Definition
A research laboratory, formerly part of the National Oceanic and Atmospheric Administration (NOAA), that developed weather forecasting tools, systems, and data products used in aviation weather services. FSL contributed to products such as graphical aviation forecasts and experimental weather displays before being reorganized into NOAA's Earth System Research Laboratory (ESRL) in 2005.
Plain English
A government weather research center that built forecasting tools and weather products for pilots and meteorologists. It was later folded into a larger NOAA research lab.
Context Anchor
Seen in older FAA weather-source discussions when a weather website, forecast display, or computer weather system is identified by the organization that developed it.
Derivation
"Forecast" comes from Old English fore- (before) + cast (to throw or plan), meaning to plan ahead. A "laboratory" is a place for research and experiment. Together: a research facility focused on developing better ways to predict the weather.
Why Pilots Care
Its work supports better aviation weather products that pilots rely on for safer flight planning and decision-making.
Intuition Check
FSL is not a forecast or a weather code. It names the laboratory that helped create or support certain weather systems.
Example Sentence 1
The graphical forecast tools described in the handbook were originally developed by the Forecast Systems Laboratory before NOAA reorganized its research divisions.
Example Sentence 2
Pilots benefit indirectly from FSL research through improved forecast accuracy in preflight briefings.