List of Category 1 Pacific hurricanes

During the late spring, summer, and fall months from May to November, these effects are reduced or may even vanish altogether, while sea surface temperatures are warm enough to support the development, perhaps even rapid, of tropical cyclones.

The El Niño–Southern Oscillation plays a major role in the strength of trade winds and the sea surface temperatures in the tropical Pacific.

During El Niño events, trade winds are weaker and sea surface temperatures are warmer, allowing for the development of more cyclones as well as more intense hurricanes, while the effects of La Niña are the opposite.

[2] Should a Category 1 hurricane make landfall, its strongest winds can cause moderate damage to human infrastructure, especially to older buildings.

Another factor preventing tropical cyclones from forming during the winter is the presence of a semi-permanent low-pressure area called the Aleutian Low between January and April.

Its effects in the central Pacific near the 160th meridian west cause tropical waves that form in the area to move northward into the Gulf of Alaska.

The Aleutian Low's retreat in late April allows the warmth of the Pacific High to meander in, bringing its powerful clockwise wind circulation with it.

As a result, the earliest tropical waves begin to form,[10] coinciding with the start of the eastern Pacific hurricane season on May 15.

[8] During summer and early fall, sea surface temperatures rise further, reaching 29 °C (84 °F) in July and August, well above the 26.5 °C (79.7 °F) threshold for the formation and intensification of tropical cyclones.

During El Niño events, sea surface temperatures increase in the Northeast Pacific and vertical wind shear decreases.