Tropical Storm Bulletin No. 6
Watch message No. 6, Date: Friday August 21, 2020 Time: 05:38 local time by KNMI for the Caribbean Netherlands.
Key Messages / Watches and warnings
- A Tropical Storm Watch is in effect for Tropical Depression 13 (expected to become a Tropical Storm by late Friday)
- TD 13 is expected to pass 68-74 miles (110-119 km) NNE of Saba/St Eustatius on Friday August 21 22:00 AST
- Heavy showers are likely to be the main concern. Accumulated rainfall 25-75 mm (1-3 inch), small risk up to 125 mm (5 inch).
- Due to the heavy showers flash floods and mudslides are possible
- There is a small chance of less than 10% of Tropical storm winds from late Friday till Saturday morning
- If TS conditions do occur 7-11 ft high waves are expected from late Friday into the night towards Saturday
Effect on local conditions
Winds:
There is a small chance of less than 10% of Tropical Storm Conditions from late Friday till early Saturday. Winds will come from a northeasterly direction on Friday evening, ending up from a south to southeasterly direction on Saturday. Outside this period normal conditions are expected.
Seas:
Significant wave heights of 3-5 ft are expected. In case of Tropical Storm Conditions significant wave heights may increase to 5-9 ft on Friday, to 7-11 ft in easterly- to northeasterly swell in the night towards Saturday, decreasing again to 5-7 ft on Sunday.
Rainfall:
The tropical cyclone is expected to produce heavy showers with 25-75 mm (1 to 3 inches) of rain with isolated maximum totals of 125 mm (5 inches) from Friday evening through Saturday. Flash floods and mudslides are possible.
Local authorities and residents of Saba and St. Eustatius are advised to continue monitoring the further progress of this weather system and to take all necessary measures to safeguard life and property.
Center's latest and forecast positions:
SABA:
Till Wed Aug 26 02:00 AST, the nearest position is estimated at:
Fri Aug 21 22:00 AST 18.6N 62.9W Tropical Depression 110 km (68 mi) NNE of Saba
Fri Aug 21 05:00 AST 17.8N 58.5W Tropical Depression 502 km (312 mi) E of Saba
Fri Aug 21 14:00 AST 18.1N 60.7W Tropical Depression 273 km (170 mi) E of Saba
Sat Aug 22 02:00 AST 18.8N 64.0W Tropical Storm 153 km (95 mi) NNW of Saba
Sat Aug 22 14:00 AST 19.7N 67.5W Tropical Storm 505 km (314 mi) WNW of Saba
ST. EUSTATIUS:
Till Wed Aug 26 02:00 AST, the nearest position is estimated at:
Fri Aug 21 21:00 AST 18.5N 62.6W Tropical Depression 119 km (74 mi) NNE of St. Eustatius
Fri Aug 21 05:00 AST 17.8N 58.5W Tropical Depression 475 km (295 mi) E of St. Eustatius
Fri Aug 21 14:00 AST 18.1N 60.7W Tropical Depression 250 km (156 mi) ENE of St. Eustatius
Sat Aug 22 02:00 AST 18.8N 64.0W Tropical Storm 182 km (113 mi) NW of St. Eustatius
Sat Aug 22 14:00 AST 19.7N 67.5W Tropical Storm 536 km (333 mi) WNW of St. Eustatius
Definitions:
TROPICAL STORM WATCH: A warning for tropical storm conditions, including sustained winds within the range 63-117 km/h (39-73 mph) (34-63) knots are possible in specified areas in 48 hours of less.
Next bulletin: Friday August 21, 2020, 11:38 local time