Composite cross section analysis for 0000 GMT 16 April 1976 along the line AA´ of Fig. 7. Wind speed (m s-1), heavy dashed lines; potential temperature (K), solid lines. Flight path, light dashed lines with GMT hours, solid circles.

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NOAA Gulfstream IV

20 km

10 km

Surface

Potential Temperature (4-K interval)

COAMPS (20 km x 200 m) James Doyle (NRL/Monterey)

20 km

10 km

Surface

Geopotential height (m) and wind speed (m/s)

500 hPa 300 hPa

Subtropical JetstreamSubtropical JetstreamPolar JetPolar Jet

5-6 Feb 1999 theta cross section

8-9 Feb 1999 theta cross section

8-9 Feb 1999 winds

8-9 Feb 1999 DTF turbulence

1544 UTC 5 Jan. 2003

^^^^^

Greenland

East

GreenlandEast