Journal of Arid Meteorology

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1 干旱气象 Journal of Arid Meteorology Vol. 32 No. 3 June J LIU Yong GUO Damei HU Qiyuan. Cause Analysis of an Extremely Heavy Rainstorm in Jiaxian County in the North Shaanxi Province on July 27th 2012 J. Journal of Arid Meteorology doi /j. issn NCEP hpa 850 hpa 200 hpa 200 ~ 400 km h - α - α doi /j. issn P A - β hpa E 38 N 12 h mm ~ h mm mm 24 h E - mail liuy1962@ 126. com

3 2012 7 27 425 1 7 27 02 00 FY - 2 1 h 11. 8 mm 03 00 150 km - 42 1 h 30 mm 04 00 2a 200 km - 52 10 1 2012 7 27 02 00 ~ 13 00 1 h 50 mm Fig.

2 FY h mm km h 30 mm a 200 km ~ h 50 mm Fig. 1 The hourly precipitation from to on July in Jiaxian County of Shaanxi Province mm /h 59 mm /h b - α 350 km h 60 mm α 400 km ~ h 1 h 44 mm ~ c km 2 32 mm /h d - α α - 32 Fig a b c d FY - 2 The TBB of FY - 2 infrared cloud images at a b c and d on July

426 32 FY - 2 - α 200 ~ 400 km - 60 14 h 584 dagpm 2 2012 7 26 20 00 500 hpa 3a 42 N ~ 44 N 500 588 dagpm hpa 584 dagpm 40

3 The 500 hpa height fields at 20 00 on 26 July a and 08 00 b on 27 July 2012 27 08 00 850 hpa 4b 27 08 00 700 hpa 4a 4 m

3 FY α 200 ~ 400 km h 584 dagpm hpa 3a 42 N ~ 44 N dagpm hpa 584 dagpm 40 N 100 E hpa hpa 3b 584 dagpm a b 500 hpa Fig. 3 The 500 hpa height fields at on 26 July a and b on 27 July hpa 4b hpa 4a 4 m s m s m s m s hpa a 850 hpa b Fig. 4 The 700 hpa a and 850 hpa b height fields at on 27 July 2012

3 2012 7 27 427 26 20 00 200 hpa 5a 200 hpa 48 m s - 1 44 m s - 1 584 dagpm 588 dagpm 27 08 00 200 hpa 5b 8 m s - 1 10 m s - 1 700 hpa 850 hpa 200 hpa Fig.

4 hpa 5a 200 hpa 48 m s m s dagpm 588 dagpm hpa 5b 8 m s m s hpa 850 hpa 200 hpa Fig a b 200 hpa The 200 hpa height fields at on 26 July a and on 27 July 2012 b hpa a hpa s hpa 850 hpa a b 500 hpa 10-5 Fig. 6 The temperature advection on 500 hpa at on 26 July a and on 27 July b 2012 Unit 10-5 s - 1 s - 1

5 b 500 hpa 40 g cm s - 1 hpa - 1 s hpa hpa - 1 s g cm - 2 hpa - 1 s hpa g cm - 2 hpa - 1 s a 700 hpa g cm - 2 hpa - 1 s hpa ~ 120 g cm - 1 hpa - 1 s hpa 20 ~ 40 g cm - 1 hpa - 1 s hpa hpa 7b 60 ~ hpa 700 hpa g cm hpa 10-7 g cm - 2 hpa - 1 s g cm - 1 hpa - 1 s g cm - 1 hpa - 1 s Fig a b 700 hpa g cm - 1 hpa - 1 s - 1 Water vapor flux on 700 hpa at on 26 July a and on 27 July b 2012 Unit g cm - 1 hpa - 1 s a 850 hpa CAPE J kg K 45 θ se500 - θ se hpa CAPE 1 = J kg - 1 θ se500 - θ se850 =

3 2012 7 27 429 27 08 00 8b CAPE 518 J kg - 1 θ se500 - θ se850 = - 5 CAPE 664 J kg - 1 θ se500 - θ se850 = - 10-0. 71 K 38-1. 25 CAPE 500 hpa 8 2012 7 26 20 00 a 27 08 00 b Fig.

