Tropical Storm 15W intensified over the western Pacific Ocean at 28.4°N, 160.8°E on August 11, 2026, with sustained winds of 65 knots and a projected path toward Japan and the Korean Peninsula. The system poses significant wind, heavy rain, and storm surge risks to populated coastal regions across East Asia within 72 hours.
THE SCIENCE
Tropical Storm 15W formed over anomalously warm waters (sea surface temperature 29–30°C) in the northwest Pacific, where atmospheric moisture and low wind shear created ideal conditions for cyclogenesis. The Coriolis force at 28°N latitude enabled rotation and sustained organization. Upper-level outflow channels and mid-latitude jet stream interactions are steering the system northwestward at 15 knots—a typical August recurvature pattern that often intensifies storms as they transition toward cooler waters and stronger vertical wind shear.
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Warm Ocean Fuel
Sea surface temperatures 1–2°C above seasonal mean supply latent heat energy for sustained convection and potential intensification.
Thermodynamic driver
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Wind Shear & Steering
Tropical jet streams and mid-latitude high-pressure systems dictate northwestward movement and interaction with frontal boundaries.
Kinematic control
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East Asia Vulnerability
Japan, South Korea, and eastern China face peak exposure during August peak typhoon season; August 15W historically similar to 2012 Bolaven and 2018 Noru.
Regional risk
HOW PANDITA DATA TRACKS THIS
Pandita Data's real-time weather simulation integrates NOAA GOES-18 satellite imagery (0.5 km resolution cloud-top analysis), Naval Research Laboratory (NRL) microwave imagery, and Japan Meteorological Agency (JMA) doppler radar data. Cloud-top temperatures and spiral structure confirm warm-core circulation; upper-level wind vectors from NOAA GFS confirm outflow asymmetry and steering currents.
TROPICAL STORM 15W: FORECAST CONFIDENCE
72-hour track error ±200 km; intensity forecast uncertain due to wind shear transition. Storm surge modeling shows 1–2 m inundation risk for exposed bays; rainfall forecasts 150–250 mm over mountainous regions of Japan and Korea.
EMERGENCY PREPAREDNESS
1
Monitor Hourly Updates
Check JMA, KMA, or CMA official typhoon forecasts every 6 hours. Track storm surge timing—peak inundation risk occurs 2–4 hours after eye passage. Evacuate if local authorities issue orders; do not wait for official evacuation orders in storm surge zones.
2
Secure Outdoor Objects
Wind gusts exceed 80 knots in eyewall; anchor loose items, trim dead branches, and board windows. Expect power outages lasting 24–72 hours.
3
Never Walk or Drive in Floodwater
30 cm of moving water can sweep away a car; 60 cm sweeps away a truck. Move to higher ground before heavy rain begins.
Watch Pandita Data's real-time 3D weather simulation to see satellite-derived cloud motion vectors, sea surface temperature anomalies, and 10-day ensemble forecast spread. Track storm track confidence cones and wind field expansion as 15W approaches the coast.
FREQUENTLY ASKED QUESTIONS
What is causing this severe weather?
Warm Pacific waters (29–30°C) and low wind shear enable sustained convection. Mid-latitude steering currents guide the system northwestward toward Japan and Korea.
What are the greatest hazards from this storm?
65+ knot winds, 150–250 mm rainfall, storm surge 1–2 m in exposed bays, and 24–72-hour power outages across East Asia within 72 hours.
What precautions should people take immediately?
Evacuate storm surge zones now. Secure outdoor objects, stock food/water, monitor JMA/KMA forecasts every 6 hours. Never drive or walk in floodwater.