Read the map of the northern hemisphere near-surface weather system (unit: hPa) and answer the following questions. (1) According to the air pressure, ① the ground is _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

(2) ① is the center of high pressure, and the air sinks vertically, so the temperature of the air rises during the sinking process, and the water vapor is not easy to condense, which is a sunny day. (3) The ground is the center of low pressure, the air flow rises vertically, and the temperature of the air decreases during the rising process, and the water vapor in it is easy to condense clouds and cause rain. < P > (3) Specifically, the wind direction is from high pressure to low pressure, and the northern hemisphere deflects to the right, and the northwest wind blows in the figure. The wind power depends on the density of isobars. ② Compared with ④, the wind power is stronger than ②. < P > So the answer is:

(1) high pressure and low pressure

(2) sunny? Rainy

(2) Northwest? ② ② The isobars are dense, and the horizontal pressure gradient force is large.