National Weather Service Glossary of Terms

This page will load a random term from the NWS Glossary to help you learn the vocabulary used in NWS forecasts

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INSTBY
Instability- The tendency for air parcels to accelerate when they are displaced from their original position; especially, the tendency to accelerate upward after being lifted. Instability is a prerequisite for severe weather - the greater the instability, the greater the potential for severe thunderstorms.



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