with the NET becoming the main weather feature near the equator this weekend. TRADE-WIND TROUGHS... There are two trade-wind troughs across the region. The first is located east of Kosrae, extending from 7N165E to 2N168E. Isolated to scattered showers are seen along the trough axis. This trough will move southwestward as it weakens over the coming days. The second trough is located just west of Guam extending from 15N144E to 13N143E. Scattered showers and isolated thunderstorms are seen along this trough axis. This trough will weaken over the next day or two as it continues to move westward. TRADE-WIND SURGE... A trade-wind surge is seen just north of the Marshall Islands from 12N to 25N and 165E to 180. This surge looks to move into the Marshall Islands tonight and into Kosrae and Pohnpei on Saturday as the winds slowly decrease over time. OTHER SYSTEMS... A cold-front enters are region at 25N154E and stretches southwestward where it started to decay near 22N147E. The cold-front then transitions into a shear line at 20N140E to where it exits our region at 15N130E. A trough extending northeastward from Invest 93W, which exited our region over night, is interacting with the cold- front and shear line to produce numerous showers and isolated to scattered thunderstorms. The cold-front is expected to weaken and transition into a shear line in the next couple of days. $$ Williams