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Resources

Additional Radar Tools

NWS Radar Mosaic

Official National Weather Service national radar loop. Includes dual-pol products and storm-relative motion.

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SPC Observational Maps

Storm Prediction Center's real-time surface observations, plotted on maps for synoptic analysis.

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College of DuPage Radar

Academic radar viewer with satellite and soundings. Free and updated frequently.

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Radar Omega

Advanced dual-pol radar analysis tool. Best for examining rotation, debris signatures, and storm structure in detail.

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Interpretation

Radar Reading Tips

Check Velocity

Reflectivity shows storm intensity, but velocity (Doppler) reveals rotation. Look for green/red couplets close together — that indicates a rotating storm.

Dual-Pol Products

Correlation Coefficient (CC) below 0.95 co-located with a rotation couplet is a debris signature — a strong indicator a tornado is on the ground.

Tilt Strategy

Always check multiple elevation tilts, not just base reflectivity. The lowest tilt (0.5°) is best for detecting ground-level rotation. Higher tilts reveal storm structure.

Look for the Hook

A hook echo extending from the right-rear of a supercell is the classic radar signature of a mesocyclone. The hook often wraps around where a tornado is located.