Current Snapshot

The Pacific Disaster Center’s (PDC Global) Friday, July 31, 2026, Tropical Cyclone Activity Report…for the Pacific Ocean, the Indian Ocean, and adjacent Seas

Current Tropical Cyclones:

Tropical cyclone 07E (Genevieve)…is located about 1195 miles west of the southern tip of Baja California

Tropical cyclone 12W (Dolphin)…is located approximately 368 NM west of Wake Island

Northeast Pacific:  

Tropical cyclone 07E (Genevieve) 

GENEVIEVE WEAKENING AS IT MOVES WEST-NORTHWESTWARD OVER THE OPEN PACIFIC

According to the NHC Advisory number 30

Genevieve is moving toward the west-northwest near 15 mph (24 km/h). This general motion is expected to continue during the next several days. Maximum sustained winds are now near 60 mph (95 km/h) with higher gusts. Gradual weakening is forecast during the next few days, and Genevieve is expected to become a remnant low late this weekend. Tropical-storm-force winds extend outward up to 115 miles (185 km) from the center. The estimated minimum central pressure is 996 mb (29.42 inches).

HAZARDS AFFECTING LAND 

SURF: Swells generated by Genevieve are affecting portions of the Baja California Peninsula and Southern California. These swells will persist for the next several days, and are causing life-threatening surf and rip current conditions.

Western Pacific, Indian Ocean, and adjacent Seas: 

Western Pacific

Tropical Cyclone 12W (Dolphin) 

According to the JTWC warning number 19  

Super typhoon (sty) 12W (Dolphin) continues to experience repeated eyewall replacement cycles (erc), and is currently in the midst of its third erc in as many days. There have been no recent high-resolution
microwave images to support a high-confidence assessment of the erc status, but a 311148z tms-06 184ghz microwave image depicted a significantly deteriorated inner eyewall, open in the southwestern
quadrant, with a much larger outer secondary eyewall. Animated enhanced infrared (eir) satellite imagery shows a slowly enlarging eye, now estimated to be 20 NM wide, which has remained cloud-free throughout the erc process. The associated central dense overcast (cdo) decreased in areal extent, warmed, and became increasingly ragged until the 1200z fix, where the trend reversed.

The late receipt of a 310735z sar pass revealed maximum winds of 130-135 knots at the beginning of the current erc, suggesting that weakening had already commenced.

The overall environment remains favorable, with low vws, warm ssts, moderate to high ohc, and moderate radial outflow aloft, enhanced by a weakening poleward outflow channel.

STY 12W will continue to track northwestward along the southwestern flank of an expansive str complex for the next 36-48 hours. A deep upper-level trough currently off the east coast of Honshu will continue to propagate eastward and reach its maximum equatorward extent within the next 12 to 24 hours. The associated jet max exiting the eastern flank of the trough will result in the trough weakening and receding poleward while building the str south of the
Aleutians.

At the same time, the expanding wind field associated with sty 12W will pull warm air poleward and build the western flank of the str to the north of sty 12W. As the deep trough recedes, it allows ridging to build in across the 35th parallel, ultimately establishing a ridge that will extend from the Korean Peninsula to south of the Aleutians. STY 12W will turn onto a westward track after 48 hours and
continue tracking west through the remainder of the forecast period.

Regarding intensity, the repeated eyewall replacement cycles show no sign of ceasing; while the current cycle will likely wrap up in the near-term, another will soon begin. Both the hafs-a and hwrf depict a steadily increasing eye diameter through 120 hours, with a concomitant increase in the overall wind field. While the forecast explicitly calls for a steady intensity, there will be short-term fluctuations in
intensity both above and below the forecast through the next 36 hours due to the anticipated ercs.

After 36 hours, the system is forecast to steadily weaken as it moves over marginally cooler ssts, decreased ohc, and into a region of moderate shear. However, the main driver in weakening the system will be the massive size of the inner core that is expected to develop after 72 hours.