Guam: Flash flood warning in effect for Guam until at least 19:15 Sept. 16 /update 1

The US National Weather Service (NWS) has issued a flash flood warning for Guam until at least 19:15 Sept. 16. The warning covers the entire island. Officials could amend the warning for the impacted areas and/or extend it to the surrounding region on short notice over the coming hours.

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 stormwater drainage systems. Sites located 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.

Localized business disruptions may occur in low-lying areas; some businesses might not operate at full capacity because of flood damage to facilities, possible evacuations, and some employees' inability to reach work sites. Transport, electricity, and telecommunications disruptions are also possible in areas impacted by flooding.