Weather HQ at Jeff's Pirates Cove, Ipan, Guam

Gentle to moderate northeast to east winds will prevail across Guam and Rota waters though at least Friday night, and start to diminish Saturday as wind direction briefly shifts southeast. For Saipan and Tinian, winds will be moderate to fresh out of the east over the next few days with occasional strong gusts Friday as trade winds briefly surge across the far northern CNMI. Combined seas of 6 to 8 feet could briefly increase a foot tonight as the highest pulse of the northeasterly swell arrives then, for Tinian and Saipan waters. Seas look to diminish thereafter as this swell begins to weaken. Scattered showers and isolated thunderstorms are expected for tonight as a trough pushes west into the area, along the northern periphery of Invest 98W. 98W will maintain unsettled weather and thunderstorm chances for the next few days as it shifts westward, mainly for Tinian and Saipan waters where convergence will be strongest.

Friday Night

East wind 5 to 15 kt. Seas 5 to 7 ft. Wave Detail: Northeast 5 ft at 9 seconds, west 4 ft at 13 seconds and east 3 ft at 4 seconds.

Saturday

Southeast wind 5 to 10 kt. Seas 5 to 7 ft. Wave Detail: Northeast 6 ft at 9 seconds, west 3 ft at 14 seconds and southeast 2 ft at 4 seconds.

Saturday Night

East wind 5 to 10 kt. Seas 5 to 7 ft. Wave Detail: North 6 ft at 10 seconds and northwest 3 ft at 14 seconds.

Sunday

East wind 5 to 10 kt. Seas 5 to 7 ft. Wave Detail: North 5 ft at 10 seconds, northwest 3 ft at 15 seconds and northeast 2 ft at 4 seconds. Isolated thunderstorms.

Monday and Tuesday

Northeast wind 10 kt. Seas 4 to 6 ft. Wave Detail: Northeast 5 ft at 9 seconds, east 2 ft at 4 seconds and northwest 2 ft at 14 seconds.

5. Magnitude 4.4Volcano Islands, Japan region (opens in a new tab)Oct 12, 3:05am. 599 miles north of Guam, 10 km deep.
6. Magnitude 4.2Mariana Islands region (opens in a new tab)Oct 11, 3:13pm. 579 miles north-northwest of Guam, 305 km deep.
7. Magnitude 5.341 km NNE of Yigo Village, Guam (opens in a new tab)Oct 10, 1:58pm. 35 miles northeast of Guam, 112 km deep. Felt by 40 people.
8. Magnitude 4.9State of Yap, Federated States of Micronesia (opens in a new tab)Oct 6, 2:40pm. 461 miles south of Guam, 10 km deep.
9. Magnitude 5.0187 km ENE of Saipan, Northern Mariana Islands (opens in a new tab)Oct 5, 8:52pm. 238 miles northeast of Guam, 10 km deep.
10. Magnitude 4.075 km NNE of Saipan, Northern Mariana Islands (opens in a new tab)Oct 5, 4:26am. 185 miles north-northeast of Guam, 126 km deep.
11. Magnitude 4.7221 km NNE of Colonia, Micronesia (opens in a new tab)Oct 4, 3:57pm. 414 miles west-southwest of Guam, 10 km deep.
12. Magnitude 4.1Mariana Islands region (opens in a new tab)Oct 1, 1:46pm. 574 miles north of Guam, 181 km deep.
13. Magnitude 4.427 km ESE of San Jose Village, Northern Mariana Islands (opens in a new tab)Sep 30, 9:46am. 123 miles northeast of Guam, 109 km deep.
14. Magnitude 4.0Pagan region, Northern Mariana Islands (opens in a new tab)Sep 28, 4:54am. 352 miles north of Guam, 178 km deep.
15. Magnitude 4.3Volcano Islands, Japan region (opens in a new tab)Sep 27, 7:16am. 620 miles north of Guam, 144 km deep.
16. Magnitude 4.4Pagan region, Northern Mariana Islands (opens in a new tab)Sep 26, 1:09am. 343 miles north-northeast of Guam, 109 km deep.
17. Magnitude 4.2130 km WSW of Merizo Village, Guam (opens in a new tab)Sep 25, 8:39am. 94 miles west-southwest of Guam, 130 km deep.
18. Magnitude 4.2Pagan region, Northern Mariana Islands (opens in a new tab)Sep 24, 10:43pm. 368 miles north of Guam, 217 km deep.
19. Magnitude 4.4197 km N of Fais, Micronesia (opens in a new tab)Sep 24, 2:36am. 309 miles west-southwest of Guam, 54 km deep.
20. Magnitude 4.4132 km SSW of Merizo Village, Guam (opens in a new tab)Sep 24, 1:58am. 97 miles south-southwest of Guam, 10 km deep.
21. Magnitude 5.0Mariana Islands region (opens in a new tab)Sep 23, 11:01pm. 579 miles north-northwest of Guam, 307 km deep.

