Alerts from NWS Guam (UNOFFICIAL)
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Alerts from NWS Guam (UNOFFICIAL)
@gum.nws-bot.us
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Unofficial bot sharing alerts from NWS Guam.

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Small Craft Advisory issued December 6 at 2:54AM ChST until December 7 at 3:00PM ChST by NWS Tiyan GU
Additional Details Here.
* WHAT...Northeast winds 15 to 25 kt and seas 8 to 12 feet. * WHERE...Majuro Coastal Waters. * WHEN...Until 3 PM ChST Sunday. * IMPACTS...Conditions will be hazardous to small craft.
December 5, 2025 at 5:00 PM
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Coastal Flood Advisory issued December 6 at 2:53AM ChST until December 7 at 3:00PM ChST by NWS Tiyan GU
Additional Details Here.
* WHAT...For the Coastal Flood Advisory, moderate coastal flooding. For the High Surf Advisory, large breaking waves of 10 to 13 feet. * WHERE...North and East facing reefs of Majuro. * WHEN...For the Coastal Flood Advisory, until 3 PM ChST Sunday. For the High Surf Advisory, from 7 AM Saturday to 3 PM ChST Sunday. * IMPACTS...Flooding of lots, parks, and roads with only isolated road closures expected. Dangerous swimming and surfing conditions and localized beach erosion. * ADDITIONAL DETAILS...A building trade-wind swell is moving into the Marshall Islands, leading to hazardous surf of 12 feet for north and east facing reefs. The increased swell combined with the King Tide will lead to moderate coastal flooding. * WHAT...For the Coastal Flood Advisory, moderate coastal flooding. For the High Surf Advisory, large breaking waves of 10 to 13 feet. * WHERE...North and East facing reefs of Majuro. * WHEN...For the Coastal Flood Advisory, until 3 PM ChST Sunday. For the High Surf Advisory, from 7 AM Saturday to 3 PM ChST Sunday. * IMPACTS...Flooding of lots, parks, and roads with only isolated road closures expected. Dangerous swimming and surfing conditions and localized beach erosion. * ADDITIONAL DETAILS...A building trade-wind swell is moving into the Marshall Islands, leading to hazardous surf of 12 feet for north and east facing reefs. The increased swell combined with the King Tide will lead to moderate coastal flooding. * WHAT...Large breaking waves of 7 to 9 feet. * WHERE...East facing reefs of Kosrae. * WHEN...Until 3 PM ChST Sunday. * IMPACTS...Dangerous swimming and surfing conditions and localized beach erosion. * ADDITIONAL DETAILS...The long-period north swell has diminished and hazardous surf has fallen along north facing reefs. Surf will remain elevated along east facing reefs through Sunday. Hazardous surf could return to north facing reefs Sunday or Sunday night as the trade swell builds.
December 5, 2025 at 5:00 PM
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GUM issues Area Forecast Discussion (AFD) at Dec 5, 5:20 PM CHST
at Fri, 05 Dec 2025 08:20:29 +0000 via IEMbot
Additional Details Here.
December 5, 2025 at 8:28 AM
gum.nws-bot.us
GUM continues Coastal Flood Advisory for Chuuk Lagoon [FM] till Dec 6, 4:00 PM CHST
at Fri, 05 Dec 2025 06:38:18 +0000 via IEMbot
Additional Details Here.
December 5, 2025 at 6:48 AM
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High Surf Advisory issued December 5 at 4:38PM ChST until December 8 at 5:00AM ChST by NWS Tiyan GU
Additional Details Here.(2/2)
* WHAT...Minor coastal flooding 1 to 2 feet. * WHERE...North and east facing reefs of Chuuk. * WHEN...Until 5 PM ChST Saturday. * IMPACTS...Flooding of lots, parks, and roads with only isolated road closures expected. * ADDITIONAL DETAILS...A long-period north swell combined with above normal King Tides will produce moderate coastal flooding during high tide into the weekend. If the north swell remains longer than expected, flooding could continue into Sunday. High tides will begin to decrease Sunday afternoon.
