干旱区生态环境知识资源中心(Arid): Atmospheric conditions leading to an exceptional fatal flash flood in the Negev Desert, Israel

Arid

DOI	10.5194/nhess-21-1583-2021
	Atmospheric conditions leading to an exceptional fatal flash flood in the Negev Desert, Israel
	Dayan, Uri; Lensky, Itamar M.; Ziv, Baruch; Khain, Pavel
通讯作者	Dayan, U (corresponding author), Hebrew Univ Jerusalem, Dept Geog, IL-9070227 Jerusalem, Israel. ; Lensky, IM (corresponding author), Bar Ilan Univ, Dept Geog & Environm, IL-5290002 Ramat Gan, Israel.
来源期刊	NATURAL HAZARDS AND EARTH SYSTEM SCIENCES
ISSN	1561-8633
EISSN	1684-9981
出版年	2021
卷号	21 期号:5 页码:1583-1597
英文摘要	The study deals with an intense rainstorm that hit the Middle East between 24 and 27 April 2018 and took the lives of 13 people, 10 of them on 26 April during the deadliest flash flood in Tzafit Basin (31.0 degrees N, 35.3 degrees E), the Negev Desert. The rainfall observed in the southern Negev was comparable to the long-term annual rainfall there, with intensities exceeding a 75-year return period. The timing of the storm, at the end of the rainy season when rain is relatively rare and spotty, raises the question of what the atmospheric conditions were that made this rainstorm one of the most severe late-spring storms. The synoptic background was an upper-level cut-off low that formed south of a blocking high which developed over eastern Europe. The cut-off low entered the Levant near 30 degrees N latitude, slowed its movement from similar to 10 to < 5 m s(-1) and so extended the duration of the storm over the region. The dynamic potential of the cut-off low, as estimated by its curvature vorticity, was the largest among the 12 latespring rainstorms that occurred during the last 33 years. The lower levels were dominated by a cyclone centred over northwestern Saudi Arabia, producing north-westerly winds that advected moist air from the Mediterranean inland. During the approach of the storm, the atmosphere over Israel became unstable, with instability indices reaching values favourable for thunderstorms (e.g. CAPE > 1500 J kg(-1), LI = 4 K) and the precipitable water reaching 30 mm. The latter is explained by lower-level moisture advection from the Mediterranean and an additional contribution of mid-level moist air transport entering the region from the east. Three major rain centres were active over Israel during 26 April, only one of them was oro- graphic and the other two were triggered by instability and mesoscale cyclonic centres. The build-up of the instability is explained by a negative upper-level temperature anomaly over the region caused by a northerly flow east of a blocking high that dominated eastern Europe and ground warming during several hours under clear skies. The intensity of this storm is attributed to an amplification of a mid-latitude disturbance which produced a cut-off low with its implied high relative vorticity, low upper-level temperatures and slow progression. All these, combined with the contribution of moisture supply, led to intense moist convection that prevailed over the region for 3 successive days.
类型	Article
语种	英语
开放获取类型	Green Submitted, gold
收录类别	SCI-E
WOS记录号	WOS:000656107300002
WOS关键词	LARGE-SCALE ; RAINFALL ; INTENSITY ; CLASSIFICATION ; PRECIPITATION ; CONVECTION ; REANALYSIS ; LOCATION ; PATTERNS ; SYSTEMS
WOS类目	Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences ; Water Resources
WOS研究方向	Geology ; Meteorology & Atmospheric Sciences ; Water Resources
来源机构	Hebrew University of Jerusalem
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/351186
作者单位	[Dayan, Uri] Hebrew Univ Jerusalem, Dept Geog, IL-9070227 Jerusalem, Israel; [Lensky, Itamar M.] Bar Ilan Univ, Dept Geog & Environm, IL-5290002 Ramat Gan, Israel; [Ziv, Baruch] Open Univ Israel, Dept Nat Sci, IL-4353701 Raanana, Israel; [Khain, Pavel] Israel Meteorol Serv, IL-5025001 Bet Dagan, Israel
推荐引用方式 GB/T 7714	Dayan, Uri,Lensky, Itamar M.,Ziv, Baruch,et al. Atmospheric conditions leading to an exceptional fatal flash flood in the Negev Desert, Israel[J]. Hebrew University of Jerusalem,2021,21(5):1583-1597.
APA	Dayan, Uri,Lensky, Itamar M.,Ziv, Baruch,&Khain, Pavel.(2021).Atmospheric conditions leading to an exceptional fatal flash flood in the Negev Desert, Israel.NATURAL HAZARDS AND EARTH SYSTEM SCIENCES,21(5),1583-1597.
MLA	Dayan, Uri,et al."Atmospheric conditions leading to an exceptional fatal flash flood in the Negev Desert, Israel".NATURAL HAZARDS AND EARTH SYSTEM SCIENCES 21.5(2021):1583-1597.