21/05/2026
An LPA (Low Pressure Area) has formed over the Pacific Ocean, located 757 km East of Mati City, Davao Oriental. It is moving slowly to the west.
Meanwhile, the Southwest Monsoon (Habagat) continues to bring rain to Southeast Asia, including Myanmar, Laos, Vietnam, Thailand, Cambodia, Bangladesh, and Malaysia. Please watch out for floods and landslides.
🌬 High Winds & Developing StormsOur primary concern is a developing low-pressure system (1002 hPa) currently positioned over the Sea of Japan at 37N 133E.
Movement: Tracking east-northeast at 15 knots.
Impact: Expect a rapid increase in winds over the next 6 hours. Gale-force winds between 30 to 35 knots are anticipated within 800 miles in the low's western semicircle, and up to 400 miles in all other directions.
Just to the east, a second 1004 hPa low at 36N 143E is moving steadily eastward at 15 knots, further complicating conditions along the major shipping routes.
🌫️ Severe Dense Fog Warnings
Visibility is a major hazard tonight. We have issued two urgent warnings for dense, localized fog:
Regional Seas: Heavy fog is impacting the Sea of Okhotsk, Sea of Japan, Yellow Sea, and the East China Sea.
Open Pacific: A massive blanket of dense fog is stretching across the Northwest Pacific. This hazardous zone is bounded roughly from the coast of Japan (near 36N 141E), extending northeast past the Kuril Islands up toward the Bering Sea (60N 172E), and looping south into the Philippine Sea (24N 128E). Mariners in these coordinates should prepare for near-zero visibility.
🗺️ Fronts and Surrounding Systems
A complex network of weather fronts is draped across the region:
Active Fronts: A 1004 hPa low at 42N 157E is anchoring a warm front stretching southeast toward 39N 163E, and a cold front trailing southwest toward 38N 149E.
Stationary Front: A massive, stalled front stretches all the way from Southern China (23N 110E), cutting across the East China Sea, riding right along the southern coast of Japan, and extending out into the Pacific past 147E. Expect prolonged overcast skies and unsettled weather along this line.
Other Lows: We are monitoring a weak 1004 hPa low drifting slowly east-southeast near the Korean Peninsula (36N 126E), and a tropical 1008 hPa low-pressure area drifting slowly west in the Philippine Sea near 06N 133E.
High Pressure: Fairer weather dominates further east, anchored by a strong 1022 hPa high racing east at 30 knots near 39N 175E, and two weaker 1018 hPa highs shifting over the Sea of Okhotsk and the central Pacific.
