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Time in Meteorology

Learn how to convert local standard time to Coordinated Universal Time (UTC) for accurate meteorological data exchange. Gain the essential skill to understand weather maps worldwide.

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Time in Meteorology

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  1. Time in Meteorology

  2. Meteorologists need to use the same time everywhere since we exchange data globally

  3. Meteorologists use the local standard time at the Greenwich Meridian (0° longitude, near London).Many Names • Greenwich Mean Time (GMT) • Universal Coordinated Time (UTC) • Zula Time (Z) • Generally, UTC is used today, but some groups (like the NWS) often use Z and GMT.

  4. How to convert. UTC is LATER than Pacific time since the Greenwich Meridian is to our east • UTC = PST + 8 hr • UTC = PDT + 7 hr • Uses a 24 hr clock • First, convert our time to 24 hr clock • Then, add 7 or 8 hr depending on whether we are in daylight or standard times. • If the sum is equal to or greater than 24 hr, subtract 24h and add one day.

  5. Examples • 4 AM PDT 1 October: • 4 AM become O4 • Add 7 hr = 11 UTC 1 October • 4 PM PDT 1 October • 4 PM become 16 • Add 7 hr = 23 UTC 1 October • 6 PM PDT 1 October • 6 PM becomes 18 • 18 + 7= 25 UTC. Need to subtract 24 and becomes 01 UTC 2 October • Your test: 10 PM PDT 1 October is what in UTC? • You need to be able to do this conversion or you won’t be able to understand weather maps.

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