Active Weather Alerts
Coastal Flood Statement
Issued: 2:11 AM Aug. 23, 2025 – National Weather Service
...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT SATURDAY... ...COASTAL FLOOD STATEMENT REMAINS IN EFFECT UNTIL 2 AM EDT SATURDAY... * WHAT...For the High Surf Advisory, large breaking waves of 6 to 13 feet in the surf zone. For the Coastal Flood Statement, up to one half foot of inundation above ground level in low- lying areas near shorelines and tidal waterways (4.2 to 12.2 feet Mean Lower Low Water). * WHERE...Cape Cod. * WHEN...For the High Surf Advisory, until 8 PM EDT Saturday. For the Coastal Flood Statement, until 2 AM EDT Saturday. * IMPACTS...Some water on low lying roads and property. Dangerous swimming and surfing conditions and localized beach erosion. PRECAUTIONARY/PREPAREDNESS ACTIONS... Do not drive through flooded roadways. Inexperienced swimmers should remain out of the water due to dangerous surf conditions. && && Time of high total tides are approximate to the nearest hour. Buzzards Bay at Woods Hole MLLW Categories - Minor 5.5 ft, Moderate 7.0 ft, Major 8.5 ft MHHW Categories - Minor 3.5 ft, Moderate 5.0 ft, Major 6.5 ft Total Total Departure Day/Time Tide Tide from Norm Waves Flood ft MLLW ft MHHW ft ft Impact -------- --------- --------- --------- ------- -------- 23/08 AM 3.0/ 3.5 1.0/ 1.5 1.0/ 1.5 2 None 23/09 PM 2.8/ 3.4 0.9/ 1.4 0.5/ 1.0 2 None 24/09 AM 2.6/ 3.1 0.6/ 1.1 0.4/ 0.9 2 None 24/10 PM 2.7/ 3.2 0.7/ 1.1 0.4/ 0.9 2 None 25/10 AM 2.7/ 3.2 0.7/ 1.1 0.4/ 0.9 2 None Chatham MA - East Coast MLLW Categories - Minor 9.0 ft, Moderate 11.5 ft, Major 13.0 ft MHHW Categories - Minor 3.8 ft, Moderate 6.3 ft, Major 7.8 ft Total Total Departure Day/Time Tide Tide from Norm Waves Flood ft MLLW ft MHHW ft ft Impact -------- --------- --------- --------- ------- -------- 22/11 PM 6.2/ 6.8 1.1/ 1.6 1.3/ 1.8 6-7 None 23/01 PM 5.7/ 6.2 0.5/ 1.0 0.7/ 1.1 5-6 None 24/12 AM 5.5/ 6.0 0.2/ 0.8 0.5/ 1.0 4 None 24/01 PM 5.5/ 6.0 0.2/ 0.8 0.5/ 1.0 4 None 25/01 AM 5.5/ 6.0 0.2/ 0.8 0.5/ 1.0 3 None 25/02 PM 5.4/ 5.9 0.2/ 0.7 0.4/ 0.9 2 None Chatham - South side MLLW Categories - Minor 9.0 ft, Moderate 10.5 ft, Major 11.5 ft MHHW Categories - Minor 4.5 ft, Moderate 6.0 ft, Major 7.0 ft Total Total Departure Day/Time Tide Tide from Norm Waves Flood ft MLLW ft MHHW ft ft Impact -------- --------- --------- --------- ------- -------- 23/01 AM 6.0/ 6.5 1.5/ 2.0 1.3/ 1.8 5 None 23/01 PM 4.7/ 5.2 0.2/ 0.7 0.9/ 1.4 4-5 None 24/01 AM 4.7/ 5.2 0.2/ 0.8 0.2/ 0.8 3-4 None 24/02 PM 4.7/ 5.2 0.2/ 0.7 0.8/ 1.3 3 None 25/02 AM 5.1/ 5.6 0.6/ 1.1 