To judge whether a shower may affect your plans soon, check the radar’s timestamp and legend, find your location, and watch several frames rather than relying on one still image. Follow the echo’s recent direction and speed, then check the local forecast and alerts. Radar shows sampled precipitation and its recent movement—not a guaranteed path or exact arrival time.
Start with the right radar view
Open a radar display centered on the place that matters, such as your home, commute, or outdoor event. The National Weather Service radar viewer brings radar together with location forecasts and alerts. Confirm which product is selected, read its timestamp, and use that product’s own color legend.
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The viewer can show a national mosaic or individual radar products. A broader mosaic helps you see the surrounding weather pattern; a local view makes it easier to follow nearby echoes. The useful choice depends on your question, and no single reflectivity view is best for every situation. The viewer’s controls and display may change over time; its FAQ describes version 2.0, updated September 6, 2023.
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Reflectivity represents radar energy returned by targets in the beam. It helps show where precipitation is occurring and compare stronger with weaker echoes, but it is not a direct measurement of rainfall at ground level. NOAA’s JetStream radar education page puts it simply: “The reflectivity product will show where precipitation is occurring.” NOAA JetStream: An Introduction to Doppler Radar
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Many displays use dBZ, a logarithmic measure of returned energy. A stronger return often indicates heavier precipitation, but the relationship depends on what the beam is detecting. Different drop sizes, hail, and other targets can produce returns that complicate a simple color-to-rain interpretation. Always consult the legend for the selected product; colors and palettes can differ between displays.
NOAA JetStream gives these approximate hourly rain-rate equivalents for selected dBZ values. They are estimates, not guaranteed surface conditions or the total rain a location will receive.
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| Reflectivity | NOAA approximate rain rate |
|---|---|
| 20 dBZ | 0.01 in/hr (trace) |
| 30 dBZ | 0.10 in/hr (3 mm/hr) |
| 40 dBZ | 0.45 in/hr (12 mm/hr) |
| 50 dBZ | 1.90 in/hr (47 mm/hr) |
These are NOAA JetStream’s reference figures; the retrieved page does not state a publication year (accessed 2026). A rate is not an accumulation: total rainfall depends on how the intensity changes and how long precipitation remains over a place.
Animate several frames to see where a shower is going
A still frame shows an echo’s position at one scan time. Play the loop or step through successive time-stamped frames to see its recent path. NWS precipitation volume scans occur on a several-minute cadence that varies with the radar’s scanning strategy, so the loop is a sequence of separate snapshots, not continuous tracking. NWS JetStream: Radar
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- Locate the echo. Identify the precipitation return on the map and note its position relative to your location.
- Follow the same echo through multiple frames. Watch its direction and how far it travels between timestamps. Do not infer its motion from one position alone.
- Compare its recent path with your location. If it appears to be moving toward you, its recent movement offers a first approximation of whether it may arrive soon.
- Recheck the latest timestamp. A stale image can give a misleading impression of how close the shower is.
Do not confuse Doppler velocity colors with the direction a rain echo is traveling across the map. A velocity product shows motion toward or away from the radar beam; an ordinary reflectivity loop shows precipitation echoes. NWS JetStream: Radar
Estimate arrival time cautiously
To make a rough near-term estimate, note how far an echo moves between frames and how much time passes, then compare its recent path with the remaining distance to your location. This is simple extrapolation: it assumes the echo continues in roughly the same direction and at a similar speed. It is a first guess, not an exact arrival forecast. The NWS radar training material frames the question as “When will storms reach me?” and describes extrapolating observed motion for rainfall nowcasts. NWS radar training appendix
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That estimate can fail if a shower grows, weakens, or changes direction. Radar shows precipitation already within its coverage; a single view cannot reveal precipitation that has not yet moved into that coverage. Forecasting storm growth and decay requires information beyond a simple track of recent echoes.
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Use the forecast and alerts alongside radar
Radar helps answer what precipitation is being observed and where it has moved recently. A local forecast adds context about what is expected, while alerts identify official hazard information. Check both for the location you care about before changing plans. The NWS viewer provides location, product, timestamp, and legend controls and can display forecasts and alerts with radar. NWS Radar FAQ
Know what radar may miss or misrepresent
Small showers and distant echoes
A precipitation target has to fill enough of the radar beam to be detected reliably. Small showers, especially at greater distances, can be difficult to see. NWS glossary: beam filling
The beam can sample above the surface
As distance from a radar increases, its beam samples higher above the ground. It may overshoot precipitation or sample it incompletely, contributing to errors in radar rainfall estimates, particularly at greater range. NWS Morristown: Radar rainfall estimates
Product views have different strengths
Base reflectivity is useful for long-range precipitation detection and storm-scale features, but the strongest part of a storm may not be sampled at the lowest elevation. Developing storms close to the radar can also go undetected in that product. Composite reflectivity displays the highest reflectivity through the atmospheric column; it can help assess storm intensity and show developing storms near the radar, but it may mask features such as hook echoes and outflow boundaries. For shower planning, focus on a clearly labeled reflectivity product and its animated, time-stamped frames rather than assuming one view is universally superior. NOAA JetStream: An Introduction to Doppler Radar
Quick Recap
A quick decision routine
- Check the map location, selected product, timestamp, and matching legend.
- Watch several reflectivity frames and follow the echo relative to your location.
- Treat any arrival estimate as approximate, since the echo can change or take a different path.
- Check the local forecast and active alerts before deciding what to do.
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