349
FGMY70 PGUM 220807
ESFGUM
GUC010-MPC100-110-120-230800-
HYDROLOGIC OUTLOOK
NATIONAL WEATHER SERVICE TIYAN GU
607 PM CHST TUE JUL 22 2025
..HEAVY RAINFALL EXPECTED LATE IN THE WEEK THROUGH THE WEEKEND
THIS HYDROLOGIC OUTLOOK IS FOR THE GUAM, ROTA, TINIAN AND SAIPAN.
A TROPICAL DISTURBANCE, JOINT TYPHOON WARNING CENTER'S INVEST 98W,
IS CENTERED SOUTHEAST OF GUAM NEAR 10.7N 151.1E. THIS SYSTEM REMAINS
HIGHLY DISORGANIZED, BUT IS EXPECTED TO MOVE TOWARD THE MARIANAS
OVER THE NEXT DAY OR TWO AS IT CONSOLIDATES. 98W IS EXPECTED TO
BRING HEAVY RAINFALL TO THE MARIANAS THURSDAY EVENING THROUGH SUNDAY
WITH AN EXPECTED PEAK ON FRIDAY THROUGH SATURDAY. MODELS DIFFER ON
LOCATION AND STRENGTH OF 98W AS IT MOVES NEAR THE MARIANAS, HOWEVER,
THERE IS STRONG AGREEMENT THAT HEAVY RAINFALL IS LIKELY AS EARLY AS
THURSDAY, CONTINUING THROUGH THE WEEKEND.
THERE IS A POTENTIAL FOR GUAM AND THE CNMI TO SEE RAINFALL AMOUNTS
OF 5 TO 10 INCHES BY SUNDAY, THOUGH LOCALLY HEAVIER AMOUNTS ARE
POSSIBLE. THIS RAINFALL IS EXPECTED TO PRODUCE MINOR FLOODING ACROSS
THE ISLANDS, WITH FLASH FLOODING POSSIBLE IN AREAS OF HEAVIER
RAINFALL, ESPECIALLY OVER SOUTHERN GUAM.
RESIDENTS ON THE MARIANAS NEED TO CLOSELY MONITOR THIS DEVELOPING
SITUATION AS WATCHES, ADVISORIES AND WARNINGS COULD BE ISSUED LATER.
IF LIVING NEAR STREAMS AND RIVERS, PREPARE TO MOVE ITEMS AWAY FROM
STREAM AND RIVER BANKS. MAKE SURE STORM DRAINS NEARBY ARE NOT
CLOGGED, ESPECIALLY IF LIVING IN LOW-LYING AREAS.
DD
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