1. Igor / Front over eastern Newfoundland
21 Sept 2010

2. GOES VIS series
I inserted a cyan line to denote the front which is discernable
in the imagery (when you remove it) and I inserted a grey
circle in the area of Igor’s pressure center based on continuity
and clearer area near center
Animated gif of satellite:
(best to copy into browser window)

12. Surface Plots

17. Doppler Radar

18. Animation of lowest elevation angle
(open in a web browser)
Animation of elev 1.5 deg and 3.5 deg available at:
(best copy link into browser I think)

19. 3 elevation angles prior to frontal passage over eastern portion of land

20. PPI 1.5 degrees

21. PPI 3.5 degrees

22. Winds veered to the south as the sharp front approached St John’s (YYT/XSW) and Cape Race (WRA)
XSW: 120 at 14Z, 140 at 15Z, 170 at 16Z, 340 at 17Z – sharp shift of almost 180 degrees consistent with sharp front moving west to east, not low center passage moving south to north
Airport site YYT had 6-degree temp drop from 16 to 17Z (16C to 10C, 61F to 50F)

23. Cape Race had similar trend, however data went offline as storm moved by
WRA: 120 at 13Z, 130 at 14Z, 180 at 15Z, then offline

24. High-res Model
High-res (2.5km horiz scale) local area model (GEM-LAM2.5) depicted the veering wind ahead of front and passage of absolute center of Igor just offshore

25. St John’s (XSW/YYT) and Cape Race (WRA) red circles

29. Model temp and pressure pattern (note kinked pressure pattern assoc
Model temp and pressure pattern (note kinked pressure pattern assoc. with front)