Tropical Depression east of Vietnam [former 0721 PEIPAH]

[HURAKAN]

Based on the latest information provided by the JTWC. For official information, consult JMA.

[Squarethecircle]

Ah! Thanks for the graphic; I didn't realize there was such a prominent eye feature. Where's the 967 hPa from, by the way?

[HURAKAN]

21WPEIPAH.75kts-967mb-187N-1181E

NRL: http://www.nrlmry.navy.mil/tc-bin/tc_ho ... w&PROD=geo

The barometric pressure in this case is very unreliable because it's not directly measured but estimated. Nonetheless, the WPAC always has a lower barometric pressure than the Atlantic.

[Squarethecircle]

:uarrow: 21WPEIPAH.75kts-967mb-187N-1181E

NRL: http://www.nrlmry.navy.mil/tc-bin/tc_ho ... w&PROD=geo

The barometric pressure in this case is very unreliable because it's not directly measured but estimated. Nonetheless, the WPAC always has a lower barometric pressure than the Atlantic.

Ah, the NRL. Thanks for that!

[RattleMan]

WTPQ20 RJTD 071500
RSMC TROPICAL CYCLONE ADVISORY
NAME TS 0721 PEIPAH (0721) DOWNGRADED FROM STS
ANALYSIS
PSTN 071500UTC 17.3N 114.9E FAIR
MOVE WSW 10KT
PRES 992HPA
MXWD 045KT
GUST 065KT
30KT 140NM NORTHWEST 80NM SOUTHEAST
FORECAST
24HF 081500UTC 16.3N 112.1E 80NM 70%
MOVE WSW 07KT
PRES 1000HPA
MXWD 035KT
GUST 050KT
45HF 091200UTC 15.3N 110.4E 150NM 70% TROPICAL DEPRESSION =

Code: Select all

WTPN31 PGTW 071500
MSGID/GENADMIN/NAVPACMETOCCEN PEARL HARBOR HI/JTWC//
SUBJ/TROPICAL CYCLONE WARNING   
RMKS/   
1. TROPICAL STORM 21W (PEIPAH) WARNING NR 018   
   DOWNGRADED FROM TYPHOON 21W
   01 ACTIVE TROPICAL CYCLONE IN NORTHWESTPAC
   MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
    ---
   WARNING POSITION:
   071200Z --- NEAR 17.7N 115.6E
     MOVEMENT PAST SIX HOURS - 240 DEGREES AT 11 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
   RADIUS OF 034 KT WINDS - 060 NM NORTHEAST QUADRANT
                            055 NM SOUTHEAST QUADRANT
                            060 NM SOUTHWEST QUADRANT
                            060 NM NORTHWEST QUADRANT
   REPEAT POSIT: 17.7N 115.6E
    ---
   FORECASTS:
   12 HRS, VALID AT:
   080000Z --- 16.9N 114.5E
   MAX SUSTAINED WINDS - 040 KT, GUSTS 050 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   RADIUS OF 034 KT WINDS - 050 NM NORTHEAST QUADRANT
                            045 NM SOUTHEAST QUADRANT
                            050 NM SOUTHWEST QUADRANT
                            050 NM NORTHWEST QUADRANT
   VECTOR TO 24 HR POSIT: 240 DEG/ 07 KTS
    ---
   24 HRS, VALID AT:
   081200Z --- 16.2N 113.3E
   MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   VECTOR TO 36 HR POSIT: 235 DEG/ 07 KTS
    ---
   36 HRS, VALID AT:
   090000Z --- 15.4N 112.1E
   MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER
   VECTOR TO 48 HR POSIT: 240 DEG/ 07 KTS
    ---
   EXTENDED OUTLOOK:
   48 HRS, VALID AT:
   091200Z --- 14.6N 110.8E
   MAX SUSTAINED WINDS - 025 KT, GUSTS 035 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER
   VECTOR TO 72 HR POSIT: 240 DEG/ 07 KTS
    ---
   72 HRS, VALID AT:
   101200Z --- 13.2N 108.3E
   MAX SUSTAINED WINDS - 020 KT, GUSTS 030 KT
   WIND RADII VALID OVER OPEN WATER ONLY
   DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND
    ---
REMARKS:
071500Z POSITION NEAR 17.5N 115.3E.
TROPICAL STORM (TS) 21W (PEIPAH) LOCATED APPROXIMATELY 365 NM WEST-
NORTHWEST OF MANILA, PHILIPPINES, HAS TRACKED WEST-SOUTHWESTWARD AT
11 KNOTS OVER THE PAST 06 HOURS. MAXIMUM SIGNIFICANT WAVE HEIGHT AT
071200Z IS 18 FEET. NEXT WARNINGS AT 072100Z, 080300Z, 080900Z AND
081500Z.//
NNNN

