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FY4-True color，Mon 04 Mar 2024 23:45 UTC

South China Sea VIS，Thu 30 Jul 2026 18:15 UTC

24H SURFACE FORECAST，Wed 29 Jul 2026 20:00 UTC

precipitation，Thu 10 Aug 2023 00:00 UTC

10m wind，Tue 17 May 2022 00:00 UTC

24H 500hPa FORECAST，Sat 16 Apr 2022 20:00 UTC

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CAPE

Convective Available Potential Energy：Convective Available Potential Energy, a characterization parameter of convection potential and the greater value is more conducive to the convective weather. CAPE is a measure of instability through the depth of the atmosphere, and is related to updraft strength in thunderstorms. Generally, forecasters refer to "weak instability" (CAPE less than 1000 Jkg-1), "moderate instability" (CAPE from 1000-2500 Jkg-1), "strong instability" (CAPE from 2500-4000 Jkg-1), and "extreme instability" (CAPE greater than 4000 Jkg-1).

Where is the height of the level of free convection and is the height of the equilibrium level(neutral buoyancy), where is the virtual temperature of the specific parcel, where is the virtual temperature of the environment, and where is the acceleration due to gravity.

Wind shear

0-6km vertical shear：The surface to 6 km above ground level change in wind. Thunderstorms tend to become more organized and persistent as vertical shear increases, while supercells are commonly associated with vertical shear values of 20-35 m/s and greater through this depth.

Calculation formula:

Where is the wind of 6 km above ground level and is the surface wind.

PWAT

Total Precipitable Water: a water vapor related parameter indicating hourly rainfall intensities. The numbers represent inches of water as mentioned above for a geographical location. Generally, the greater the value of pwat, the stronger for rainfall intensities.

DCAPE

Downdraft CAPE：DCAPE can be used to estimate the potential strength of rain-cooled downdrafts with thunderstorms convection, and is similar to CAPE. Larger DCAPE values are associated with stronger downdrafts. Generally, forecasters refer to " not conducive to strong wind" (DCAPE less than -500 Jkg-1), " conducive to strong wind" (DCAPE from -500-(-2000)Jkg-1), " very conducive to strong wind" (DCAPE greater than2000 Jkg-1). Certainly, it is effective only in the area where strong convective happens.

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