Tropical Weather Discussion
Issued by NWS
Issued by NWS
582 AXPQ20 PGUM 210044 TWDPQ Tropical Weather Discussion National Weather Service Tiyan GU 1044 AM ChST Fri Mar 21 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 Near Equatorial Trough has drifted farther west and is no longer in the area. TRADE-WIND TROUGHS... Several weak trade-wind troughs are present across the region, though most are responsible for little to no convection. One trough, however, is evident over western Micronesia, extending south- southwest from near 11N137E, across Palau, to end near EQ130E. This trough is producing scattered showers across Yap Proper and Palau. The trough is expected to continue to move west, crossing 130E and moving out of the area by late tonight. Another trade-wind trough has developed into a broad, weak circulation with a couple of possible centers near 5N145E and near 4N148E. A broad area of convergence is seen on the latest surface analysis stretching east-southeastward from the circulations to end near 2N159E. Convection in the form of numerous showers is seen on satellite in a band as wide as 400 miles across eastern Yap State to south of Chuuk and Pohnpei. Latest guidance shows weak circulation centers popping up from time to time across the area as the convergence band drifts westward. Little change in convection is expected. TRADE-WIND SURGE... A weakening trade-wind surge is seen on the latest ASCAT analysis across the Marshall Islands. This surge is producing moderate to fresh winds with strong gusts from the far western Marshall Islands eastward to across the Date Line. This surge will continue to shift east and weaken as the mid-latitude high pressure system responsible for producing it continues to move east. Winds and seas look to diminish through the afternoon as the surge drifts east. OTHER SYSTEMS... A quasi-stationary front enter the region near 25N159E, extending west-southwest to the extreme northern CNMI near 21N145E, then continues southwest as a shear line to beyond 130E near 12N. Cloudiness with patchy rain and showers is seen up to 270 miles northwest of the front and up to 340 miles northwest of the shear line. These features look to remain quasi-stationary with the shear line slowly weakening. The stationary front will gradually transition into a shear line. Cloudiness and showers will decrease from the southwest as the features weaken. $$ Kleeschulte