FASTEX workshop programme

09.15

Opening of the Workshop
D. Cariolle, Director of Research, Météo-France,
J.P. Chalon, Chairperson of the FASTEX Core Steering Group,

9.45

Presentation of the Workshop, its aim and follow ups
A.J. Thorpe, Chairperson of the FASTEX Scientific Steering Group

10.00

An overview of the field phase of FASTEX
presented by A. Joly

Note that the a priori authors for the written version should read something like: A. Joly, P. Bessemoulin, K.A. Browning, J.P. Cammas, J.P. Chalon, S.A. Clough, R. Dirks, K.A. Emanuel, R. Gall, P.H. Hildebrand, D. Jorgensen, R.H. Langland, Y. Lemaitre, P. Mascart, J.A. Moore, P.O.G. Persson, M.A. Shapiro, C. Snyder, Z. Toth, R.M. Wakimoto: these are all the active "PIs" during the field phase.

10.30

Break

1.  The FASTEX Data

Chairperson: A.J. Thorpe

10.45

The FASTEX Data Base: overview, status of special FASTEX data in the FASTEX Central Archive (radiosoundings, data collected by the research ships and aircraft)
G. Jaubert and C. Piriou, Météo-France, France

11.00

The FASTEX Central Archive: status of included operational World Weather Watch data
C. Piriou and G. Jaubert, Météo-France, France

11.15

The FASTEX Central Archive: satellite and model data
G. Jaubert and C. Piriou, Météo-France, France

11.30

An overview of the FASTEX High Resolution Sounding Dataset
J.A. Moore and S. Loehrer, UCAR, USA

11.50

Discussion on the FASTEX data and data bases

12.30

Lunch Break

2.  Synoptic-dynamic studies of cases

Chairperson: M.A. Shapiro

Overviews of several cases

13.45

A JCMM workshop overview of FASTEX IOPs and their research application
S.A. Clough, H.W. Lean, N.M. Roberts, H. Birkett, J.P. Chaboureau, R. Dixon, M. Griffiths, T.D. Hewson and A. Montani, JCMM, UK

14.05

Dynamical summary and characterization of a number of FASTEX cases
Ch. Baehr, B. Pouponneau, F. Ayrault, T. Bergot and A. Joly, Météo-France, France

14.25

Role of frontogenesis on frontal wave development in FASTEX
J.P. Chaboureau and A.J. Thorpe, University of Reading, UK

Case studies

14.45

Overview of the life-cycle of a FASTEX cyclone: IOP 17
J.P. Cammas, B. Pouponneau, G. Desroziers and P. Santurette, CNRS and Météo-France, France

15.05

Break

15.30

Role of environmental flow and contribution of a continental low on the triggering of the FASTEX cyclone (IOP 17)
I. Mallet, J.P. Cammas, Ch. Baehr and Ph. Arbogast, CNRS and Météo-France, France.

15.50

Upper-level dynamics of a FASTEX cyclone: IOP 18
J. Donnadille, D. Lambert, J.P. Cammas and P. Mascart, CNRS, France

16.10

Identification of tropopause-level thermal anomalies from TOVS observations
N. Fourrié, C. Claud, R. Armante, B. Pouponneau, J.P. Cammas, CNRS and Météo-France, France

16.30

Application of exergy theory to local atmospheric energetics: diagnostics for a FASTEX case
P. Marquet, Météo-France, France

16.50

Discussion on synoptic-dynamic studies of life-cycles

Potential vorticity inversion and applications

17.10

Reduced upper-tropospheric potential vorticity
H.R. Birkett and A.J. Thorpe, University of Reading, UK

17.30

Systematic precursors identification of FASTEX IOPs using potential vorticity inversion
E. Chaigne and Ph. Arbogast, Météo-France, France

17.50

``ice-breaker'' offered by Météo-France

Synoptic-dynamic studies of cases (continued)

Chairperson: M.A. Shapiro

Potential vorticity inversion and applications (continued)

9.00

The role of the tropopause in destabilizing the atmosphere
M. Griffiths, A.J. Thorpe and K.A. Browning, JCMM, UK

9.20

Potential vorticity inversion within the planetary boundary layer
Ph. Arbogast, Météo-France, France

9.40

Forecast failure of synoptic systems related to tropopause level flow inaccuracies: a climatology
R. Fehlmann and H.C. Davies, ETH, Switzerland

10.00

Sensitivity of the FASTEX IOP 18 life-cycle to the boundary layer structure
Ph. Arbogast and J.P. Cammas, Météo-France and CNRS, France

10.20

Discussion of the usage of potential vorticity

10.40

Break

3.  Theories and climatologies on cyclogenesis and frontogenesis

Chairperson: K.A. Browning

11.00

The ageostrophic circulation in baroclinic waves growing on frontal temperature gradients
M. Juckes, Munich University, Germany

11.20

The interpretation of upstream and downstream development revisited
S. Malardel and Ph. Arbogast, Météo-France, France

11.40

Discrete frontal propagation induced by land-sea boundary
J.J. Charney and J.M. Fritsch, Penn State University, USA

12.00

Climatological reality and paradigmatic types of North-Atlantic cyclones derived from ECMWF re-analyses
F. Ayrault, A. Joly and B. Pouponneau, Météo-France, France

12.20

Discussion on theories and climatologies

12.40

Lunch break

4.  Predictability, adaptive observations

Chairperson: A. Joly

14.00

Dynamics and statistics of forecasts errors in a quasi-geostrophic model
C. Snyder, S. Trier and R. Morss, NCAR and MIT, USA

