http://convection.satreponline.org/dokuwiki/ 2010-09-08T07:17:11-04:00 http://convection.satreponline.org/dokuwiki/ http://convection.satreponline.org/dokuwiki/lib/images/favicon.ico text/html 2009-09-24T02:36:59-04:00 http://convection.satreponline.org/dokuwiki/doku.php?id=16_january_2008_-_severe_storms_above_eastern_parts_of_south_africa_swaziland_and_mozambique_close_to_maputo&rev=1253774219&do=diff Authors: * Martin Setvak Below you see an example of how the storm top appearance changes depending on the color enhancement. In this case the animaton shows just a shift of the color scale from our (CHMI) “European standard scale” (200-240K) down to lower temperatures, by 20K (at 1K steps). At the same time it illustrates how one scale tuned for some region (in this case for Central Europe) needs to be modified for a different region (depending of the tropopause height and/or temperature).… text/html 2010-06-21T06:24:46-04:00 http://convection.satreponline.org/dokuwiki/doku.php?id=17_june_2010_-_severe_convection_with_hail_in_slovenia&rev=1277115886&do=diff the 2010 hail season is already “hot”. Above you can see some nice hailstones which a colleague of mine (Furio Pieri) have found on the <http://24ur.com/> website, where they said that it was due to the Slovenian hailstorm of yesterday afternoon. I hope that Mateja can confirm that these local obs are true. I attach also some MSG_RGB pictures, from which T-Ref diagram (at least before 14:30UTC ) I was not expecting so severe hail. text/html 2010-08-07T10:59:57-04:00 http://convection.satreponline.org/dokuwiki/doku.php?id=18_july_2010_-_severe_convection_in_ne_italy&rev=1281193197&do=diff Another interesting July 2010 case. Maybe the more severe storms were in Austria, but we have local data only for FVG (NE Italy). EUMETSAT 10.8um IR MSG movie plus CESI/SIRF lightning C2G every 30'. OSMER VMI radar movie plus OSMER 5' stations and CESI/SIRF lightning C2G every 10'. text/html 2009-09-24T02:37:46-04:00 http://convection.satreponline.org/dokuwiki/doku.php?id=20_may_2008_-_severe_convection_hungary&rev=1253774266&do=diff Authors: * Mária Putsay * Kornél Kolláth * Jochen Kerkman * Jarno Schipper Fortunately well forecasted (highest alarm for Hungary on MeteoAlarm) on 20th May 2008, rapid development of severe convective storms were observed over Hungary. On the ground these storms where associated with torrential rainfall, flash floods, hail and even tornados. The enhanced Meteosat 9 images show very the devlopment of nice ring storms! The explosive growth and the severe updrafts are also nicely reflec… text/html 2009-09-24T02:39:04-04:00 http://convection.satreponline.org/dokuwiki/doku.php?id=21_june_2007_-_severe_convection_czech_republic_and_austria&rev=1253774344&do=diff Author * Jarno Schipper ---------- A case of severe convection took place on 21 June 2007 over Central Europe. In the IR10.8 loop presented below the developments over the day can already well be observed. Interesting is that two series of convective development are taken place over Austria and the Czech Republic. text/html 2009-09-24T02:37:29-04:00 http://convection.satreponline.org/dokuwiki/doku.php?id=22_april_2008_-_severe_convection_bulgaria_and_romania&rev=1253774249&do=diff Authors: * Martin Setvak * Aurora Stan-Sion * HansPeter Roesli * Gergana Kozinarova * Jarno Schipper ---------- On the afternoon of 22nd April 2008, a series of significant and severe convective storms has developed in the region of Bulgaria, Romania and south-west Ukraine. Two of these storms have developed several significant cloud-top features, observed by weather satellites, commonly ranked as indicators of possible storm severity. These were: high 3.7/3.9 μm cloud top reflectiv… text/html 2010-09-08T06:47:00-04:00 http://convection.satreponline.org/dokuwiki/doku.php?id=23_july_2010_-_supercell_passing_in_fvg_ne_italy_-_data_and_pictures&rev=1283942820&do=diff