咋天下午2時,香港天文台將91w升為熱帶低壓,

但到今天早上11時,就已把它降為低壓區了

很大一坨對流
話說NRL網站一直進不去

JTWC評級Low

(1) AN AREA OF CONVECTION (INVEST 91W) HAS PERSISTED NEAR 9.2N
110.8E, APPROXIMATELY 245 NM EAST-SOUTHEAST OF HO CHI MINH CITY,
VIETNAM. ANIMATED MULTISPECTRAL SATELLITE IMAGERY AND AN 112324Z
SSMIS 91GHZ MICROWAVE IMAGE SHOW A PARTIALLY EXPOSED BROAD LOW LEVEL
CIRCULATION CENTER (LLCC) WITH BANDING AND FLARING CONVECTION
LOCATED PRIMARILY TO THE NORTH AND WEST. AN 11146Z ASCAT PARTIAL
PASS SHOWS A BROAD CIRCULATION WITH HIGHER WINDS TO THE SOUTH. THE
DISTURBANCE IS CURRENTLY LOCATED IN AN AREA OF MODERATE
ENVIRONMENTAL CONDITIONS DUE PRIMARILY TO MODERATE VERTICAL WIND
SHEAR, BUT OFFSET BY WARM SEA SURFACE TEMPERATURES AND GOOD
DIFFLUENCE ALOFT. GLOBAL MODELS ARE NOT DEPICTING FURTHER
DEVELOPMENT AT THIS TIME. MAXIMUM SUSTAINED SURFACE WINDS ARE
ESTIMATED AT 15 TO 20 KNOTS. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED
TO BE NEAR 1005 MB. THE POTENTIAL FOR THE DEVELOPMENT OF A
SIGNIFICANT TROPICAL CYCLONE WITHIN THE NEXT 24 HOURS IS LOW.

JMA 18Z已發布Warning

WWJP25 RJTD 101800

WARNING.
TROPICAL DEPRESSION 1004 HPA
AT 09.0N 110.0E SOUTH CHINA SEA ALMOST STATIONARY.