14.20

Adaptive observation strategies: experiments with a quasi-geostrophic model
R. Morss, K. Emanuel and C. Snyder, MIT and NCAR, USA

14.40

Ensemble-based targeted observations during FASTEX
I. Szunyogh, Z. Toth, C.H. Bishop, K. Emanuel, Ch. Snyder, J. Woollen, W.S. Wu, T. Marchok and R. Morss, UCAR and NCEP, USA

15.00

Adjoint-based targeted observations during FASTEX: impact and feasability studies
T. Bergot, B. Pouponneau, G. Desroziers and A. Joly, Météo-France, France

15.20

Break

15.40

Use of ECMWF singular vectors for targeting during FASTEX
A. Montani and A.J. Thorpe, University of Reading, UK

16.00

Impact of FASTEX data on numerical weather prediction forecasts
S.R. Anderson, R.J. Graham and M.J. Bader, UK Met Office, UK

16.20

The NORPEX 98 field experiment
Z. Toth, I. Szunyogh, T. Marchok, S. Majumdar, C.H. Bishop, J. Woollen, P. Caplan and R. Morss, NCEP and UCAR, USA

16.40

Direct use of sensitivity information to improve operational forecast: case studies
G. Hello, Météo-France, France

17.00

Discussion on targeting

5.  Cloud system observations and studies, mesoscale structures

Chairperson: J.P. Chalon

9.00

The structure of the FASTEX IOP 18 cyclone: observations and numerical simulations
D.P. Jorgensen, J.D. Doyle, M.A. Shapiro and T. Shepherd, NOAA and NRL, USA

9.20

Analysis of radar and dropsonde data for IOP 12 and 16
D. Bouniol, Y. Lemaître and G. Scialom, CNRS, France

9.40

Comparison of structures found in C-130 dropsonde data from FASTEX IOP 16 with those in UKMO Unified Model integrations
S.A. Clough, H.W. Lean and N.M. Roberts, JCMM, UK

10.00

Mesoscale structure of cold and warm fronts (IOPs 2 and 11)
B. Bosart and R.M. Wakimoto, UCLA, USA

10.20

Break

10.40

Precipitation, kinematic and thermodynamic structure of the mid-latitude cyclone observed on 19 February 1997 (IOP 17) during FASTEX with airborne Doppler radar and dropsondes
M.P. Moine and F. Roux, CNRS, France

11.00

Aircraft observations of surface-level frontal circulations and structures in FASTEX
P.H. Hildebrand, NCAR, USA

11.20

Mesoscale circulation within systems sampled during FASTEX
G. Scialom, Y. Lemaître and A. Protat, CNRS, France

11.40

Discussion on the use of the Doppler radar data

12.10

Mesoscale analysis of arc rainband in a dry slot
K.A. Browning and N.M. Roberts, JCMM, UK

12.30

Mesoscale substructures within extratropical cyclones over the North-Atlantic and Eastern Pacific oceans: research aircraft observations and numerical simulations
M.A. Shapiro, NOAA, USA

12.50

Lunch break

6.  Air-sea interaction and cyclogenesis

Chairperson: D. Jorgensen

14.00

The sea surface flux dataset collected during the CATCH/FASTEX experiment
G. Caniaux, L. Eymard, D. Bourras, C. Guerin, H. Dupuis and H. Giordani, Météo-France and CNRS, France

14.20

Simulations of North-Atlantic storm-track variability
D.N. Bresch, R. Fehlmann, H.C. Davies, ETH, Switzerland

14.40

Structure of the boundary layer during the FASTEX IOP 18 and cyclogenesis sensitivity to upper-level forcing
D. Lambert, J. Donnadille, J.P. Cammas and P. Mascart, CNRS, France

15.00

Discussion on the potentials of the air-sea interaction dataset collected during CATCH/FASTEX

15.20

Break

7.  Data assimilation, modelling and forecasts of FASTEX cases

Chairperson: S. Clough

15.40

Sensitivity to air-sea exchange processes during the early stages of development of FASTEX low 41 (IOP 17)
I. Mallet, J.P. Cammas and P. Mascart, CNRS, France

16.00

Numerical model forecasts of frontal waves
T. Hewson, JCMM, UK

16.20

Some variational data assimilation experiments for the FASTEX IOP 17 and others
M. Janiskova, F. Veerse and J.N. Thepaut, Météo-France, France

16.40

Remarks drawn from the comparison of the real time synoptic forecasts performed during FASTEX
P. Santurette and Y. Bachimont, Météo-France, France

17.00

4D-VAR reanalysis of the FASTEX data
G. Desroziers, B. Pouponneau, J.N. Thepaut, M. Janiskova and F. Veerse, Météo-France, France

17.20

Discussion on re-analysis needs of the FASTEX data

17.45

The FASTEX project as seen from the Institut National des Sciences de l'Univers, L. Eymard, representing the Director of INSU.

8.  Final discussion and future plans

9.00

Discussion on future plans: next meetings, follow-on projects

10.00

The end of the workshop

9.  The FASTEX-CSS project

The remaining of the day will be dedicated to starting-up the FASTEX Cloud System Study project. It is a european initiative supported by the European Commission to exploit the FASTEX data with a view to improve the description of clouds in large-scale modelling (data assimilation and climate studies) using the GEWEX-CSS strategy. This is a meeting open only to FASTEX-CSS participants.

10.00

Meeting opens; A.J. Thorpe, project coordinator

16.30

Meeting ends