December 5, 2025 at 6:45 AM
gum.nws-bot.us
High Surf Advisory issued December 5 at 4:38PM ChST until December 8 at 5:00AM ChST by NWS Tiyan GU
Additional Details Here.
(1/2)
* WHAT...For the High Surf Advisory, large breaking waves of 7 to 9 feet. For the Coastal Flood Statement, isolated minor coastal flooding up to 1 foot. * WHERE...North facing reefs of Yap. * WHEN...From 5 AM Saturday to 5 AM ChST Monday. * IMPACTS...Some water on low lying roads and property. Dangerous swimming and surfing conditions and localized beach erosion. * ADDITIONAL DETAILS...A building north swell combined with a northeast trade swell will produce hazardous surf along north facing reefs. The surf combined with above normal King Tides will produce minor coastal flooding during high tide along north facing reefs. * WHAT...For the High Surf Advisory, large breaking waves of 7 to 9 feet. For the Coastal Flood Statement, isolated minor coastal flooding up to 1 foot. * WHERE...North facing reefs of Yap. * WHEN...From 5 AM Saturday to 5 AM ChST Monday. * IMPACTS...Some water on low lying roads and property. Dangerous swimming and surfing conditions and localized beach erosion. * ADDITIONAL DETAILS...A building north swell combined with a northeast trade swell will produce hazardous surf along north facing reefs. The surf combined with above normal King Tides will produce minor coastal flooding during high tide along north facing reefs. * WHAT...For the High Surf Advisory, large breaking waves of 7 to 9 feet. For the Coastal Flood Statement, isolated minor coastal flooding expected. * WHERE...North facing reefs of Palau. * WHEN...From 5 AM Saturday to 5 PM ChST Sunday. * IMPACTS...Some water on low lying roads and property. Dangerous swimming and surfing conditions and localized beach erosion. * ADDITIONAL DETAILS...A building north swell combined with a northeast trade swell will produce hazardous surf along north facing reefs. The surf combined with above normal King Tides will produce minor coastal flooding during high tide along north facing reefs. * WHAT...For the High Surf Advisory, large breaking waves of 7 to 9 feet. For the Coastal Flood Statement, isolated minor coastal flooding expected. * WHERE...North facing reefs of Palau. * WHEN...From 5 AM Saturday to 5 PM ChST Sunday. * IMPACTS...Some water on low lying roads and property. Dangerous swimming and surfing conditions and localized beach erosion. * ADDITIONAL DETAILS...A building north swell combined with a northeast trade swell will produce hazardous surf along north facing reefs. The surf combined with above normal King Tides will produce minor coastal flooding during high tide along north facing reefs.
December 5, 2025 at 6:45 AM
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GUM issues Airport Weather Warning (AWW) at Dec 5, 2:32 PM CHST
at Fri, 05 Dec 2025 05:32:17 +0000 via IEMbot
Additional Details Here.
December 5, 2025 at 5:48 AM
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GUM issues High Surf Advisory valid at Dec 6, 6:00 AM CHST for Majuro [MH] till Dec 7, 2:00 PM CHST
at Fri, 05 Dec 2025 04:58:48 +0000 via IEMbot
Additional Details Here.
December 5, 2025 at 5:08 AM
gum.nws-bot.us
GUM cancels High Surf Advisory for Pohnpei [FM]
at Fri, 05 Dec 2025 04:58:48 +0000 via IEMbot
Additional Details Here.
December 5, 2025 at 5:08 AM
gum.nws-bot.us
High Surf Advisory issued December 5 at 2:58PM ChST until December 7 at 3:00PM ChST by NWS Tiyan GU
Additional Details Here.
