2515号热带气旋“琵琶”(21W.Peipah)机构发报专帖

ygsj24

No.15 PEIPAH KMA | Issued at(KST) : Fri, 5 Sep 2025, 22:00

Date(UTC)

Intensity

Maximum Sustained Wind(m/s)

Central Pressure (hPa)

Position

Moving Direction

Moving Speed(km/h)

Radius of 15 m/s(km) [Exceptional radius]

Radius of 25 m/s(km) [Exceptional radius]

Radius of 70% probability(km)

m/s

km/h

Lat (N)

Lon (E)

Fri, 5 Sep 2025, 12:00 Analysis

-

L

21

76

994

35.3

142.8

E

48

-

yhh

WTPN31 PGTW 051500
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/TROPICAL STORM 21W (PEIPAH) WARNING NR 009//
RMKS/
1. TROPICAL STORM 21W (PEIPAH) WARNING NR 009   
   01 ACTIVE TROPICAL CYCLONE IN NORTHWESTPAC
   MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
   WIND RADII VALID OVER OPEN WATER ONLY
    ---
   WARNING POSITION:
   051200Z --- NEAR 35.6N 142.9E
     MOVEMENT PAST SIX HOURS - 075 DEGREES AT 30 KTS
     POSITION ACCURATE TO WITHIN 060 NM
     POSITION BASED ON CENTER LOCATED BY SATELLITE
   PRESENT WIND DISTRIBUTION:
   MAX SUSTAINED WINDS - 050 KT, GUSTS 065 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   BECOMING EXTRATROPICAL
   RADIUS OF 050 KT WINDS - 000 NM NORTHEAST QUADRANT
                            060 NM SOUTHEAST QUADRANT
                            070 NM SOUTHWEST QUADRANT
                            000 NM NORTHWEST QUADRANT
   RADIUS OF 034 KT WINDS - 070 NM NORTHEAST QUADRANT
                            150 NM SOUTHEAST QUADRANT
                            130 NM SOUTHWEST QUADRANT
                            060 NM NORTHWEST QUADRANT
   REPEAT POSIT: 35.6N 142.9E
    ---
   FORECASTS:
   12 HRS, VALID AT:
   060000Z --- 36.2N 149.9E
   MAX SUSTAINED WINDS - 055 KT, GUSTS 070 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   EXTRATROPICAL
   RADIUS OF 050 KT WINDS - 030 NM NORTHEAST QUADRANT
                            060 NM SOUTHEAST QUADRANT
                            070 NM SOUTHWEST QUADRANT
                            030 NM NORTHWEST QUADRANT
   RADIUS OF 034 KT WINDS - 150 NM NORTHEAST QUADRANT
                            170 NM SOUTHEAST QUADRANT
                            180 NM SOUTHWEST QUADRANT
                            120 NM NORTHWEST QUADRANT
   VECTOR TO 24 HR POSIT: 085 DEG/ 24 KTS
    ---
   24 HRS, VALID AT:
   061200Z --- 36.4N 155.9E
   MAX SUSTAINED WINDS - 055 KT, GUSTS 070 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   EXTRATROPICAL
   RADIUS OF 050 KT WINDS - 020 NM NORTHEAST QUADRANT
                            060 NM SOUTHEAST QUADRANT
                            070 NM SOUTHWEST QUADRANT
                            020 NM NORTHWEST QUADRANT
   RADIUS OF 034 KT WINDS - 170 NM NORTHEAST QUADRANT
                            190 NM SOUTHEAST QUADRANT
                            180 NM SOUTHWEST QUADRANT
                            150 NM NORTHWEST QUADRANT
    ---
REMARKS:
051500Z POSITION NEAR 35.8N 144.7E.
05SEP25. TROPICAL STORM 21W (PEIPAH), LOCATED APPROXIMATELY 157
NM EAST OF YOKOSUKA, JAPAN, HAS TRACKED EAST-NORTHEASTWARD AT 30
KNOTS OVER THE PAST SIX HOURS. 21W IS CURRENTLY TRANSITIONING INTO
A STORM-FORCE EXTRATROPICAL CYCLONE WITH A DEVELOPING FRONTAL
FEATURE EXTENDING SOUTHWARD FROM THE SYSTEM. A MAJOR SHORTWAVE
TROUGH IS CURRENTLY DIRECTLY TO THE NORTH OF THE SYSTEM, IMPARTING
INCREASED VERTICAL WIND SHEAR AND THERMAL ADVECTION. A 051155Z
METOP-C ASCAT IMAGE REVEALED A HIGHLY ELONGATED CIRCULATION WITH A
SWATH OF 45 KTS CONFINED TO THE SOUTHERN PERIPHERY. 21W IS FORECAST
TO TRACK GENERALLY EASTWARD OVER THE NEXT 24 HOURS WITH
EXTRATROPICAL TRANSITION EXPECTED TO COMPLETE WITHIN THE NEXT 12
HOURS. THIS IS THE FINAL WARNING ON THIS SYSTEM BY THE JOINT TYPHOON
WRNCEN PEARL HARBOR HI. THE SYSTEM WILL BE CLOSELY MONITORED FOR
SIGNS OF REGENERATION. MINIMUM CENTRAL PRESSURE AT 051200Z IS 990
MB. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 051200Z IS 24 FEET.//
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