Today, the OPC website will be unavailable beginning at 0700 EDT/1100 UTC for approximately 30 min. Please refresh your browser or navigate to https://ocean.weather.gov after the maintenance window to see the upgraded version of OPC's website.
This is a non-operational test website. For official OPC information and forecasts, please refer to the operational OPC website: https://ocean.weather.gov.
Frequently Asked QuestionsWhat is UTC, GMT, or Z time?
– 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.
How do I determine when a chart was disseminated? When is the forecast on the chart for?
– "ISSUED" is the time and date for when this product was disseminated by the forecaster
– "VALID" is the time and date for when the forecast depicted will represent the weather conditions