11 August 2026 - bulletin 541

Issued at 0845 GMT
Latest warnings for 13W, 14W and 15W
Disturbance update

---

NORTHWESTERN PACIFIC OCEAN
Tropical depression Peilou / 13W
Warning 18 from JTWC at 0900 GMT
Position 26.0N 158.0E
Location 623 miles NW of Wake Island
Movement 050° (NE) at 6 knots
Maximum sustained winds 30 knots gusting to 40 knots
Threatened landmasses NONE
Minimum central pressure 997 mbar 
Maximum significant wave height 12 feet
Next warning from JTWC at 1500 GMT

Tropical storm Chan-hom / 14W
Warning 18 from JTWC at 0900 GMT
Position 36.5N 142.0E
Location 133 miles ENE of Yokosuka, Japan
Movement 255° (WSW) at 13 knots
Maximum sustained winds 40 knots gusting to 50 knots
Winds of 34 knots or higher occur within 75 to 175 miles of the centre
Threatened landmasses Japan
Minimum central pressure 982 mbar 
Maximum significant wave height 25 feet
Next warning from JTWC at 1500 GMT

Tropical depression 15W
Warning 06 from JTWC at 0900 GMT
Position 28.4N 160.8E
Location 632 miles NNW of Wake Island
Movement 030° (NNE) at 10 knots
Maximum sustained winds 25 knots gusting to 35 knots
Threatened landmasses NONE
Minimum central pressure 997 mbar 
Maximum significant wave height 11 feet
Next warning from JTWC at 1500 GMT

TROPICAL DISTURBANCE UPDATE
NORTHWESTERN PACIFIC OCEAN
Update from JTCW at 0600 GMT
System 91W
Position 22.2N 136.6E
Location 303 miles WSW of Iwo To
Minimum central pressure 1001 mbar 
Likelihood of tropical cyclone formation within 24 hours is LOW

NORTHERN ATLANTIC OCEAN
Update from NHC at 0600 GMT 
System No Invest Assigned 
Position 10N 50W 
Likelihood of tropical cyclone formation within 48 hours is LOW (10%)
Likelihood of tropical cyclone formation within 7 days is LOW (10%)

System No Invest Assigned
Position 10N 30W
Likelihood of tropical cyclone formation within 48 hours is LOW (30%)
Likelihood of tropical cyclone formation within 7 days is HIGH (70%)

System No Invest Assigned 
Position 30N 68W 
Likelihood of tropical cyclone formation within 48 hours is LOW (10%)
Likelihood of tropical cyclone formation within 7 days is LOW (10%)

EASTERN PACIFIC OCEAN
Update from NHC at 0600 GMT
System No Invest Assigned 
Position 11N 130W
Likelihood of tropical cyclone formation within 48 hours is LOW (30%)
Likelihood of tropical cyclone formation within 7 days is MEDIUM (60%)

CENTRAL PACIFIC OCEAN
Update from CPHC at 0600 GMT
System 93C
Position 10.7N 140.8W
Minimum central pressure 1006 mbar
Likelihood of tropical cyclone formation within 48 hours is MEDIUM (60%)
Likelihood of tropical cyclone formation within 7 days is HIGH (90%)

10 August 2026 - bulletin 540

Issued at 2145 GMT
Latest warnings for 13W, 14W and 15W
Disturbance update

---

NORTHWESTERN PACIFIC OCEAN
Tropical storm Peilou / 13W
Warning 16 from JTWC at 2100 GMT
Position 22.4N 154.1E
Location 725 miles WNW of Wake Island
Movement 055° (NE) at 14 knots
Maximum sustained winds 35 knots gusting to 45 knots
Winds of 34 knots or higher occur within 50 miles to the south of the centre
Threatened landmasses NONE
Minimum central pressure 994 mbar 
Maximum significant wave height 15 feet
Next warning from JTWC at 0300 GMT

Tropical storm Chan-hom / 14W
Warning 16 from JTWC at 2100 GMT
Position 36.8N 145.9E
Location 274 miles ENE of Narita Airport, Japan
Movement 310° (NW) at 19 knots
Maximum sustained winds 45 knots gusting to 55 knots
Winds of 34 knots or higher occur within 40 to 175 miles of the centre
Threatened landmasses Japan
Minimum central pressure 980 mbar 
Maximum significant wave height 25 feet
Next warning from JTWC at 0300 GMT