* WHAT...For the Coastal Flood Advisory, moderate coastal flooding. For the High Surf Advisory, large breaking waves of 10 to 13 feet. * WHERE...North and East facing reefs of Majuro. * WHEN...For the Coastal Flood Advisory, until 3 PM ChST Sunday. For the High Surf Advisory, from 7 AM Saturday to 3 PM ChST Sunday. * IMPACTS...Flooding of lots, parks, and roads with only isolated road closures expected. Dangerous swimming and surfing conditions and localized beach erosion. * ADDITIONAL DETAILS...A trade-wind swell will move into the Marshall. Islands by Saturday morning, leading to hazardous surf of 12 feet for north and east facing reefs. The increased swell combined with the King Tide will lead to moderate coastal flooding. * WHAT...For the Coastal Flood Advisory, moderate coastal flooding. For the High Surf Advisory, large breaking waves of 10 to 13 feet. * WHERE...North and East facing reefs of Majuro. * WHEN...For the Coastal Flood Advisory, until 3 PM ChST Sunday. For the High Surf Advisory, from 7 AM Saturday to 3 PM ChST Sunday. * IMPACTS...Flooding of lots, parks, and roads with only isolated road closures expected. Dangerous swimming and surfing conditions and localized beach erosion. * ADDITIONAL DETAILS...A trade-wind swell will move into the Marshall. Islands by Saturday morning, leading to hazardous surf of 12 feet for north and east facing reefs. The increased swell combined with the King Tide will lead to moderate coastal flooding. * WHAT...Large breaking waves of 7 to 9 feet. * WHERE...East facing reefs of Kosrae. * WHEN...Until 3 PM ChST Sunday. * IMPACTS...Dangerous swimming and surfing conditions and localized beach erosion. * ADDITIONAL DETAILS...The long-period north swell has diminished and hazardous surf has fallen along north facing reefs. Surf will remain elevated along east facing reefs through Sunday. Hazardous surf could return to north facing reefs Sunday or Sunday night as a trade-wind swell moves into the region.
December 5, 2025 at 5:00 AM
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Small Craft Advisory issued December 5 at 2:58PM ChST until December 7 at 3:00PM ChST by NWS Tiyan GU
Additional Details Here.
* WHAT...Northeast winds 15 to 25 kt and seas 8 to 12 feet expected. * WHERE...Majuro Coastal Waters. * WHEN...Until 3 PM ChST Sunday. * IMPACTS...Conditions will be hazardous to small craft.
December 5, 2025 at 5:00 AM
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GUM issues Airport Weather Warning (AWW) at Dec 5, 11:54 AM CHST
at Fri, 05 Dec 2025 02:54:43 +0000 via IEMbot
Additional Details Here.
December 5, 2025 at 3:07 AM
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GUM issues Area Forecast Discussion (AFD) at Dec 5, 5:21 AM CHST
at Thu, 04 Dec 2025 20:22:10 +0000 via IEMbot
Additional Details Here.
December 4, 2025 at 8:27 PM
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Coastal Flood Advisory issued December 5 at 4:44AM ChST until December 6 at 5:00PM ChST by NWS Tiyan GU
Additional Details Here.
* WHAT...Minor coastal flooding up to a foot. * WHERE...North and east facing reefs of Chuuk. * WHEN...Until 5 PM ChST Saturday. * IMPACTS...Flooding of lots, parks, and roads with only isolated road closures expected. * ADDITIONAL DETAILS...A long-period north swell combined with above normal King Tides will produce minor coastal flooding during high tide into the weekend. If the north swell remains longer than expected, flooding could continue into Sunday. High tides will begin to decrease Sunday afternoon.
December 4, 2025 at 7:00 PM
gum.nws-bot.us
GUM continues Coastal Flood Advisory for Chuuk Lagoon [FM] till Dec 6, 4:00 PM CHST
at Thu, 04 Dec 2025 18:44:38 +0000 via IEMbot
Additional Details Here.
December 4, 2025 at 6:48 PM
gum.nws-bot.us
GUM issues Airport Weather Warning (AWW) at Dec 5, 3:27 AM CHST
at Thu, 04 Dec 2025 18:27:43 +0000 via IEMbot
Additional Details Here.
December 4, 2025 at 6:28 PM
gum.nws-bot.us
GUM continues Coastal Flood Advisory for Majuro [MH] till Dec 6, 3:00 PM CHST
at Thu, 04 Dec 2025 16:51:06 +0000 via IEMbot
Additional Details Here.
December 4, 2025 at 5:08 PM
gum.nws-bot.us
Coastal Flood Advisory issued December 5 at 2:50AM ChST until December 6 at 4:00PM ChST by NWS Tiyan GU
Additional Details Here.
