Presentación realizada en: Using ECMWF's Forecasts (UEF2017), celebrada del 12 al 16 de junio de 2017 en Reading (Inglaterra)

Calbet, Xavier

García Pereda, Javier

Martínez Rubio, Miguel Ángel

Moisselin, Jean-Marc

Rípodas Agudo, Pilar

English

Agencia Estatal de Meteorología

Nowcasting SAF products and applicationsPilar Rípodas (pripodasa@aemet.es)Xavier Calbet, Javier García-Pereda, Jean Marc Moisselin, M.A. Martínez1Using ECMWF’s Forecasts UEF2017Workshop: Satellite – based storm monitoring and observational input to NWP12-16 June 2017, ECMWF, Reading, UK 2• Introduction to EUMETSAT SAF Network• Introduction to Nowcasting SAF (NWC SAF)• NWC SAF products Monitoring storms As input to NWP models• ConclusionsOutlineEUMETSAT SAF Network3• EUMETSAT European Organization for the Exploitation ofMeteorological Satellites• Purpose: to supply weather and climate-related satellite data,images and products to the National Meteorological Servicesof its Member and Cooperating States in Europe, and otherusers worldwide.• EUMETSAT HQ in Darmstadt, Germany.• SAFs (Satellite Application Facilities):• located at Weather Services in EUMETSAT Member andCo-operating States• complement production of standard meteorologicalproducts at EUMETSAT central facilityEUMETSAT SAF Network4SAFs are specialized on topics and themes:• SAF on Climate Monitoring (CM SAF), cm-saf.eumetsat.int• SAF on Support to Operational Hydrology and Water Management (H SAF), h-saf.eumetsat.int• SAF on Land Surface Analysis  (LSA SAF), lsa-saf.eumetsat.int• SAF on Numerical Weather Prediction (NWP SAF), nwp-saf.eumetsat.int • SAF on Atmospheric Chemistry Monitoring  (AC SAF), ac-saf.eumetsat.int• Ocean and Sea Ice (OSI SAF), osi-saf.eumetsat.int• SAF on Radio Occultation Meteorology, rom-saf.eumetsat.int • SAF on support to Nowcasting (NWC SAF), nwc-saf.eumetsat.int NWCSAF concept: objectives5 The general objective of the NWC SAF is to provideoperational services to ensure the optimum use ofmeteorological satellite data in Nowcasting and Very ShortRange Forecasting by targeted users. To achieve this goal , the NWC SAF is responsible for thedevelopment and maintenance of appropriate SW Packages(GEO and POLAR Satellites), as well as of all related tasksfor user's support. The NWC SAF SW allows the user to generate satellitederived products with a direct application in Nowcasting6NWC SAF Software The user runs the SW package and generate the products Advantage: users can configure the SW to fit their needs (e.g. the user define the area where the products aregenerated) Potential problem: users need access to EUMETSAT satelliteimages and a NWP model outputThe software is distributed freely to registered users of themeteorological community and is used for Nowcasting and as adevelopment and research toolNWC SAF Consortium7Since March 2017!quality assessment andprototype products for MTG-LICloud and precipitationproducts for polar satellitesGEO extrapolation imagery productsautomatic recognition of meteorological phenomenaCloud products andconvection productsfor geostationarysatellitesLeading EntityHigh Resolution windsPrecipitation productsPrecipitable water andstability analysisproductNWCSAF Products: storms monitoring at different development stages8TimeAny timeCloud products (CMA, CT, CTTH, CMIC)High Resolution Winds (HRW)Pre-convective environmentiSHAI (imaging Satellite Humidity and Instability)Convection InitiationCI (convection initiation)Mature convective stormRDT-CW (Rapid Developing Thunderstorm)Precipitation productsPreconvective environmentiSHAI: imaging Satellite Humidity and Instability.9• Calculated at cloud free pixels• Stability indices (KI, LI, SHW) and Precipitable water (totalcolumn and at different layers)• Application: detection of pre-convective areas• Specially useful when NWP model does not capture theactual situation10Differences with the NWP model: Precipitable Water in Middle LayerML(850-500 hPa)12th August 2011 9:00 UTC 12th August 2011 18:00 UTC Precipitable Water in Middle