<div dir="ltr">Yes, I was also looking at this. Very impressive, and HWRF has several cycles predicted similar double eyewall structures.<div><br></div><div><a href="https://radar.weather.gov/radar.php?product=N0Z&rid=BRO&loop=yes">https://radar.weather.gov/radar.php?product=N0Z&rid=BRO&loop=yes</a><br></div><div><br></div><div>Bin</div></div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div><span style="font-size:12.8000001907349px"><div><span style="font-size:12.8000001907349px">---</span><br></div><div><span style="font-size:12.8000001907349px">Bin Liu</span><br></div></span><div style="font-size:12.8000001907349px">NOAA/NWS/NCEP/EMC</div><div><span style="font-size:12.8000001907349px">5830 University Research CT</span></div><div><span style="font-size:12.8000001907349px">Cubicle 2026</span><br><span style="font-size:12.8000001907349px">College Park, MD 20740</span><br><span style="font-size:12.8000001907349px">Tel: </span>(301)-683-3763<br><span style="font-size:12.8000001907349px">Email: <a href="mailto:Bin.Liu@noaa.gov" target="_blank">Bin.Liu@noaa.gov</a></span></div></div><div><br></div><div><br></div></div></div></div></div></div></div></div></div></div></div></div>
<br><div class="gmail_quote">On Fri, Aug 25, 2017 at 11:17 AM, Sergio Abarca <span dir="ltr"><<a href="mailto:sergio.abarca@noaa.gov" target="_blank">sergio.abarca@noaa.gov</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word"><div>All,</div><div>It looks like<b> Harvy has indeed a concentric eyewall -with a very narrow moat-</b>. See attached the radar image of the Brownsville radar. </div><div><br></div><div>I list below 5 days worth of cycles that included a forecasting time valid at 082506. HWRF forecasted a concentric eyewalls (as diagnosed by a secondary wind maxima in the azimuthal average of wind, considering a prior radial expansion of the tangential wind field) at least in 50% of these cycles and 75% of the cycles that have Harvey initialized in the Gulf of Mexico. Those cycles initialized outside of it, including the Caribbean had a harder time forecasting it. </div><div>Sergio</div><div><br></div><div>All Harvey cycles with a forecasting hour valid at 082506. Tose with secondary eyewall or hints of it are <b>highlighted in bold face listing the time when the secondary eyewall was most apparent</b>:</div><div>082506</div><div>082500</div><div><b>082418 at f15 (very narrow moat)</b></div><div><b>082412 at f24</b></div><div><b>082406 has hints of it</b></div><div><b>082400 at f24</b></div><div><b>082318 at f18</b></div><div><b>082312 at f42</b></div><div>082306-can’t display</div><div><b>082300 at f48</b></div><div>082218 </div><div>082212 </div><div><b>082206 - h54</b></div><div>082200 </div><div><b>082118 at f72</b></div><div>082112 </div><div>082106 </div><div><b>082018 at f102</b></div><div>082012</div><div>082006 </div><div><br></div><div><br></div><img id="m_-6743121248958029762C288080D-97A0-441F-BF62-5EA5798811CA" src="cid:8881A02B-C8AD-4E9F-9579-CBEB3211C6E7"></div></blockquote></div><br></div>