Accomplishments, challenges and opportunities in developing network based radar systems for high-impact small-scale weather events

Author(s):  
V. Chandrasekar ◽  
Yanting Wang ◽  
Sanghun Lim ◽  
Francesc Junyent ◽  
Nitin Bharadwaj ◽  
...  
2015 ◽  
Vol 54 (9) ◽  
pp. 1837-1846 ◽  
Author(s):  
Steven Huryn ◽  
William Gough ◽  
Ken Butler ◽  
Tanzina Mohsin

AbstractHigh-impact weather events, such as thunderstorms and their associated hazards, are aspects of a changing climate that are likely to have an adverse effect on society. Southern Ontario is Canada’s most populated region as well as the region of Canada that receives the most thunderstorms. Before completing climatological studies of thunderstorms in southern Ontario, it is important to determine whether historical thunderstorm data are reliable. Archived thunderstorm data are available from eight 24-h-staffed weather stations across southern Ontario. The data may be subject to observer bias. This study compared the manual observations of thunderstorms with automated data from the Canadian Lightning Detection Network. It was found that the data that are based on the manual observations are reliable enough that any significant trends in thunderstorm occurrence over time should be apparent. Because of the small-scale nature of thunderstorms, however, the data may only be valid for small distances (up to 10 km) around each weather station. A diurnal bias was also discovered, with manual thunderstorm observations being slightly better at night.


2021 ◽  
Author(s):  
Karine Gagnon ◽  
Hartvig Christie ◽  
Karin Didderen ◽  
Camilla W. Fagerli ◽  
Laura L. Govers ◽  
...  

2020 ◽  
Vol 20 (5) ◽  
pp. 1513-1531 ◽  
Author(s):  
Oriol Rodríguez ◽  
Joan Bech ◽  
Juan de Dios Soriano ◽  
Delia Gutiérrez ◽  
Salvador Castán

Abstract. Post-event damage assessments are of paramount importance to document the effects of high-impact weather-related events such as floods or strong wind events. Moreover, evaluating the damage and characterizing its extent and intensity can be essential for further analysis such as completing a diagnostic meteorological case study. This paper presents a methodology to perform field surveys of damage caused by strong winds of convective origin (i.e. tornado, downburst and straight-line winds). It is based on previous studies and also on 136 field studies performed by the authors in Spain between 2004 and 2018. The methodology includes the collection of pictures and records of damage to human-made structures and on vegetation during the in situ visit to the affected area, as well as of available automatic weather station data, witness reports and images of the phenomenon, such as funnel cloud pictures, taken by casual observers. To synthesize the gathered data, three final deliverables are proposed: (i) a standardized text report of the analysed event, (ii) a table consisting of detailed geolocated information about each damage point and other relevant data and (iii) a map or a KML (Keyhole Markup Language) file containing the previous information ready for graphical display and further analysis. This methodology has been applied by the authors in the past, sometimes only a few hours after the event occurrence and, on many occasions, when the type of convective phenomenon was uncertain. In those uncertain cases, the information resulting from this methodology contributed effectively to discern the phenomenon type thanks to the damage pattern analysis, particularly if no witness reports were available. The application of methodologies such as the one presented here is necessary in order to build homogeneous and robust databases of severe weather cases and high-impact weather events.


2020 ◽  
pp. 251484862093471
Author(s):  
Laura Imburgia ◽  
Henny Osbahr ◽  
Sarah Cardey ◽  
Janet Momsen

Genuine inclusive participation in the self-governance of communal irrigation systems remains a challenge. This article analyses the mechanisms of participation in irrigation water users’ associations (WUAs) with focus on women as leaders of those organizations by drawing on cases from a comparative, multicase mixed-method study in Ethiopia and Argentina. After having being a topic for decades in gender and development debates, in many irrigated areas of the world, WUAs continue to be male dominated at all levels, especially in influential positions. Findings in this article suggest that despite large socio-economic and cultural differences, the current water management systems in both research locations reinforce problems of unequal gender participation; women have more obstacles and constraints in establishing equal access in membership, participation, and decision making in irrigation management. The lack of inclusive participation and the low representation of women in leadership roles lead to WUAs being poorly rooted in their community of users. Incomplete social rootedness of WUAs jeopardizes their effectiveness and equality in water management and, as a result, affects long-term sustainability. Through analysis of empirical data of communal small-scale irrigation systems in both countries, the article discusses who participates, how and why they participate, and the reasons for low numbers of women in leadership roles within the WUAs. Finally, the article reflects on possible enabling conditions that could foster inclusive participation, increase the quantity and capacity of women in management and leadership roles, and the benefits this may bring to sustainable irrigation systems.