Hi again, the July 2010 storm season was really brilliant. The last case I'll propose is a supercell (see pictures below) producing a lot of damages around the Lauzacco village (between Udine and Palmanova, near Pavia di Udine). EumetSat MSG 10.8um movie plus CESI/SIRF C2G lightning data and radiosoundings obs at 500hPa every 30'. text/html 2010-06-02T06:07:06-04:00 http://convection.satreponline.org/dokuwiki/doku.php?id=25_may_2009_-_first_severe_convection_in_europe_of_the_season_-_the_showcase&rev=1275473226&do=diff Authors: * Jarno Schipper The first major outbreak of thunderstorms in Central Europe in 2009 occurred on the 25th of May. During this day large parts of western and central Europe (France, Belgium, The Netherlands, Luxembourg, Germany, Switzerland, Northern Italy, Austria, the Czech Republic, Hungary, Slovenia and North-Western Poland) were affected by some very severe convective events (isolated multicells, supercells, and mesoscale convective systems). All participants of the CWG having … text/html 2010-07-05T05:54:11-04:00 http://convection.satreponline.org/dokuwiki/doku.php?id=4_july_2010_-_severe_convection_with_hail_in_ne_italy&rev=1278323651&do=diff Hi, yesterday we had a very nice storm, which produced a lot of damages around Pordenone, because of hail and strong wind. The storm then moved to the Veneto region producing a lot of damages to the Heineken Jammin Festival near Venezia. I put some satellite data, but other could hopefully add other images with better resolution. Of course I add also local radar VMI and the sounding analysis :-D text/html 2010-07-08T03:17:27-04:00 http://convection.satreponline.org/dokuwiki/doku.php?id=6_july_2010_-_severe_convection_in_ne_italy&rev=1278573447&do=diff Hi again, we had another nice stormy day yesterday, with a cell producing 12mm of rain in 5' in the city of Udine and a gust of 30 m/s recorded in the city of Trieste. Another big MCS followed from the Veneto region toward South, but I don't have the local data. Enjoy! Tino text/html 2009-09-24T02:39:23-04:00 http://convection.satreponline.org/dokuwiki/doku.php?id=7_july_2009_-_severe_convection_italy_slovenia_and_austria&rev=1253774363&do=diff Authors: * Agostino Manzato * Jarno Schipper Since 25th June central EUrope is plagued by severe thunderstorms. With already saturated soils from a previous rainevent during the third week of June, these extra thunderstorms are considered dangerous and cause flash floods. In this small case some images and loops of a larger cell which developed in Nortnern Italy and moved over the NE part of the country with associated thunderstorms moved in Slovenia. text/html 2010-01-05T09:39:19-04:00 http://convection.satreponline.org/dokuwiki/doku.php?id=about&rev=1262702359&do=diff The enhanced possibilities of the EUMETSAT Meteosat Second generation (MSG) satellite have triggered a number of new applications and products in the support of nowcasting convective storms. The Convection Working Group, consisting of scientists from more than 40 countries, has the aim to make a full inventory and evaluation of the existing convection nowcasting products in order to arrive at a “best practices” guideline for future use. Common test cases are processed and interpreted to support… text/html 2009-11-12T07:35:20-04:00 http://convection.satreponline.org/dokuwiki/doku.php?id=actions_and_recommendation_of_the_meeting&rev=1258029320&do=diff Landshut, 8 to 10 October 2009 Actions Action 1 - All CWG members: Find out about national availability of radar data and report back to CWG before the next CWG meeting in Spain 2010. Action 2 - All CWG members: Find out about national availability of lightning data and report back to CWG before the next CWG meeting in Spain 2010. text/html 2009-10-27T03:52:44-04:00 http://convection.satreponline.org/dokuwiki/doku.php?id=best_practises&rev=1256629964&do=diff 