Characteristics of Winter Clouds and Precipitation over the Mountains of Northern Beijing
Table 1
The information of case date, synoptic condition, and snowfall characteristic between 2016 and 2017.
Number of Expt.
Date
Synoptic condition (Height + surface)
Snowfall time Local time (date)
Duration time (hours)
Max snowfall time Local time (date)
Maximum snowfall intensity (mm/h)
Orographic clouds climb to Yan Jiaping?
(1)
2016-01-16
Trough + easterly returning current
1900–0000
0.9
Yes
(2)
2016-01-20/21
Weak trough
2300 (01–20)–0200 (01–21)
No
(3)
2016-11-06/07
Trough + inverted trough
2000 (11–06)–0100 (11–07)
0.8
No
(4)
2016-11-10
Trough + convergence zone
0700–1100
0.9
Yes
(5)
2016-11-20/21
Short-wave trough + counter flow
2000 (11–20)–1100 (11–21)
Yes
(6)
2016-11-29/30
Trough + convergence zone
1600–1800 (11–29), 0000–0600 (11–30)
4, 7
1600 (11–29)
Yes
0200 (11–30)
(7)
2016-12-05
Weak trough + east wind
0300–0700
No
(8)
2016-12-25
Short-wave trough + weak convergence zone
1800–2300
No
(9)
2017-01-07
Vortex + weak inverted trough
0300–1600
Yes
(10)
2017-01-19
Trough + convergence zone
0300–0600
No
(11)
2017-02-21
Low trough + convergence zone
0800–2300
Yes
(12)
2017-03-23/24
Low vortex + inverted trough
1500 (03–23)–1100 (03–24)
0200 (03–24)
Yes
Note. denotes the data collected at Chang Chonggou because Yan Jiaping was disabled. Orographic clouds did not climb to Yan Jiaping but were in the valley.
