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Terminology used in the Shipping Forecast


Gale Warnings
  • Gale
    Winds of at least Beaufort force 8 (34-40 knots) or gusts reaching 43-51 knots.
  • Severe Gale
    Winds of force (41-47 knots) or gusts reaching 52-60 knots.
  • Violent Storm
    Winds of force 11 (56-63 knots) or gusts of 69 knots or more.
  • Hurricane Force
    Winds of force 12 (64 knots or more). Note the term is Hurricane Force: the term hurricane on its own is only used to imply a true tropical cyclone.
  • Imminent
    Expected within 6 hours of time of issue.
  • Soon
    Expected within 6 to 12 hours of time of issue.
  • Later
    Expected more than 12 hours from time of issue.

Visibility
  • Fog
    Visibility less than 1000m.
  • Poor
    Visibility between 1000m. and 2 n.miles.
  • Moderate
    Visibility between 2 and 5 n.miles.
  • Good
    Visibility more than 5 n.miles.

Movement of Pressure Systems
  • Slowly
    Moving at less than 15 knots.
  • Steadily
    Moving at 15 to 25 knots.
  • Rather Quickly
    Moving at 25 to 35 knots.
  • Rapidly
    Moving at 35 to 45 knots.
  • Very Rapidly
    Moving at more than 45 knots.

Pressure Tendency in Station Reports
  • Rising (or Falling) Slowly
    Pressure change of 0.1 to 1.5 hPa in the preceding 3 hours.
  • Rising (or Falling)
    Pressure change of 1.6 to 3.5 hPa in the preceding 3 hours.
  • Rising (or Falling) Quickly
    Pressure change of 3.6 to 6.0 hPa in the preceding 3 hours.
  • Rising (or Falling) Very Rapidly
    Pressure change of more than 6.0 hPa in the preceding 3 hours.
  • Now Rising (or Falling)
    Pressure has been falling (rising) or steady in the preceding 3 hours, but at the time of observation was definitely rising (or falling).

Wind
  • Wind Direction
    Indicates the direction from which the wind is blowing.
  • Wind Becoming Cyclonic
    Indicates that there will be considerable change in wind direction across the path of a depression within the forecast area.
  • Veering
    The changing of the wind in the direction of motion of the hands of a clock, e.g. SW to W.
  • Backing
    The opposite direction to veering, e.g. SE to NE.