Blended Course on the Principles of Satellite Meteorology 21 st April – 15 th July 2009 Classroom June 2009 Final Presentation – Convection – 09May2009 Ângela Lourenço – Portugal June20091Ângela Lourenço

Blended Course on the Principles of Satellite Meteorology Convective cell over central part of Portugal June20092Ângela Lourenço

Blended Course on the Principles of Satellite Meteorology 1.Synoptic Situation & Relevant Conceptual Model 2.Satellite Images 3.Observations June20093Ângela Lourenço

Blended Course on the Principles of Satellite Meteorology Synoptic Situation – Analysis UTC Mean sea level pressure and 10m horizontal wind 500hPa height, temperature and wind 300hPa height, temperature and wind Continental Portugal was under the influence of a weak ridge and a low west of Morocco and at middle and high levels by the upper branch of a trough. June20094Ângela Lourenço

Blended Course on the Principles of Satellite Meteorology Satrep Online – UTC (run UTC) Thickness_850/500 Conv1000 θe_850 Showalter Ridge in equivalent thickness between the two pressure level (mainly over Spain). Convergence at 1000hPa west of Morocco. High values of equivalent potential temperature. Unstable region southeast of Portugal. June20095Ângela Lourenço

Blended Course on the Principles of Satellite Meteorology Synoptic Situation – Analysis UTC Mean sea level pressure and 10m horizontal wind 500hPa height, temperature and wind 300hPa height, temperature and wind The high pressure system drifted towards France while the low moved northwards and slightly deepened. The trough at high levels was almost stationary although at 300hPa there was a local minimum just southwest of Continental Portugal. June20096Ângela Lourenço

Blended Course on the Principles of Satellite Meteorology Satrep Online – UTC (run UTC) Thickness_850/500 Conv1000 θe_850 Showalter The area of convergence at 1000hPa moves further north. Unstable region is bigger. Showalter index is lower than zero over south of Portugal. Ridge in equivalent thickness between the two pressure levels. High values of equivalent potential temperature. June20097Ângela Lourenço

Blended Course on the Principles of Satellite Meteorology SatRep Online – 1800UTC (run UTC Conv1000 Thickness_850/500 Showalter θe_850 The area of convergence at 1000hPa has not change considerably. Unstable region is more define. Showalter index is lower than zero over Portugal (very unstable over Spain). Ridge in equivalent thickness between the two pressure levels. High values of equivalent potential temperature. June20098Ângela Lourenço

Blended Course on the Principles of Satellite Meteorology 0600UTC1200UTC 1800UTC 1200UTC1800UTC Global Instability Index (LI) mm Total Precipitable Water June20099Ângela Lourenço

Blended Course on the Principles of Satellite Meteorology June200910Ângela Lourenço Conceptual Model: Cb Cluster Key Parameters: a)Thickness ridge b)Thetaw850 ridge c)Unstable (Showalter Index) d)Low level divergence Cb Cluster developed in warm air of a thermal ridge. It started to organize over sea, southwest of Lisbon around 10-12UTC then it moved slowly northeastward, had its mature stage between 16 and 17UTC, then its movement drifted north and decayed later in the evening. 09may2009 – 1800UTC

Blended Course on the Principles of Satellite Meteorology 1600UTC Lisbon High Resolution Visible (HRV – Channel 12) At this time is possible to detect an overshooting. Severe Convection RGB (WV6.2-WV7.3, IR3.9- IR10-8, NIR1.6-VIS0.6). High level cloud with ice particles where some yellowish pixels can indicate cell’s development and the presence of small ice particles but large ice particles (red and orange) are dominant and there are not bright yellow spots. Radar image with dBz values between 52 and 56. June200911Ângela Lourenço

Blended Course on the Principles of Satellite Meteorology 1615UTC Lisbon IR10.8 (enhanced) where the colours give the cloud top temperature with areas around -64ºC. Light orange pixels may indicate the presence of small ice particles. No bright and yellow spots, no intense updrafts. No visible overshootings at this time. Severe Convection-RGB HRV Maximum dBz values around 56. Lisbon June200912Ângela Lourenço

Blended Course on the Principles of Satellite Meteorology 1630UTC Lisbon No visible overshootings at this time. Severe Convection-RGB HRV IR10.8(enhanced) Lisbon Areas with cloud top temperature around -64ºC. Maximum dBz values around 56. No significant changes since last image. June200913Ângela Lourenço

Blended Course on the Principles of Satellite Meteorology 1645UTC Lisbon Overshooting and evidence of gravity waves at cloud top. Areas with cloud top temperature around -63ºC. Maximum dBz values between 56 and 60. HRV IR10.8(enhanced)Severe Convection-RGB In the central region of the cell mainly light orange and yellowish pixels and a yellow spot on the right. Strong updraft. June200914Ângela Lourenço

Blended Course on the Principles of Satellite Meteorology Radiosonde from Lisbon – 09may UTC CAPE: 832 J/kg CIN: -91 J/kg LI: -2.8 ºC TPW: 22.2 mm (until 389hPa) LCL:~975hPa LFC:~800hPa EL:~250hPa CCL:~845hPa Convective Temperature:~25ºC Tmax: 23.2ºC(13:20UTC) Dry layer from surface until 750hPa. June200915Ângela Lourenço

Blended Course on the Principles of Satellite Meteorology Synoptic Observations Alvega Coruche Highest Wind Gust: 75.2 km/h (1530UTC) Max. Precipitation: 11mm/20min (17/1720 UTC) Non meteorological reports indicated hail and possible larger amounts of accumulated precipitation. 09may UTC Lisbon 09may2009 June200916Ângela Lourenço

Blended Course on the Principles of Satellite Meteorology – UTC – UTC Lightning – 09may2009 June200917Ângela Lourenço

Blended Course on the Principles of Satellite Meteorology HRV – 1500UTC 09may UTC June200918Ângela Lourenço

Blended Course on the Principles of Satellite Meteorology 09may :33UTC Lat: 38°59'47.76"N Long: 8°30'42.25"W Photo : June200919Ângela Lourenço

Blended Course on the Principles of Satellite Meteorology References: Satrep Online – SatRep and SatManu – EUMETSAT- EUMETSAT- MSG Interpretation Guide - Instituto de Meteorologia, I.P., Portugal - NWP Fields (ECMWF), Radar images and Synoptic Observations. Photo – June200920Ângela Lourenço

Blended Course on the Principles of Satellite Meteorology Taken around 15:33UTC in Coruche (Estrada da Lamarosa) - Lat: 38°59'47.76"N Long: 8°30'42.25"W Video from: MET9 RGB i - 09may2009 – sequence from 06 and 19UTC Source: June200921Ângela Lourenço