Weather
The purpose of this training module is to give an overview on the different RGB types created from the AVHRR instrument.
This training module describes MetOp AVHRR (Advanced Very High Resolution Radiometer) RGB schemes that are based on EUMETSAT recommendations. The 'recipes' were tuned to create high quality MetOp/AVHRR RGB images as similar as possible to the SEVIRI RGB schemes recommended by EUMETSAT.
The main aim of the training module is to help the users (weather forecasters and/or other experts) understand and use these RGB types by giving them background information, examples and exercises.
The module takes the following structure:
- The aim of the RGB type
- Physical background
- How to create the given RGB type
- Typical colors
- Examples of interpretation
- Benefits and limitations
- Comparisons with other RGB types and/or single channel images
- Exercise
In this Training Module, the two major mid-latitude cyclone models, the Norwegian cyclone model and the Shapiro-Keyser cyclone model will be explained in detail.
In this module, the two major mid-latitude cyclone models, the Norwegian cyclone model and the Shapiro-Keyser cyclone model, will be explained in detail. The intention of the module is to point out the main differences in the life cycles of cyclones of the Norwegian type and the Shapiro-Keyser (S-K) type. Special focus will be placed on the synoptic preconditions that lead to the formation of cyclones.
Finally, sting jets, which often appear in the context of Shapiro-Keyser cyclones, will be briefly introduced.
In this Training Module you can follow the voyage of the research vessel Polarstern across the Atlantic and observe various atmospheric phenomena.
Follow the voyages of the research vessel Polarstern through different climate zones and weather situations in three oceans - Arctic, Atlantic and Antarctic. Learn more about fog, winds and convection, the globel circulation and climate zones. See how satellite images help you observe the atmospheric phenomena.
In this Training Module you will learn more about the genesis and the development of cyclones at the downwind side of the Alps.
This training module treats the developement of cyclones at the downwind side of a mountain range with a special focus on the Alps. The module deals with the physical facts that lead to the creation of a lee cyclone, from its very beginning as a low-level vortex in the vicinity of a mountain range until its final stage as a mesoscale cyclone. The module tries to give an answer, why some of the lee vortices never develop into a full-grown cyclone and instead remain a local wind phenomenon or at best a low-level vortex that soon dissipates when leaving the downwind area by looking at the triggers that form cyclones. Local winds like the Bora and the Mistral are often linked to Lee Cyclogenesis in the Gulf of Genua. They will be treated at the end of the module.
Anna Cinzia Marra presents applications of the H-SAF precipitation products.
Length: 29 minutes.
The Mediterranean region is often impacted by heavy precipitation events, that are responsible for damages and sometimes casualties, especially over the coastal areas. Because of its peculiar geographical characteristics, conventional ground-based instruments, such as raingauge and radar networks, cannot be fully exploited for the monitoring, characterization and forecasting of severe events, in particular during their offshore development. For these reasons in the last decades satellite observations, both over geostationary and Leo platforms, have been recognized as a powerful tool to overcome the limitations of ground-based observations
In this presentation we analyze severe events that have recently affected the Mediterranean area, causing damages at the ground, and have challenged observational and forecasting capabilities. Heavy precipitation systems are described and analyzed here by exploiting active and passive microwave measurements and state-of-the-art precipitation products available in the HSAF project during the Global Precipitation Measurement (GPM) mission era. We highlight how the HSAF satellite products specifically developed for the European area, and thus tailored for the Mediterranean region, show better performances than algorithms designed for global application. We also show few strategies to blend satellite data and products with conventional meteorological data, with the aim to increase the knowledge of severe systems in the Mediterranean area and to support operational forecasting activities in a climate change perspective.
Davide Melfi presents the H-SAF precipitation products.
Length: 24 minutes.
The EUMETSAT Satellite Application Facility in Support to Operational Hydrology and Water Management (HSAF) generates and archives high quality products for operational hydrological applications. HSAF focuses on geophysical products of precipitation, soil moisture and snow parameters and the exploitation of these datasets to mitigate hazards and natural disasters such as flash floods, forest fires and landslides, and to monitor drought conditions, improving water resources management.
