Tropical Weather Discussion
Issued by NWS
Issued by NWS
892 AXPQ20 PGUM 060120 TWDPQ Tropical Weather Discussion National Weather Service Tiyan GU 1120 AM ChST Sun Apr 6 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 (NET) crosses southern Mindanao then enters Micronesia at a weak circulation near 3N130E to end at the equator near 132E. Convergence near and east of the NET is causing scattered showers and isolated thunderstorms in the Republic of Palau south of Tobi and Helen`s Reef (Hatohobei), which includes some of the far northern islands of Indonesia. The NET is expected to be pushed westward with little change of intensity, but this westward movement would likely have it exiting Micronesia. TRADE-WIND TROUGHS... A sharp trade-wind trough runs from the above weak circulation through 10N134E to end at 17N139E. Convergence east of the trough is creating scattered showers and isolated thunderstorms in western Yap state, including Yap Island. A series of weak trade-wind troughs is over eastern Yap State, Chuuk State, and Pohnpei State. These troughs are generating scattered showers and a few thunderstorms over the affected states, including Chuuk Lagoon and Pohnpei Island. These troughs are forecast to progress westward with little change of intensity. UPPER-LEVEL TROUGH... An upper-level trough stretches from 30N170W (which is why it doesn`t seem to be a true TUTT) to enter Micronesia near 25N180 to 17N170E to 12N150E. Upper-level divergence southeast of the trough is producing scattered showers and isolated thunderstorms in the northeastern Republic of the Marshall Islands, east of Bikini Atoll and Wake Island. This trough is expected to show little change of location or intensity. TRADE-WIND SURGE... A trade-wind surge is located in the far northern Marshall Islands, from 15N to 23N between 164E and 180, including Wake Island. This surge is making patchy showers and elevated sea heights, but has diminished in the past 24 hours. The surge is expected to show little change in position with a continued weakening trend, and could dissipated by Monday. OTHER SYSTEMS... A shear line reaches from 25N154E to 18N138E. Low-level clouds and patchy showers are seen along and up to 200 miles north of this boundary, or north of the Marianas. This feature is expected to weaken with little change in position. A mid-latitude trough arcs from 22N130E to 25N138E. Low-level clouds and patchy showers are found well north of Yap State and the Republic of Palau. This feature is forecast to show little change in position or intensity through Monday. $$ Stanko