[HURAKAN]

Convection coming back.

[Squarethecircle]

Now a tropical depression from JTWC, 35 knots from JMA, probably not far from being downgraded by them either.

[HURAKAN]

Based on the latest information provided by the JTWC. For official information, consult JMA.

[Chacor]

Still was a TS at 21z from JMA, not a TD.

[HURAKAN]

Looks pretty bad for a tropical storm.

[Chacor]

Was downgraded at 00Z.

06Z: TROPICAL DEPRESSION 1004 HPA AT 13N 111E SW SLOWLY.

[Chacor]

It has redeveloped a very strong burst of convection, which will cause severe rainfall issues in Vietnam, which is already flooded in parts.

[Chacor]

TROPICAL DEPRESSION 1004 HPA AT 12N 111E SSW SLOWLY.

[Squarethecircle]

Look stronger than that, but there have been plenty good looking TDs in the past, and Vietnam is going to get hammered regardless.

[Sanibel]

They are also in the northern hemisphere, so it probably took some cool or dry air from China. For some reason cyclones are interesting in that part of the world to me.

[cycloneye]

The final warning by JTWC.

TROPICAL DEPRESSION 21W (PEIPAH) WARNING NR 026
WTPN31 PGTW 091500
1. TROPICAL DEPRESSION 21W (PEIPAH) WARNING NR 026
01 ACTIVE TROPICAL CYCLONE IN NORTHWESTPAC
MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
---
WARNING POSITION:
091200Z --- NEAR 11.9N 110.6E
MOVEMENT PAST SIX HOURS - 205 DEGREES AT 09 KTS
POSITION ACCURATE TO WITHIN 060 NM
POSITION BASED ON CENTER LOCATED BY SATELLITE
PRESENT WIND DISTRIBUTION:
MAX SUSTAINED WINDS - 025 KT, GUSTS 035 KT
WIND RADII VALID OVER OPEN WATER ONLY
DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER
REPEAT POSIT: 11.9N 110.6E
---
FORECASTS:
12 HRS, VALID AT:
100000Z --- 11.0N 109.3E
MAX SUSTAINED WINDS - 020 KT, GUSTS 030 KT
WIND RADII VALID OVER OPEN WATER ONLY
DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER
VECTOR TO 24 HR POSIT: 250 DEG/ 08 KTS
---
24 HRS, VALID AT:
101200Z --- 10.4N 107.8E
MAX SUSTAINED WINDS - 020 KT, GUSTS 030 KT
WIND RADII VALID OVER OPEN WATER ONLY
DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER
---
REMARKS:
091500Z POSITION NEAR 11.7N 110.3E.

THIS IS THE FINAL WARNING ON THIS SYSTEM BY THE JOINT TYPHOON
WARNING CENTER (NAVPACMETOCCEN). THE SYSTEM WILL BE CLOSELY MON-
ITORED FOR SIGNS OF REGENERATION.
MAXIMUM SIGNIFICANT WAVE HEIGHT AT 091200Z IS 10 FEET.
//

[Chacor]

Gone from JMA.