683
FXPQ50 PGUM 032037
AFDGUM
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TIYAN GU
637 AM CHST THU SEP 4 2025
MARIANAS UPDATE
MARIANAS GRIDS LOOKED GOOD AS THEY WERE. A SERIES OF TROUGHS
STRETCHES TO THE EAST, SO FOR AT LEAST THE NEXT FEW DAYS SCATTERED
SHOWERS WILL CONTINUE. WINDS AND SEAS ARE BENIGN, AND EXPECTED TO
REMAIN THAT WAY FOR THE FORESEEABLE FUTURE.
EASTERN MICRONESIA UPDATE
THE EASTERN MICRONESIA GRIDS ALSO LOOKED GOOD. MAJURO AND KOSRAE WERE
SCATTERED, AND POHNPEI WAS ISOLATED, AND ALL WERE PARTLY SUNNY. THE
SHOWERS WILL BE MOVING INTO POHNPEI TONIGHT MOST LIKELY.
WESTERN MICRONESIA UPDATE
WESTERN MICRONESIA GRIDS ALSO LOOKED FINE. CHUUK IS HIGH AND DRY, AND
THE MONSOON SHOWERS SOUTH OF THE NEWLY MINTED TROPICAL DEPRESSION 21W
(WHICH IS NORTH OF MICRONESIA, AND THEREFORE WILL NOT BE MENTIONED
FURTHER) HAVE LIFTED NORTH OF KOROR AND YAP.
PREV DISCUSSION
/ISSUED 601 PM CHST WED SEP 3 2025/
MARIANAS SYNOPSIS...
SATELLITE IMAGERY SHOWS MOSTLY CLOUDY SKIES, WHILE RADAR SHOWS
STRATIFIED SHOWERS OVER THE MARIANAS. BUOYS INDICATE SEAS ARE 2 TO 3
FEET.
DISCUSSION...
A TROUGH IS SLOWLY MOVING TOWARDS THE MARIANAS. THIS WILL BRING
SCATTERED SHOWERS TO THE REGION THROUGH THE END OF THE WEEK. RADAR
SHOWS SHOWERS DIMINISHING OVER THE ISLANDS, HOWEVER, THIS WON'T
LAST. THE WINDS ARE EXPECTED TO CONVERGE, SPARKING MORE SHOWERS
TONIGHT. THIS CONVERGENCE IS ANTICIPATED TO LAST THROUGH THE REST OF
THE WEEK. ONCE THIS TROUGH AND CONVERGENCES PASSES, A RIDGE IS
ANTICIPATED TO BUILD IN, BRINGING IN SOME DRIER MORE PLEASANT
WEATHER.
MARINE...
LIGHT TO MODERATE WINDS WILL PERSIST THROUGH THURSDAY NIGHT, THEN
BECOMING LIGHT TO GENTLE. SEAS OF 3 TO 4 FEET COULD DIMINISH SLIGHTLY
TO BETWEEN 2 AND 3 FEET ON FRIDAY. THERE IS A LOW RISK OF RIP
CURRENTS ALONG ALL REEFS. SURF AND SWELL ARE EXPECTED TO REMAIN LOW
THROUGH THE END OF THE WEEK. THE LIGHTNING RISK FOR GUAM AND ROTA HAS
DIMINISHED AND IS NOT ANTICIPATED TO RETURN UNTIL THE WEEKEND. THE
LIGHTNING RISK FOR TINIAN AND SAIPAN IS EXPECTED TO RETURN THURSDAY
AS MODERATE AND REMAIN THROUGH THE WEEKEND.
EASTERN MICRONESIA...
A SERIES OF TROUGHS WILL CONTINUE TO MOVE ACROSS THE REGION THROUGH
EARLY NEXT WEEK. DUE TO THE LACK OF A COHERENT ITCZ, THESE TROUGHS
WILL BE THE MAIN DRIVER FOR INCREASING RAINFALL POTENTIAL, WITH WINDS
OVER THE WATERS ALSO IN THE GENTLE TO MODERATE RANGE AS THESE
FEATURES CROSS THE AREA. OTHERWISE, LOOK FOR ISOLATED SHOWERS TO BE
THE MOST WE CAN HOPE FOR. WINDS WILL BE IN THE LIGHT TO GENTLE RANGE
OUTSIDE OF TROUGH PASSAGE, WITH SEAS OF 3 TO 5 FEET EXPECTED.
WESTERN MICRONESIA...
AFTER TONIGHT'S PATCHY SHOWERS AND SOME THUNDERSTORMS AT PALAU AND
YAP, A MOSTLY DRY WEATHER REGIME IS EXPECTED TO ENSUE AT ALL THREE
LOCATIONS, AS TRADES RETURN AND MOST OF THE CONVECTION REMAINS
UPSTREAM AND NORTHWEST OF THE REGION. GENTLE TO MODERATE TRADE WINDS
ARE EXPECTED FOR MUCH OF THE FORECAST PERIOD, WHICH WILL CONTINUE TO
KEEP THE EASTERLY SWELL FAIRLY WEAK, PRODUCING ONLY 3 TO 4 FOOT SEAS
ACROSS MUCH OF THE REGION.
GUM WATCHES/WARNINGS/ADVISORIES
GU...NONE.
MP...NONE.
MARIANAS WATERS...NONE.
MARIANAS/EAST AND WEST MICRONESIA UPDATE: STANKO
MARIANAS: BOWSHER
EAST MICRONESIA: DOLL
WEST MICRONESIA: MONTVILA
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page