A low pressure trough moving slowly westward through the northwestern Hawaiian Islands caused destructive flooding and mudslides over the past weekend. The trough disrupted the normal northeast trade winds flow north of Oahu on April 12, 2018. This caused extremely heavy rainfall as the trough deepened and moved very slowly over Kauai during the weekend. The 28.1 inches (713 mm) of rain reported in Hanalei within a 24 hour period was close to a record for the small town on Kauai's northern coast. Almost 32.4 inches (822 mm) of rain was reported during the same period over Wainiha, Kauai.
The mountains of Mauna Kea and Mauna Loa in the Hawaiian Islands have recently received heavy snowfall. Hawaii's balmy temperatures normally reach above 80 degrees Fahrenheit (27 C) at sea level on beaches such as Oahu's Waikiki but temperatures fall below freezing at the altitudes of tall mountain peaks on the Big Island. At 13,802 feet (4.2 km) Mauna Kea is Hawaii's tallest mountain. Snowfall is frequently seen on Mauna Kea's peak.
This year the Eastern Pacific Ocean continues to spawn significant tropical cyclones. Hurricane Loke formed southwest of the Hawaiian Islands on August 21, 2015 but Loke has not been a threat to Hawaii because it intensified to hurricane strength while moving well west of Hawaii over the open waters of the Pacific Ocean. The GPM core observatory satellite measured precipitation within the hurricane as it flew above the most powerful storms in the hurricane on August 2015 at 0116 UTC.
Rainfall associated with tropical depression Kilo recently dumped heavy rain in some areas of the state of Hawaii. Tropical depression Kilo changed course to move away from the Hawaiian Islands so it is no longer a threat but has recently been more energetic. The GPM core observatory satellite flew over on August 25, 2015 at 0121 UTC as Kilo approached Johnson Atoll and found that rainfall intensity had recently increased and the tropical depression's storm tops were very tall.