US: Adverse weather forecast to continue across much of Hawaii through at least Dec. 1 /update 1

Severe weather is forecast to continue across much of Hawaii through at least Dec. 1. A weather system known in Hawaii as a Kona low that has brought heavy rainfall in recent days is expected to continue to bring downpours in many areas Dec. 1. Flooding has been reported in parts of eastern Hawaii Island and roads have been closed on Maui Nov. 30. Further flooding is possible Dec. 1, especially in areas where river levels are high and the ground is already saturated. As of late Nov. 30, the National Weather Service (NWS) has issued flash flood watches across Hawaii through the afternoon Dec. 1. A winter weather advisory is also in place for Big Island summits and a special weather statement has been issued for gusty winds and showers on the southeast slopes of Big Island overnight Nov. 30-Dec. 1. Authorities will likely issue new alerts or update/rescind existing advisories as weather conditions change over the coming days.

Sustained heavy rainfall could trigger flooding in low-lying communities near rivers, streams, and creeks. Urban flooding is also possible in developed areas with easily overwhelmed or a lack of stormwater drainage systems. Sites downstream from large reservoirs or rivers may be subject to flash flooding after relatively short periods of intense rainfall. Landslides are possible in hilly or mountainous areas, especially where heavy rain has saturated the soil. Disruptions to electricity and telecommunications services are possible where significant flooding, strong winds, or landslides impact utility networks.

Floodwaters and debris flows may render some bridges, rail networks, or roadways impassable, impacting overland travel in and around affected areas. Ponding on road surfaces could cause hazardous driving conditions on regional highways. Authorities could temporarily close some low-lying routes that become inundated by floodwaters.

Severe weather could also trigger flight delays and cancellations at airports in the affected regions. Flooding could block regional rail lines; passenger train delays and cancellations are possible in areas with heavy rainfall and potential track inundation.

Localized business disruptions may occur in low-lying areas; some businesses might not operate at full capacity because of flood damage to facilities and some employees' inability to reach work sites.