Wind And Tides Credential Direct

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Frequently Asked Questions

• Why do we need accurate tides and currents?

  We need accurate tide and current data to aid in navigation, but these measurements also play an important role in keeping people and the environment safe. A change in water level (due to tides) can leave someone stranded (or flooded).

• What's the difference between flow tide and Ebb Tide?

  A flow tide or a flood tide is a rising tide or incoming tide which results in a high tide. It is thus the time period between a low tide and a high tide (i.e., the rising time). Ebb Tide is the receding or outgoing tide.

• Where do the tides start and where do they go?

  Tides start in the ocean and move towards the coast, where they appear as the regular rise and fall of the sea surface. How much the water level changes over the day varies depending on where you are and what day it is. Currents.

• What is the mean low water on a tide chart?

  Mean lower low water, or the average of all observed lower low waters (the lower of the two low waters of any tidal day), is known as chart datum in most areas. Mean high water, or the average of all observed high-water levels, is the datum used to represent shoreline on charts.

• How is wind speed indicated in weather plots?

  Wind speed. A combination of long/short barbs and pennants indicate the speed of the wind in station weather plots rounded to the nearest 5 knots. Calm wind is indicated by a large circle drawn around the skycover symbol. One long barb is used to indicate each 10 knots with the short barb representing 5 knots.

• What's the average speed of a straight line wind?

  During strong thunderstorms, straight line wind speeds can exceed 100 mph. High winds can blow objects around and pose a significant threat to your safety. Understanding the risks can help you prepare for these events.

• How is the direction of the wind indicated?

  The wind direction is indicated by the long shaft. The shaft will point to the direction FROM which the wind is blowing. The direction is based upon a 36-point compass.

• What are the dangers of high wind speeds?

  When winds are sustained at 40-50 mph, isolated wind damage is possible. Widespread significant wind damage can occur with higher wind speeds. During strong thunderstorms, straight line wind speeds can exceed 100 mph. High winds can blow objects around and pose a significant threat to your safety.