SUBJ: TROPICAL CYCLONE WARNING WTPN31 PGTW 150300 1. TROPICAL DEPRESSION 07W WARNING NR 009 01 ACTIVE TROPICAL CYCLONES IN NORTHWESTPAC MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE --- WARNING POSITION: 150000Z6 --- NEAR 17.6N4 117.6E5 MOVEMENT PAST SIX HOURS - 305 DEGREES AT 15 KTS POSITION ACCURATE TO WITHIN 120 NM POSITION BASED ON CENTER LOCATED BY A COMBINATION OF SATELLITE, SYNOPTIC DATA AND EXTRAPOLATION PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 020 KT, GUSTS 030 KT DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER REPEAT POSIT: 17.6N4 117.6E5 --- FORECASTS: 12 HRS, VALID AT: 151200Z9 --- 19.7N7 115.4E1 MAX SUSTAINED WINDS - 020 KT, GUSTS 030 KT DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER --- REMARKS: 150300Z9 POSITION NEAR 18.1N0 117.1E0. TROPICAL DEPRESSION (TD) 07W, LOCATED 164 NM WEST OF PORT SAN ESTABAN IN THE PHILIPPINES HAS TRACKED WEST-NORTHWESTWARD AT 15 KNOTS DURING THE PAST 6 HOURS. THE WARNING POSITION IS BASED ON 142330Z3 VISIBLE AND INFRARED SATELLITE IMAGERY, AVAILABLE SYNOPTIC DATA, AND EXTRAPOLATION FROM PREVIOUS POSITIONS. THE WARNING INTENSITY IS BASED ON CURRENT SATELLITE INTENSITY ESTIMATES OF 20 KNOTS AND SYNOPTIC REPORTS OF 15 TO 20 KNOTS. ANIMATED VISIBLE SATELLITE IMAGERY INDICATES NO LOW LEVEL CYCLONIC CIRCULATION (LLCC) EVIDENT. SECONDARY LLCC WITH NO ASSOCIATED CONVECTION MAY BE LOCATED NEAR 19.5N5 116.2E0 BUT DOES NOT APPEAR TO BE RELATED TO TD 07W AS IT IS LOCATED TOO FAR NORTHWEST AND WOULD INDICATE A FORWARD MOTION OF 30+ KNOTS. UW-CIMSS ANALYSIS INDICATES PERSISTENT MODERATE TO STRONG EAST-NORTHEASTERLY VERTICAL WIND SHEAR OVER THE SYSTEM THAT HAS INHIBITED ANY DEVELOPMENT OF TD 07W ONCE CROSSING LUZON. A LARGE SCALE MONSOON CIRCULATION IS CENTERED OVER THE SOUTH CHINA SEA AND DOMINATES THE LOW LEVEL STEERING FLOW IN THIS REGION. FORECAST TRACK CONTINUES WEST-NORTHWESTWARD ALONG THE NORTHERN PERIPHERY OF THE MONSOON TROUGH TO THE 12 HOUR FORECAST AS THIS SYSTEM DISSIPATES OVER WATER. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 150000Z6 IS 08 FEET. REFER TO WWPW31 RJTX FOR ADDITIONAL SEA HEIGHT INFORMATION. THIS IS THE FINAL WARNING ON THIS SYSTEM BY THE JOINT TYPHOON WARNING CENTER (NAVPACMETOCCEN). THE SYSTEM WILL BE CLOSELY MONITORED FOR SIGNS OF REGENERATION.// NNNN