By PDC’s Senior Weather
Specialist Glenn James
Tropical Cyclone 21W…is located approximately 642 NM northwest of Wake Island – Final Warning
Tropical Cyclone 22W (Sonca)…is located approximately 54 NM southeast of Da Nang, Vietnam – Final Warning
Tropical Cyclone 23W…is located approximately 455 NM northeast of Manila, Philippines
Northeast Pacific Ocean:
There are no tropical cyclones nor any areas of disturbed weather under investigation by the NHC
There are no tropical cyclones nor any areas of disturbed weather under investigation by the CPHC
Northwest and Southwest Pacific Ocean, Indian Ocean, Arabian Sea:
Northwest Pacific Ocean
Tropical Cyclone 21W – Final Warning
According to the JTWC Warning number 10A, sustained winds were 40 knots with gusts to near 50 knots.
Tropical Storm 21W is embedded under strong southerly flow within the eastern periphery of a broad, subtropical upper-level low. Consequently, environmental conditions are marginal with low to moderate vertical wind shear offset by robust poleward outflow.
Animated multi-spectral satellite imagery depicts a small, well-defined low-level circulation (llc) accelerating poleward with flaring deep convection over the llc. A color composite microwave image shows fragmented convective banding over the eastern and northern quadrants of the small system.
TS 21W is forecast to track northward to north-northeastward through 24 hours along the western periphery of the ridge.
Environmental conditions will remain marginal as the system tracks within the eastern periphery of the upper-level subtropical low with robust poleward outflow offset by dry air entrainment and moderate vertical wind shear. Gradual weakening is anticipated with dissipation expected by 24 hours.
Tropical Cyclone 22W (Sonca) – Final Warning
According to the JTWC Warning number 4, sustained winds were 35 knots with gusts to near 45 knots.
Animated enhanced infrared satellite imagery depicts an exposed, defined low-level circulation (llc) with deep convection sheared to the west due to moderate to strong easterly vertical wind shear. A color composite microwave image reveals shallow banding wrapping tightly into an elongated llc with disorganized deep convection over the western semicircle.
TS 22W is forecast to track west-northwestward to westward through 12 hours with landfall occurring within the next 12 hours. After 12 hours, the system will turn west-southwestward and weaken rapidly with dissipation expected by 24 hours.
Tropical Cyclone 23W
According to the JTWC Warning number 1, sustained winds were 25 knots with gusts to near 35 knots.