0.8/ 1.3 3 None 25/02 PM 4.2/ 4.7 -0.2/ 0.2 0.4/ 0.9 2 None Provincetown Harbor MLLW Categories - Minor 13.0 ft, Moderate 14.0 ft, Major 15.0 ft MHHW Categories - Minor 2.9 ft, Moderate 3.9 ft, Major 4.9 ft Total Total Departure Day/Time Tide Tide from Norm Waves Flood ft MLLW ft MHHW ft ft Impact -------- --------- --------- --------- ------- -------- 23/12 AM 11.7/12.2 1.6/ 2.0 1.3/ 1.8 5 None 23/12 PM 10.2/10.7 0.1/ 0.6 0.8/ 1.3 4 None 24/12 AM 10.9/11.4 0.8/ 1.3 0.6/ 1.1 4 None 24/01 PM 10.3/10.8 0.2/ 0.7 0.7/ 1.1 3 None 25/01 AM 10.9/11.4 0.8/ 1.3 0.7/ 1.1 2-3 None 25/01 PM 10.1/10.6 0.0/ 0.5 0.7/ 1.1 2 None Dennis - Sesuit Harbor MLLW Categories - Minor 13.0 ft, Moderate 14.5 ft, Major 16.0 ft MHHW Categories - Minor 2.5 ft, Moderate 4.0 ft, Major 5.5 ft Total Total Departure Day/Time Tide Tide from Norm Waves Flood ft MLLW ft MHHW ft ft Impact -------- --------- --------- --------- ------- -------- 23/12 AM 12.2/12.7 1.7/ 2.2 1.3/ 1.8 3 None 23/12 PM 10.8/11.3 0.2/ 0.8 0.9/ 1.4 3 None 24/12 AM 11.4/11.9 0.9/ 1.4 0.7/ 1.1 2 None 24/01 PM 11.3/11.8 0.8/ 1.3 1.2/ 1.7 2-3 None 25/01 AM 11.8/12.3 1.3/ 1.8 1.2/ 1.7 2 None 25/01 PM 10.7/11.2 0.2/ 0.7 0.8/ 1.3 2 None Sandwich Harbor MLLW Categories - Minor 12.0 ft, Moderate 14.0 ft, Major 15.0 ft MHHW Categories - Minor 1.7 ft, Moderate 3.7 ft, Major 4.7 ft Total Total Departure Day/Time Tide Tide from Norm Waves Flood ft MLLW ft MHHW ft ft Impact -------- --------- --------- --------- ------- -------- 22/11 PM 10.6/11.1 0.2/ 0.8 1.4/ 1.9 2 None 23/12 PM 9.1/ 9.6 -1.3/-0.8 0.8/ 1.3 1-3 None 24/12 AM 9.7/10.2 -0.7/-0.2 0.6/ 1.1 2 None 24/01 PM 9.7/10.2 -0.7/-0.2 1.2/ 1.7 2-3 None 25/01 AM 10.2/10.7 -0.2/ 0.3 1.2/ 1.7 2 None 25/01 PM 9.2/ 9.7 -1.1/-0.7 0.8/ 1.3 2 None Wings Neck MLLW Categories - Minor 6.5 ft, Moderate 9.0 ft, Major 11.5 ft MHHW Categories - Minor 2.1 ft, Moderate 4.6 ft, Major 7.1 ft Total Total Departure Day/Time Tide Tide from Norm Waves Flood ft MLLW ft MHHW ft ft Impact -------- --------- --------- --------- ------- -------- 22/09 PM 6.0/ 6.5 1.6/ 2.0 1.6/ 2.0 1 Minor 23/09 AM 5.2/ 5.7 0.9/ 1.4 1.1/ 1.6 1-2 None 23/09 PM 5.1/ 5.6 0.7/ 1.1 0.7/ 1.1 2 None 24/10 AM 4.7/ 5.2 0.2/ 0.8 0.4/ 0.9 2-3 None 24/10 PM 4.7/ 5.2 0.2/ 0.8 0.4/ 0.9 2 None 25/10 AM 4.7/ 5.2 0.2/ 0.8 0.5/ 1.0 2 None &&
High Surf Advisory
Issued: 2:11 AM Aug. 23, 2025 – National Weather Service
