NHC Atlantic Outlook

ZCZC MIATWOAT ALL TTAA00 KNHC DDHHMM Tropical Weather Outlook NWS National Hurricane Center Miami FL 200 AM EDT Mon Aug 21 2017 For the North Atlantic...Caribbean Sea and the Gulf of Mexico: 1. A trough of low pressure, associated with the remnants of Harvey, is producing a large area of cloudiness and disorganized thunderstorms over the west-central Caribbean Sea. Some development of this system is still possible before it reaches the coast of Belize or the Yucatan Peninsula early Tuesday. The disturbance is forecast to move into the Bay of Campeche early Wednesday, where environmental conditions are expected to be more conducive for redevelopment. Regardless of development, locally heavy rainfall and gusty winds are likely to spread westward across northern Nicaragua, Honduras, Belize, and the Yucatan Peninsula during the next couple of days. * Formation chance through 48 hours...medium...50 percent. * Formation chance through 5 days...high...80 percent. 2. A trough of low pressure located a couple of hundred miles north-northeast of the southeastern Bahamas is producing disorganized showers and thunderstorms that extend southeastward toward Puerto Rico. Environmental conditions are expected to be unfavorable for development of this system during the next day or so while it moves west-northwestward at about 15 mph toward the northern Bahamas and southern Florida. Conditions could become a little more conducive for development later in the week when the system is near Florida or the adjacent waters of the western Atlantic or eastern Gulf of Mexico. * Formation chance through 48 hours...low...10 percent. * Formation chance through 5 days...medium...40 percent. 3. A large area of cloudiness and disorganized thunderstorms located about 900 miles east-northeast of the northern Leeward Islands is associated with a surface trough that is interacting with a large upper-level low over the central Atlantic. Upper-level winds are not conducive for development of this system while it moves northwestward over the central Atlantic at 10 to 15 mph. * Formation chance through 48 hours...low...near 0 percent. * Formation chance through 5 days...low...near 0 percent. Forecaster Brown
Original author: NHC
NHC Eastern North Pacific Outlook
NHC Eastern North Pacific Outlook

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