Radar analysis of cloud systems and their rainfall yield in Israel

Goldreich, Yair; Mozes, Hanan; Rosenfeld, Daniel

doi:10.1560/g68k-30mn-d5v0-kuhu

Cited by 43 publications

(43 citation statements)

References 9 publications

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“…We have found that 45 Cyprus low days contribute 83% of the seasonal rainfall (averaged over the study region), which is 75% of the annual total. These results are lower than the 90% contribution of Cyprus lows denoted by Goldreich et al (2004) for the entire rainy season. Seventeen Cyprus low days that occur in the transition months (April, May, September and October) contribute only <10% of the annual rainfall.…”

Section: Discussioncontrasting

confidence: 62%

“…Such a seasonal course was not found. We, therefore, suggest that the sea-land temperature difference (discussed by Goldreich et al, 2004 and simulated by Khain et al, 1993Khain et al, , 1996 is the major factor responsible for this intra-annual rainfall course.…”

Section: Discussionmentioning

confidence: 75%

“…The synoptic systems prevailing over the EM, and their associated weather conditions, are extensively reviewed in HMSO (1962), Ziv and Yair (1994) and Goldreich (2003). The main contributor to the rainfall in Israel, imparting 90% of the annual amount, is the Cyprus low (Goldreich, 2003, Goldreich et al, 2004. Cyprus lows are mid-latitude disturbances that tend to develop in this cyclogenetic area when upper troughs or cut-off lows penetrate the EM (Zangvil et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

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Links between the rainfall regime in Israel and location and intensity of Cyprus lows

Saaroni

Halfon

Ziv

et al. 2009

Intl Journal of Climatology

125

144

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ABSTRACT:The interannual variations and the spatial distribution of rainfall in the Mediterranean and semi-arid regions of Israel are analysed with respect to variations in the occurrence of the typical synoptic systems of the Eastern Mediterranean. The synoptic analysis is based on a daily, semi-objective synoptic classification (Alpert et al., 2004a). The study covers the months November-March, in which 90% of the annual rainfall is obtained, mostly resulting from Cyprus lows. The interannual variations of the rainfall are well explained by the synoptic types, and the occurrences of Cyprus lows are highly correlated with the rainfall. It was found that the daily and seasonal rainfall are highly dependent on the depth of the cyclone. Moreover, deep lows are more effective for the mountainous regions, due both to the enhanced orographic effect and to the fact that stronger winds, associated with deep lows, are more efficient in transporting rain-producing clouds from the Mediterranean Sea inland. The location of the cyclone determines the spatial distribution of the rain it produces over Israel. The cyclones located east of Cyprus were found productive mainly for the southern parts of the study region, while those located to the west and north of Israel were found productive for the north of the country. The high sensitivity of the rainfall to the location of the surface cyclones emphasizes the major role that lower level moisture transport plays in rain formation.

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Section: Discussioncontrasting

confidence: 62%

Section: Discussionmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

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Links between the rainfall regime in Israel and location and intensity of Cyprus lows

Saaroni

Halfon

Ziv

et al. 2009

Intl Journal of Climatology

125

144

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“…In the north (Galilee plain), 40% of the precipitation originates from stationary and cold fronts, compared to 19% in the central plains. On the other hand, Benard cells and coastal fronts contribute only 19% in the north compared to 41% in the center [22].…”

Section: Discussionmentioning

confidence: 95%

The Advantage of Using International Multimodel Ensemble for Seasonal Precipitation Forecast over Israel

Givati

Housh

Levi

et al. 2017

Advances in Meteorology

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This study analyzes the results of monthly and seasonal precipitation forecasting from seven different global climate forecast models for major basins in Israel within October-April 1982. The six National Multimodel Ensemble (NMME) models and the ECMWF seasonal model were used to calculate an International Multimodel Ensemble (IMME). The study presents the performance of both monthly and seasonal predictions of precipitation accumulated over three months, with respect to different lead times for the ensemble mean values, one per individual model. Additionally, we analyzed the performance of different combinations of models. We present verification of seasonal forecasting using real forecasts, focusing on a small domain characterized by complex terrain, high annual precipitation variability, and a sharp precipitation gradient from west to east as well as from south to north. The results in this study show that, in general, the monthly analysis does not provide very accurate results, even when using the IMME for one-month lead time. We found that the IMME outperformed any single model prediction. Our analysis indicates that the optimal combinations with the high correlation values contain at least three models. Moreover, prediction with larger number of models in the ensemble produces more robust predictions. The results obtained in this study highlight the advantages of using an ensemble of global models over single models for small domain.

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“…During the winter (January-March) CL systems commonly, have a deep upper level trough and intense vortices [27,28]. During the autumn to winter transition season (November-December) most of the events have shallow upper level trough and weak shallow vortices.…”

Section: Rainfall Over North Israelmentioning

confidence: 99%

The Use of an Orographic Precipitation Model to Assess the Precipitation Spatial Distribution in Lake Kinneret Watershed

Shamir

Rimmer

Georgakakos

2016

Water

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Abstract:A high-resolution 3-D orographic precipitation model (OPM) forced by Climate Forecast System (CFS) reanalysis fields was developed for the Lake Kinneret watershed (Israel-Syria-Lebanon territories). The OPM was tuned to represent the interaction between the advected and stratiform rainfall, and the local orographic enhancement. The OPM evaluation was focused on the densely instrumented lower part of the watershed. To evaluate the ungauged upper-elevation, bias-adjusted precipitation estimates from the Global-Hydro-Estimator were used. The OPM simulates higher rainfall amounts in the upper-elevation watershed compared to currently used rainfall estimates from an elevation dependent regression. The larger differences are during rain events with southwesterly wind flow and high moisture flux. These conditions, according to the OPM, are conducive to enhanced orographic lifting in the Hermon Mountain. A sensitivity analysis indicated that the higher wind speeds for southwesterly-northwesterly trajectories generate significant orographic lifting and increase the precipitation differences between the lower and upper elevations.

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Radar analysis of cloud systems and their rainfall yield in Israel

Cited by 43 publications

References 9 publications

Links between the rainfall regime in Israel and location and intensity of Cyprus lows

Links between the rainfall regime in Israel and location and intensity of Cyprus lows

The Advantage of Using International Multimodel Ensemble for Seasonal Precipitation Forecast over Israel

The Use of an Orographic Precipitation Model to Assess the Precipitation Spatial Distribution in Lake Kinneret Watershed

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