1. Introduction: IMWM Meeting Overview by John Mecikalski 1.1 Scope of the workshop After the first 5 years of MSG operations, a number of applications in the area of severe convective storm detection and nowcasting have been developed by various users. The focus of the IMWC Convective Workshop was to have a comprehensive inventory of the available applications in the field of convective weather nowcasting, with the aim to get deeper insight into the differences and commonalities of the ava… text/html 2009-10-14T05:31:03-04:00 http://convection.satreponline.org/dokuwiki/doku.php?id=case_studies&rev=1255512663&do=diff The documentation is categorised in various categories: Preconvective Conditions, Convective Inititiaton and Mature Phase. A final category deals not so much with the various stages of convection but provides information on tools and visualisation techniques for the monitoring and nowcasting of convection. text/html 2009-10-14T06:29:09-04:00 http://convection.satreponline.org/dokuwiki/doku.php?id=convective_initiation_ci&rev=1255516149&do=diff * JOHN R. MECIKALSKI - Atmospheric Science Department, University of Alabama in Huntsville, Huntsville, Alabama * KRISTOPHER M. BEDKA - Cooperative Institute for Meteorological Satellite Studies, Space Science and Engineering Center, University of Wisconsin—Madison, Madison, Wisconsin text/html 2010-04-06T07:02:26-04:00 http://convection.satreponline.org/dokuwiki/doku.php?id=documentation&rev=1270551746&do=diff A ”best practises” document was written by John Mecikalski as outcome of the CWG meeting in Krakow, Poland in November 2007 with future directions of nowcasting convection at EUMETSAT. All are invited to read through and append their information/thoughts to this document as well. text/html 2009-10-10T02:53:10-04:00 http://convection.satreponline.org/dokuwiki/doku.php?id=flash_floods_in_landshut&rev=1255157590&do=diff So, again flash floods in Isar basin. They forgot to open the smaller Isar. text/html 2009-10-14T06:19:56-04:00 http://convection.satreponline.org/dokuwiki/doku.php?id=ir_cold_cloud_tops&rev=1255515596&do=diff IR Cold Cloud Tops IR Cold Cloud Tops product was already recommended during the workshop by Martin Setvak as being useful during summer convection season for the meteorologists and also for case studies of convective events. This product is generated from calibrated radiative temperatures of Meteosat 9 IR10.8 using the color scheme from blue to turqois to yellow and red applied over the fixed interval 200 to 240 K. text/html 2010-01-11T10:04:33-04:00 http://convection.satreponline.org/dokuwiki/doku.php?id=minutes_of_the_meeting&rev=1263222273&do=diff Landshut, Germany 8-10 October 2009 ---------- Participants: Volker Gärtner (Chair) Nikolai Dotzek (Chair) Jarno Schipper (Secretary) Daniel Rosenfeld Davide Melfi Agostino Manzato Christo Georgiev Monika Pajek Natasa Strelec Piotr Struzik text/html 2010-05-01T02:46:42-04:00 http://convection.satreponline.org/dokuwiki/doku.php?id=nowcast_system&rev=1272696402&do=diff Above one sees the chart describing elements of an end-to-end convection nowcast system. This graphs was also shown during the Landshut meeting by Kristopher Bedka (NASA). There is certainly more that can be added to this, we really invite you to add your comments to this! text/html 2010-06-02T07:07:12-04:00 http://convection.satreponline.org/dokuwiki/doku.php?id=nwcsaf_crr_25_05_2009&rev=1275476832&do=diff NWCSAF Convective Rainfall Rate product This was one of the first strong convective episodes occurred during 2009 over Spain. The most severe events over Spain occurred the previous day, 24th May. 9619 lightning took place along the whole day. A loop with Radar (PPI product) instantaneous rain rates depicts what happened on 24th May over Spain: text/html 2009-10-14T06:11:58-04:00 http://convection.satreponline.org/dokuwiki/doku.php?id=overshooting_tops&rev=1255515118&do=diff