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You can follow Martian clouds and dust storms in NASA’s public images, but these are observations of atmospheric conditions—not a live forecast. Start with the Mars Color Imager (MARCI) daily global maps for broad changes over time, then use surface landmarks and map caveats to tell weather movement from imaging artifacts. CTX and HiRISE images can add terrain context and local detail.
Start with MARCI’s daily global maps
NASA’s Mars Color Imager, or MARCI, gathers pole-to-pole image swaths that are assembled into a daily global map. The maps show atmospheric features at approximately the same mid-afternoon local time, which makes a sequence of dates useful for tracking broad changes. Begin with NASA’s 2022 global map example, acquired January 9, 2022. It shows a regional dust storm obscuring Syrtis Major and Jezero Crater.
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MARCI is the best fit of these three image types for observing large-scale weather evolution: its coverage is broad and its maps repeat daily. That consistency is generally more useful for tracking a storm than the finest available pixel detail.
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- Choose a sequence. Open maps from multiple dates rather than drawing conclusions from one frame. NASA’s 2018 giant dust-storm sequence covers May 31 through June 11, 2018, and shows the storm spreading across successive maps.
- Locate stable terrain. Identify recognizable craters, dark regions, or polar deposits. Use those landmarks to align your view of the surface from one date to the next.
- Follow atmospheric features relative to that terrain. Tan or beige areas can indicate dust. If their shape or position changes while surface landmarks remain anchored, the sequence can reveal the storm’s development and movement.
- Check the map before interpreting a change. Gaps and blurry bands may be artifacts rather than weather; see the caveats below.
In NASA’s 2018 sequence, black gaps can result from targeted spacecraft roll maneuvers or missing orbit data. The maps are useful for following broad evolution, but a blank patch is not evidence that a region had clear skies.
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Tell map artifacts from atmospheric change
MARCI’s global maps are assembled from swaths, so coverage and appearance are not perfectly uniform. NASA’s 2022 map notes both gaps and saturated color pixels. NASA’s 2018 sequence also documents gaps from roll maneuvers and data drops.
- Black gaps: These can reflect missing orbit data or an MRO roll maneuver, not a weather feature.
- Saturated areas: Some color pixels may be saturated, so their appearance should not be treated as a reliable measure of atmospheric color or intensity.
- Repeated north–south bands: In sequences, equally spaced blurry bands can arise from MARCI’s high off-nadir viewing geometry. Their apparent motion can mislead if you do not compare them with surface features.
When an apparent feature shifts, first check whether the underlying terrain has shifted too. A weather interpretation is stronger when a tan or beige feature changes relative to stable surface landmarks, rather than simply appearing in a different position in the mosaic.
Recognize dust, water-ice clouds, and terrain effects
Published MARCI imagery can show both dust and water-ice clouds. Beige or tan appearance is a clue for dust in NASA’s examples, but color alone is not a detailed atmospheric measurement. The Utopia Planitia image, acquired November 7, 2007, shows a short-lived dust storm alongside gravity-wave water-ice clouds near Mie crater. NASA says the storm lasted less than 24 hours.
Some clouds form as air is displaced vertically by terrain. When wind crosses a mountain or crater wall, changes in atmospheric pressure, temperature, and height can produce lee-wave clouds. NASA describes these features in its Utopia Planitia example as gravity-wave clouds coming off Mie crater. Their presence is a reminder that cloud patterns can reflect local terrain and air flow, not only a large regional storm.
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Use CTX and HiRISE for context, not as substitutes for MARCI
NASA’s Context Camera (CTX) provides broad black-and-white terrain images, while the High Resolution Imaging Science Experiment (HiRISE) offers tightly focused, high-resolution views. They can help you inspect terrain or a local feature, but they do not provide MARCI’s broad daily global weather maps. NASA’s Mars Reconnaissance Orbiter instrument overview describes the camera roles.
| Image type | Coverage and detail | Best use for this task |
|---|---|---|
| MARCI | Broad, pole-to-pole daily global maps; atmospheric features appear at approximately the same mid-afternoon local time. | Compare large-scale atmospheric patterns across dates. |
| CTX | Broad black-and-white terrain images. | Add terrain context to a weather observation. |
| HiRISE | Tightly focused, high-resolution views. | Examine local terrain detail; it is not a daily global weather map. |
What these images can—and cannot—tell you
NASA says MARCI’s global maps are useful for monitoring weather changes that could affect surface missions. They let you observe changes visible in the imagery and compare them with terrain and dates. They are not, by themselves, a live forecast or a detailed atmospheric retrieval. Treat color and shape as clues, account for gaps and viewing effects, and avoid inferring more than the published images establish.
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