Category Archives: Forecast Models

Understanding Meteorological Time

Introduction
Weather recognizes no geographic or political borders. In order to coordinate their observations and forecasts, meteorologists around the world use a standard timekeeping system. The original standard timekeeping system was Greenwich Mean Time (GMT) a 24-hour clock system based on the local time in Greenwich, England. For example, 1:00 am in Greenwich is 0100 GMT, noon is 1200 GMT, and 6:00 pm is 18 GMT.

Since GMT is technically a time zone, it was replaced with Coordinated Universal Time (UTC) in the early 1970s. Similar to GMT, UTC is a 24-clock system that doesn’t recognize local adjustments such as Daylight Saving Time. The National Weather Service’s version of UTC is called Zulu, which is typically abbreviated as “Z” on their forecast maps and text products.
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Marine Model Output Statistics: A Unique Wind Forecasting Resource

Introduction
Sailors spend a lot of time analyzing wind forecasts, whether they’re planning a short afternoon sail, preparing for a regatta, or developing a strategy for a long-distance race. Most of this analysis relies on graphical forecast products, such as the wind speed and direction forecast for Lake Huron published by the National Weather Service shown below.

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