HSAF promotes the systematic and periodic products review with the continuous refinement of algorithms, validating results during calibration campaign, implementing operational driven procedures and services monitoring accordingly user requirement.
The current status of the Precipitation Cluster and the challenges for the future, looking at MTG and EPS-SG in particular, are presented.
Jana Campa investigates the development and the impact of a convective situation on 8 June 2018.
Length: 42 minutes.
In early summer 2018 Central Europe was affected by several severe thunderstorms, many producing large hail. One of the most severe storms struck the town of Črnomelj, Slovenia. Interestingly, this storm did not look more severe in the remote sensing data than other storms on the same day. The presentation will investigate its development and impact. In addition, the preconvective environment of this and other severe storms of the last summer will be investigated with the help of satellite sounding data.
The presenters show the effects of soil moisture on future convective developments for the eastern parts of Austria.
Length: 30 minutes.
Soil moisture is supposed to be a key parameter in triggering convection as it influences the lower boundary conditions of the atmosphere and the partitioning of energy between sensible and latent heat fluxes. Using the convection-permitting numerical weather prediction model AROME, we try to quantify this impact by investigating sensitivity studies, hence estimating the potential of satellite-based soil moisture measurements to improve the forecast of convective events.
Maria Putsay analyses different convective cells with Radar and lightning data.
Length: 50 minutes.
Detailed analyses of various types of storms using remote sensing (satellite, radar, lightning), in-situ and NWP data will be presented. Five cases for thunderstorms occurring in the Carpathian Basin were studied. We tracked the storms, to analyse the storms' temporal and spatial evolution and to see the possible relationships between lightning characteristics and severe convection development.
One frequent feature of supercell storms was that stronger lightning activity occurred in periods of mesocyclone intensification. This was probably also related to higher speed of updraft (or higher vertical acceleration) in these cases. Also in multicellular storms could be shown that the storm dynamics has major influence on the lightning activity (the number of lightning increased when signatures of strong convergence appeared in the Doppler radar velocity, though the radar reflectivity was not very high in that period).
Moist and conditionally unstable environments generally support development of severe storm with high electrification. However, some cases show that the storm’s dynamics and microphysics (e.g. distribution and type of the ice particle growth) can lead to large variability. For example, we found a case with tornadic thunderstorm, which exhibited much less lightning activity compared to other severe storms, despite of favourable environmental conditions concerning moisture or instability
José Lahuerta presents the NWCSAF products Convective Rainfall Rate (CRR) and CRR from cloud physical properties.
Length: 27 minutes.
The Convective Rainfall Rate (CRR) and the Convective Rainfall Rate from Cloud Physical Properties (CRR-Ph) products are satellite derived rainfall products based on the MSG/SEVIRI channels and cloud top microphysical properties respectively. Both rainfall products have been developed within the NWC SAF context to provide with instantaneous rain rates and hourly accumulations associated to convective episodes. Last version of the NWCSAF software package includes a new version of the CRR-Ph for nigh time. CRR and CRR-Ph behaviour will be texted in different convective events.
Jean-Marc Moisselin presents the most recent developments of the NWCSAF convection products.
Length: 30 minutes.
Météo-France develops and contiuously upgrades CI (Convection Initiation) and RDT (Rapidly Developing Thunderstorm) products. Both have been developed in the framework of NWCSAF.
CI is a pixel-based product that provides the probability for a pixel to develop in thunderstorm. The last delivery, v2018, has reached the "pre-operational" status in Eumetsat sense thanks to new developments (e.g. use of microphysics), tuning and validation effort. RDT is an object-based product that aims to detect, track, characterize and forecast the convective cells. Version v2018, includes new features like lightning jumps detection and is highly flexible and configurable. Status is "operational". RDT is very useful for aviation end users.
Hervé le Gléau focuses on cloud top height and micro-physics that can be retrieved from the NWCSAF/GEO software.
Length: 25 minutes.
This talk focuses the cloud top height and microphysics that can be retrieved from the NWCSAF/GEO software. The algorithms will be outlined, the improvements implemented in the last version (v2018 just released this year) will be highlighted and some validation results will be shown. After having given some perspective for MTG-day1 release, a convective situation over France will be illustrated.