23 September 2021 - bulletin 657

Issued at 2300 GMT
Latest warnings for 18L, 20W
Final warning for 21W
Disturbance update

NORTHERN ATLANTIC OCEAN
Tropical storm Sam / 18L
Warning 05 from NHC at 2100 GMT
Position 11.1N 39.7W
Location 1635 miles ESE of the northern Leeward Islands
Movement 280° (W) at 14 knots
Maximum sustained winds 50 knots gusting to 65 knots
Winds of 34 knots or higher occur within 60 miles of the centre
Threatened landmasses NONE
Minimum central pressure 1000 mbar
Next warning from NHC at 0300 GMT

NORTHWESTERN PACIFIC OCEAN
Tropical storm Mindulle / 20W
Warning 06 from JTWC at 2100 GMT
Position 14.1N 141.8E
Location 182 miles W of Andersen AFB, Guam
Movement 285° (WNW) at 10 knots
Maximum sustained winds 45 knots gusting to 55 knots
Winds of 34 knots or higher occur within 0 to 135 miles of the centre
Threatened landmasses Northern Marianas Islands
Maximum significant wave height 13 feet
Next warning from JTWC at 0300 GMT

Tropical storm Dianmu / 21W
Warning 05 from JTWC at 1500 GMT
Position 15.2N 108.9E
Location 59 miles SE of Da Nang, Vietnam
Movement 305° (NW) at 15 knots
Maximum sustained winds 35 knots gusting to 45 knots
Winds of 34 knots or higher occur within 0 to 30 miles of the centre
Threatened landmasses Vietnam
FINAL WARNING
 
TROPICAL DISTURBANCE UPDATE
NORTHERN ATLANTIC OCEAN

Update from NHC at 1200 GMT
System 15L
Position 44.2N 42.4W
Likelihood of tropical cyclone regeneration within 48 hours is MEDIUM (60%)
Likelihood of tropical cyclone regeneration within 5 days is MEDIUM (60%)

System No Invest Assigned
Position 29N 59W
Likelihood of tropical cyclone formation within 48 hours is LOW (10%)
Likelihood of tropical cyclone formation within 5 days is LOW (10%)

EASTERN PACIFIC OCEAN
Update from NHC at 1200 GMT
System No Invest Assigned
Position 18N 123W
Likelihood of tropical cyclone formation within 48 hours is LOW (10%)
Likelihood of tropical cyclone formation within 5 days is LOW (10%)