Tropical Weather Discussion
Issued by NWS
Issued by NWS
862 AXPQ20 PGUM 170027 TWDPQ Tropical Weather Discussion National Weather Service Tiyan GU 1027 AM ChST Thu Apr 17 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... A near-equatorial trough runs from 4N130E to EQ142E. Scattered showers and a few thunderstorms are found in far southern portions of the Republic of Palau and Yap State, mainly in the islands of Tobi and Helen`s Reef (Hatohobei). This feature is expected to show little change of location or intensity through Saturday, however extended models do continue to intensify it later while morphing it into an actual monsoon trough. TRADE-WIND TROUGHS... A trade-wind trough stretches from 5N134E to 14N130E. Scattered showers and a few thunderstorms are seen in the central Republic of Palau south and west of Koror. This feature is forecast to move westward with little change of intensity, and will exit Micronesia by Saturday. Another trade-wind trough extends from 1N148E to 15N143E. Scattered showers and a few thunderstorms are observed in far southwestern Chuuk State, north central Yap State, and near and west of the Marianas. This trough is forecast to move westward with little change of intensity, and could affect Yap Island or Koror Palau around Saturday. A third trade-wind trough curves from 4N180 to 17N170E. Scattered showers are found in the Marshall Islands east and north of Majuro. This trough will move westward with little change of intensity and could affect Kosrae by Saturday. OTHER SYSTEMS... A shear line cuts from 25N152E to 18N130E. Extensive low to mid-level clouds and patchy showers are noted along and up to 300 miles north of this boundary. This is just north of the far northern Marianas. This shear line is forecast to weaken with little change of location through Saturday. $$ Stanko