In the last two weeks of April 1997 JCMM carried out an internal workshop to produce an overview of the various FASTEX Intensive Observation Periods (IOPs). The resulting information in these pages is in two forms; firstly overview tables to enable the characteristics of a number of IOPs to be quickly compared and secondly more detailed information about each IOP. The information consists of subjective comments about each IOP as well as animations and other information relating to the meteorological situations and the available observations. It is hoped that these pages will be helpful to anyone who is considering which FASTEX IOP they should study for a particular purpose.

More Details about the Workshop

About these web pages/Contact details

Overview Tables

These provide information about all IOPs of interest under a number of headings in order to facilitate quick and easy comparison.

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Basic Information



Tropopause Structure

Diabatic Processes


Forecast Accuracy

Links to detailed information about each IOP

IOP1 Systematic survey of transient frontal wave low on a cloud complex.

IOP2 Phenomenon investigation of warm sector wave on a meridional flow

IOP3 Interaction of a trough drifting southwards and a wave on a cold front

IOP4 A cold-air comma cloud system moving slowly into the SW part of the MSA

IOP5 Two cyclones developed on a trailing cold front, the second developed preferentialy

IOP6 Intense north-south front without waves in the MSA

IOP7 Flat Frontal Wave translating rapidly NE through Western Half of MSA

IOP8 Downslope wave phenomenon to the lee of Greenland (Non FASTEX case)

IOP9 Large, well developed cyclone. Second deepening phase near Iceland.

IOP10 Weak frontal wave with strong convection and no closed circulation.

IOP11 Primary cyclone formed over E America and deepened while crossing the Atlantic

IOP11A Developing cold frontal wave - classic example of a FASTEX cyclone

IOP12 Investigation of Explosive Cyclogenesis.

IOP13 Decaying mature wave heading towards Northern Britain

IOP14 Slowly weakening, enlongated low

IOP15 Excellent 3-arc systematic survey of mature cyclone occlusion in the MSA

IOP16 Fast moving, rapidly deepening, secondary wave cyclone

IOP17 The "FASTEX CYCLONE": explosively deepening col wave.

IOP18 Good life-cycle coverage of explosive cyclonic development

IOP19 Very weak open wave on the trailing cold front of a primary cyclone

Last Updated: 3/11/97

Humphrey W Lean | | hwlean@meto.gov.uk