Objective Day/Night Overshooting Top and Enhanced-V Detections Using MODIS, AVHRR, and MSG SEVIRI Imagery in Preparation for GOES-R ABI Kristopher Bedka1, Jason Brunner2, Wayne Feltz2, and Richard Dworak2 * 1 Science Systems and Applications Inc., Hampton, VA USA text/html 2009-10-28T02:16:00-04:00 http://convection.satreponline.org/dokuwiki/doku.php?id=parallax_corrections&rev=1256710560&do=diff Description of the Parallax Correction Tables Tables exist for all MSG satellite positions, i.e. for 0 deg, for 3.4 deg W and for 9.5 deg E. The files need to be unzipped (use gunzip on Linux or Winzip on Windows) before they can be accessed. Each table is an ASCII file, where each line within the file contains the following numbers text/html 2009-10-14T06:17:51-04:00 http://convection.satreponline.org/dokuwiki/doku.php?id=sandwich_product&rev=1255515471&do=diff “Sandwich” product – blending the HRV and IR10.8 BT imagery Martin Setvák (CHMI), Lukáš Ronge (Amateur Stormchasing Society of the Czech Republic), Ján Kaňák (SHMI) The overshooting tops usually resemble “bubbles” of several image pixels across, seen either in visible and near infrared spectral bands due to their texture and shadows they cast, or in thermal bands as local brightness temperature minima, with steep gradients surrounding them. Under favorable conditions the overshooting tops are … text/html 2010-02-23T07:26:42-04:00 http://convection.satreponline.org/dokuwiki/doku.php?id=satcast_case_study&rev=1266928002&do=diff * Bernhard Reinhardt, Nikolai Dotzek We show examples of the SATCAST Convective Initiation (CI) algorithm in a version adapted to exploit additional MSG-SEVIRI-channels. The SATCAST-algorithm is designed to detect initial cumulus clouds which are likely to eventually produce radar echoes greater 35 dBZ. To achieve this, 17 'interest fields' are evaluated. They distinguish three features representing physical properties of the growing clouds: Cloud depth, updraft strength and cloud top glaci… text/html 2009-10-10T02:56:06-04:00 http://convection.satreponline.org/dokuwiki/doku.php?id=start&rev=1255157766&do=diff * 21 June 2007 - Severe Convection Czech Republic and Austria A case of severe convection took place on 21 June 2007 over Central Europe. The satellite images show the severe developments over the day when especially large MCSs associated to hail where found over Czech Republic. text/html 2009-10-30T04:12:08-04:00 http://convection.satreponline.org/dokuwiki/doku.php?id=terms_of_reference_of_the_cwg&rev=1256890328&do=diff Purpose Gathering experts in the field of satellite meteorology for progression of using satellite data for detection, analysis and prediction of deep moist convection and associated phenomena. Activities * Coordination of development and enhancement of techniques for early detection and prediction of convective storms. text/html 2010-01-04T03:04:29-04:00 http://convection.satreponline.org/dokuwiki/doku.php?id=this_article&rev=1262592269&do=diff IR brightness temperature color enhancement, recommended for tops of deep convective clouds by Martin Setvak (CHMI) and Daniel Lindsey (NOAA/CIRA) The enhancement of grey or color scales, used for visualization of thermal IR-window imagery, has been utilized since the early days of weather satellites. The purpose of this technique is obvious - to provide a human eye more details in a specific range of temperatures, details which otherwise would remain hidden. The example below shows a color e… text/html 2010-08-04T05:31:05-04:00 http://convection.satreponline.org/dokuwiki/doku.php?id=wiki&rev=1280914265&do=diff * 21 June 2007 - Severe Convection Czech Republic and Austria A case of severe convection took place on 21 June 2007 over Central Europe. The satellite images show the severe developments over the day when especially large MCSs associated to hail where found over Czech Republic.