2006 ◽  
Vol 16 (3) ◽  
pp. 167-180 ◽  
Author(s):  
Kate M. Thomas ◽  
Dominique F. Charron ◽  
David Waltner-Toews ◽  
Corinne Schuster ◽  
Abdel R. Maarouf ◽  
...  

2020 ◽  
Vol 17 (2) ◽  
pp. 213-226 ◽  
Author(s):  
H Rahman ◽  
FA Happy ◽  
AH Efan ◽  
MHR Hera

This study examined the prevailing dairy value chain based on primary data collected from 70 small-scale milk producers of Mymensingh district of Bangladesh. The total cost and net return per month per cow were Tk. 4024.30 and Tk. 3165.70, respectively. The net value additions of Tk. 2091.42, Tk. 495.00, Tk. 655.00, Tk. 503.25, Tk. 309.70 were estimated for milk producers, collectors, Faria, Bepari and retailers respectively. Different actors spent highest marketing cost ranged from Tk.49 to Tk.80 for transportation compared to other marketing functions. Actors mostly dependent on the on-going market prices for setting price of milk in the value chain. A value chain map was developed showing the relationships and linkages among value chain actors of small-scale dairy. The study identified some critical factors for successful dairy marketing. The factors were understanding consumer behaviour, technology and transportation, improved business relationships, reduced transaction costs, and improved information flow, and organized market structure. Milk producer’s share in consumers’ price was highest for channel- I followed by channel- V. Expensive, inadequate, low quality feed, lack of grazing land, green grass, inadequate capital, knowledge about cost of production, weak extension services, high fees and unavailability of veterinary doctors, were some of the major problems of milk producers. Supply of adequate feed at subsidized price, ensuring easy access to institutional credit at a lower interest rate, adequate medicine and veterinary services, allocation of khas land for producing fodder/grass, were suggested to solve the problems. SAARC J. Agri., 17(2): 213-226 (2019)


2015 ◽  
Vol 15 (21) ◽  
pp. 12361-12384 ◽  
Author(s):  
C. Barthlott ◽  
C. Hoose

Abstract. This paper assesses the resolution dependance of clouds and precipitation over Germany by numerical simulations with the COnsortium for Small-scale MOdeling (COSMO) model. Six intensive observation periods of the HOPE (HD(CP)2 Observational Prototype Experiment) measurement campaign conducted in spring 2013 and 1 summer day of the same year are simulated. By means of a series of grid-refinement resolution tests (horizontal grid spacing 2.8, 1 km, 500, and 250 m), the applicability of the COSMO model to represent real weather events in the gray zone, i.e., the scale ranging between the mesoscale limit (no turbulence resolved) and the large-eddy simulation limit (energy-containing turbulence resolved), is tested. To the authors' knowledge, this paper presents the first non-idealized COSMO simulations in the peer-reviewed literature at the 250–500 m scale. It is found that the kinetic energy spectra derived from model output show the expected −5/3 slope, as well as a dependency on model resolution, and that the effective resolution lies between 6 and 7 times the nominal resolution. Although the representation of a number of processes is enhanced with resolution (e.g., boundary-layer thermals, low-level convergence zones, gravity waves), their influence on the temporal evolution of precipitation is rather weak. However, rain intensities vary with resolution, leading to differences in the total rain amount of up to +48 %. Furthermore, the location of rain is similar for the springtime cases with moderate and strong synoptic forcing, whereas significant differences are obtained for the summertime case with air mass convection. Domain-averaged liquid water paths and cloud condensate profiles are used to analyze the temporal and spatial variability of the simulated clouds. Finally, probability density functions of convection-related parameters are analyzed to investigate their dependance on model resolution and their impact on cloud formation and subsequent precipitation.


Sign in / Sign up

Export Citation Format

Share Document