Overall Green Tropical Cyclone for KOGUMA-26 Off-shore from 05 Oct 2026 00:00 UTC to 18:00

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Overall Green Tropical Cyclone for KOGUMA-26

Off-shore

Global Telecommunication Service

GTS (Global Telecommunication Service) is the official Warning and Alerting channel by the World Meteorological Organization (WMO) adopted by several Warning Organizations. As soon as a new GTS message regarding Tropical Cyclones(WT) or Tsunami(WE) the messages are processed and possibly assigned to the specific event. When a new GTS message is present an new tab in the specific event report page is present.The presence of a GTS message is shown in the homepage with a dedicated icon.

Click on the messages list to visualize on the right the detailed text.

Measurements Levels

SOURCE	GAUGE LOCATION	LAT	LON	TIME (UTC)	HEIGHT (m)	PERIOD (min)

05/10 21:12 WTPQ33PGUM052111

05/10 16:16 WTPQ33PGUM051614

05/10 14:07 WTPN33PGTW051500

05/10 09:17 WTPQ33PGUM050915

05/10 08:04 WTPN33PGTW050900

05/10 03:15 WTPQ33PGUM050313

05/10 01:46 WTPN33PGTW050300

Original Message :

WTPQ33 PGUM 052111
TCPPQ3

BULLETIN
TROPICAL STORM KOGUMA (27W) ADVISORY NUMBER 4
NATIONAL WEATHER SERVICE TIYAN GU WP272026
711 AM CHST TUE OCT 6 2026

...TROPICAL STORM KOGUMA MOVING NORTH-NORTHWEST...

CHANGES WITH THIS ADVISORY
--------------------------
NONE.

WATCHES AND WARNINGS
--------------------
NONE.

SUMMARY OF 700 AM CHST...2100 UTC...INFORMATION
-----------------------------------------------
LOCATION...12.5N 167.4E

ABOUT 190 MILES WEST-NORTHWEST OF UTIRIK
ABOUT 260 MILES NORTH OF KWAJALEIN
ABOUT 270 MILES NORTH-NORTHEAST OF UJAE
ABOUT 285 MILES NORTHWEST OF WOTJE
ABOUT 375 MILES NORTH-NORTHWEST OF AILINGLAPLAP
ABOUT 460 MILES NORTHWEST OF MAJURO
ABOUT 470 MILES SOUTH OF WAKE
ABOUT 1520 MILES EAST OF GUAM

MAXIMUM SUSTAINED WINDS...45 MPH
PRESENT MOVEMENT...NORTH-NORTHWEST...330 DEGREES AT 9 MPH

DISCUSSION AND OUTLOOK
----------------------
AT 700 AM CHST...2100 UTC...THE CENTER OF TROPICAL STORM KOGUMA WAS
LOCATED NEAR LATITUDE 12.5 DEGREES NORTH AND LONGITUDE 167.4 DEGREES
EAST. KOGUMA IS MOVING NORTH-NORTHWEST AT 9 MPH. IT IS EXPECTED TO
MAKE A SLIGHT TURN TOWARD THE NORTHWEST, THEN WEST- NORTHWEST, OVER
THE NEXT FEW DAYS WITH LITTLE CHANGE IN FORWARD SPEED THROUGH
WEDNESDAY.

MAXIMUM SUSTAINED WINDS HAVE INCREASED TO 45 MPH. KOGUMA IS FORECAST
TO SLOWLY INTENSIFY OVER THE NEXT FEW DAYS, POSSIBLY BECOMING A
TYPHOON THURSDAY.

TROPICAL STORM FORCE WINDS EXTEND OUTWARD FROM THE CENTER UP TO
75 MILES.

NEXT ADVISORY
-------------
THE NEXT SCHEDULED ADVISORY WILL BE ISSUED BY THE NATIONAL WEATHER
SERVICE AT 200 PM CHST.

$$

KLEESCHULTE=

Original Message :

WTPQ33 PGUM 051614
TCPPQ3

BULLETIN
Tropical Storm Koguma (27W) Advisory Number 3
National Weather Service Tiyan GU WP272026
214 AM ChST Tue Oct 6 2026

...TROPICAL STORM KOGUMA MOVING NORTH...

