WPAC: INVEST 91W

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91W INVEST 250725 1800 27.8N 132.6E WPAC 15 1000

[Hayabusa]

Now low

ABPW10 PGTW 260600
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/SIGNIFICANT TROPICAL WEATHER ADVISORY FOR THE WESTERN AND SOUTH
PACIFIC OCEANS REISSUED/260600Z-270600ZJUL2025//
REF/A/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/260152ZJUL2025//
REF/B/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/260151ZJUL2025//
REF/C/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/251351ZJUL2025//
NARR/REFS A AND B ARE TROPICAL CYCLONE WARNINGS. REF C IS A TROPICAL
CYCLONE FINAL WARNING.//
RMKS/
1. WESTERN NORTH PACIFIC AREA (180 TO MALAY PENINSULA):
A. TROPICAL CYCLONE SUMMARY:
(1) AT 26JUL25 0000Z, TROPICAL STORM 12W (KROSA) WAS LOCATED
NEAR 17.8N 143.7E, APPROXIMATELY 121 NM WEST OF ALAMAGAN, AND HAD
TRACKED EAST-NORTHEASTWARD AT 03 KNOTS OVER THE PAST SIX HOURS.
MAXIMUM SUSTAINED SURFACE WINDS WERE ESTIMATED AT 50 KNOTS GUSTING TO
65 KNOTS. SEE REF A (WTPN31 PGTW 260300) FOR FURTHER DETAILS.
(2) AT 26JUL25 0000Z, TROPICAL DEPRESSION 11W (CO-MAY) WAS
LOCATED NEAR 25.3N 125.7E, APPROXIMATELY 134 NM WEST-SOUTHWEST OF
KADENA AB, AND HAD TRACKED NORTH- NORTHEASTWARD AT 18 KNOTS OVER THE
PAST SIX HOURS. MAXIMUM SUSTAINED SURFACE WINDS WERE ESTIMATED AT 25
KNOTS GUSTING TO 35 KNOTS. SEE REF B (WTPN33 PGTW 260300) FOR FURTHER
DETAILS.
(3) AT 25JUL25 1200Z, TROPICAL DEPRESSION 10W (FRANCISCO) WAS
LOCATED NEAR 26.2N 121.7E, APPROXIMATELY 67 NM NORTH OF TAIPEI,
TAIWAN, AND HAD TRACKED WEST- SOUTHWESTWARD AT 09 KNOTS OVER THE PAST
SIX HOURS. MAXIMUM SUSTAINED SURFACE WINDS WERE ESTIMATED AT 25 KNOTS
GUSTING TO 35 KNOTS. SEE REF C (WTPN32 PGTW 251500) FOR THE FINAL
WARNING ON THIS SYSTEM.
(4) NO OTHER TROPICAL CYCLONES.
B. TROPICAL DISTURBANCE SUMMARY:
(1) AN AREA OF CONVECTION (INVEST 91W) HAS PERSISTED NEAR 28.4N
133.2E, APPROXIMATELY 152 NM EAST OF AMAMI OSHIMA. ANIMATED
MULTISPECTRAL SATELLITE IMAGERY (MSI) DEPICTS A DISORGANIZED AREA OF
FLARING CONVECTION AND LOW-LEVEL CONVERGENCE WITH SLIGHT CURVATURE ON
THE SOUTH-SOUTHEAST PERIPHERY OF INVEST 91W. A 260146Z ASCAT-B PASS
REVEALS A BROAD AND ASYMMETRIC WIND FIELD. ENVIRONMENTAL ANALYSIS
INDICATES MARGINAL TO FAVORABLE CONDITIONS FOR DEVELOPMENT WITH
MODERATE VWS (VERTICAL WIND SHEAR), GOOD EQUATORWARD OUTFLOW ALOFT,
AND WARM (30-31C) SEA SURFACE TEMPERATURE. GLOBAL MODELS ARE IN
AGREEMENT WITH INVEST 91W SLOWLY DEVELOPING OVER THE NEXT 48 HOURS.
MAXIMUM SUSTAINED SURFACE WINDS ARE ESTIMATED AT 13 TO 18 KNOTS.
MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO BE NEAR 1000 MB. THE
POTENTIAL FOR THE DEVELOPMENT OF A SIGNIFICANT TROPICAL CYCLONE
WITHIN THE NEXT 24 HOURS IS UPGRADED TO LOW.
(2) NO OTHER SUSPECT AREAS.
C. SUBTROPICAL SYSTEM SUMMARY: NONE.
2. SOUTH PACIFIC AREA (WEST COAST OF SOUTH AMERICA TO 135 EAST):
A. TROPICAL CYCLONE SUMMARY: NONE.
B. TROPICAL DISTURBANCE SUMMARY: NONE.
C. SUBTROPICAL SYSTEM SUMMARY: NONE.//
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[Hayabusa]

91W INVEST 250726 1200 28.1N 132.9E WPAC 30 998