...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT SATURDAY... ...COASTAL FLOOD STATEMENT REMAINS IN EFFECT UNTIL 2 AM EDT SATURDAY... * WHAT...For the High Surf Advisory, large breaking waves of 6 to 13 feet in the surf zone. For the Coastal Flood Statement, up to one half foot of inundation above ground level in low- lying areas near shorelines and tidal waterways (4.2 to 12.2 feet Mean Lower Low Water). * WHERE...Cape Cod. * WHEN...For the High Surf Advisory, until 8 PM EDT Saturday. For the Coastal Flood Statement, until 2 AM EDT Saturday. * IMPACTS...Some water on low lying roads and property. Dangerous swimming and surfing conditions and localized beach erosion. PRECAUTIONARY/PREPAREDNESS ACTIONS... Do not drive through flooded roadways. Inexperienced swimmers should remain out of the water due to dangerous surf conditions. && && Time of high total tides are approximate to the nearest hour. Buzzards Bay at Woods Hole MLLW Categories - Minor 5.5 ft, Moderate 7.0 ft, Major 8.5 ft MHHW Categories - Minor 3.5 ft, Moderate 5.0 ft, Major 6.5 ft Total Total Departure Day/Time Tide Tide from Norm Waves Flood ft MLLW ft MHHW ft ft Impact -------- --------- --------- --------- ------- -------- 23/08 AM 3.0/ 3.5 1.0/ 1.5 1.0/ 1.5 2 None 23/09 PM 2.8/ 3.4 0.9/ 1.4 0.5/ 1.0 2 None 24/09 AM 2.6/ 3.1 0.6/ 1.1 0.4/ 0.9 2 None 24/10 PM 2.7/ 3.2 0.7/ 1.1 0.4/ 0.9 2 None 25/10 AM 2.7/ 3.2 0.7/ 1.1 0.4/ 0.9 2 None Chatham MA - East Coast MLLW Categories - Minor 9.0 ft, Moderate 11.5 ft, Major 13.0 ft MHHW Categories - Minor 3.8 ft, Moderate 6.3 ft, Major 7.8 ft Total Total Departure Day/Time Tide Tide from Norm Waves Flood ft MLLW ft MHHW ft ft Impact -------- --------- --------- --------- ------- -------- 22/11 PM 6.2/ 6.8 1.1/ 1.6 1.3/ 1.8 6-7 None 23/01 PM 5.7/ 6.2 0.5/ 1.0 0.7/ 1.1 5-6 None 24/12 AM 5.5/ 6.0 0.2/ 0.8 0.5/ 1.0 4 None 24/01 PM 5.5/ 6.0 0.2/ 0.8 0.5/ 1.0 4 None 25/01 AM 5.5/ 6.0 0.2/ 0.8 0.5/ 1.0 3 None 25/02 PM 5.4/ 5.9 0.2/ 0.7 0.4/ 0.9 2 None Chatham - South side MLLW Categories - Minor 9.0 ft, Moderate 10.5 ft, Major 11.5 ft MHHW Categories - Minor 4.5 ft, Moderate 6.0 ft, Major 7.0 ft Total Total Departure Day/Time Tide Tide from Norm Waves Flood ft MLLW ft MHHW ft ft Impact -------- --------- --------- --------- ------- -------- 23/01 AM 6.0/ 6.5 1.5/ 2.0 1.3/ 1.8 5 None 23/01 PM 4.7/ 5.2 0.2/ 0.7 0.9/ 1.4 4-5 None 24/01 AM 4.7/ 5.2 0.2/ 0.8 0.2/ 0.8 3-4 None 24/02 PM 4.7/ 5.2 0.2/ 0.7 0.8/ 1.3 3 None 25/02 AM 5.1/ 5.6 0.6/ 1.1 0.8/ 1.3 3 None 25/02 PM 4.2/ 4.7 -0.2/ 0.2 0.4/ 0.9 2 None Provincetown Harbor MLLW Categories - Minor 13.0 ft, Moderate 14.0 ft, Major 15.0 ft MHHW Categories - Minor 2.9 ft, Moderate 3.9 ft, Major 4.9 ft Total Total Departure Day/Time Tide Tide from Norm Waves Flood ft MLLW ft MHHW ft ft Impact -------- --------- --------- --------- ------- -------- 