CHANGES WITH THIS ADVISORY
--------------------------
None.

WATCHES AND WARNINGS
--------------------
None.

SUMMARY OF 100 AM CHST...1500 UTC...INFORMATION
-----------------------------------------------
Location...11.9N 167.7E

About 155 miles west-northwest of Utirik
About 220 miles north of Kwajalein
About 240 miles northwest of Wotje
About 245 miles north-northeast of Ujae
About 330 miles north-northwest of Ailinglaplap
About 365 miles east of Enewetak
About 415 miles northwest of Majuro
About 515 miles south of Wake
About 555 miles northeast of Kosrae
About 1545 miles east of Guam

Maximum sustained winds...40 mph
Present movement...north...350 degrees at 6 mph

DISCUSSION AND OUTLOOK
----------------------
At 100 AM CHST...1500 UTC...the center of Tropical Storm Koguma
was located near Latitude 11.9 degrees North and Longitude
167.7 degrees East. Koguma is moving north at 6 mph. It is
expected to make a turn toward the northwest with a slight
increase in forward speed through Wednesday. This general forecast
track will take Koguma between Wake Island and the Marianas.

Maximum sustained winds remain at 40 mph. Koguma is forecast to
intensify through Wednesday.

Tropical storm force winds extend outward from the center up to
70 miles to the northwest and up to 35 miles elsewhere.

NEXT ADVISORY
-------------
The next scheduled advisory will be issued by the National
Weather Service at 800 AM ChST.

$$

Stanko

Original Message :

