These are also called weather systems, or "lows". A cyclone is a large area of low pressure. Cyclones have air flowing counterclockwise around them in the Northern Hemisphere.

Development of this low is becoming less likely due to unfavorable upper-level winds. There is a medium chance, 30 percent, of this system becoming a tropical cyclone during the next 48 hours as ...

Tropical Weather OutlookAnother area of low pressure, the remnant of Tropical Depression Julia, is located about 350 miles southeast of Bermuda and is moving westward near 15 mph. Conditions are ...

A developing tropical weather system off the coast of northeastern Florida is raising concerns over potential heavy rainfall ...

If a tropical disturbance organizes into a rotating system of low atmospheric pressure with sustained winds increasing to as high as 38 mph, it is upgraded to a tropical depression.

The low pressure area inside the Philippine Area of Responsibility (PAR) now has a medium potential to develop into a ...

The low-pressure system has reached peak intensity and is no longer deepening but its peak winds remain equivalent to the strength of a tropical cyclone. The main centre has now moved north-east ...