JET CLOUDINESS (FIBRE) - SHORT SUMMARY
by ZAMG
Example
An extended narrow cloud feature can be seen from the western edge of the image extending to about 50N/20W and further to W. Irelnd.
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Typical cloud configurations
- White in IR and WV, grey in VIS;
- Elongated (several 100s to 1000 km) very narrow cloud bands (10 - 50 km);
- In WV Dark Stripe on the cyclonic side;
- Associated with the jet axis;
- Fibres sometimes cross frontal cloud bands.
Relevant numerical parameters and their typical distribution
- Zero line of shear vorticity at 300 hPa to indicate the jet axis;
- Zero line sometimes shifted 2 - 3 degrees in the anticyclonic direction of fibre (espially at the leading edge of warm front shields), indicating inclination of jet axis with height;
- Isotachs at 300 hPa, as indication for jet intensity and the location of entrance and exit regions.
