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Tropical Cyclone LEO : JTWC Advisories
Season 1999-2000 Summaries (Operational Data): [AU] [SIO] [SPAC] [SH]
---> Tropical Cyclone LEO Track Map and Data

WTPS 31 PHNC 20000306 21:00z    
1. TROPICAL CYCLONE 18P (LEO) WARNING NR 001    
   04 ACTIVE TROPICAL CYCLONES IN SOUTHEASTPAC
   MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
    ---
   WARNING POSITION:
   061800Z5 --- NEAR 25.6S3 165.2W4
     MOVEMENT PAST SIX HOURS - 235 DEGREES AT 20 KTS
     POSITION ACCURATE TO WITHIN 060 NM
     POSITION BASED ON CENTER LOCATED BY SATELLITE
   PRESENT WIND DISTRIBUTION:
   MAX SUSTAINED WINDS - 055 KT, GUSTS 070 KT
   RADIUS OF 050 KT WINDS - 030 NM SOUTHEAST SEMICIRCLE  
                            020 NM NORTHWEST SEMICIRCLE  
   RADIUS OF 035 KT WINDS - 090 NM SOUTHEAST SEMICIRCLE  
                            070 NM NORTHWEST SEMICIRCLE  
   REPEAT POSIT: 25.6S3 165.2W4
    ---
   FORECASTS:
   12 HRS, VALID AT:
   070600Z3 --- 27.8S7 167.7W1
   MAX SUSTAINED WINDS - 060 KT, GUSTS 075 KT
   RADIUS OF 050 KT WINDS - 030 NM SOUTHEAST SEMICIRCLE  
                            020 NM NORTHWEST SEMICIRCLE  
   RADIUS OF 035 KT WINDS - 090 NM SOUTHEAST SEMICIRCLE  
                            070 NM NORTHWEST SEMICIRCLE  
   VECTOR TO 24 HR POSIT: 195 DEG/ 14 KTS
    ---
   24 HRS, VALID AT:
   071800Z6 --- 30.4S7 168.6W1
   MAX SUSTAINED WINDS - 055 KT, GUSTS 070 KT
   RADIUS OF 050 KT WINDS - 030 NM SOUTHEAST SEMICIRCLE  
                            020 NM NORTHWEST SEMICIRCLE  
   RADIUS OF 035 KT WINDS - 090 NM SOUTHEAST SEMICIRCLE  
                            070 NM NORTHWEST SEMICIRCLE  
   VECTOR TO 36 HR POSIT: 155 DEG/ 12 KTS
    ---
   36 HRS, VALID AT:
   080600Z4 --- 32.5S0 167.5W9
   MAX SUSTAINED WINDS - 045 KT, GUSTS 055 KT
   BECOMING EXTRATROPICAL
   RADIUS OF 035 KT WINDS - 080 NM SOUTHEAST SEMICIRCLE  
                            060 NM NORTHWEST SEMICIRCLE  
   VECTOR TO 48 HR POSIT: 135 DEG/ 26 KTS
    ---
   EXTENDED OUTLOOK:
   48 HRS, VALID AT:
   081800Z7 --- 36.0S9 163.0W0
   MAX SUSTAINED WINDS - 040 KT, GUSTS 050 KT
   BECOMING EXTRATROPICAL
   RADIUS OF 035 KT WINDS - 080 NM SOUTHEAST SEMICIRCLE  
                            060 NM NORTHWEST SEMICIRCLE  
    ---
REMARKS: LATEST SATETLLITE IMAGERY CONTINUES TO INDICATE
INCREASING CONVECTIVE ORGANIZATION. AS THIS SYSTEM WILL
BEGIN TO MOVE OVER COOLER SEA SURFACE TEMPERATUES AND
INTO A WEAK SHEARING ENVIRONMENT WITHINN THE NEXT 24 HOURS.
FORECAST AIDS REMAIN IN GOOD AGREEMENT THROUGH FORECAST.
MAXIMUM SIGNIFICANT WAVE HEIGHT AT 061800Z IS 18 FEET.
THIS WARNING SUPERSEDES AND CANCELS NAVPACMETOCCEN
060830Z MAR 00 TROPICAL CYCLONE FORMATION ALERT
(WTPS21 PHNC 060900) NEXT WARNINGS AT 070900Z6 AND 072100Z0.//
=========================================================================
WTPS31 PHNC 20000307 09:00z
1. TROPICAL CYCLONE 18P (LEO) WARNING NR 002
   03 ACTIVE TROPICAL CYCLONES IN SOUTHEASTPAC
   MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
    ---
   WARNING POSITION:
   070600Z3 --- NEAR 29.5S6 165.9W1
     MOVEMENT PAST SIX HOURS - 185 DEGREES AT 25 KTS
     POSITION ACCURATE TO WITHIN 060 NM
     POSITION BASED ON CENTER LOCATED BY SATELLITE
   PRESENT WIND DISTRIBUTION:
   MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT
   REPEAT POSIT: 29.5S6 165.9W1
    ---
   FORECASTS:
   12 HRS, VALID AT:
   071800Z6 --- 33.3S9 166.6W9
   MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT
   BECOMING EXTRATROPICAL
   VECTOR TO 24 HR POSIT: 170 DEG/ 18 KTS
    ---
   24 HRS, VALID AT:
   080600Z4 --- 36.8S7 165.7W9
   MAX SUSTAINED WINDS - 025 KT, GUSTS 035 KT
   BECOMING EXTRATROPICAL
   VECTOR TO 36 HR POSIT: 135 DEG/ 25 KTS
    ---
   36 HRS, VALID AT:
   081800Z7 --- 40.1S5 161.0W8
   MAX SUSTAINED WINDS - 025 KT, GUSTS 035 KT
   EXTRATROPICAL
    ---
REMARKS:
