Special Marine Warning issued August 16 at 11:41PM ChST until August 17 at 12:15AM ChST by NWS Tiyan GU

SMWGUM THE NATIONAL WEATHER SERVICE IN TIYAN GUAM HAS ISSUED A * SPECIAL MARINE WARNING FOR... TINIAN COASTAL WATERS... * UNTIL 1215 AM CHST. * AT 1141 PM CHST...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING WATERSPOUTS WAS LOCATED OVER THE SOUTHERN COASTAL WATERS OF TINIAN AND MOVING NORTHWEST AROUND 5 KNOTS. HAZARD...WATERSPOUTS AND WIND GUSTS 34 KNOTS OR GREATER. SOURCE...RADAR. IMPACT...WATERSPOUTS CAN EASILY OVERTURN BOATS AND CREATE LOCALLY HAZARDOUS SEAS. SMALL CRAFT COULD BE DAMAGED IN BRIEFLY HIGHER WINDS AND SUDDENLY HIGHER WAVES. * THE SEVERE THUNDERSTORM WILL REMAIN OVER MAINLY OPEN WATERS.

What to do: MOVE TO SAFE HARBOR UNTIL HAZARDOUS WEATHER PASSES. MOVE TO SAFE HARBOR IMMEDIATELY AS GUSTY WINDS AND HIGH WAVES ARE EXPECTED. THUNDERSTORMS CAN PRODUCE SUDDEN WATERSPOUTS. WATERSPOUTS CAN EASILY OVERTURN BOATS AND CREATE LOCALLY HAZARDOUS SEAS. SEEK SAFE HARBOR IMMEDIATELY.

Issued by NWS Tiyan GU; in effect until Sun, 16 Aug 2026 14:15:00 GMT.

Source: National Weather Service (NOAA). Factual summary of a public release; not financial advice.

AI-assisted report. Disclosed per Moondial News integrity policy.