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Forecasting requirements for surface wind vectors over the ocean

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Satellite wind vectors over the ocean surface are a staple product for local and marine weather forecasting. Satellites can offer better coverage in space and time that enables more accurate forecasting. The community of forecasters met in Miami at a workshop on NOAA Operational Satellite Ocean Surface Vector Wind Requirements (PDF, 3 MB), at the National Hurricane Center in June 2006. The meeting united a broad spectrum of folks representing the operational weather forecasters, the research community, and remote- sensing engineers to choose NOAA's requirements for the ocean surface wind vector. Much has been learned and much has changed over the past ten years with respect to the need for surface wind observations by satellites in weather forecasting. Because of this meeting, there is now greater acceptance of these satellite winds by the forecasters. In the long term, it pushes NOAA to deliver these wind products to operational forecast centers, and to improve the forecasts of hurricane intensities and intensity of winter storms.

Forecasting Requirements for Ocean Surface Winds

  • Observations in all weather (i.e., winds are accurate in rain)
  • The accuracy of a wind observation sustained over one minute, at a height of 10 meters above the ocean, will be given by:
    • from 0 to 4 knots: speed will be ±2 knots
    • from 4 to 10 knots: speed will be ±2 knots, and direction ±20 degrees
    • from 10 to 165 knots: speed will be ±2 knots, and direction ±10 degrees
  • time interval between measurements at a point on the ocean surface: every 6 hours
  • Lag time before product is available: 45 – 60 minutes after measurement
  • Spacing between different wind observations: 2.5 km x 2.5 km
  • Wind observations to within 2.5 km of the coast
  • Wind fields must be delivered to the operational centers and data systems
  • Product documentation, tutorial, and training

Data, algorithms, and images presented on STAR websites are intended for experimental use only and are not supported on an operational basis.  More information

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