Special Marine Warning
N
Issued by NWS Tiyan GU
⏳ In force until Sun 18 Oct, 11:45 📍 Guam Coastal Waters (approximate) 🕑 3 h ago
SMWGUM THE NATIONAL WEATHER SERVICE IN TIYAN HAS ISSUED A * SPECIAL MARINE WARNING FOR... SOUTHEASTERN GUAM COASTAL WATERS... * UNTIL 645 PM CHST. * AT 626 PM CHST, A SEVERE THUNDERSTORM PRODUCING WATERSPOUTS WAS LOCATED 30 NM SOUTHEAST OF IPAN BUOY, MOVING NORTH AT 30 KNOTS. HAZARD...WATERSPOUTS. SOURCE...RADAR INDICATED. IMPACT...WATERSPOUTS CAN EASILY OVERTURN BOATS AND CREATE LOCALLY HAZARDOU…
🗃 Archived report - it is no longer on the live map. Pages are kept for 30 days.
📡 CAP alert details
Common Alerting Protocol
Official alert linked
▾
📡 CAP alert details
Common Alerting Protocol
⚠
SeveritySevere
⏱
UrgencyImmediate
❓
CertaintyLikely
EventSpecial Marine Warning
Response typeAvoid
CategoryMet
Affected areaGuam Coastal Waters
Issuing authorityNWS Tiyan GU
ContactNot supplied
🕓 Alert timing · EAT
Sent2026-10-18T18:26:00+10:00
Effective2026-10-18T18:26:00+10:00
Onset2026-10-18T18:26:00+10:00
Expires2026-10-18T18:45:00+10:00
📋 Official instructions
MOVE TO SAFE HARBOR UNTIL HAZARDOUS WEATHER PASSES.📄 Message details
Alert identifierurn:oid:2.49.0.1.840.0.80f2f127c9c7abfed7904ad06c52844882707e33.001.1
Message typeAlert
Senderw-nws.webmaster@noaa.gov
ScopePublic
CAP statusActual
Related messagesNot supplied
ⓘ CAP fields populate when an official alert is linked.
🛡 Safety advice
General guidance for this type of incident - not official instructions.
- MOVE TO SAFE HARBOR UNTIL HAZARDOUS WEATHER PASSES.
- Stay aware of your surroundings in this area.
- Follow official updates from the police and local authorities.
- In an emergency call 112 (police) or 112 (ambulance), or request help through Jilinde.
📰 Story summary
From the report shown in the feed:
- SMWGUM THE NATIONAL WEATHER SERVICE IN TIYAN HAS ISSUED A * SPECIAL MARINE WARNING FOR...
- SOUTHEASTERN GUAM COASTAL WATERS...
- * UNTIL 645 PM CHST.
- * AT 626 PM CHST, A SEVERE THUNDERSTORM PRODUCING WATERSPOUTS WAS LOCATED 30 NM SOUTHEAST OF IPAN BUOY, MOVING NORTH AT 30 KNOTS.
- HAZARD...WATERSPOUTS.
- SOURCE...RADAR INDICATED.
- IMPACT...WATERSPOUTS CAN EASILY OVERTURN BOATS AND CREATE LOCALLY HAZARDOU…
ⓘ News summary · read the original report for full context.
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