Disturbance 19 Advisory #10<span-family:"Arial","sans-serif";color:#001277">
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Valid: 10:00 AM EDT Friday August 22, 2014
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Current Position: <span-family:"Arial","sans-serif"">18.4N, 65.7W
Geographical Reference: 22 NM east of San Juan, Puerto Rico
Movement: West-northwest at 21 kts
Organization Trend: Steady
Chance of Development Within 48 Hours: 70 percent
Chance of Development Within 7 Days: 85 percent
Peak Forecast Radius of Tropical Storm Force Winds: 110 NM
Forecast Confidence: Low
<span-family:"Arial","sans-serif"">Changes From Our Previous Forecast
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No significant changes.
Our Forecast <span-family:"Arial","sans-serif"">
There has been little change over the past 6 hours other than squalls near the center decreasing. There are still no west winds south of the center, indicating this system is an open wave without a defined center of circulation. Due to the current poor organization
and interaction with the rugged terrain of Hispaniola, we do not expect it to develop within the next 24 hours. It could become a tropical depression late tomorrow or early Sunday, as it moves through the Turks and Caicos Islands. By Sunday or Monday, it could
become a tropical storm in the vicinity of the Bahamas.
<span-family:"Arial","sans-serif"">We are confident in the forecast through the first 48 hours. Thereafter, the track forecast remains low confidence. A trough over the western Atlantic Ocean is likely to cause the system to turn northward on
Monday. However, there is a slight chance that the trough could pass without carrying Disturbance 19 out to sea. There is an 80 percent chance that it will move out to sea without affecting the southeast coast of the United States. It is possible that the
disturbance could come close enough to Florida or North Carolina next Tuesday or Wednesday to produce impacts onshore. We think that there is only about a 5 percent chance of this system entering the extreme eastern Gulf of Mexico. The eventual track is largely
dependent on whether the trough picks it up and carries it out to sea. Of the four primary global models, only the Canadian takes this system into the Gulf of Mexico. The American, European and U.S. Navy models take it northward and out to sea well east of
the Florida Peninsula.
<span-family:"Arial","sans-serif"">Most of the tropical cyclone track models remain in good agreement as far as the eventual intensity of the disturbance. Many models are indicating that the system should be a strengthening tropical storm as
it moves near the Bahamas on Monday, and some models indicate it could become a hurricane by Tuesday. We think it is very likely to become at least a tropical storm. We think that conditions will be quite favorable for strengthening in the Bahamas, and we
think it has about a 35 percent chance of being a hurricane on Tuesday or Wednesday.
<span-family:"Arial","sans-serif"">Expected Impacts on land
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Windward, Leeward and Virgin Islands: Heavy rains continue to affect parts of the Lesser Antilles. Gusts to tropical storm force are possible over the next 12 to 18 hours, along with localized flooding.
<span-family:"Arial","sans-serif"">Puerto Rico and Hispaniola:
<span-family:"Arial","sans-serif"">Heavy rain and flooding are likely for Puerto Rico through Saturday morning, and Hispaniola through early Sunday morning. Wind gusts to tropical storm force are possible.
Bahamas: <span-family:"Arial","sans-serif"">Tropical storm conditions are possible Sunday through early Tuesday. If the center were to track directly over the Bahamas, then tropical
storm conditions would be expected.
<span-family:"Arial","sans-serif"">Expected impacts Offshore
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East Caribbean: Scattered squalls are currently moving through the northeastern Caribbean Sea. Although sustained winds are remaining below tropical storm force, gusts to tropical storm force are possible
NW Bahamas area: <span-family:"Arial","sans-serif"">Sunday through Tuesday, tropical storm force winds are likely within 85 NM of the center.
<span-family:"Arial","sans-serif"">Our next advisory will be issued by 4 PM AST (3 PM CDT).
<span-family:"Arial","sans-serif"">Meteorologists: Jim Palmer / Chris Hebert
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<span-family:"Arial","sans-serif"">Lat.
<span-family:"Arial","sans-serif"">Lon.
<span-family:"Arial","sans-serif"">Max Sustained Winds
<span-family:"Arial","sans-serif"">Category
<span-family:"Arial","sans-serif"">18.40N
<span-family:"Arial","sans-serif"">65.70W
<span-family:"Arial","sans-serif"">30 kts
<span-family:"Arial","sans-serif"">Tropical Disturbance
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<span-family:"Arial","sans-serif"">© 2014 ImpactWeather, Inc. All rights reserved.
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