Area Forecast Discussion National Weather Service Tiyan GU 551 AM ChST Thu Oct 22 2026 .Marianas Update... Combined seas of 6 to 9 feet will diminish back to between 5 and 8 feet by Saturday, if not Friday. An approaching trough is bringing scattered showers and isolated thunderstorms, nothing more substantial than that at this time. This was all covered in the inherited forecast, with the exception that I had to start the active weather today instead of tonight, so I made that tweak. && .Eastern Micronesia Update... Based on satellite trends, changed scattered showers to isolated at Pohnpei. Kosrae and Majuro were in fine shape and did not need any changes. Swells are at or below 5 feet and winds are at or below 15 knots, so marine conditions are pretty benign. && .Western Micronesia Update... No changes were needed at Palau or Yap, where the partly cloudy skies and isolated shower forecast is threatened only by the amount of cirrus passing overhead. At Chuuk, the clouds nearby have a bubbly appearance on satellite, so while the coverage doesn't look numerous, I also wasn't going to cut it below scattered. So, just made them scattered at 40 percent instead of numerous at 70 percent. && .Prev discussion... /issued 441 PM ChST Wed Oct 21 2026/ Marianas Synopsis... Gentle to moderate northeasterlies prevail across the Marianas. Satellite imagery and Doppler radar indicate a few showers making their way across the coastal waters from the northeast. Most recent altimetry passes indicate 6 to 8 foot seas to the east of the region. Discussion... A mostly dry trade-wind pattern is expected through Thursday, as the ridge from previous days begins to exit to the west following distant STY Champi. After, a trade-wind trough coming in from the east- northeast is expected to move in, bringing low-end patchy showers and some thunderstorms enhanced by the pinching between the subtropical ridge to the north, and building tropical disturbances to the southeast. A return of another tropical ridge spanning from Palau is likely during the weekend, bringing another period of drier conditions beginning Sunday. Marine... Combined seas of 6 to 8 feet are expected through at least Thursday, to then briefly increase a foot Thursday night as the highest pulse of the northeasterly swell arrives then. Seas look to diminish thereafter as this swell begins to weaken. A moderate risk of rip currents is expected along north, east, and west facing reefs of the Marianas for much of this week due to a strengthening northeasterly swell, and a secondary westerly swell produced by distant STY Champi. Tropical Systems... At 100 PM ChST, the center of Super Typhoon Champi was located near 18N130E along the northwesternmost edge of the region. Champi is moving west-northwest at 17 mph, and then expected to make a slight turn toward the northwest with a decrease in forward speed through Thursday. Maximum sustained winds have decreased to 180 mph. Champi is forecast to weaken through tonight, but will remain a major typhoon as it continues heading toward Taiwan, before recurving toward the Ryukyu Islands. This means that the system has left NWS Guam's Area of Responsibility (AOR). For more information, see bulletins issued by the Joint Typhoon Warning Center under WMO header WTPN32 PGTW and by the National Weather Service under WMO header WTPQ32 PGUM. Eastern Micronesia... The monsoon trough fragment remains active over eastern Micronesia, primarily south of the main forecast points. It is expected to produce scattered showers and possibly isolated thunderstorms at all three locations tonight. Convection looks to linger over Majuro through Thursday and at Pohnpei through Thursday night, with Kosrae seeing drier conditions by Thursday morning. After these showers move out, expect a dry pattern for all three forecast points that will likely continue through the beginning of next week. During the time, the monsoon trough looks to reorganize and link up with a developing monsoon trough over western Micronesia. For the marine forecast, fairly benign conditions will continue for the next several days, with mostly light to gentle winds and seas between 3 and 5 feet. Pohnpei and Majuro will see occasional moderate winds the next day or two. Western Micronesia... As Champi continues to move off to the west-northwest, winds and seas continue to slowly subside at Palau and Yap. Unfortunately, as a ridge of high pressure moves slowly west, isolated showers are the most that we can hope for rainfall wise. Light to gentle winds will prevail through the forecast period. Further east at Chuuk, a weak disturbance located just to your south has plenty of convection associated with it, mainly across the southeastern semicircle (the northeast through southeast through southwest regions). Some of this convection features heavy rainfall, as evident by cloud top temperatures surpassing -80 C. The circulation is not forecast to develop into a tropical cyclone, but it will drift north-northwest the next 60 hours or so. This will bring mainly scattered showers to Chuuk, but a period of locally heavy rainfall associated with numerous showers is already in the forecast for Thursday, and this may need to be extended as the disturbance takes it's time crossing the area. Moderate to gentle winds and a brief increase in wave height will occur as it moves through the area. After that, winds and waves will diminish. However, a strengthening southwest monsoon flow will keep scattered showers going into early next week. && .GUM WATCHES/WARNINGS/ADVISORIES... GU...None. MP...None. Marianas Waters...None. && $$ Marianas/East and West Micronesia/Tropical Update: Stanko Marianas/Tropical: Montvila East Micronesia: Kleeschulte West Micronesia: Doll

