Experience in observing natural phenomena to predict the weather
Looking around the house, looking at the leaves of garden plants with curly leaves (the grass family) how many nodes (5-7 nodes) roll into the trunk, it is forecasted that there will be many storms in the year. It's cool to see ants moving their nests into the house and onto a big tree, bees entering the house to make nests, snakes entering the house to seek shelter... a big storm is about to happen. Dragonflies or cockroaches fly out, ants under the nest crawl to the top of a tree or on a wall that has a nesting termite is a signal that if there is no storm, there will also be heavy rain for a long time. On the 5th of May (lunar calendar) in the morning, look to the East (towards the sea) to see the termite piles and know how many storms are there in the year, how big and how small they are.
Looking at the black foam is the wind suffocating, there is a thunderstorm, signaling that there is going to be a strong cold. The sky is cloudy and heavy rain is coming. The water turns red, yellow, and crabs should not go far from the shore. When the wind stood still, the waves immediately moved to the shore. If the lime kiln flashes, the pot will be filled with water (East direction), Winter will blink when the cock crows, it will rain, Lightning Doc/Roc will pour the rice out to dry (Northeast direction), Mong East, West rainbow will not rain or wind The sea waves are rolling, the sun is rising in the afternoon, depending on the color of the weather to guess the weather, if it's yellow, it's windy, if it's red, it's rainy, and if it's colored, it's sunny. Many unusual fish and shrimp are also about to have a storm because looking at fish and shrimp often predicts the weather, when a storm is about to happen, they often run around looking for shelter.
Fishermen in Tran Chau, Xuan Dam and Cat Hai islands (Hoang Chau, Gia Loc...) used to work in coastal and offshore seas. In the windy and stormy season, they rested to knit nets. Folk experiences at sea have recorded such as: "Whenever you see the sea floating - there is a storm to come and come back", when the wind turns the leaves, the storm is ready to come in a few days; "Tham Dong, Hach Bac, purple eyebrows, clouds crawling to the sea, this sky is difficult"; "Daughter, remember my father's words - the wind is high and the water is high, don't cross the Don River" (the big river mouth from Cat Hai island to Cat island) Mrs., has high tide, deep creek, today's Lach Huyen deep water port).
Look at the cloudy sky and the direction of the wind: In the Southeast and Northwest, the sea has a continuous flash of lightning close to the water surface, which is a sign of a very big storm coming. When there is a northeast or northwest wind, it is hot and sometimes a wind blows the leaves up, indicating that a storm is about to happen.
The sky is pouring, yellow means wind, red means rain. Clouds are prone to thunderstorms, strong winds, and possibly storms. Western thunderstorms usually come very quickly, heavy rain is very dangerous. In March, the clouds lifted black in the direction of Bac, and the boats tried to get ashore right away because a storm was about to happen. When the sun rose, it turned off immediately, or around the sun appeared fan rays, signaling an approaching storm. The sun, shaped like pangolin scales, also signals an impending stormy weather.