Quickly moving air masses produce high winds and cooler temperatures. As the rapidly rising warm air cools, its water condenses and clouds form cumulonimbus, then cumulus. The result is heavy rain or thunderstorms, giving way to showers and finally to clear skies as the cold front moves away eastwards. A depression on a weather chart Key features of a depression Pressure — Low and falling below mb. Temperature — Varies depending on the air mass passing overhead and the time of year.
Cloud cover — An ever-changing selection of clouds will change as the depression passes. The maximum amount of cloud will be when the cold front passes overhead. This is also when the storm gets a name. The winds blow faster and begin twisting and turning around the eye, or calm center, of the storm.
Wind direction is counterclockwise west to east in the northern hemisphere and clockwise east to west in the southern hemisphere. This phenomenon is known as the Coriolis effect.
When the wind speeds reach 74 mph, the storm is officially a hurricane. The storm is at least 50, feet high and around miles across. The eye is around 5 to 30 miles wide. The trade winds which blow from east to west push the hurricane toward the west—toward the Caribbean, the Gulf of Mexico, or the southeastern coast of the U.
The winds and the low air pressure also cause a huge mound of ocean water to pile up near the eye of the hurricane, which can cause monster storm surges when all this water reaches land. Depressions typically move over the UK from west to east.
The UK is affected by around depressions every year. If you've found the resources on this page useful please consider making a secure donation via PayPal to support the development of the site. The site is self-funded and your support is really appreciated. If you've found the resources on this site useful please consider making a secure donation via PayPal to support the development of the site.
Atlantic Depressions and the British Isles. Atlantic Depressions and the British Isles Frontal depressions have a significant impact on weather across the British Isles.
A depression over the UK. Features of a depression. Related Topics Use the images below to explore related GeoTopics. Topic Home. As of 11 p. Tropical Depression 18 could strengthen into a tropical storm as early as Wednesday night or Thursday morning. The system is expected to strengthen into a major hurricane later in the weekend as in gets close to the Lesser Antilles. Interest in the Caribbean should pay close attention to the progress of the storm, although early indications suggest this storm will move north and turn out to to sea.
It is too early to know if this system will impact the Caribbean or U.
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