23/12 AM 11.7/12.2 1.6/ 2.0 1.3/ 1.8 5 None 23/12 PM 10.2/10.7 0.1/ 0.6 0.8/ 1.3 4 None 24/12 AM 10.9/11.4 0.8/ 1.3 0.6/ 1.1 4 None 24/01 PM 10.3/10.8 0.2/ 0.7 0.7/ 1.1 3 None 25/01 AM 10.9/11.4 0.8/ 1.3 0.7/ 1.1 2-3 None 25/01 PM 10.1/10.6 0.0/ 0.5 0.7/ 1.1 2 None Dennis - Sesuit Harbor MLLW Categories - Minor 13.0 ft, Moderate 14.5 ft, Major 16.0 ft MHHW Categories - Minor 2.5 ft, Moderate 4.0 ft, Major 5.5 ft Total Total Departure Day/Time Tide Tide from Norm Waves Flood ft MLLW ft MHHW ft ft Impact -------- --------- --------- --------- ------- -------- 23/12 AM 12.2/12.7 1.7/ 2.2 1.3/ 1.8 3 None 23/12 PM 10.8/11.3 0.2/ 0.8 0.9/ 1.4 3 None 24/12 AM 11.4/11.9 0.9/ 1.4 0.7/ 1.1 2 None 24/01 PM 11.3/11.8 0.8/ 1.3 1.2/ 1.7 2-3 None 25/01 AM 11.8/12.3 1.3/ 1.8 1.2/ 1.7 2 None 25/01 PM 10.7/11.2 0.2/ 0.7 0.8/ 1.3 2 None Sandwich Harbor MLLW Categories - Minor 12.0 ft, Moderate 14.0 ft, Major 15.0 ft MHHW Categories - Minor 1.7 ft, Moderate 3.7 ft, Major 4.7 ft Total Total Departure Day/Time Tide Tide from Norm Waves Flood ft MLLW ft MHHW ft ft Impact -------- --------- --------- --------- ------- -------- 22/11 PM 10.6/11.1 0.2/ 0.8 1.4/ 1.9 2 None 23/12 PM 9.1/ 9.6 -1.3/-0.8 0.8/ 1.3 1-3 None 24/12 AM 9.7/10.2 -0.7/-0.2 0.6/ 1.1 2 None 24/01 PM 9.7/10.2 -0.7/-0.2 1.2/ 1.7 2-3 None 25/01 AM 10.2/10.7 -0.2/ 0.3 1.2/ 1.7 2 None 25/01 PM 9.2/ 9.7 -1.1/-0.7 0.8/ 1.3 2 None Wings Neck MLLW Categories - Minor 6.5 ft, Moderate 9.0 ft, Major 11.5 ft MHHW Categories - Minor 2.1 ft, Moderate 4.6 ft, Major 7.1 ft Total Total Departure Day/Time Tide Tide from Norm Waves Flood ft MLLW ft MHHW ft ft Impact -------- --------- --------- --------- ------- -------- 22/09 PM 6.0/ 6.5 1.6/ 2.0 1.6/ 2.0 1 Minor 23/09 AM 5.2/ 5.7 0.9/ 1.4 1.1/ 1.6 1-2 None 23/09 PM 5.1/ 5.6 0.7/ 1.1 0.7/ 1.1 2 None 24/10 AM 4.7/ 5.2 0.2/ 0.8 0.4/ 0.9 2-3 None 24/10 PM 4.7/ 5.2 0.2/ 0.8 0.4/ 0.9 2 None 25/10 AM 4.7/ 5.2 0.2/ 0.8 0.5/ 1.0 2 None &&
Small Craft Advisory
Issued: 6:03 PM Aug. 22, 2025 – National Weather Service
...SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM EDT SUNDAY... ...GALE WARNING IS CANCELLED... * WHAT...South winds 10 to 20 kt with gusts up to 30 kt and seas 8 to 13 feet. * WHERE...Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm and Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket. * WHEN...Until 8 PM EDT Sunday. * IMPACTS...Conditions will be hazardous to small craft. PRECAUTIONARY/PREPAREDNESS ACTIONS... Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions. &&
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