* WHAT...Moderate coastal flooding. * WHERE...North and east facing shorelines of Majuro. * WHEN...Through Saturday afternoon. * IMPACTS...Flooding of lots, parks, and roads with only isolated road closures expected. * ADDITIONAL DETAILS...Tide predictions show increasing wave run up across Majuro due a combination of the lunar cycle, long-period north swell, and elevated trade swell. Moderate coastal flooding is expected through at least Saturday afternoon. High tides will still be elevated into early next week, and wave models show another pulse of northerly swell generated by a system east of Japan, and the northeast swell staying elevated. This may extend the potential for coastal inundation into next week. Corrected minor typo. ...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 4 PM CHST THIS AFTERNOON... * WHAT...Large breaking waves of 7 to 9 feet. * WHERE...North and east facing reefs of Kosrae. North facing reefs of Pohnpei. * WHEN...Until 4 PM ChST this afternoon. * IMPACTS...Dangerous swimming and surfing conditions and localized beach erosion. * ADDITIONAL DETAILS...A long period northerly swell emanating from a distant weather system combined with a large northeast trade swell continue to produce hazardous surf conditions for Pohnpei and Kosrae. Buoy data near Pohnpei and Kosrae show the northerly swell is slowly decreasing but the northeast swell is still elevated. Model guidance supports that the north swell will subside slightly and then rebuild Saturday night or Sunday as another pulse is generated by a system east of Japan, with the primary northeast swell staying elevated. While surf may briefly drop below hazardous levels of 9 feet along north facing reefs (Pohnpei & Kosrae) and 8 feet along east facing reefs (Kosrae) Friday night and Saturday, high surf is expected to return Saturday night or Sunday.
December 4, 2025 at 5:00 PM
gum.nws-bot.us
GUM continues High Surf Advisory for Kosrae, Pohnpei [FM] till Dec 5, 3:00 PM CHST
at Thu, 04 Dec 2025 16:45:13 +0000 via IEMbot
Additional Details Here.
December 4, 2025 at 4:48 PM
gum.nws-bot.us
GUM issues Area Forecast Discussion (AFD) at Dec 4, 7:33 PM CHST
at Thu, 04 Dec 2025 10:34:03 +0000 via IEMbot
Additional Details Here.
December 4, 2025 at 10:48 AM
gum.nws-bot.us
GUM issues Area Forecast Discussion (AFD) at Dec 4, 5:34 PM CHST
at Thu, 04 Dec 2025 08:34:21 +0000 via IEMbot
Additional Details Here.
December 4, 2025 at 8:48 AM
gum.nws-bot.us
Coastal Flood Advisory issued December 4 at 5:19PM ChST until December 6 at 5:00PM ChST by NWS Tiyan GU
Additional Details Here.
* WHAT...Minor coastal flooding expected. * WHERE...North and east facing reefs of Chuuk. * WHEN...From 5 PM this afternoon to 5 PM ChST Saturday. * IMPACTS...Flooding of lots, parks, and roads with only isolated road closures expected. * ADDITIONAL DETAILS...A long-period north swell combined with above normal King Tides will produce minor coastal flooding during high tide into the weekend. If the north swell remains longer than expected, flooding could continue into Sunday. High tides will begin to decrease Sunday afternoon.
December 4, 2025 at 7:30 AM
gum.nws-bot.us
GUM continues Coastal Flood Advisory for Chuuk Lagoon [FM] till Dec 6, 4:00 PM CHST
at Thu, 04 Dec 2025 07:19:16 +0000 via IEMbot
Additional Details Here.
December 4, 2025 at 7:28 AM
gum.nws-bot.us
GUM upgrades Coastal Flood Statement to Coastal Flood Advisory for Majuro [MH] till Dec 6, 3:00 PM CHST
at Thu, 04 Dec 2025 04:52:38 +0000 via IEMbot
Additional Details Here.
December 4, 2025 at 5:08 AM
gum.nws-bot.us
GUM continues High Surf Advisory for Kosrae, Pohnpei [FM] till Dec 5, 3:00 PM CHST
at Thu, 04 Dec 2025 04:52:38 +0000 via IEMbot
Additional Details Here.
December 4, 2025 at 5:08 AM