LayerML(850-500 hPa)Aplication: identification of pre-convective areasMiguel A. Martínez, AEMETPrecipitable Water inMiddle LayerML(850-500 hPa)Differences on Precipitable Water in Middle LayerML(850-500 hPa) with NWPVertical cross sections of normalized q  at every level(top) ECMWF (bottom) iSHAIiSHAI 12th August 2011HRW. Example Pre-convective environment 19 August 201512HRW showing convergence in the region of interest at 4:00 am, while RDT shows cell at 5:15 am and Intense precipitation at 07:00 am4:00 am HRW Winds at different levels               (low levels in blue)Delivered as a demonstrational product in GEO v2016. A major improvement is expected in GEO v2018, due to new tuning, use of microphysics, improvement of tracking.Visualization asa field of probabilities: No convection initiationProbability of convection for pixels: 0-25%  25-50% 50-75%  >75%New GEO v2016 product Convection InitiationCI: Probability of a warm cloud to become a thunderstorm in thenear future (30 minutes).RDT-CW - Rapid Developing Thunderstorm, convective warningEach “Convection cell” identified with its specific characteristics:Mature stage. RDT-CWSome characteristics can be very useful forsome specific users. Aeronautical users.15Enhanced satellite 10.8µm imageObjects with at least 6°Cof vertical developmentConvective objectsRDT objects with selected attributesUPLINKRDT processCourtesy Honeywell / Atmosphere(xml file)19 February 2017. City of Málaga affected by highly localized and stationary thunderstorms 16CTTH shows Cloud tops up to 12Km, Echotops max 9 Km  17Convective Rainfall Rate. CRR and CRR-PhBoth products generate • Intensity of precipitation associated to convective systems• Precipitation accumulated in the last hourCRR: precipitation empirically derived from  VIS(0.6), IR (10.8) and [IR (10.8)-WV(6.2)] SEVIRI channels. Available day and nightCRR-Ph: precipitation derived from Cloud microphysical properties (CMIC ). Only available at day time. 1818 September 2016 15:00 UTC. Convection in the Canary Islands RegionCRRCRR-PhReflectivityEcho TopsConvective Rainfall Rate. CRR and CRR-Ph19• Indirect measurements of the precipitation• Radar data is more reliable than these satellite derived products• CRR  and CRR-Ph are very useful: In areas without radar coverage When a radar is down In areas that are “hidden” to the radarHRW product identifies a narrow band of hurricane winds between 850-1000 hPa,which fits very well with the affected area (mean winds in 15 min. of 125-150 km/h)These winds were not identified by the ECMWF model used for calculation of HRW,and so HRW proves it can provide additional elements useful for the forecasting.Explosive Cyclogenesis entering Portugal from the Atlantic Ocean in the night of 22-23 December 2009NWC SAF products: Other applications.Observational input to NWP21• Assimilation in NWP models. HRW product is assimilated in mesoscale model of the MetOffice since some years• NWC SAF could be used for verification of models (especially over areas with sparse observation network)• Cloud products• HRW• RDT product• Bogusing/analysis improvement (RDT)22CONCLUSIONS• NWC SAF products have proved to be useful for monitoring storms atdifferent development stages• We are preparing a short practical guide how to use the NWC SAF products(main applications and limitations)• User feedback on the use of the NWC SAF products is very welcome• The products are currently being tested in the ESSL Testbed• Products will be adapted to the new generation satellites (MTG, Himawari,GOES-R)• We will generate products for the new satellite missions (MTG-LI, MTG-IRS,EPS-SG B MW sensors)• NWC SAF can be used as input to NWP models23More information:• nwc-saf.eumetsat.int• safnwchd@aemet.es                                     • pripodasa@aemet.esThank you very much for your attention!

Nowcasting SAF products and applications

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Nowcasting SAF products and applications

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