Tropical depression 15W
Warning 04 from JTWC at 2100 GMT
Position 27.5N 160.2E
Location 605 miles NW of Wake Island
Movement 270° (W) at 4 knots
Maximum sustained winds 25 knots gusting to 35 knots
Threatened landmasses NONE
Minimum central pressure 997 mbar 
Maximum significant wave height 11 feet
Next warning from JTWC at 0300 GMT

TROPICAL DISTURBANCE UPDATE
NORTHERN ATLANTIC OCEAN
Update from NHC at 0600 GMT 
System No Invest Assigned 
Position 10N 40W 
Likelihood of tropical cyclone formation within 48 hours is LOW (10%)
Likelihood of tropical cyclone formation within 7 days is LOW (10%)

System No Invest Assigned
Position 10N 25W
Likelihood of tropical cyclone formation within 48 hours is NIL
Likelihood of tropical cyclone formation within 7 days is MEDIUM (50%)

System No Invest Assigned 
Position 30N 68W 
Likelihood of tropical cyclone formation within 48 hours is LOW (10%)
Likelihood of tropical cyclone formation within 7 days is LOW (10%)

EASTERN PACIFIC OCEAN
Update from NHC at 0600 GMT
System No Invest Assigned 
Position 13N 113W
Likelihood of tropical cyclone formation within 48 hours is NIL
Likelihood of tropical cyclone formation within 7 days is LOW (10%)

System No Invest Assigned 
Position 11N 130W
Likelihood of tropical cyclone formation within 48 hours is LOW (30%)
Likelihood of tropical cyclone formation within 7 days is MEDIUM (60%)

CENTRAL PACIFIC OCEAN
Update from CPHC at 0600 GMT
System 93C
Position 10.6N 141.2W
Minimum central pressure 1007 mbar
Likelihood of tropical cyclone formation within 48 hours is MEDIUM (50%)
Likelihood of tropical cyclone formation within 7 days is HIGH (90%)

10 August 2026 - bulletin 539

Issued at 1545 GMT
Latest warnings for 13W, 14W and 15W
Disturbance update

---

NORTHWESTERN PACIFIC OCEAN
Tropical storm Peilou / 13W
Warning 15 from JTWC at 1500 GMT
Position 21.6N 152.8E
Location 170 miles SSW of Minami Tori Shima
Movement 075° (ENE) at 17 knots
Maximum sustained winds 30 knots gusting to 40 knots
Threatened landmasses NONE
Minimum central pressure 993 mbar 
Maximum significant wave height 15 feet
Next warning from JTWC at 2100 GMT

Tropical storm Chan-hom / 14W
Warning 15 from JTWC at 1500 GMT
Position 35.5N 147.9E
Location 401 miles E of Yokosuka, Japan
Movement 315° (NW) at 10 knots
Maximum sustained winds 45 knots gusting to 55 knots
Winds of 34 knots or higher occur within 50 to 125 miles of the centre
Threatened landmasses Japan
Minimum central pressure 981 mbar 
Maximum significant wave height 20 feet
Next warning from JTWC at 2100 GMT

Tropical depression 15W
Warning 03 from JTWC at 1500 GMT
Position 27.5N 160.6E
Location 592 miles NNW of Wake Island
Movement 020° (NNE) at 11 knots
Maximum sustained winds 30 knots gusting to 40 knots
Threatened landmasses NONE
Minimum central pressure 996 mbar 
Maximum significant wave height 12 feet
Next warning from JTWC at 2100 GMT

TROPICAL DISTURBANCE UPDATE
EASTERN PACIFIC OCEAN
Update from NHC at 0600 GMT
System No Invest Assigned 
Position 13N 113W
Likelihood of tropical cyclone formation within 48 hours is NIL
Likelihood of tropical cyclone formation within 7 days is LOW (10%)

System No Invest Assigned 
Position 11N 130W
Likelihood of tropical cyclone formation within 48 hours is LOW (30%)
Likelihood of tropical cyclone formation within 7 days is MEDIUM (60%)

