Time in Meteorology.

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Presentation transcript:

Time in Meteorology

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

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.

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.

Examples 4 AM PDT 1 October: 4 PM PDT 1 October 6 PM 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.