Frequently Asked Questions |
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- What is UTC, GMT, or Z time?
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- By international agreement, the local time at the
prime meridian or 0 degrees longitude, which passes through Greenwich,
England.
Since there are 15 time zones across the world, UTC acts as a
reference time for the scientific community. The terms
Coordinated Universal Time (UTC), Zulu (Z), and Greenwich Mean Time
(GMT) are equivalent.
All of the analysis and forecast products are based on this reference
time. This longitude is the line that separates the eastern and
western hemispheres.
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- How do I determine when a chart was created? When is the forecast on the chart for?
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- "ISSUED" is the time and date for when this product was created by the forecaster
- "VALID" is the time and date for when the forecast depicted will represent
the weather conditions
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www.nws.noaa.gov 
