JTWC - Tropical Cyclone Warning 042200 - Tropical Depression 26

ABPW10 PGTW 042200
MSGID/GENADMIN/NAVMARFCSTCEN PEARL HARBOR HI/JTWC//
SUBJ/SIGNIFICANT TROPICAL WEATHER ADVISORY FOR THE WESTERN AND
/SOUTH PACIFIC OCEANS REISSUED/042200Z-050600ZSEP2011//
REF/A/MSG/NAVMARFCSTCEN PEARL HARBOR HI/041951ZSEP2011//
AMPN/REF A IS A TROPICAL CYCLONE WARNING.//
RMKS/
1. WESTERN NORTH PACIFIC AREA (180 TO MALAY PENINSULA):
A. TROPICAL CYCLONE SUMMARY:
(1) AT 041800Z, TROPICAL STORM 16W (NORU) WAS LOCATED NEAR
32.5N 149.6E, APPROXIMATELY 620 NM SOUTH- EAST OF MISAWA, JAPAN, AND
HAD TRACKED NORTHWESTWARD AT 17 KNOTS OVER THE PAST SIX HOURS.
MAXIMUM SUSTAINED SURFACE WINDS WERE ESTIMATED AT 35 KNOTS GUSTING
TO 45 KNOTS. SEE REF A (WTPN31 PGTW 042100) FOR FURTHER DETAILS.
(2) NO OTHER TROPICAL CYCLONES.
B. TROPICAL DISTURBANCE SUMMARY: NONE.
(1) AN AREA OF CONVECTION HAS PERSISTED NEAR 16.9N 131.2E,
APPROXIMATELY 600 NM SOUTH-SOUTHEAST OF KADENA AIR BASE, JAPAN, OVER
THE PAST 24 HOURS. ANIMATED INFRARED SATELLITE IMAGERY SHOWS
FORMATIVE BANDING WRAPPING INTO A LOW LEVEL CIRCULATION CENTER
(LLCC), HOWEVER, THE CONVECTIVE BANDING IS LIMITED TO THE SOUTHERN
PERIPHERY. LOW LEVEL STREAMLINE ANALYSIS INDICATES A CLOSED
CIRCULATION WITH A SOUTHWESTERLY WIND FIELD FEEDING INTO THE SYSTEM.
A 041209Z ASCAT PASS SHOWS A WELL-DEFINED AND SYMMETRICAL LLCC WITH
20-KNOT WESTERLY WINDS ON THE SOUTHERN PERIPHERY OF THE SYSTEM, AND
5-10 KNOTS IN ALL OTHER QUADRANTS. UPPER LEVEL ANALYSIS INDICATES
THE SYSTEM LIES DIRECTLY UNDERNEATH A TROUGH AXIS, IN AN AREA OF LOW
(5-10 KT) VERTICAL WIND SHEAR, AND MODERATE DIFFLUENCE. A 041654Z
AMSR-E MICROWAVE IMAGE SHOWS CONVECTIVE BANDING ON THE SOUTHERN
PERIPHERY OF THE LLCC. MAXIMUM SUSTAINED SURFACE WINDS ARE ESTIMATED
AT 15 TO 20 KNOTS. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO BE
NEAR 1007 MB. THE POTENTIAL FOR THE DEVELOPMENT OF A SIGNIFICANT
TROPICAL CYCLONE WITHIN THE NEXT 24 HOURS IS LOW.
(2) NO OTHER TROPICAL DISTURBANCES.
2. SOUTH PACIFIC AREA (WEST COAST OF SOUTH AMERICA TO 135 EAST):
A. TROPICAL CYCLONE SUMMARY: NONE.
B. TROPICAL DISTURBANCE SUMMARY: NONE.
3. JUSTIFICATION FOR REISSUE: ADDED AREA IN PARA 1.B.(1) AS A LOW.//