A low pressure system designated as Subtropical Depression 01 made a tropical transition to Tropical Depression 01 on Thursday morning.\u00a0 At 11:00 a.m. EDT the center of Tropical Depression 01 was located at latitude 36.1\u00b0N and longitude 40.0\u00b0W which put it about 730 miles (1170 km) west of the Azores.\u00a0 The tropical depression was moving toward the northwest at 14 m.p.h. (22 km\/h).\u00a0 The maximum sustained wind speed was 35 m.p.h. (55 km\/h) and there were wind gusts to 45 m.p.h. (75 km\/h).\u00a0 The minimum surface pressure was 996 mb.<\/p>\n
A circular ring of showers and thunderstorms developed around the center of circulation of Subtropical Depression 01.\u00a0 Additional narrow rainbands organized around the core of the circulation and the convection assumed a more circularly symmetrical shape.\u00a0 In addition data from satellites indicated that a weak warm core had formed at the top of the circulation.\u00a0 A more circular shape and a warm core are characteristics of a tropical cyclone and the National Hurricane Center changed the classification of Subtropical Depression 01 to Tropical Depression 01 in the 11:00 a.m. EDT advisory on Thursday.<\/p>\n
Tropical Depression 01 is in an environment that would not normally be considered favorable for a purely tropical weather system.\u00a0 It is moving over water where the Sea Surface Temperature (SST) is near 19\u00b0C.\u00a0 However, an upper low just to the west of the depression contains colder air.\u00a0 Colder air in the upper levels is providing sufficient instability to generate showers and thunderstorms even though the SST is relatively cool.\u00a0 The cooler SST does mean that the showers and thunderstorms are not as tall as they would be if the water was warmer.\u00a0 The upper low west of the system is producing southerly winds which are blowing over the top of the depression.\u00a0 However, since the thunderstorms are not as tall, some of the stronger upper level winds are blowing over the top of the depression’s circulation and the vertical wind shear is not having as much of an effect as might be expected.<\/p>\n
The environment is marginal for further intensification, but the circulation looks fairly intact at the current time.\u00a0 The cool SST is limiting the amount of energy that the tropical depression can extract from the ocean.\u00a0 However, since the vertical wind shear is not having as much of a negative impact on the depression, some intensification may be possible during the next 24 hours.\u00a0 If the depression intensifies into a tropical storm, then it would be named Arlene.\u00a0 Eventually, the wind shear is forecast to increase and the depression is forecast to weaken.<\/p>\n
Tropical Depression 01 is caught in the circulation of a large low pressure system to its west.\u00a0 Tropical Depression is forecast to make a slow counterclockwise loop as it moves around the circulation of the larger low pressure system.\u00a0 It is possible that the larger low could absorb the circulation of Tropical Depression 01.<\/p>\n","protected":false},"excerpt":{"rendered":"
A low pressure system designated as Subtropical Depression 01 made a tropical transition to Tropical Depression 01 on Thursday morning.\u00a0 At 11:00 a.m. EDT the center of Tropical Depression 01 was located at latitude 36.1\u00b0N and longitude 40.0\u00b0W which put it about 730 miles (1170 km) west of the Azores.\u00a0 The tropical depression was moving […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,2],"tags":[316,317,661,31,662,322,663],"_links":{"self":[{"href":"https:\/\/jayhobgood.com\/index.php?rest_route=\/wp\/v2\/posts\/3866"}],"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=3866"}],"version-history":[{"count":1,"href":"https:\/\/jayhobgood.com\/index.php?rest_route=\/wp\/v2\/posts\/3866\/revisions"}],"predecessor-version":[{"id":3867,"href":"https:\/\/jayhobgood.com\/index.php?rest_route=\/wp\/v2\/posts\/3866\/revisions\/3867"}],"wp:attachment":[{"href":"https:\/\/jayhobgood.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3866"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jayhobgood.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3866"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jayhobgood.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3866"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}