Surf Zone Forecast for the Mariana Islands National Weather Service Tiyan GU 400 PM ChST Thu Oct 22 2026 .DISCUSSION...There will be a moderate risk of rip currents through the weekend, mainly along north and east facing reefs. There will also be moderate risk of lightning through at least Friday night, mainly for Tinian and Saipan. $$ GUZ001-MPZ001>003-222045- Guam-Rota-Tinian-Saipan- 400 PM ChST Thu Oct 22 2026 36 hour Surf Zone Forecast for the Marianas from 600 PM Thursday through 600 AM Saturday .TONIGHT... Rip Current Risk.....Moderate *. Surf Height North facing reefs............6 to 8 feet. East facing reefs............6 to 8 feet. South facing reefs............3 to 5 feet. West facing reefs............3 to 5 feet. Swell/Period Primary swell................Northeast at 5 to 7 feet. Primary period...............8 seconds. Secondary swell..............West at around 3 feet. Secondary period.............12 seconds. Water Temperature Pago buoy.......... 86 Degrees. Winds...............Northeast at 10 to 20 mph. .FRIDAY... Rip Current Risk.....Moderate *. Surf Height North facing reefs............6 to 8 feet. East facing reefs............6 to 8 feet. South facing reefs............3 to 5 feet. West facing reefs............3 to 5 feet. Swell/Period Primary swell................Northeast at 4 to 7 feet. Primary period...............8 seconds. Secondary swell..............West at around 3 feet. Secondary period.............12 seconds. Max Heat Index.........Around 99. Winds...............Northeast at 10 to 15 mph. .FRIDAY NIGHT... Rip Current Risk.....Moderate *. Surf Height North facing reefs............6 to 8 feet. East facing reefs............5 to 7 feet. South facing reefs............3 to 5 feet. West facing reefs............4 to 6 feet. Swell/Period Primary swell................Northeast at 4 to 6 feet. Primary period...............8 seconds. Secondary swell..............West at around 4 feet. Secondary period.............13 seconds. Winds...............East at 10 to 15 mph. Tide information for the next 36 hours... At Apra Harbor, Guam... High tide 2.2 feet at 5:19 PM Thursday Low tide 0.8 feet at 11:31 PM Thursday High tide 1.9 feet at 5:08 AM Friday Low tide 0.5 feet at 11:12 AM Friday High tide 2.3 feet at 5:41 PM Friday Low tide 0.5 feet at 12:03 AM Saturday High tide 2.1 feet at 6:05 AM Saturday At Rota Island... High tide 2.1 feet at 5:16 PM Thursday Low tide 0.8 feet at 11:25 PM Thursday High tide 1.8 feet at 5:05 AM Friday Low tide 0.5 feet at 11:06 AM Friday High tide 2.1 feet at 5:38 PM Friday Low tide 0.5 feet at 11:57 PM Friday High tide 1.9 feet at 6:02 AM Saturday At Tinian Island... High tide 1.6 feet at 5:17 PM Thursday Low tide 0.3 feet at 11:08 PM Thursday High tide 1.4 feet at 5:06 AM Friday Low tide 0.2 feet at 10:49 AM Friday High tide 1.7 feet at 5:39 PM Friday Low tide 0.2 feet at 11:40 PM Friday High tide 1.5 feet at 6:03 AM Saturday At Tanapag Harbor, Saipan... High tide 2.1 feet at 5:28 PM Thursday Low tide 0.9 feet at 11:26 PM Thursday High tide 1.7 feet at 5:16 AM Friday Low tide 0.5 feet at 11:11 AM Friday High tide 2.1 feet at 5:49 PM Friday Low tide 0.6 feet at 11:59 PM Friday High tide 1.9 feet at 6:14 AM Saturday * Low Risk of rip currents - Strong currents can still occur near jetties and reef channels. Always have a flotation device with you in the water. Moderate Risk of rip currents - Wave conditions support stronger or more frequent rip currents. Always have a flotation device with you in the water. High Risk of rip currents - Large waves will produce strong rip currents, especially along narrow reefs and beaches. Rip currents will be life threatening. If caught in a rip current, swim parallel to the beach rather than against the current. $$

