Tropical Disturbance 91w
- Strong Low Pressure Area
- 10.9N 112.8E
- moving West @ 17 kph
- 360 NM East of Ho Chi Minh City, Southern Vietnam
- Maximum Sustained Winds: 22 kph
- Gustiness Winds: 32 kph
- Minimum Sea Level Pressure: 1007 MB
- Projected Path: towards Southern Vietnam
THE AREA OF CONVECTION PREVIOUSLY LOCATED NEAR 9.7N
112.4E, IS NOW LOCATED NEAR 10.9N 112.8E, APPROXIMATELY 360 NM EAST
OF HO CHI MINH CITY, VIETNAM. ANIMATED INFRARED SATELLITE IMAGERY
SHOWS PERSISTENT DEEP CONVECTION NEAR THE MONSOON TROUGH AXIS IN THE
SOUTH CHINA SEA. A 241411Z ASCAT PASS REVEALS THAT A PORTION OF THE
NARROW TROUGH HAS FORMED INTO A WEAK, YET SYMMETRIC LOW LEVEL
CIRCULATION CENTER (LLCC). A 241815Z AMSU MICROWAVE IMAGE DEPICTS
CURVED INFLOW AND WEAK BANDING WITH THE BULK OF THE DEEP CONVECTION
STILL TO THE SOUTHWEST OF THE LLCC, SIGNALING THE PRESENCE OF EAST-
NORTHEASTERLY VERTICAL WIND SHEAR (VWS). HOWEVER, THE VWS HAS
STARTED TO RELAX SOME OVER THE LAST 12 HOURS AND IS DOWN TO 15-25
KNOTS. UPPER-AIR SOUNDINGS FROM DA NANG AND HO CHI MINH CITY,
VIETNAM SHOW RELATIVELY WEAK EASTERLY WINDS (5-30 KNOTS) THROUGHOUT
THE COLUMN. ADDITIONALLY, AS THE SYSTEM IS FORMING AND STARTING TO
DRIFT WESTWARD, BOTH DIRECTIONAL AND SPEED SHEAR HAVE DECREASED.
FINALLY, UPPER-AIR ANALYSIS INDICATES THERE IS ALSO INCREASING
DIVERGENCE ALOFT. MAXIMUM SUSTAINED SURFACE WINDS ARE ESTIMATED AT
12 TO 17 KNOTS. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO BE NEAR
1007 MB. DUE TO THE FORMATION OF A WEAK LLCC AND DECREASING VWS, THE
POTENTIAL FOR THE DEVELOPMENT OF A SIGNIFICANT TROPICAL CYCLONE
WITHIN THE NEXT 24 HOURS IS UPGRADED TO FAIR.
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