I'm confused about how to interpret time periods for weather forecasts. For example, when a forecast says it's a 12 hour forecast does that mean the forecast was made 12 hours prior to the valid time or that the forecast is for a period of time for 12 hours following the valid time?
In the explanation below, what is meant by the "forecast interval"?
Low altitude Significant Weather charts are issued four times daily and are valid at fixed times: 0000, 0600, 1200, and 1800 UTC. Each 4 panel chart is divided on the left and right into 12 and 24 hour forecast intervals (based on the current ETA model available).
Thanks
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