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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, 03:30 📍 Guam 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 1030 AM CHST. * AT 945 AM CHST...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING WATERSPOUTS WAS LOCATED OVER EASTERN GUAM COASTAL WATERS ...MOVING NORTH AT 25 KNOTS. HAZARD...WIND GUSTS TO NEARLY 50 KNOTS AND FREQUENT LIGHTNING. WATERSPOUTS POSSIBLE. SOURCE...RADAR. IMPACT...W…

🗃 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
Issuing authorityNWS Tiyan GU
ContactNot supplied

🕓 Alert timing · EAT

Sent2026-10-19T09:48:00+10:00
Effective2026-10-19T09:47:00+10:00
Onset2026-10-19T09:48:00+10:00
Expires2026-10-19T10:30:00+10:00

📋 Official instructions

MOVE TO SAFE HARBOR IMMEDIATELY AS GUSTY WINDS AND HIGH WAVES ARE EXPECTED. FREQUENT LIGHTNING IS OCCURRING WITH THIS STORM. IF CAUGHT ON THE OPEN WATER STAY BELOW DECK IF POSSIBLE...KEEP AWAY FROM UNGROUNDED METAL OBJECTS. MOVE TO SAFE HARBOR IMMEDIATELY AS GUSTY WINDS AND HIGH WAVES ARE EXPECTED. FREQUENT LIGHTNING IS OCCURRING WITH THIS STORM. IF CAUGHT ON THE OPEN WATER STAY BELOW DECK IF POSSIBLE...KEEP AWAY FROM UNGROUNDED METAL OBJECTS.

📄 Message details

Alert identifierurn:oid:2.49.0.1.840.0.23ae83307aa8c261b5a5090b522490f8bed264f5.001.1
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 IMMEDIATELY AS GUSTY WINDS AND HIGH WAVES ARE EXPECTED. FREQUENT LIGHTNING IS OCCURRING WITH THIS STORM. IF CAUGHT ON THE OPEN WATER STAY BELOW DECK IF POSSIBLE...KEEP AWAY FROM UNGROUNDED METAL OBJECTS. MOVE TO SAFE HARBOR IMMEDIATELY AS GUSTY WINDS AND HIGH WAVES ARE EXPECTED. FREQUENT LIGHTNING IS OCCURRING WITH THIS STORM. IF CAUGHT ON THE OPEN WATER STAY BELOW DECK IF POSSIBLE...KEEP AWAY FROM UNGROUNDED METAL OBJECTS.
  • 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 1030 AM CHST.
  • * AT 945 AM CHST...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING WATERSPOUTS WAS LOCATED OVER EASTERN GUAM COASTAL WATERS ...MOVING NORTH AT 25 KNOTS.
  • HAZARD...WIND GUSTS TO NEARLY 50 KNOTS AND FREQUENT LIGHTNING.
  • WATERSPOUTS POSSIBLE.
  • SOURCE...RADAR.
  • IMPACT...W…
ⓘ News summary · read the original report for full context.

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