Coastal Flood Watch

In force from

Oct 17, 5:00 PM ChST

Until

Oct 19, 4:00 AM ChST

Issued

Oct 16, 3:12 PM ChST

Office

Tiyan, GU

Number

6 of its kind from this office this year

Severity

Moderate, Future, Possible

Where

Guam Northern Marianas

HIGH SURF WARNING IN EFFECT FROM 5 PM SATURDAY TO 4 AM CHST MONDAY... ...COASTAL FLOOD WATCH IN EFFECT FROM SATURDAY AFTERNOON THROUGH LATE SUNDAY NIGHT

What

For the High Surf Warning, dangerously large breaking waves of 7 to 9 feet Saturday afternoon, building to as high as 26 feet for Guam, 20 feet for Rota and 19 feet for Tinian and Saipan. For the Coastal Flood Watch, significant coastal flooding possible.

Where

For the High Surf Warning, initially east facing reefs of Guam, Rota, Tinian and Saipan; spreading to south facing reefs through Sunday afternoon. For the Coastal Flood Watch, all reefs of the Marianas.

When

For the High Surf Warning, from 5 PM Saturday to 4 AM ChST Monday. For the Coastal Flood Watch, from Saturday afternoon through late Sunday night.

Impacts

Numerous roads may be closed. Low lying property including homes, businesses, and some critical infrastructure may be inundated. Some shoreline erosion may occur. Breaking waves can sweep people off jetties and docks, and into dangerous seas. Life- threatening swimming conditions and significant beach erosion can be expected. Coastal inundation of up to 5 feet for Guam, 2 to 4 feet for Rota and 1 to 3 feet for Tinian and Saipan is possible. Coastal flooding and beach erosion is possible.

Additional details

As TS Champi approaches the Marianas, surf conditions are expected to deteriorate rapidly, with surf reaching 9 feet Saturday afternoon, building to dangerous/deadly levels through Saturday night.

What to do

Everyone should remain out of the water due to life-threatening surf conditions. Stay off of jetties, piers, and other waterside infrastructure.

Read the platesCoastal flood FB-EVT-105Nor'easter FB-EVT-066Moon and tides FB-CLK-003How to read a warning FB-STN-001

On the radarForecast wind over itRadar