How can radar reflectivity data help identify severe weather cells?

• A. High reflectivity values indicate strong precipitation; patterns and trends in reflectivity help identify convective cells and potential severity.
• B. Low reflectivity indicates severe storms; patterns help identify calm areas.
• C. Reflectivity data is not useful for weather assessment.
• D. Reflectivity alone can determine exact storm intensity.

Answer: (A)

Radar reflectivity measures how much energy is reflected back from precipitation, which correlates with the amount and size of hydrometeors in a storm. When updrafts are strong and storm cells are intensifying, you see high reflectivity values concentrated in bright cores. Those bright cores indicate dense precipitation and often hail, which are common in severe storms. The real insight comes from patterns and how they change over time: a compact, intense core that rapidly grows, or recognizable shapes like bow echoes or hook echoes, signal a storm that is organizing and strengthening. By watching how the reflectivity field evolves across the storm and over minutes, forecasters can identify convective cells that are likely to become severe and issue timely warnings. While reflectivity alone doesn’t determine exact storm intensity, and very low values don’t indicate severe weather, high, rapidly evolving reflectivity patterns are a strong indicator of potential severity.