Factors and Phenomena for Meteorological and Hydrological Forecasting and Warning

21:32, 10/07/2024

On December 19, 2016, the Ministry of Natural Resources and Environment issued Circular 40/2016/TT-BTNMT stipulating the technical process for meteorological and hydrological forecasting and warning under normal conditions.

Circular 40/2016/TT-BTNMT stipulates the factors and phenomena for meteorological and hydrological forecasting and warning as follows:

1. Meteorological factors and phenomena

- Clouds: Cloud cover, cloud type, cloud base height;- Rain: Rain type and classification, possibility of rain, rainfall amount, spatial distribution of rain, temporal distribution of rain;- Temperature: Average temperature, highest temperature, lowest temperature, absolute highest temperature, absolute lowest temperature;- Wind: Wind direction, wind speed;- ...

2. Hydrological factors and phenomena

- River water level: Highest water level, lowest water level, average water level, water level amplitude, time of occurrence;- Reservoir water level: Inflow to the reservoir, discharge flow;- Water flow: Highest flow, lowest flow, average flow;- Salinity: Highest salinity, lowest salinity, average salinity, saline intrusion distance;- Other related hydrological phenomena.

3. Oceanographic factors and phenomena

- Sea waves: Wave height, wave direction;- Tides: High tide, low tide, time of occurrence;- Storm surges: Surge height, time of occurrence;- Surface ocean currents: Average velocity, predominant direction;- Other related oceanographic factors and phenomena.

Circular 40/2016/TT-BTNMT is effective from February 10, 2017.

- Thanh Lam -

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