Tropical Storm Son-tinh made landfall in Vietnam on Wednesday while Tropical Storm Ampil formed south of Okinawa.\u00a0 At 5:00 p.m. EDT on Saturday the center of Tropical Storm Son-tinh was located at latitude 19.1\u00b0N and longitude 105.5\u00b0E which put it about 30 miles (50 km) north-northwest of Vinh, Vietnam.\u00a0 Son-tinh was moving toward the west at 14 m.p.h. (22 km\/h).\u00a0 The maximum sustained wind speed was 50 m.p.h. (80 km\/h) and there were wind gusts to 65 m.p.h. (105 km\/h).\u00a0 The minimum surface pressure was 990 mb.<\/p>\n
Tropical Storm Son-tinh strengthened on Wednesday after it moved away from Hainan Island.\u00a0 A primary rainband wrapped around the western and southern side of the center of circulation and the inner end of the band began to evolve into a partial eyewall.\u00a0 Thunderstorms in the core of Son-tinh generated upper level divergence which pumped away mass.\u00a0 The removal of mass allowed the surface pressure to decrease.\u00a0 A stronger pressure gradient force produced higher wind speeds.<\/p>\n
Tropical Storm Son-tinh moved south of a ridge in the upper and middle troposphere.\u00a0 The ridge steered Son-tinh steadily toward the west and the tropical storm made landfall just north of Vinh, Vietnam late on Wednesday.\u00a0 Tropical Storm Son-tinh brought gusty winds and locally heavy rain to the coast of northern Vietnam around Vinh.\u00a0 Son-tinh was also dropping locally heavy rain over portions of northern Vietnam and flash flooding could occur in some locations.<\/p>\n
Tropical Storm Son-tinh will continue to move westward over northern Vietnam and northern Laos.\u00a0 Son-tinh will weaken as the circulation moves inland.\u00a0 It will continue to drop locally heavy rain and flash floods could occur in parts of northern Vietnam and northern Laos during the next several days.<\/p>\n
The organization of former Tropical Depression 12W improved on Wednesday and the Japan Meteorological Agency designated the system as Tropical Storm Ampil.\u00a0 At 5:00 p.m. EDT on Wednesday the center of Tropical Storm Ampil was located at latitude 19.9\u00b0N and longitude 129.6\u00b0E which put it about 480 miles (775 km) south-southeast of Okinawa.\u00a0 Ampil was moving toward the east-northeast at 8 m.p.h. (13 km\/h).\u00a0 The maximum sustained wind speed was 40 m.p.h. (65 km\/h) and there were wind gusts to 50 m.p.h. (80 km\/h).\u00a0 The minimum surface pressure was 996 mb.<\/p>\n
The circulation of Tropical Storm Ampil was not particularly well organized.\u00a0 It exhibited characteristics of a hybrid low pressure system.\u00a0 There was an upper low northwest of the low level circulation.\u00a0 The upper low was causing strong southwesterly winds which were blowing across the top of the lower level circulation.\u00a0 Those winds were causing significant vertical wind shear and they were tilting the circulation strongly toward the northeast.\u00a0 The strongest bands of showers and thunderstorms were occurring south and west of the low level circulation.\u00a0 Bands north and west of the center consisted primarily of showers and lower clouds.<\/p>\n
The upper low will gradually move toward the west.\u00a0 As the low moves westward, the vertical wind shear over Tropical Storm Ampil will start to decrease.\u00a0 Ampil will move over water where the Sea Surface Temperature is near 29\u00b0C.\u00a0 So, when the vertical wind shear decreases, then Tropical Storm Ampil will likely intensify.\u00a0 Ampil could eventually strengthen into a typhoon in two or three days.<\/p>\n
The upper low will initially will steer Tropical Storm Ampil toward the northeast.\u00a0 When the upper low moves farther to the west on Thursday, then Ampil will move toward the north.\u00a0 On its anticipated track the center of Tropical Storm Ampil could be near Okinawa and the Ryukyu Islands in two or three days.<\/p>\n","protected":false},"excerpt":{"rendered":"
Tropical Storm Son-tinh made landfall in Vietnam on Wednesday while Tropical Storm Ampil formed south of Okinawa.\u00a0 At 5:00 p.m. EDT on Saturday the center of Tropical Storm Son-tinh was located at latitude 19.1\u00b0N and longitude 105.5\u00b0E which put it about 30 miles (50 km) north-northwest of Vinh, Vietnam.\u00a0 Son-tinh was moving toward the west […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,5],"tags":[466,476,1091,43,468,44,173,46,1092,1087,130,42,174,816,1090,1086,63,467,478],"_links":{"self":[{"href":"https:\/\/jayhobgood.com\/index.php?rest_route=\/wp\/v2\/posts\/6219"}],"collection":[{"href":"https:\/\/jayhobgood.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jayhobgood.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jayhobgood.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jayhobgood.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=6219"}],"version-history":[{"count":1,"href":"https:\/\/jayhobgood.com\/index.php?rest_route=\/wp\/v2\/posts\/6219\/revisions"}],"predecessor-version":[{"id":6220,"href":"https:\/\/jayhobgood.com\/index.php?rest_route=\/wp\/v2\/posts\/6219\/revisions\/6220"}],"wp:attachment":[{"href":"https:\/\/jayhobgood.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=6219"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jayhobgood.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=6219"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jayhobgood.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=6219"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}