WTPN31 PGTW 120900
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/TROPICAL DEPRESSION 16W (CHAN-HOM) WARNING NR 031//
RMKS/
1. TROPICAL DEPRESSION 16W (CHAN-HOM) WARNING NR 031
02 ACTIVE TROPICAL CYCLONES IN NORTHWESTPAC
MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
WIND RADII VALID OVER OPEN WATER ONLY
---
WARNING POSITION:
120600Z --- NEAR 29.4N 142.4E
MOVEMENT PAST SIX HOURS - 180 DEGREES AT 08 KTS
POSITION ACCURATE TO WITHIN 020 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: 29.4N 142.4E
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FORECASTS:
12 HRS, VALID AT:
121800Z --- 28.7N 142.9E
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: 135 DEG/ 04 KTS
---
24 HRS, VALID AT:
130600Z --- 28.2N 143.5E
MAX SUSTAINED WINDS - 020 KT, GUSTS 030 KT
WIND RADII VALID OVER OPEN WATER ONLY
DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER
---
REMARKS:
120900Z POSITION NEAR 29.2N 142.5E.
12OCT20. TROPICAL DEPRESSION (TD) 16W (CHAN-HOM), LOCATED
APPROXIMATELY 138 NM NORTH OF CHICHI JIMA, HAS TRACKED SOUTHWARD
AT 08 KNOTS OVER THE PAST SIX HOURS. ANIMATED MULTISPECTRAL
SATELLITE IMAGERY DEPICTS A FULLY-EXPOSED SYSTEM WITH LOW-LEVEL
CLOUD LINES WRAPPING INTO A DEFINED CENTER, WHICH SUPPORTS THE
INITIAL POSITION WITH GOOD CONFIDENCE. A 120648Z SSMIS 91GHZ IMAGE
REVEALS SHALLOW BANDING WRAPPING INTO A DEFINED LOW-LEVEL
CIRCULATION CENTER WITH NO DEEP CONVECTION. THE INITIAL INTENSITY IS
ASSESSED AT 25 KNOTS BASED ON RECENT ASCAT DATA. ENVIRONMENTAL
ANALYSIS INDICATES UNFAVORABLE CONDITIONS WITH MODERATE (20-25
KNOTS) VERTICAL WIND SHEAR, CONVERGENCE ALOFT AND SIGNIFICANT DRY
AIR ENTRAINMENT. TD 16W IS FORECAST TO TRACK SOUTHEASTWARD ALONG THE
NORTHEAST PERIPHERY OF THE LOW-LEVEL SUBTROPICAL RIDGE AND IS
FORECAST TO DISSIPATE BY TAU 12. 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. MAXIMUM SIGNIFICANT
WAVE HEIGHT AT 120600Z IS 10 FEET. REFER TO TROPICAL STORM 18W
(NANGKA) WARNINGS (WTPN33 PGTW) FOR SIX-HOURLY UPDATES.//
