A real forecast evaluates vertical temperature and moisture profiles, barriers to convection, forcing and the surrounding wind field. Our parcel path represents qualitative buoyancy rather than a calculated sounding or thunderstorm simulation. Change one condition, explain the resulting constraint, then test that reasoning against a separate situation at the checkpoint.
Weather and climate · Discover & try
What does a thunderstorm need?
Reading level 5 of 5 · AdvancedChange
Word help
Instability
Conditions that allow a displaced air parcel to continue rising.
Lift
A process that starts moving air upward.
Condensation
Water vapour becoming liquid droplets.
Watch · Try · Explain
See how it works
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Qualitative parcel-and-cloud schematic, not a forecast or numerical atmospheric sounding.
What to look for
- Remove lift while keeping moisture.
- Compare stable with unstable surroundings.
- Separate cloud formation from a storm guarantee.
Explain what you noticed
A humid afternoon has unstable air, but nothing lifts parcels past a stable layer. Is a thunderstorm certain?
Keep this idea: Moisture, instability and lift work together; one ingredient alone is insufficient.
Follow the sources
Source material checked 2026-10-28. Explanations and activities by Nepedia. Source links do not imply endorsement.
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