Doppler radar quick-looks from 4 PM P-3 flight into Tropical Storm Leslie, 7 September 2012

As Tropical Storm Leslie slowly moved north toward Bermuda NOAA P-3 and G-IV missions collected airborne Doppler radar data to use in initializing and evaluating model guidance. Included here you see images of the horizontal winds within the inner core of Leslie sampled from the tail Doppler radar on the P-3 and the G-IV late on 7 September 2012. These images are at three altitudes, 1 km, 3 km, and 6 km, using a composite of winds from two legs from the P-3 oriented northwest-southeast and northeast-southwest, and two circumnavigations of the storm at two radii from the G-IV. Also plotted on these analyses are the locations of dropsondes deployed by the P-3 and the G-IV (plotted using standard station symbols). These analyses show that Leslie has a clear circulation center at all altitudes shown, but is still relatively asymmetric with the stronger winds north and east of the circulation center. The circulation center is only slightly tilted from south to north with increasing altitude from 1-km altitude to 6-km. The distribution of precipitation is also very asymmetric at all altitudes shown, but particularly above 3-km altitude, with much more coverage to the north and east. The asymmetry in the winds, precipitation, and the observed tilt with increasing altitude suggests that Leslie is embedded in southerly shear. As in the earlier analysis, a double wind maxima to the northeast of the circulation center is clearly apparent at the 1 and 3-km altitude wind distribution, one at 50 nm and the second near 80 nm from the center. There is no apparent inner wind maximum south or west of the center suggesting that the inner wind maximum is decaying and being replaced by the larger wind maximum.

All the Leslie radar composites at 0.5-km height resolution are available at http://www.aoml.noaa.gov/hrd/Storm_pages/leslie2012/radar.html.