6 b CAPE 518 J kg - 1 θ se500 - θ se850 = - 5 CAPE 664 J kg - 1 θ se500 - θ se850 = K CAPE 500 hpa a b Fig. 8 The T - lnp chart at on 26 July a and on 27 July b 2012 at Yan an station hpa hpa E 9a 38 N 0 ~ s hpa 0 ~ s hpa hpa 0 ~ s hpa s ~ s - 1 s b850 ~ 700 hpa 9 Fig a b 110 E 10-5 s - 1 The cross section of divergence along 110 E at on 26 July a and on 27 July b 2012 Unit 10-5 s - 1

7 E 10a 26 hpa hpa s hpa b 400 Fig a b 110 E 10-3 hpa s - 1 The cross section of vertical velocity along 110 E at on 26 July a and on 27 July b 2012 Unit 10-3 hpa s J hpa hpa 850 hpa 700 hpa hpa 850 hpa ~ 400 km h - α hpa J J J J J J J J J J ( 下转至第 438 页 )

8 Characteristic of a Rare Moving Left Supercell Storm YE GengxinLIU ZhuanghuaLIU Guoyu Tonghua Meteorological Bureau of Jilin ProvinceTonghua China Abstract A study of a left moving supercell storm which occurred in the southern part of Jilin Province on July was made based on the Baishan Doppler weather radar data routine upper air observationand intensive automatic weather station observation. The results show that this weather process occurred in the deep northeast cold vortex southeast quadrant and near the north side of the super strong high - altitude jet cores low - level vertical wind shear was not strong and convective available potential energy was not large then. There was a strong warm advection in low level and a wind shear area from southwest to northeast. Low - level convergenceupper - level divergencenear the dew point front and upper - level jet cores were all conducive to convective development. There was always a meso - β - scale about 120 km anti - cyclonic circulation when the storm developedits rotating radius increased gradually from upper to low level and it was stretched into an oval structure in SSE directionand the storm occurred in the SSW airflow in the northwest quadrant of the circulationand showed a hook echoweak echo regionanti meso cyclone and other characteristics of supercell. Anti - meso - cyclone appeared in the strong developing period of the stormand its gyration radius gradually increased from low to high layer. Hail occurred in front of the strongest inflow and strongest period of the stormand strong cooling and instantaneous gale disasters weather happened when the storm passed by. Key words northeast cold vortex supercell hook echo left moving storm anti meso cyclones upper jet 檮檮檮檮檮檮檮檮檮檮檮檮檮檮檮檮檮檮檮檮檮檮檮檮檮檮檮檮檮檮檮檮檮檮檮檮檮檮檮檮檮檮檮檮檮檮 ( 上接第 430 页 ) Cause Analysis of an Extremely Heavy Rainstorm in Jiaxian County in the North Shaanxi Province on July LIU Yong GUO Damei HU Qiyuan Shaanxi Meteorology ObservatoryXi an China Abstract Based on the routine observation datahourly rainfall dataphysical quantity fields and satellite images as well as NCEP reanalysis dataan extremely heavy rainstorm in Jiaxian County in the north Shaanxi Province on July was analyzed. The conclusions are as follows In the early stage of rainstorm the subtropical high was strongerwhen the cold air from westerly zone encountered the southwest warm and moist air from the northwest of subtropical highconvection was triggered. The southwest airflow on 700 hpa and the southeast airflow on 850 hpa provided a relatively abundant water vapor for the rainstorm. There were lots of unstable energy in the lower leveland on the level of 200 hpa the north of Shaanxi Province was located in the front of the shallow trough and the right side of the jet stream s entrancewhere positive vorticity advection and strong divergence existedwhich resulted in a strong vertical movement. On the satellite cloud images there was a meso - α - scale convective cloud clusterwhose horizontal scale was from 200 to 400 kmand the lowest brightness temperature was - 60 and sustained time was 14 hours. Key words heavy rainstorm unstable energy positive vorticity advection meso - α - scale convective cloud clusters

Using Satellite Data to Analyze the Initiation and Evolution of Deep Convective Clouds

Atmospheric and Oceanic Science Letters ISSN: 674-2834 (Print) 2376-623 (Online) Journal homepage: https://www.tandfonline.com/loi/taos20 Using Satellite Data to Analyze the Initiation and Evolution of