540
FZPQ50 PGUM 170521
SRFGUM
SURF ZONE FORECAST FOR THE MARIANA ISLANDS
NATIONAL WEATHER SERVICE TIYAN GU
321 PM CHST SAT OCT 17 2026
DISCUSSION
THERE WILL BE A RAPID INCREASE IN THE RIP CURRENT RISK
THROUGH THIS AFTERNOON, WITH DANGEROUS RIP CURRENTS AND SURF LIKELY
THIS AFTERNOON OR EVENING THROUGH SUNDAY NIGHT. SURF HEIGHTS OF 20
TO 30 FEET ARE LIKELY ACROSS GUAM, WITH SURF HEIGHTS UP TO 35 FEET
NEAR THE EYE OF TY CHAMPI. SURF HEIGHTS WILL DECREASE NORTHWARD,
WITH 12 TO 18 FEET EXPECTED FOR TINIAN AND SAIPAN. THERE WILL ALSO
BE A HIGH RISK OF LIGHTNING TONIGHT THROUGH MONDAY. COASTAL FLOODING
IS EXPECTED ALONG EASTERN AND SOUTHERN REEFS, DEPENDING ON THE
ACTUAL TRACK OF CHAMPI.
GUZ001-MPZ001-172030-
GUAM-ROTA-
321 PM CHST SAT OCT 17 2026
THE ISLANDS OF GUAM AND ROTA ARE NOW UNDER A TROPICAL CYCLONE
WARNING. PLEASE REFER TO THE TROPICAL CYCLONE LOCAL STATEMENT WTPQ82
PGUM (HLSPQ2) FOR MORE UPDATED AND DETAILED SURF ZONE AND HAZARD
INFORMATION.
TIDE INFORMATION FOR THE NEXT 36 HOURS...
AT APRA HARBOR, GUAM...
LOW TIDE 1.6 FEET AT 6:48 PM SATURDAY
HIGH TIDE 1.8 FEET AT 10:21 PM SATURDAY
LOW TIDE 0.1 FEET AT 6:27 AM SUNDAY
HIGH TIDE 1.9 FEET AT 2:55 PM SUNDAY
LOW TIDE 1.6 FEET AT 8:19 PM SUNDAY
HIGH TIDE 1.7 FEET AT 11:25 PM SUNDAY
LOW TIDE 0.2 FEET AT 7:32 AM MONDAY
AT ROTA ISLAND...
LOW TIDE 1.5 FEET AT 6:42 PM SATURDAY
HIGH TIDE 1.7 FEET AT 10:18 PM SATURDAY
LOW TIDE 0.1 FEET AT 6:21 AM SUNDAY
HIGH TIDE 1.8 FEET AT 2:52 PM SUNDAY
LOW TIDE 1.5 FEET AT 8:13 PM SUNDAY
HIGH TIDE 1.6 FEET AT 11:22 PM SUNDAY
LOW TIDE 0.2 FEET AT 7:26 AM MONDAY
MPZ002-003-172030-
TINIAN-SAIPAN-
321 PM CHST SAT OCT 17 2026
THE ISLANDS OF GUAM AND ROTA ARE NOW UNDER A TROPICAL CYCLONE WATCH
AND WARNING. PLEASE REFER TO THE TROPICAL CYCLONE LOCAL STATEMENT
WTPQ82 PGUM (HLSPQ2) FOR MORE UPDATED AND DETAILED SURF ZONE AND
HAZARD INFORMATION.
TIDE INFORMATION FOR THE NEXT 36 HOURS...
AT TINIAN ISLAND...
LOW TIDE 0.5 FEET AT 6:25 PM SATURDAY
HIGH TIDE 1.3 FEET AT 10:19 PM SATURDAY
LOW TIDE 0.0 FEET AT 6:04 AM SUNDAY
HIGH TIDE 1.4 FEET AT 2:53 PM SUNDAY
LOW TIDE 0.5 FEET AT 7:56 PM SUNDAY
HIGH TIDE 1.2 FEET AT 11:23 PM SUNDAY
LOW TIDE 0.1 FEET AT 7:09 AM MONDAY
AT TANAPAG HARBOR, SAIPAN...
LOW TIDE 1.7 FEET AT 7:08 PM SATURDAY
HIGH TIDE 1.7 FEET AT 9:38 PM SATURDAY
LOW TIDE 0.2 FEET AT 6:42 AM SUNDAY
HIGH TIDE 1.9 FEET AT 3:13 PM SUNDAY
LOW TIDE 0.3 FEET AT 7:44 AM MONDAY
HIGH TIDE 1.9 FEET AT 4:08 PM MONDAY
LOW TIDE 1.5 FEET AT 9:56 PM MONDAY
* 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.
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