Storm surge values associated with Harvey as a tropical storm occurred from August 28-30 th, and ranged from 4-5 feet Mean Lower Low Water (MLLW) along the Southeast Texas to Central Louisiana coast. The cyclone dissipated over northern Kentucky late the next day. Harvey then moved northeastward over the southern United States while producing heavy rainfall, and it transformed into an extratropical cyclone by September 1 st over the Tennessee Valley. Harvey slowly weakened over land, becoming a tropical depression over Central Louisiana by the evening of August 30 th. CDT on August 30 th near Cameron with maximum sustained winds of 45 mph (40 knots) and a minimum central pressure of 991 millibars (29.26 inches). Harvey made its final landfall in Southwestern Louisiana at 3 A.M. However, the vertical wind shear was too strong for much intensification, and Harvey reached a final peak intensity of 50 mph (45 knots) late on August 29th. Harvey’s sustained winds strengthened slightly while over the coastal waters just off the Southeast Texas coast on August 28-29 th. The storm made a slow loop late on August 26-27 th, drifted eastward, then southeastward before re-emerging over Matagorda Bay late on August 27 th and the Gulf of Mexico early on August 28 th. The steady northwestward motion of the cyclone stopped by the afternoon of August 26 th as Harvey became embedded in light steering currents between two mid-tropospheric highs over the Southwestern United States and over the northern Gulf of Mexico. Harvey weakened over land to a tropical storm within 12 hours after landfall and maintained a 40 mph (35 knots) intensity the next couple of days, aided by the sustaining effects of the southeastern portion of its circulation remaining over water. CDT on August 26 th with maximum sustained winds of 120 mph (105 knots) and an minimum central pressure of 948 millibars (27.99 inches). The hurricane then made a second landfall on the Texas mainland southeast of Refugio on the northeast coast of Copano Bay west of Holiday Beach at 1 A.M. CDT on August 25 th as a category 4 hurricane with sustained winds of 130 mph (115 knots) and a minimum central pressure of 937 millibars (27.67 inches). Harvey made landfall on the northern end of San Jose Island about 5 miles east of Rockport, Texas at 10 P.M. Harvey continued to rapidly intensify, reaching category 3 status by midday on August 25 th, and category 4 shortly before sunset that evening. Harvey continued to strengthen the next 24 hours, reaching hurricane status by the afternoon of August 24 th. Harvey quickly regained tropical storm status by that afternoon as the system became much better organized.
The remnants of Harvey crossed the central and western Caribbean Sea August 19 th through the 21 st, the Yucatan Peninsula on August 22 nd, and reformed as a tropical depression over the Bay of Campeche by daybreak on August 23 rd. Harvey began as a weak tropical storm on August 17 th, affected the Lesser Antilles on August 18 th, and degenerated to an open tropical wave over the central Caribbean Sea on August 19th. Above: GOES 16 GeoColor Satellite Image of Hurricane Harvey at 22:32 UTC (5:32 CDT) on August 25, 2017.
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