Week-2 Marine Hazards Outlook

Week-2 Marine Hazards Outlook – Probability Maps

EXPERIMENTAL

These images are updated every Monday, Wednesday and Friday.

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Significant Wave Height (meters)
10m Wind Speed (knots)

4 m
6 m
9 m
14 m

34 kt
48 kt
64 kt

Product Description

Results are statistically derived from the operational Global Ensemble Forecast System (GEFS), calibrated and validated for hazardous weather conditions. Probabilities are produced for three wind speed (34, 48, and 64 knots) and four significant wave height (4, 6, 9, and 14 meters) thresholds for a one-week cumulative interval, associated with week 2. The values provide the probability the event will occur sometime during the specified one-week cumulative forecast period at the locations specified on the map.

For more information:

NWS Product Description Document

Week-2 probability maps in KML format, including archived KML data, are available at:
https://ftp.ocean.weather.gov/gis/week2probs/

Campos, R.M., D. Figurskey, A. Mehra, and J. Sienkiewicz, 2025: Probabilistic Wave Forecast for Week 2 and beyond Based on NOAA’s Global Ensemble Forecast System. Published in Weather and Forecasting.

GitHub: Source code