Tropical Weather Discussion
Issued by NWS
Issued by NWS
072 AXPQ20 PGUM 290056 TWDPQ Tropical Weather Discussion National Weather Service Tiyan GU 1056 AM ChST Sat Jun 29 2024 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) enters the region near 5N130E, extending northeast across Sonsorol and Palau, to then end over Yap Proper. Moderate convection is associated with this feature, producing patches of showers and thunderstorms in a wide region from the Equator to Yap, between 130E and Eauripik. Another broad trough extends from said feature to the east-northeast across Satawal, but little to no convection is associated with this feature. The NET is expected to shift to the northwest across the Philippines, degrading an embedded disturbance even moreso under topographical friction there, allowing doldrums to form across western Micronesia by Monday. TUTT... A Tropical Upper-Tropospheric Trough (TUTT) enters the region near 25N180, to then extend southwest to a TUTT cell near 20N172E east of Wake Island, then extending further southwest into the northern Marshalls. Moderate convection is associated with this feature, producing scattered to widespread thunderstorms within 250 miles of the center of the aforementioned TUTT cell near Wake Island, and also interacting with surface features that allow thunderstorms to form within the previously mentioned east-west oriented convective axis well east of Kwajalein. The TUTT is expected to begin degrading over the next few days, as it starts to shift away from the region and the embedded TUTT cell dissipates by Monday. UPPER-LOW... A former TUTT cell is centered near 19N143E west-northwest of Alamagan. This feature is interacting with surface features to produce widespread thunderstorms along and within the northern peripheries southeast of Iwo-To, and some showers and thunderstorms over the coastal waters of Guam, Rota, Tinian and Saipan. This low is expected to continue drifting west, before dissipating in the first half of next week. ...ITCZ-LIKE CONVERGENCE ZONE & ASSOCIATED TRADE-WIND TROUGHS... The trade-wind troughs are concentrated mainly within an ITCZ-like convergence zone in eastern Micronesia. These features are bringing showers and some thunderstorms across the southern Marshalls, and also widespread showers and thunderstorms within 200 miles of an east-west oriented convective axis near the Date Line well east of Kwajalein. A few other minor surface troughs are producing some showers and an occasional thunderstorms near and well south of Pohnpei. These features are expected to move along with the trades, before losing their convective vigor by Monday. $$ Montvila