Shear vector In Red: Modified butterfly pattern oriented along shear vector Flown twice as storm translates northward (typically at kt) 4-deg. Leg lengths that may be modified In Green Arched race-track pattern over left-of-shear region Examines asymmetries, tilt, precession, bands of precipitation, Examines initial impact of the midlatitude trough (relative angular momentum import, interaction between the decaying PV tower of the TC and the approaching upper-level midlatitude positive PV center. Over Storm Mission during the Transformation Stage of Extratropical Transition Duration: 21.2 h Modified butterfly pattern flown and arched race-track pattern flown at least twice Hurricane Katia 1733 UTC 8 SEP GHz color image with 85 GHz PCT overlaid Imagery courtesy of NRL- Monterey ( Storm track, speed kt

Shear vector Storm track, speed kt In Red: Modified butterfly pattern oriented along shear vector Flown twice as storm translates northward (typically at k 4-deg. Leg lengths that may be modified Hurricane Katia 1733 UTC 8 SEP 2011 GOES 13 Visible image with 85 GHz PCT overlaid. Imagery courtesy of NRL- Monterey ( In Green Arched race-track pattern over left-of-shear region Examines asymmetries, tilt, precession, bands of precipitation, Examines initial impact of the midlatitude trough (relative angular momentum import, interaction between the decaying PV tower of the TC and the approaching upper-level midlatitude positive PV center. Over Storm Mission during the Transformation Stage of Extratropical Transition Duration: 21.2 h Modified butterfly pattern flown and arched race-track pattern flown at least twice

Modified butterfly pattern oriented along shear vector Flown following the TC Typical translation speed ~15-20 kt Approximately 20 h 4-deg. Leg lengths that may be modified Arched race-track pattern over left-of-shear region Examines asymmetries, tilt, precession, bands of precipitation, Examines initial impact of the midlatitude trough (relative angular momentum import, interaction between the decaying PV tower of the TC and the approaching upper- level midlatitude positive PV center UTC 8 Sep UTC 9 Sep 2011 Over Storm Mission during the Transformation Stage of Extratropical Transition Combined Modified butterfly pattern and arched race-track flown twice over an approximately 18-h periods CIMSS Deep shear product 0900 UTC 9 Sep 2011

Environmental Mission during the the Extratropical Stage of Extratropical Transition Figure 4 Examine remnant TC core structure Examine interaction with midlatitude trough to the northwest Transition into a angled lawnmower pattern Lawnmower pattern to examine interface between the decaying TC and midlatitude jet Begin at eastern edge of figure 4 Angle chosen to be perpendicular to outflow orientation related to contribution of TC-outflow to transverse ageostrophic circulation and intensification of the upper-level jet orientation related to the “typical” Q-vector-derived forcing of Q-G frontogenesis related to TC outflow After reaching point “X” fly the pattern in reverse (red segments) for time continuity September 2011 GOES 13 IR image 85 GHz PCT overlaid