Tropical Weather Discussion
Issued by NWS
Issued by NWS
243 AXPQ20 PGUM 200053 TWDPQ Tropical Weather Discussion National Weather Service Tiyan GU 1053 AM ChST Thu Jun 20 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... MONSOON TROUGH... A monsoon trough enters the region 10N130E, extending southeastward across Palau to end just south of Ngulu. Moderate convection is associated with this feature, producing scattered showers and some thunderstorms near the point of maximum momenta at 10N130E, and in a convergence zone northwest of Yap. The monsoon trough, being a result of a former tropical disturbance degrading into an open wave, is expected to shift northwestward towards the Philippines and allow a ridge to move in tonight. DIRTY RIDGE... A dirty ridge hugs the eastern peripheries of the aforementioned monsoon trough, extending from Helen`s Reef in southern Palau, east- northeastward to end south of Sorol in eastern Yap State. Vast cloudiness is observed across the entirety of the ridge, with some convection spawning at the buckling point with the incoming trades near Sorol in eastern Yap State. As mentioned above, this ridge will follow the monsoon trough closely and weaken through today, before becoming indiscernible by tonight. TRADE-WIND TROUGHS... The troughs are difficult to distinguish from the background trade- wind pattern across Micronesia, being generally short-lived in nature. The most distinguishable features are producing some showers, thunderstorms and gusty outflow boundaries across much of eastern Yap State, northwest of Pohnpei, and south of the Marshalls. TUTT... A Tropical Upper-Tropospheric Trough (TUTT) cell is centered near 18N173E well east of Wake Island. Little convection is associated with this feature, producing a few thunderstorms near the center. The TUTT will continue to shift westward, crossing Wake Island by the weekend and head in the general direction of the northern Marianas in the first half of next week. $$ Montvila