Using CINRAD/SA radar data, combined with automatic weather station and sounding data, the formation and radar characteristics of four bow echoes, and straight-line winds caused by bow echoes were analyzed.Two bow echoes evolved from squall lines in early developing stage, two bow echoes evolved from linear heavy rainstorms in weakening stage.The results show that bow echoes from early developing squall lines can produce severe straight-line winds over 25 m·s-1 (10 levels of gales), significantly stronger than the straight-line winds (about 9 levels of gales) caused by bow echoes from weakening linear heavy rainstorms.The abnormal changing of radial velocity or rapidly increasing of the absolute value of radial velocity at middle or low level in the rear of a storm indicate rapidly strengthening of a tilted downdrafts, and will cause the rear inflow notch in low level reflectivity, produce bow echo and damaging straight-line winds.The absolute value of radial velocity ≥27 m·s-1 at middle or low level in the rear of a early developing squall line has a 18～30 minute lead time to the formation of bow echoes.The absolute value of radial velocity ≥25 m·s-1 at middle or low level in the rear of a weakening linear heavy rainstorm has a 6～12 min lead time to the formation of bow echoes.
DIAO Xiuguang
,
MENG Xiangui
,
WAN Mingbo
,
ZHANG Qian
,
LI Jing
. Radar Echo Characteristics and Warning of Bow Echoes Evolved from Early Developing Squall Lines and Weakening Linear Heavy Rainstorms[J]. Plateau Meteorology, 2015
, 34(5)
: 1486
-1494
.
DOI: 10.7522/j.issn.1000-0534.2014.00097
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