Special Marine Warning
N
Issued by NWS Tiyan GU
⏳ In force until Sun 18 Oct, 12:00 📍 Guam Coastal Waters (approximate) 🕑 2 h ago
SMWGUM THE NATIONAL WEATHER SERVICE IN TIYAN GUAM HAS ISSUED A * SPECIAL MARINE WARNING FOR... GUAM COASTAL WATERS... * UNTIL 700 PM CHST. * AT 634 PM CHST...A SHOWER WAS LOCATED OVER NORTHERN GUAM WATERS MOVING NORTHWEST AT 35 KNOTS. HAZARD...WIND GUSTS 34 KNOTS OR GREATER. SOURCE...RADAR. IMPACT...SMALL CRAFT COULD BE DAMAGED IN BRIEFLY HIGHER WINDS AND SUDDENLY HIGHER WAVES. * THE SHOWER WILL …
🗃 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
Sent2026-10-18T18:35:00+10:00
Effective2026-10-18T18:34:00+10:00
Onset2026-10-18T18:35:00+10:00
Expires2026-10-18T19:00:00+10:00
📋 Official instructions
WATERSPOUTS CAN EASILY OVERTURN BOATS AND CREATE LOCALLY HAZARDOUS SEAS. SEEK SAFE HARBOR IMMEDIATELY.📄 Message details
Alert identifierurn:oid:2.49.0.1.840.0.f8ebb5a29eeafe1566f568c74668148d8ccf2f6d.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.
- WATERSPOUTS CAN EASILY OVERTURN BOATS AND CREATE LOCALLY HAZARDOUS SEAS. SEEK SAFE HARBOR IMMEDIATELY.
- 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 GUAM HAS ISSUED A * SPECIAL MARINE WARNING FOR...
- GUAM COASTAL WATERS...
- * UNTIL 700 PM CHST.
- * AT 634 PM CHST...A SHOWER WAS LOCATED OVER NORTHERN GUAM WATERS MOVING NORTHWEST AT 35 KNOTS.
- HAZARD...WIND GUSTS 34 KNOTS OR GREATER.
- SOURCE...RADAR.
- IMPACT...SMALL CRAFT COULD BE DAMAGED IN BRIEFLY HIGHER WINDS AND SUDDENLY HIGHER WAVES.
- * THE SHOWER WILL …
ⓘ News summary · read the original report for full context.
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