CENTRAL PACIFIC OCEAN
Update from CPHC at 0600 GMT
System 93C
Position 10.6N 141.2W
Minimum central pressure 1007 mbar
Likelihood of tropical cyclone formation within 48 hours is MEDIUM (50%)
Likelihood of tropical cyclone formation within 7 days is HIGH (90%)

NORTHERN ATLANTIC OCEAN
Update from NHC at 0600 GMT 
System No Invest Assigned 
Position 10N 40W 
Likelihood of tropical cyclone formation within 48 hours is LOW (10%)
Likelihood of tropical cyclone formation within 7 days is LOW (10%)

System No Invest Assigned
Position 10N 25W
Likelihood of tropical cyclone formation within 48 hours is NIL
Likelihood of tropical cyclone formation within 7 days is MEDIUM (50%)

System No Invest Assigned 
Position 30N 68W 
Likelihood of tropical cyclone formation within 48 hours is LOW (10%)
Likelihood of tropical cyclone formation within 7 days is LOW (10%)

10 August 2026 - bulletin 538

Issued at 0915 GMT
Latest warnings for 13W and 14W
First warning for 15W
Disturbance update

---

NORTHWESTERN PACIFIC OCEAN
Tropical storm Peilou / 13W
Warning 14 from JTWC at 0900 GMT
Position 21.1N 151.0E
Location 249 miles SW of Minami Tori Shima
Movement 075° (ENE) at 22 knots
Maximum sustained winds 40 knots gusting to 50 knots
Winds of 34 knots or higher occur within 30 to 50 miles of the centre
Threatened landmasses NONE
Minimum central pressure 995 mbar 
Maximum significant wave height 15 feet
Next warning from JTWC at 1500 GMT

Tropical storm Chan-hom / 14W
Warning 14 from JTWC at 0900 GMT
Position 34.8N 148.8E
Location 448 miles E of Yokosuka, Japan
Movement 325° (NW) at 13 knots
Maximum sustained winds 40 knots gusting to 50 knots
Winds of 34 knots or higher occur within 0 to 140 miles of the centre
Threatened landmasses Japan
Minimum central pressure 985 mbar 
Maximum significant wave height 19 feet
Next warning from JTWC at 1500 GMT

Tropical storm 15W
Warning 02 from JTWC at 0900 GMT
Position 27.1N 160.7E
Location 570 miles NW of Wake Island
Movement 020° (NNE) at 16 knots
Maximum sustained winds 35 knots gusting to 40 knots
Winds of 34 knots or higher occur within 65 to 80 miles to the east of the centre
Threatened landmasses Japan
Minimum central pressure 993 mbar 
Maximum significant wave height 12 feet
Next warning from JTWC at 1500 GMT

TROPICAL DISTURBANCE UPDATE
NORTHWESTERN PACIFIC OCEAN
Update from JTWC at 0300 GMT
System 98W is now 15W

EASTERN PACIFIC OCEAN
Update from NHC at 0600 GMT
System No Invest Assigned 
Position 13N 113W
Likelihood of tropical cyclone formation within 48 hours is NIL
Likelihood of tropical cyclone formation within 7 days is LOW (10%)

System No Invest Assigned 
Position 11N 130W
Likelihood of tropical cyclone formation within 48 hours is LOW (30%)
Likelihood of tropical cyclone formation within 7 days is MEDIUM (60%)

CENTRAL PACIFIC OCEAN
Update from CPHC at 1800 GMT
System 93C
Position 10.6N 141.2W
Minimum central pressure 1007 mbar
Likelihood of tropical cyclone formation within 48 hours is MEDIUM (50%)
Likelihood of tropical cyclone formation within 7 days is HIGH (90%)

NORTHERN ATLANTIC OCEAN
Update from NHC at 0600 GMT 
System No Invest Assigned 
Position 10N 40W 
Likelihood of tropical cyclone formation within 48 hours is LOW (10%)
Likelihood of tropical cyclone formation within 7 days is LOW (10%)

System No Invest Assigned
Position 10N 25W
Likelihood of tropical cyclone formation within 48 hours is NIL
Likelihood of tropical cyclone formation within 7 days is MEDIUM (50%)

System No Invest Assigned 
Position 30N 68W 
Likelihood of tropical cyclone formation within 48 hours is LOW (10%)
Likelihood of tropical cyclone formation within 7 days is LOW (10%)