We know that Flight 447 encountered heavy turbulence associated with a thunderstorm before losing signal.
That afternoon, a thunderstorm moved into Manhattan right before I left the salon, umbrella-less.
After the thunderstorm the weather had grown cloudy and cool.
If it ends in a thunderstorm we shall have to put off to sea at once.
We have said that this thunderstorm may have been quite a natural phenomenon.
I might just as well try to reason with a thunderstorm as with her.
At the same instant the thunderstorm that had been gathering broke loose.
The day was cloudy; a thunderstorm was brewing, and had somehow affected his temper.
A thunderstorm occurred in the evening, and Mrs. Roach, a schoolmistress at Wroxham, was killed by lightning.
"But we haven't had any thunderstorm," Nancy called above the hubbub.
A storm of heavy rain accompanied by lightning, thunder, wind, and sometimes hail. Thunderstorms occur when moist air near the ground becomes heated, especially in the summer, and rises, forming cumulonimbus clouds that produce precipitation. Electrical charges accumulate at the bases of the clouds until lightning is discharged. Air in the path of the lightning expands as a result of being heated, causing thunder. Thunderstorms can also be caused by temperature changes triggered by volcanic eruptions and forest fires, and they occur with much greater frequency at the equatorial regions than in polar regions.