Characteristic Features of the Evolution of a Meiyu Frontal Rainstorm with Doppler Radar Data Assimilation

Figure 4

Large-scale background at 0000 UTC 4 July 2014: (a) winds (wind barbs, each long barb represents 4 m·s⁻¹, the same hereafter), geopotential height (black solid contours, unit: 10 dgpm), temperature (red dashed lines, unit: °C), and horizontal divergence (shaded in grey, unit: 10⁻⁵·s⁻¹) at 200 hPa, and the yellow frame denotes the key area of the rainstorm; (b) same as (a) but for 500 hPa, and the areas shaded in grey show temperature advection (unit: 10⁻⁵·K·s⁻¹); (c) equivalent potential temperature black solid lines, unit: K; the red lines indicate the isolines of 345 K and vertically integrated precipitable water (unit: mm) at 700 hPa; (d) same as (a) but for 850 hPa, and the shaded areas indicate water vapor flux (unit: m·g·s⁻¹·kg⁻¹).

(a)

(b)

(c)

(d)