WTPN33 PGTW 051500
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/TROPICAL STORM 27W (KOGUMA) WARNING NR 003//
RMKS/
1. TROPICAL STORM 27W (KOGUMA) WARNING NR 003
03 ACTIVE TROPICAL CYCLONES IN NORTHWESTPAC
MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
WIND RADII VALID OVER OPEN WATER ONLY
---
WARNING POSITION:
051200Z --- NEAR 11.5N 167.9E
MOVEMENT PAST SIX HOURS - 350 DEGREES AT 05 KTS
POSITION ACCURATE TO WITHIN 030 NM
POSITION BASED ON CENTER LOCATED BY SATELLITE
PRESENT WIND DISTRIBUTION:
MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 034 KT WINDS - 000 NM NORTHEAST QUADRANT
000 NM SOUTHEAST QUADRANT
030 NM SOUTHWEST QUADRANT
060 NM NORTHWEST QUADRANT
REPEAT POSIT: 11.5N 167.9E
---
FORECASTS:
12 HRS, VALID AT:
060000Z --- 13.0N 167.1E
MAX SUSTAINED WINDS - 040 KT, GUSTS 050 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 034 KT WINDS - 030 NM NORTHEAST QUADRANT
030 NM SOUTHEAST QUADRANT
030 NM SOUTHWEST QUADRANT
060 NM NORTHWEST QUADRANT
VECTOR TO 24 HR POSIT: 320 DEG/ 08 KTS
---
24 HRS, VALID AT:
061200Z --- 14.2N 166.1E
MAX SUSTAINED WINDS - 045 KT, GUSTS 055 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 034 KT WINDS - 030 NM NORTHEAST QUADRANT
030 NM SOUTHEAST QUADRANT
030 NM SOUTHWEST QUADRANT
060 NM NORTHWEST QUADRANT
VECTOR TO 36 HR POSIT: 310 DEG/ 09 KTS
---
36 HRS, VALID AT:
070000Z --- 15.3N 164.7E
MAX SUSTAINED WINDS - 050 KT, GUSTS 065 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 050 KT WINDS - 030 NM NORTHEAST QUADRANT
030 NM SOUTHEAST QUADRANT
030 NM SOUTHWEST QUADRANT
030 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 040 NM NORTHEAST QUADRANT
040 NM SOUTHEAST QUADRANT
040 NM SOUTHWEST QUADRANT
060 NM NORTHWEST QUADRANT
VECTOR TO 48 HR POSIT: 305 DEG/ 09 KTS
---
EXTENDED OUTLOOK:
48 HRS, VALID AT:
071200Z --- 16.4N 163.1E
MAX SUSTAINED WINDS - 060 KT, GUSTS 075 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 050 KT WINDS - 030 NM NORTHEAST QUADRANT
030 NM SOUTHEAST QUADRANT
030 NM SOUTHWEST QUADRANT
030 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 060 NM NORTHEAST QUADRANT
050 NM SOUTHEAST QUADRANT
050 NM SOUTHWEST QUADRANT
070 NM NORTHWEST QUADRANT
VECTOR TO 60 HR POSIT: 295 DEG/ 12 KTS
---
60 HRS, VALID AT:
080000Z --- 17.4N 160.8E
MAX SUSTAINED WINDS - 070 KT, GUSTS 085 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 064 KT WINDS - 030 NM NORTHEAST QUADRANT
030 NM SOUTHEAST QUADRANT
000 NM SOUTHWEST QUADRANT
030 NM NORTHWEST QUADRANT
RADIUS OF 050 KT WINDS - 040 NM NORTHEAST QUADRANT
040 NM SOUTHEAST QUADRANT
030 NM SOUTHWEST QUADRANT
040 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 070 NM NORTHEAST QUADRANT
060 NM SOUTHEAST QUADRANT
050 NM SOUTHWEST QUADRANT
080 NM NORTHWEST QUADRANT
VECTOR TO 72 HR POSIT: 295 DEG/ 12 KTS
---
72 HRS, VALID AT:
081200Z --- 18.4N 158.4E
MAX SUSTAINED WINDS - 085 KT, GUSTS 105 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 064 KT WINDS - 030 NM NORTHEAST QUADRANT
030 NM SOUTHEAST QUADRANT
020 NM SOUTHWEST QUADRANT
030 NM NORTHWEST QUADRANT
RADIUS OF 050 KT WINDS - 040 NM NORTHEAST QUADRANT
040 NM SOUTHEAST QUADRANT
040 NM SOUTHWEST QUADRANT
040 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 090 NM NORTHEAST QUADRANT
070 NM SOUTHEAST QUADRANT
060 NM SOUTHWEST QUADRANT
090 NM NORTHWEST QUADRANT
VECTOR TO 96 HR POSIT: 295 DEG/ 14 KTS
---
LONG RANGE OUTLOOK:
---
96 HRS, VALID AT:
091200Z --- 20.6N 153.1E
MAX SUSTAINED WINDS - 100 KT, GUSTS 125 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 064 KT WINDS - 030 NM NORTHEAST QUADRANT
030 NM SOUTHEAST QUADRANT
030 NM SOUTHWEST QUADRANT
030 NM NORTHWEST QUADRANT
RADIUS OF 050 KT WINDS - 050 NM NORTHEAST QUADRANT
040 NM SOUTHEAST QUADRANT
040 NM SOUTHWEST QUADRANT
040 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 110 NM NORTHEAST QUADRANT
080 NM SOUTHEAST QUADRANT
070 NM SOUTHWEST QUADRANT
110 NM NORTHWEST QUADRANT
VECTOR TO 120 HR POSIT: 305 DEG/ 13 KTS
---
120 HRS, VALID AT:
101200Z --- 23.4N 148.4E
MAX SUSTAINED WINDS - 105 KT, GUSTS 130 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 064 KT WINDS - 030 NM NORTHEAST QUADRANT
030 NM SOUTHEAST QUADRANT
030 NM SOUTHWEST QUADRANT
030 NM NORTHWEST QUADRANT
RADIUS OF 050 KT WINDS - 060 NM NORTHEAST QUADRANT
050 NM SOUTHEAST QUADRANT
040 NM SOUTHWEST QUADRANT
050 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 120 NM NORTHEAST QUADRANT
110 NM SOUTHEAST QUADRANT
070 NM SOUTHWEST QUADRANT
120 NM NORTHWEST QUADRANT
---
REMARKS:
051500Z POSITION NEAR 11.9N 167.7E.
05OCT26. TROPICAL STORM 27W (KOGUMA), LOCATED APPROXIMATELY 168
NM NORTH OF KWAJALEIN, HAS TRACKED NORTHWARD AT 05 KNOTS OVER THE
PAST SIX HOURS. MINIMUM CENTRAL PRESSURE AT 051200Z IS 1000 MB.
MAXIMUM SIGNIFICANT WAVE HEIGHT AT 051200Z IS 14 FEET. NEXT WARNINGS
AT 052100Z, 060300Z, 060900Z AND 061500Z. REFER TO TYPHOON 15E (NOLO)
WARNINGS (WTPN31 PGTW) FOR SIX-HOURLY UPDATES. REFER TO TYPHOON 26W
(CHOI-WAN) WARNINGS (WTPN32 PGTW) FOR SIX-HOURLY UPDATES.//
NNNN

