For clouds to appear green, they must be very deep (tall). Green clouds in particular typically point to severe weather. The cloud cover of an oncoming storm already envelops over a hayfield in the photo above. It does not take long until the torrential rain and severe gusts start, because the characteristic lowered cloud base with the threatening bluish-black underside (wall cloud) loom in the distance behind the mountain range. Storm Sign 3: Cloud Color Magnificent supercells develop over southwest Germany in the evening of a hot summer day in Westhausen Also known as “shelf” clouds, these wedge-shaped clouds are attached to parent clouds, resulting in a thunderstorm. In this photo, an “arcus” cloud signals foul weather. Many violent summer thunderstorms originate at the foot of the Alps and Rockies and intensify as they travel over the flat Alpine foreland. Storm Sign 2: Arcing ‘Shelf’ Clouds Arcing storm clouds in the western bank of Chiemsee, Bavaria If the atmospheric conditions are favorable, a towering cumulus cloud like this can develop into a powerful thunderstorm within an hour. Watch for vertical development, clouds that billow upward, as a storm can follow. But there are some nasty-weather cousins to these puffy clouds. Images and content courtesy Stormchasing: On the Hunt for Thunderstorms, by Michael Sachweh - Storm Sign 1: ‘Towering’ Clouds Cumulus clouds take shape in Erick, Okla.Ĭumulus clouds are often seen as fluffy, fair-weather cotton balls in the sky. Below are five cloud conditions you can watch for before a storm breaks. We caught up with one such chaser, Michael Sachweh, author of “ Stormchasing: On the Hunt for Thunderstorms.” We asked for some basic clues anyone could spot that warn of inclement weather on the horizon. But nature provides some signals that weather events are on the way, and many low-tech storm chasers make hobbies and careers out of reading those signs. Even high-tech forecasting technology sometimes fails to spot impending rain, snow, or calm. Here are some telltale signs a storm is brewing. Spring has sprung and so begins another season of severe summer weather.
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