FSM - Emergency Management Division

Tropical Disturbance, Invest 99W near Yap, becomes Tropical Depression Jangmi (06W)

7:00 pm ChST - 27 May 2026

The JTWC upgraded 99W to TD Jangmi, centered 60 miles WNW of Yap near 9.9N 137.3E. It was moving NNW at 5 mph with maximum sustained winds of 30 mph.

TD Jangmi is expected to strengthen, likely becoming a tropical storm on Thursday. The fact that it has a name indicates that the JMA/Tokyo Typhoon Center already analyzes this depression as a tropical storm.

Based on JTWC, tropical storm force winds are not expected across Yap State as Jangmi begins to pull away. However - the monsoon will surge across the region, including Palau and across western Yap State - primarily islands and atolls near and west of Woleai.

Surging showers, locally heavy rainfall and wind gusts up to 40 knots over the waters and along windward coastal areas of Yap, and up to 30 knots across Palau will, at times, feel like tropical storm force conditions.

Strong winds have not yet set in over Yap Proper, but they’re coming, as the monsoon shifts north.

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>Tropical Storm Watches/Warnings are not in effect nor anticipated
>TD Jangmi poses no threat to Guam/CNMI
>TD Jangmi to generate a monsoon surge across Palau and western Yap thru end of this week
>Jangmi likely to intensify, becoming a typhoon in the coming days
>Jangmi could threaten islands of southwestern Japan, including Okinawa as it recurves toward mainland Japan
>Small Craft and High Surf Advisories in effect for Palau and Yap

# # #

Jangmi is now the 6th tropical cyclone in the western North Pacific in 2026. The name “Jangmi” originates from the Republic of Korea (South Korea) and translates to “rose”

For all the latest on TD Jangmi, visit NWS Guam on the web at weather.gov/gum

Weekly Regional Weather Outlook
Tuesday, May 26, 2026
Valid at 10:45 AM ChST

REGIONAL OVERVIEW:

Moderate to fresh trades prevail across the Marianas with a mix of sun and spotty showers. A developing disturbance near Yap, Invest 99W, will keep well southwest and west of the Marianas. However, steady trades converging into the eastern periphery of the broader wind field around 99W will keep a showery pattern in place across the Marianas this week. Combined seas of 3 to 5 feet will build to around 6 to 8 feet by the end of the week as a long-period north swell, and southwest swell reach the Marianas.

A wet pattern will prevail this week across Yap and Palau as Invest 99W takes shape nearby. 99W will lift north-northwest over Yap into the Philippine Sea by Wednesday. As it does, it’ll pull the showery monsoon over both locations, keeping strong, gusty southwest to west winds, showers, thunderstorms and choppy seas in place through the week. A Special Weather Statement has been issued for western Micronesia to provide more details.

Farther east, variable winds and a few showers are found near Chuuk, while the ITCZ is generating showers and thunderstorms near Pohnpei and Kosrae. Drier weather prevails near and north of Majuro. Significant weather is not expected across the eastern region through the weekend, but passing surface troughs will bring periods of scattered showers. Otherwise, expect light to moderate winds and combined seas of 4 to 6 feet across Chuuk, Pohnpei and Kosrae, and moderate trades with seas up to 7 feet across Majuro.

TC POTENTIAL/HAZARDS:

A tropical disturbance, Invest 99W, tracked slowly westward across Yap State the last several days. Now located near 8.4N 138.8E, it has been upgraded to medium for development by the Joint Typhoon Warning Center. This means that tropical cyclone (TC) development is likely, but beyond 24 hours. In other words, 99W is likely to be upgraded to a tropical depression on Wednesday.

99W will move toward the NNW into the Philippine Sea as it continues to develop. Showers, thunderstorms, locally heavy rainfall and gusty west to southwest winds will encompass much of the region the next few days south of 99W, the associated trough and a second circulation to the west. This will include Palau and Yap State. 99W does not pose a threat to Guam or the CNMI, and will keep well to the west.

Elsewhere across the NWS Guam AOR, there are no suspect areas for TC development through the weekend.

DROUGHT OUTLOOK:

No drought concerns at this time. Regional rainfall patterns remain sufficient to meet needs. However, a drier trend will take shape across western Micronesia the next few weeks into at least mid-June, with below-normal rainfall anticipated for islands across Palau and Yap State. Expect near-normal rainfall elsewhere.

TROPICAL DISTURBANCE VS TROPICAL CYCLONE:

A tropical disturbance is an area of disturbed weather, such as a broad area of showers, thunderstorms, and gusty winds with some degree of organization. It may or may not have a closed circulation and it may or may not develop. On a weather map, it is labeled with a number between 90 and 99, and followed by "W", denoted the western North Pacific basin.

A tropical cyclone is a term that includes tropical depressions, tropical storms, typhoons (or hurricanes/cyclones, depending on the ocean basin) and super typhoons. All tropical cyclones begin as a disturbance, but not all disturbances become tropical cyclones. Once upgraded from a tropical disturbance, tropical cyclones receive a new number. In our present case, if Invest 99W becomes a tropical depression, it'll be assigned the number "06W", indicating it is the 6th tropical cyclone in 2026. The "W" denotes the western North Pacific basin.

