WTPN33 PGTW 140900 MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI// SUBJ/TROPICAL STORM 18W (NANGKA) WARNING NR 011// RMKS/ 1. TROPICAL STORM 18W (NANGKA) WARNING NR 011 01 ACTIVE TROPICAL CYCLONE IN NORTHWESTPAC MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE WIND RADII VALID OVER OPEN WATER ONLY --- WARNING POSITION: 140600Z --- NEAR 20.2N 106.5E MOVEMENT PAST SIX HOURS - 285 DEGREES AT 11 KTS POSITION ACCURATE TO WITHIN 060 NM POSITION BASED ON CENTER LOCATED BY SATELLITE PRESENT WIND DISTRIBUTION: MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT WIND RADII VALID OVER OPEN WATER ONLY RADIUS OF 034 KT WINDS - 135 NM NORTHEAST QUADRANT 110 NM SOUTHEAST QUADRANT 060 NM SOUTHWEST QUADRANT 070 NM NORTHWEST QUADRANT REPEAT POSIT: 20.2N 106.5E --- FORECASTS: 12 HRS, VALID AT: 141800Z --- 20.4N 104.8E MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT WIND RADII VALID OVER OPEN WATER ONLY DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND VECTOR TO 24 HR POSIT: 260 DEG/ 07 KTS --- 24 HRS, VALID AT: 150600Z --- 20.2N 103.3E MAX SUSTAINED WINDS - 025 KT, GUSTS 035 KT WIND RADII VALID OVER OPEN WATER ONLY DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND VECTOR TO 36 HR POSIT: 255 DEG/ 06 KTS --- 36 HRS, VALID AT: 151800Z --- 19.9N 102.1E MAX SUSTAINED WINDS - 020 KT, GUSTS 030 KT WIND RADII VALID OVER OPEN WATER ONLY DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER LAND --- REMARKS: 140900Z POSITION NEAR 20.2N 106.1E. 14OCT20. TROPICAL STORM 18W (NANGKA), LOCATED APPROXIMATELY 59 NM SOUTHEAST OF HANOI, VIETNAM, HAS TRACKED WEST-NORTHWESTWARD AT 11 KNOTS OVER THE PAST SIX HOURS. MULTISPECTRAL SATELLITE IMAGERY INDICATES THE SYSTEM HAS BECOME SHEARED, WITH THE OUTER LOW-LEVEL BANDS ON THE EAST SIDE BECOMING EXPOSED OVER THE PAST FEW HOURS, WHILE MID-LEVEL ROTATION IS EVIDENT OVER EASTERN VIETNAM. THE INITIAL POSITION IS PLACED WITH MODERATE CONFIDENCE BASED ON ANALYSIS OF THE OUTER BANDS, WITH SUPPORT FROM A 140619Z AMSR2 37 GHZ MICROWAVE IMAGE. THE INITIAL INTENSITY IS ASSESSED AT 35 KNOTS BASED ON MULTI- AGENCY DVORAK INTENSITY ESTIMATES OF T3.0 FROM PGTW AND T2.0 FROM RJTD, SUPPORTED BY AN ADVANCED DVORAK TECHNIQUE ESTIMATE OF T2.3. THE SYSTEM HAS MADE LANDFALL SOUTH OF HAIPHONG, VIETNAM AND WILL CONTINUE TRACKING INLAND WHILE DISSIPATING OVER THE MOUNTAINOUS TERRAIN OF NORTHWEST VIETNAM AND NORTHERN LAOS OVER THE NEXT 36 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. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 140600Z IS 13 FEET.// NNNN