Arecibo
NDBC buoy 41121
Observed , 48 minutes ago
Hazardous
Today
Rough seas at 5 ft with 11 second dominant period from the NNE. Water 86°F, air 85°F. Today: West winds around 5 knots.
It tells you it is rough now. The app tells you before it gets rough, with alerts at the wind and wave limits you set.
Get Buoycast for iPhoneWaves
4.6ft
Period
11 s
Direction
24° NNE
Last 11 hours3.9 to 4.9 ft
Air temp
85°F
77 to 86°F today
Water temp
86°F
85 to 86°F today
Zone forecast
Today
West winds around 5 knots. Seas 5 to 6 feet, occasionally to 8 feet. Wave detail: north 5 feet at 11 seconds. Isolated showers late this morning. Scattered showers with isolated thunderstorms early this afternoon, then isolated showers late.
Tonight
Southeast winds around 5 knots. Seas 5 to 6 feet, occasionally to 8 feet. Wave detail: north 5 feet at 11 seconds. Scattered showers in the evening.
Monday
Southeast winds around 5 knots, becoming east in the afternoon. Seas 4 to 5 feet, occasionally to 6 feet. Wave detail: northeast 5 feet at 10 seconds. Scattered showers in the afternoon.
Synopsis
A low-pressure northeast of the region will continue moving eastward over the next few days, while high pressure builds across the western Atlantic. Light to moderate westerly to southwesterly winds today will become variable tonight, then gradually shift to a more easterly direction early this week. A northerly to northeasterly swell will peak today through tonight, maintaining hazardous conditions near exposed Atlantic coastal waters. Although seas will remain below Small Craft Advisory criteria, the longer-period swell will produce locally rough conditions, particularly across the offshore Atlantic waters. The northeasterly swell will gradually subside on Monday, with improving marine conditions expected thereafter. Showers and isolated thunderstorms will remain possible across the regional waters through midweek.
NWS zone Coastal Waters of Northern Puerto Rico out 10 NM
Last 24 hours
Every 3 hours, over the last 12 hours. Air 77 to 86°F over the same window.
Common questions
How often does buoy 41121 report?
temperature update about every 10 minutes. Wave height and period update about every 30 minutes.
Can I be notified when conditions change at buoy 41121?
Buoycast Pro lets you set your own limits on wind, waves or pressure and sends a threshold notification when this buoy crosses them.
Does this page show NOAA warnings for this area?
Watches, warnings, and advisories for Coastal Waters of Northern Puerto Rico out 10 NM appear alongside the conditions, here and in the app. Pro also pushes NOAA watches, warnings, and advisories when they are issued.
Can I see the forecast against what buoy 41121 measured?
This page shows measurements only. Buoycast Pro charts the NOAA forecast against them so you can see where the two diverge.
Can I keep buoy 41121 for next time?
Save it as a favorite and Buoycast opens on the buoys you run.
What this buoy measures
This buoy is not reporting wind or barometric pressure. Conditions above come from the sensors it does carry, and the forecast, tides and sun times on this page are regional rather than measured at the buoy.
Station 41121
18°29'24" N 66°42'04" W · owned and maintained by Caribbean Integrated Coastal Ocean Observing System (CarICoos)
Measured on the water by 1,000+ NOAA buoys. Observations from the National Data Buoy Center, forecasts and advisories from the National Weather Service. Not for navigation.