FOR MORE INFORMATION:

NWS Guam:
weather.gov/gum

Climate Prediction Center
www.cpc.ncep.noaa.gov/

Joint Typhoon Warning Center
www.metoc.navy.mil/jtwc/jtwc.html

‼️No Tsunami 🌊 Threat‼️

TSUNAMI INFORMATION STATEMENT NUMBER 1
NWS PACIFIC TSUNAMI WARNING CENTER HONOLULU HI
0752 UTC SAT MAY 23 2026

🔶Please be advised of the following Tsunami Information Statement issued by the Pacific Tsunami Warning Center. This is for information only; no action is required.

Event Details:
Event: Earthquake Magnitude: 5.9
Location: Hawaii (19.3 North, 155.9 West)
Time: May 23, 2026 at 07:46 UTC
Evaluation: Based on all available data, there is NO tsunami threat from this earthquake.

🔶No further action is required at this time. More information can be found at tsunami.gov or earthquake.usgs.gov

‼️‼️Flood Advisory for Pohnpei State‼️‼️

‼️Special Weather Update for Pohnpei and Kosrae State‼️

🌱Following , communities across Chuuk’s lagoon islands, , the and regions are facing extensive crop damage and food security concerns with Weno and the lagoon islands most affected. 🌊Saltwater inundation has left taro crops yellowing and inedible while many banana, coconut and fruit trees were felled by the storm.

For families like Mr. Ruben’s, this has far reaching implications for household food consumption given he and his family, like many others in Chuuk’s lagoon and outer islands, rely heavily on their land for sustenance.

Supported by the 🇺🇸U.S. Government, IOM has been assisting Chuuk DCO and FSM DECEM in the delivery of emergency food assistance and is working closely with both agencies to scale up food distributions in the coming months, prioritizing the most severely affected island communities.

Even still, as the weeks following the initial shock of the typhoon progress, many are coming together to clear felled trees and replant with hopes for a healthy harvest next season🥥🌴.

‼️No Tsunami 🌊 Threat‼️

LATEST UPDATE:
TROPICAL STORM HAGUPIT CONTINUES MOVING WEST AND AWAY FROM YAP STATE.

Tropical Storm Warning is cancelled for Ngulu and Yap proper in Yap State.

Movement: West-Northwest at 270 degrees at 10 mph
Maximum sustained winds: 40 mph

TS Hagupit is now about 115 miles west-southwest of Yap proper, continuing to move away from Yap State over the next few days.

Tropical Storm force southeast winds are no longer expected to continue at Yap and Ngulu, in addition to rainfall intensity expected to weaken considerably, as indicated by warming cloud tops along the northeastern flanks of Hagupit.

However, occasional force winds possible near showers gusts up to 40 mph the rest of the day.

Potentially hazardous surf and minor coastal inundation, along with some beach erosion is still expected the rest of today, with surf expected to drop below hazardous levels sometime tonight.

LATEST UPDATE:
Tropical Storm Hagupit Advisory #13 was issued today, May 9th, around 7:30 am. The following message is from the Yap State Disaster Coordinating Office.

TROPICAL STORM HAGUPIT MOVING WEST AND AWAY FROM YAP

TS Hagupit was located...8.9N 136.6E:
About 75 miles northwest of Ngulu
About 110 miles west-southwest of Yap

Movement: West-Northwest at 270 degrees at 10 mph
Maximum sustained winds: 40 mph

Tropical Storm Warning remains in effect for Ngulu and Yap Proper.

A Tropical Storm Warning means that tropical storm conditions,
Including winds of 39 to 73 mph, are expected within 24 hours.

TS Hagupit's maximum sustained wind remains at 40 mph, and it is moving west at 10 mph.

Hagupit is expected to make a slight turn toward the west-northwest with little change in forward speed through Sunday as it continues to move away from Yap. Hagupit is forecast to maintain this intensity through tonight, remaining a weak tropical storm through at least tonight.

Stay tuned for more updates from the Yap State Disaster Coordinating Office. You can also visit our state website at www.yapstate.gov.fm as well as our other social media platforms, Instagram and LinkedIn , for live updates

Tropical Storm Hagupit Advisory #13 was issued today, May 9th, around 7:30 am. The following message is from the Yap State Disaster Coordinating Office.

TROPICAL STORM HAGUPIT MOVING WEST AND AWAY FROM YAP

TS Hagupit was located...8.9N 136.6E:
About 75 miles northwest of Ngulu
About 110 miles west-southwest of Yap

Movement: West-Northwest at 270 degrees at 10 mph
Maximum sustained winds: 40 mph

Tropical Storm Warning remains in effect for Ngulu and Yap Proper.

A Tropical Storm Warning means that tropical storm conditions,
Including winds of 39 to 73 mph, are expected within 24 hours.

TS Hagupit's maximum sustained wind remains at 40 mph, and it is moving west at 10 mph.

Hagupit is expected to make a slight turn toward the west-northwest with little change in forward speed through Sunday as it continues to move away from Yap. Hagupit is forecast to maintain this intensity through tonight, remaining a weak tropical storm through at least tonight.

Stay tuned for more updates from the Yap State Disaster Coordinating Office. You can also visit our state website at www.yapstate.gov.fm as well as our other social media platforms, Instagram and LinkedIn , for live updates