GOES VIS series
I inserted a cyan line to denote the front which is discernablein the imagery (when you remove it) and I inserted a grey circle in the area of Igor’s pressure center based on continuityand 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)
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.gifhttp://www.novaweather.net/Uploads/Igor_2010/WTP_PPI3p5_Vel_21_SEP_2010_Igor_anim.gif
(best copy link into browser I think)
• 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)
• 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
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