1 / 4

Christo Georgiev NIMH , Bulgaria

The pre-convective environment: thermodynamic analysis by water vapour imagery channels 6.2 and 7.3 µm. Christo Georgiev NIMH , Bulgaria. Patrick Santurette Météo-France. EUMETSAT CWG Workshop, Landshut 8 – 10 October 200 9. WV IMAGERY DIAGNOSIS OF CONVECTIVE ENVIRONMENT.

akando
Download Presentation

Christo Georgiev NIMH , Bulgaria

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. The pre-convective environment: thermodynamic analysis by water vapour imagery channels 6.2 and 7.3 µm Christo Georgiev NIMH, Bulgaria Patrick Santurette Météo-France EUMETSAT CWG Workshop, Landshut 8 – 10 October 2009

  2. WV IMAGERY DIAGNOSIS OF CONVECTIVE ENVIRONMENT NWP 600 hPa winds  60 kt LOW-LEVEL FORCING: 7.3 m Convection is most likely to develop downstream (right) of a middle-level moisture boundary: a mid-level jet, which originates from a low-level baroclinic zone,Georgiev & Santurette ( 2008) (JET STREAM ANALYSIS PESPECTIVE) UPEPR-LEVEL FORCING: 6.2 m Convection is most likely to develop downstream (left) of an upper-level moisture boundary: upper-level jet, left exit NWP 300 hPa winds  90 kt

  3. MPEF DIVERGENCE PRODUCTfrom MSG 6.2 m Atm. Motion Vectors MPEF DIV, 300 hPa wind (> 80 kt) 1.5 PVU heights (< 1000 dam) convergence divergence upper-level jet PV anomaly WV IMAGERY 6.2 m as a diagnostic tool WV 6.2 m PV anomaly upper-level jet In addition to the stability analysis, a pre-convective environment should be analysed from a dynamic point of viewfor operational purposes. The instability and low-level pre-convective environment are critical for development of deep moist convection. Upper-level forcing mechanisms favour the convection outbreak and may enable further intensification of the convective development. WV imagery / products provide upper-level observation data for diagnoses of: Jet, Potential Vorticity anomaly, divergence of the flow.

  4. MPEF DIV, 300 hPa wind (> 80 kt) 1.5 PVU heights (< 1000 dam) IR 10.8 MPEF DIVERGENCE (DIV) PRODUCTas a diagnostic tool MPEF DIV, 300 hPa wind (> 75 kt) 1.5 PVU heights (> 1000 dam) upper-level divergence upper-level jet upper-level jet PV anomaly PV anomaly upper-level diagnosis:divergent flow, ahead of a PV anomaly, left jet exit Convection initiates over a large area of instability at Southern Europe / Mediterranean. MPEF DIV product (derived from MSG channel 6.2 m Atmospheric Motion Vectors) helps to diagnose the area favourable for development of intense convection: Deep most convective cells develop at the area of upper-level divergence, ahead of a PV anomaly, at the left exit of an upper-level jet.

More Related