Thunderstorms and convective weather
The life cycle of a thunderstorm, the hazards it concentrates, and the products that warn of convection.
A thunderstorm concentrates nearly every aviation hazard into one place: severe turbulence, severe icing, lightning, hail, heavy rain, microburst wind shear, and tornadoes. Understanding them is mostly about knowing how far to stay away.
Three ingredients create them: moisture, unstable air, and a lifting force (a front, terrain, or heating). They develop in three stages: 1. Cumulus stage — building towering cumulus with strong updrafts. 2. Mature stage — the most violent; coexisting up- and downdrafts, precipitation reaching the ground, the anvil top, and the risk of microbursts — small, intense downdrafts that have caused fatal accidents on approach. 3. Dissipating stage — downdrafts dominate and the cell rains itself out, but it can still be dangerous.
Embedded thunderstorms (hidden in layered cloud) and squall lines (fast-moving lines ahead of a cold front) are especially hazardous because you may not see them coming.
Warnings come from Convective SIGMETs, the Convective Outlook, NEXRAD radar, METAR/TAF (TS, +TSRA, the `CB` cloud type) and PIREPs. The guidance is unambiguous: avoid a thunderstorm by at least 20 nautical miles, never fly under the anvil or between cells, and treat datalink radar as strategic, not tactical — its images can be several minutes old, long enough for a cell to grow across your path. When storms are forecast, the safest plan is often to delay.
*Reference and training only. Use official briefings for flight planning.*