WTPN31 PGTW 150900
WITH LOW-LEVEL CLOUD LINES WRAPPING INTO A BROAD CENTER. A LINE OF
DEEP CONVECTION OVER THE NORTHERN SEMICIRCLE IS RAPIDLY FRAGMENTING
AND DECAYING DUE TO PERSISTENT STRONG (30 TO 40 KNOTS) EAST-
NORTHEASTERLY VERTICAL WIND SHEAR. SURFACE OBSERVATIONS OVER THE
NORTHERN PERIPHERY OF THE SYSTEM HAVE DECREASED AND NOW RANGE FROM 17
TO 22 KNOTS. SUSTAINED SURFACE WINDS AT SANYA (59948) HAVE ALSO
DECREASED FROM 21 KNOTS (10-MINUTE AVERAGE) TO 18 KNOTS AT 150600Z.
BASED ON THESE SURFACE OBSERVATIONS AND DVORAK ESTIMATES OF T1.0 (RJTD
/ PGTW), THE INITIAL INTENSITY IS ASSESSED AT 25 KNOTS. AS THE SYSTEM
TRACKS WEST-NORTHWESTWARD INTO VIETNAM AND LAOS OVER THE NEXT 12
HOURS, FURTHER WEAKENING IS ANTICIPATED OVER THE MOUNTAINOUS TERRAIN
WITH DISSIPATION LIKELY 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. MINIMUM CENTRAL PRESSURE
AT 150600Z IS 1000 MB. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 150600Z IS
14 FEET.//
????
// END PART 02/02 //