LATEST SATELLITE IMAGERY INDICATES LEO IS STARTING TO RECURVE AND
WEAKEN OVER THE LAST 6 TO 12 HOURS. THIS SYSTEM IS MOVING INTO
INCREASED SHEAR DUE TO A COLD FRONT TO THE SOUTH. AS THIS COLD
FRONT PASSES BY, LEO WILL START TO MOVE MORE WESTERLY AND BECOME
EXTRA-TROPICAL BY 36 HOURS.  MAXIMUM SIGNIFICANT WAVE HEIGHT AT
070600Z IS 15 FEET. REFER TO WWPN30 PHNC FOR ADDITIONAL SEA
HEIGHT INFORMATION.
=========================================================================
WTPS 31 PHNC 20000307 21:00z    
1. TROPICAL CYCLONE 18P (LEO) WARNING NR 003    
   03 ACTIVE TROPICAL CYCLONES IN SOUTHERN HEMISPHERE
   MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
    ---
   WARNING POSITION:
   071800Z6 --- NEAR 33.6S2 166.6W9
     MOVEMENT PAST SIX HOURS - 185 DEGREES AT 20 KTS
     POSITION ACCURATE TO WITHIN 045 NM
     POSITION BASED ON CENTER LOCATED BY SATELLITE
   PRESENT WIND DISTRIBUTION:
   MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT
   RADIUS OF 035 KT WINDS - 080 NM SOUTHEAST SEMICIRCLE  
                            060 NM NORTHWEST SEMICIRCLE  
   REPEAT POSIT: 33.6S2 166.6W9
    ---
   FORECASTS:
   12 HRS, VALID AT:
   080600Z4 --- 36.9S8 165.7W9
   MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT
   BECOMING EXTRATROPICAL
   RADIUS OF 035 KT WINDS - 070 NM SOUTHEAST SEMICIRCLE  
                            050 NM NORTHWEST SEMICIRCLE  
   VECTOR TO 24 HR POSIT: 130 DEG/ 25 KTS
    ---
   24 HRS, VALID AT:
   081800Z7 --- 40.0S4 160.7W4
   MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT
   BECOMING EXTRATROPICAL
   VECTOR TO 36 HR POSIT: 115 DEG/ 41 KTS
    ---
   36 HRS, VALID AT:
   090600Z5 --- 43.2S9 150.5W1
   MAX SUSTAINED WINDS - 025 KT, GUSTS 035 KT
   EXTRATROPICAL
    ---
REMARKS: LATEST SATELLITE IMAGERY CONTINUES TO INDICATE 
THAT THE SYSTEM IS WEAKENING. TC 18P (LEO) IS EXPECTED
TO COMPLETE EXTRATROPICAL TRANSISTION BY THE 36 HOUR
FORECAST PERIOD AS IT BECOMES ABSORBED INTO AN 
APPROACHING COLD FRONT. MAXIMUM SIGNIFICANT WAVE HEIGHT
AT 071800Z IS 14 FEET. REFER TO TROPICAL CYCLONE 16S
(NORMAN) WARNINGS (WTXS32 PGTW) FOR TWELVE-HOURLY
UPDATES. REFER TO TROPICAL CYCLONE 14P (STEVE) WARNINGS
(WTXS35 PGTW) FOR SIX-HOURLY UPDATES. NEXT WARNINGS AT 
080900Z7 AND 082100Z1.//
=========================================================================
WTPS 31 PHNC 20000308 09:00z    
1. TROPICAL CYCLONE 18P (LEO) WARNING NR 004    
   04 ACTIVE TROPICAL CYCLONES IN SOUTHEASTPAC
   MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
    ---
   WARNING POSITION:
   080600Z4 --- NEAR 39.9S1 164.2W3
     MOVEMENT PAST SIX HOURS - 155 DEGREES AT 35 KTS
     POSITION ACCURATE TO WITHIN 060 NM
     POSITION BASED ON CENTER LOCATED BY SATELLITE
   PRESENT WIND DISTRIBUTION:
   MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT
   BECOMING EXTRATROPICAL
   REPEAT POSIT: 39.9S1 164.2W3
    ---
   FORECASTS:
   12 HRS, VALID AT:
   081800Z7 --- 44.1S9 158.2W6
   MAX SUSTAINED WINDS - 025 KT, GUSTS 035 KT
   BECOMING EXTRATROPICAL
   VECTOR TO 24 HR POSIT: 125 DEG/ 28 KTS
    ---
   24 HRS, VALID AT:
   090600Z5 --- 47.0S1 151.2W9
   MAX SUSTAINED WINDS - 020 KT, GUSTS 030 KT
   EXTRATROPICAL
    ---
REMARKS:
LATEST SATELLITE IMAGERY INDICATES CONTINUED WEAKENING ACROSS THE
SYSTEM AS IT IS ABSORBED INTO THE COLD FRONT. LEO IS EXPECTED TO
BECOMING EXTRA-TROPICAL IN THE NEXT 24 HOURS.  MAXIMUM
SIGNIFICANT WAVE HEIGHT AT 080600Z IS 12 FEET. REFER TO WWPN30
PHNC FOR ADDITIONAL SEA HEIGHT INFORMATION.
THIS IS THE FINAL WARNING ON THIS SYSTEM BY THE NAVAL PACIFIC
METEOROLOGY AND OCEANOGRAPHY CENTER (NAVPACMETOCCEN).  THE SYSTEM
WILL BE CLOSELY MONITORED FOR SIGNS OF REGENERATION.//

Tropical cyclone tracks developed by Michael Bath using operational warnings and advisories.


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Document: tropical_cyclone_leo_jtwc_advisories.htm Updated: 4 September 2016