0000773200
00001

Original Message :

WTPQ33 PGUM 050915
TCPPQ3

BULLETIN
Tropical Storm Koguma (27W) Advisory Number 2
National Weather Service Tiyan GU WP272026
715 PM ChST Mon Oct 5 2026

...KOGUMA UPGRADED TO TROPICAL STORM AND IS MOVING NORTH AWAY FROM
THE REPUBLIC OF THE MARSHAL ISLANDS...

CHANGES WITH THIS ADVISORY
--------------------------
None.

WATCHES AND WARNINGS
--------------------
None.

SUMMARY OF 700 PM CHST...0900 UTC...INFORMATION
-----------------------------------------------
Location...11.3N 167.9E

About 130 miles west of Utirik
About 180 miles north of Kwajalein
About 205 miles northwest of Wotje
About 220 miles northeast of Ujae
About 370 miles northwest of Majuro
About 380 miles east of Enewetak
About 1565 miles east of Guam

Maximum sustained winds...40 mph
Present movement...north...360 degrees at 6 mph

DISCUSSION AND OUTLOOK
----------------------
At 700 PM CHST...0900 UTC...the center of Tropical Storm Koguma
was located near Latitude 11.3 degrees North and Longitude
167.9 degrees East. Koguma is moving north at 6 mph. It is
expected to make a slight turn toward the north-northwest with a
slight increase in forward speed through Tuesday.

Maximum sustained winds have increased to 40 mph. Koguma is
forecast to intensify through Tuesday.

Tropical storm force winds extend outward from the center up to
80 miles.

NEXT ADVISORY
-------------
The next scheduled advisory will be issued by the National
Weather Service at 200 AM ChST early Tuesday morning.

$$

Bowsher

Original Message :

WTPN33 PGTW 050900
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/TROPICAL STORM 27W (KOGUMA) WARNING NR 002//
RMKS/
1. TROPICAL STORM 27W (KOGUMA) WARNING NR 002
UPGRADED FROM TROPICAL DEPRESSION 27W
03 ACTIVE TROPICAL CYCLONES IN NORTHWESTPAC
MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
WIND RADII VALID OVER OPEN WATER ONLY
---
WARNING POSITION:
050600Z --- NEAR 11.0N 168.0E
MOVEMENT PAST SIX HOURS - 360 DEGREES AT 05 KTS
POSITION ACCURATE TO WITHIN 060 NM
POSITION BASED ON CENTER LOCATED BY SATELLITE
PRESENT WIND DISTRIBUTION:
MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 034 KT WINDS - 070 NM NORTHEAST QUADRANT
050 NM SOUTHEAST QUADRANT
060 NM SOUTHWEST QUADRANT
070 NM NORTHWEST QUADRANT
REPEAT POSIT: 11.0N 168.0E
---
FORECASTS:
12 HRS, VALID AT:
051800Z --- 12.3N 167.7E
MAX SUSTAINED WINDS - 045 KT, GUSTS 055 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 034 KT WINDS - 070 NM NORTHEAST QUADRANT
050 NM SOUTHEAST QUADRANT
060 NM SOUTHWEST QUADRANT
070 NM NORTHWEST QUADRANT
VECTOR TO 24 HR POSIT: 330 DEG/ 07 KTS
---
24 HRS, VALID AT:
060600Z --- 13.6N 167.0E
MAX SUSTAINED WINDS - 050 KT, GUSTS 065 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 050 KT WINDS - 030 NM NORTHEAST QUADRANT
020 NM SOUTHEAST QUADRANT
// END PART 01 //

