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Igor / Front over eastern Newfoundland

Igor / Front over eastern Newfoundland. 21 Sept 2010. 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.

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Igor / Front over eastern Newfoundland

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  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: http://www.novaweather.net/Uploads/Igor_2010/GOES_VIS_12_to_18Z_21_SEP_2010_Igor_anim.gif (best to copy into browser window)

  3. Surface Plots

  4. Doppler Radar

  5. Animation of lowest elevation angle http://www.novaweather.net/Uploads/Igor_2010/WTP_Vel_LOLAA_Igor_2010_anim.gif (open in a web browser) Animation of elev 1.5 deg and 3.5 deg available at: http://www.novaweather.net/Uploads/Igor_2010/WTP_PPI1p5_Vel_21_SEP_2010_Igor_anim.gif http://www.novaweather.net/Uploads/Igor_2010/WTP_PPI3p5_Vel_21_SEP_2010_Igor_anim.gif (best copy link into browser I think)

  6. 3 elevation angles prior to frontal passage over eastern portion of land

  7. PPI 1.5 degrees

  8. PPI 3.5 degrees

  9. 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)

  10. 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

  11. 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

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

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

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