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🏛 Official alert Special Marine Warning Weather & disasters Serious

Special Marine Warning

N Issued by NWS Tiyan GU ⏳ In force until Mon 19 Oct, 05:00 📍 Guam Coastal Waters; Rota Coastal Waters (approximate) 🕑 2 h ago
🌐 Translate: ·

SMWGUM THE NATIONAL WEATHER SERVICE IN TIYAN GUAM HAS ISSUED A * SPECIAL MARINE WARNING FOR... GUAM COASTAL WATERS... * UNTIL NOON CHST. * AT 1109 AM CHST...A STRONG THUNDERSTORM WAS LOCATED OVER SOUTHEAST GUAM COASTAL WATERS, MOVING NORTH 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. …

🗃 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 ▾
⚠
SeveritySevere
⏱
UrgencyImmediate
❓
CertaintyLikely
EventSpecial Marine Warning
Response typeAvoid
CategoryMet
Affected areaGuam Coastal Waters; Rota Coastal Waters
Issuing authorityNWS Tiyan GU
ContactNot supplied

🕓 Alert timing · EAT

Sent2026-10-19T11:12:00+10:00
Effective2026-10-19T11:09:00+10:00
Onset2026-10-19T11:12:00+10:00
Expires2026-10-19T12:00:00+10:00

📋 Official instructions

MOVE TO SAFE HARBOR UNTIL HAZARDOUS WEATHER PASSES. MOVE TO SAFE HARBOR IMMEDIATELY AS GUSTY WINDS AND HIGH WAVES ARE EXPECTED.

📄 Message details

Alert identifierurn:oid:2.49.0.1.840.0.72c179377d9c445b84dda28dcc1439bd8286059f.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. MOVE TO SAFE HARBOR IMMEDIATELY AS GUSTY WINDS AND HIGH WAVES ARE EXPECTED.
  • 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 NOON CHST.
  • * AT 1109 AM CHST...A STRONG THUNDERSTORM WAS LOCATED OVER SOUTHEAST GUAM COASTAL WATERS, MOVING NORTH 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.
  • …
ⓘ News summary · read the original report for full context.

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