Original Message :

WTPQ33 PGUM 050313
TCPPQ3

BULLETIN
Tropical Depression Koguma (27W) Advisory Number 1
National Weather Service Tiyan GU WP272026
113 PM ChST Mon Oct 5 2026

...TROPICAL DEPRESSION KOGUMA (27W) FORMS WEST-SOUTHWEST OF UTIRIK AND
IS MOVING NORTH...

CHANGES WITH THIS ADVISORY
--------------------------
None.

WATCHES AND WARNINGS
--------------------
None.

SUMMARY OF 100 PM CHST...0300 UTC...INFORMATION
-----------------------------------------------
Location...10.8N 168.0E

About 130 miles west-southwest of Utirik
About 145 miles north of Kwajalein
About 180 miles west-northwest of Wotje
About 200 miles northeast of Ujae
About 340 miles northwest of Majuro
About 385 miles east of Enewetak
About 1575 miles east of Guam

Maximum sustained winds...35 mph
Present movement...northeast...35 degrees at 10 mph

DISCUSSION AND OUTLOOK
----------------------
At 100 PM CHST...0300 UTC...the center of Tropical Depression Koguma
was located near Latitude 10.8 degrees North and Longitude 168.0
degrees East. Koguma is moving northeast at 10 mph. It is expected to
make a turn toward the north-northwest with a slight decrease in
forward speed through Tuesday as it inches closer to Wake Island.

Maximum sustained winds are 35 mph. Koguma is forecast to intensify
through tonight, possibly becoming a tropical storm later today.

NEXT ADVISORY
-------------
The next scheduled advisory will be issued by the National Weather
Service in Tiyan, Guam at 800 PM ChST this evening.

$$

Montvila

Original Message :

WTPN33 PGTW 050300
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/TROPICAL DEPRESSION 27W (KOGUMA) WARNING NR 001//
REF/A/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/040851ZOCT2026//
AMPN/REF A IS A TROPICAL CYCLONE FORMATION ALERT.//
RMKS/
1. TROPICAL DEPRESSION 27W (KOGUMA) WARNING NR 001
03 ACTIVE TROPICAL CYCLONES IN NORTHWESTPAC
MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
WIND RADII VALID OVER OPEN WATER ONLY
---
WARNING POSITION:
050000Z --- NEAR 10.5N 168.0E
MOVEMENT PAST SIX HOURS - 035 DEGREES AT 09 KTS
POSITION ACCURATE TO WITHIN 030 NM
POSITION BASED ON CENTER LOCATED BY SATELLITE
PRESENT WIND DISTRIBUTION:
MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT
WIND RADII VALID OVER OPEN WATER ONLY
REPEAT POSIT: 10.5N 168.0E
---
FORECASTS:
12 HRS, VALID AT:
051200Z --- 11.7N 168.0E
MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 034 KT WINDS - 060 NM NORTHEAST QUADRANT
050 NM SOUTHEAST QUADRANT
000 NM SOUTHWEST QUADRANT
055 NM NORTHWEST QUADRANT
VECTOR TO 24 HR POSIT: 345 DEG/ 07 KTS
---
24 HRS, VALID AT:
060000Z --- 13.0N 167.6E
MAX SUSTAINED WINDS - 040 KT, GUSTS 050 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 034 KT WINDS - 070 NM NORTHEAST QUADRANT
070 NM SOUTHEAST QUADRANT
050 NM SOUTHWEST QUADRANT
050 NM NORTHWEST QUADRANT
// END PART 01 //

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