BULLETIN Super Typhoon Champi (29W) Advisory Number 28 National Weather Service Tiyan GU WP292026 811 PM ChST Wed Oct 21 2026 ...SUPER TYPHOON CHAMPI MOVING WEST-NORTHWEST ACROSS THE PHILIPPINE SEA... CHANGES WITH THIS ADVISORY -------------------------- None. WATCHES AND WARNINGS -------------------- None. SUMMARY OF 700 PM CHST...0900 UTC...INFORMATION ----------------------------------------------- Location...19.0N 128.4E About 900 miles north-northwest of Koror About 920 miles northwest of Yap About 1150 miles west-northwest of Guam About 1160 miles west-northwest of Rota About 1170 miles west-northwest of Tinian About 1175 miles west-northwest of Saipan Maximum sustained winds...175 mph Present movement...west-northwest...300 degrees at 15 mph DISCUSSION AND OUTLOOK ---------------------- At 700 PM CHST...0900 UTC...the center of Super Typhoon Champi was located near Latitude 19.0 degrees North and Longitude 128.4 degrees East. Champi is moving west-northwest at 15 mph. It is expected to make a slight turn toward the northwest with a decrease in forward speed through Thursday, as it continues to traverse open waters. Maximum sustained winds have decreased to 175 mph. Champi is forecast to weaken through Thursday. Typhoon force winds extend outward from the center up to 100 miles. Tropical storm force winds extend outward from the center up to 310 miles. NEXT ADVISORY ------------- This will be the last advisory issued by the National Weather Service on Champi. $$ Doll