Windspeed
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Looks like we're in the spiral galaxy phase of Erin's lifecycle... lol
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Erin is crawling right now. With its large circulation, upwelling is starting to become a real issue for it. Additionally, Erin is really helping to bring down SSTs east of the Bahamas. This should help keep anything down the road that traverses that region in check until SSTs can rebound somewhat in late August and early September.
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I concur. It looked like it was really going to take off again this morning, but concentric banding and increasing shear are keeping Erin's core in check. The windfield continues to expand. Slill a large and powerful major hurricane, but it should weaken, albeit slowly, from here on out.
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Yeah, I'm starting to feel like I may eat my words that Erin would never be able to regain Category 5 intensity. It may still not, depending on how much it needs to bomb a pressure drop to contract that RMW enough to get there again. But deep convection is really circumventing the eyewall at present, and at this rate, all the old cloud debris in the eye should dissipate at some point this morning. If we get a warm symmetrical eye during the daylight hours today, it may well exceed my expectations. We're going to have some interesting recon flights today.
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NHC upgraded Erin back to Category 4, 115 KTs/130 MPH for the 11PM AST package, though that may have been just a tad generous. Recon just sampled 119 KT at flight level in the NE quadrant and 948 mb minimum pressure. However, Erin does appear to be getting its act together tonight and near a period of intensification soon regardless. Of note, they report that the eye is closed at 30NM diameter. Erin is a large hurricane now and has a window to contract its RMW. So, the forecast for a higher end Category 4 isn't unreasonable through early Tuesday prior to stronger shear values encroaching on the circulation.
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Though I do think Erin's core will complete organizing a new dominate and large eyewall at some point in the next few days, I think the RMW will have spread out too much for Erin to become a Category 5 again. When we have fast smooth transitions between EWRCs in the highest end TCs, the handoff of the windfield to new eyewall can allow the new eyewall to keep the RMW still somewhat compact or at least recontract it. Therefore, if the new eyewall remains with intense convection, the resultant pressure plunge can allow the TC to reapproach or even surpass its former peak. But the atmospheric and thermal environment has to remain prestinely favorable. We saw this with Irma through several EWRCs, Ian also comes to mind, among others, as Atlantic examples. Certainly, plenty of WPAC typhoons have reintensified dramatically after EWRCs. But in Erin's case, though it should get its act together and may reintensify some, it will likely run out of time to contract its RMW too much regardless of a dominate eyewall due to increasing shear on Monday through Wednesday. I could see it reaching Category 4 again, maybe, but I seriously doubt it could pull off Category 5 again. So, to answer your question, No Sir...
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Observing radar the past 12 hours has been fascinating. Erin's small inner eyewall refuses to die. Its ring will weaken for a time, then come back with intense DBZ echoes. Yet, the outer concentric band remains but doesn't appear to be intensifying enough to allow the inner eyewall to finally choke off and collapse. So Erin appears to be in a long-duration replacement cycle. Some mentioning of shear might be the culprit. However, I don't agree with that assessment because these are relatively low values that shouldn't be enough to disrupt the process. We've seen these cycles complete with even moderate shear. I suspect the concentric band is just taking a long time to reach an intensity that would create enough subsidence to do the deed. These processes remain highly unpredictable, statistically, and quite chaotic, so it's really difficult to forecast how an EWRC will unfold with regard to time. Eventually, the outer band should strengthen enough to finish the cycle. But for now, it seems Erin is in a steady state, and the earlier abrupt rise in pressure has stabilized. Erin's RMI should continue to expand, and the hurricane should become quite large. Eventually, we should get a larger eye, and it may clear out. Though I don't think Erin will be able to reintensify enough to regain its peak intensity from Saturday. Especially considering that southwesterly shear should increase by Monday enough to keep it in check. It should still remain a Category 3 or 4 as it increases in size, however.
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RE: US impacts, despite the westward adjustments, they overall will not change. The 500 dm heights of the WATL ridge may be slightly underdone versus modeling, and Erin may also be pumping the SW periphery at present due to its extreme intensity; however, the mid-latitudinal troughs are still coming with a dome behind them that is on a collision course with Erin by 70°W. Erin will go with the southerly flow as Azores ridging drops SW, hooking it N, then NE and swiftly out into the North Atlantic. Interestingly, Erin's deep transition combined with strong rebuilding of the Bermuda extension of WATL heights late next week may spell trouble for what might be down the pipeline, however. But we'll save that for the main seasonal thread.
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I dare say Erin has continued to deepen merely looking at radar and satellite imagery. We may be looking at a sub 910 hPa Atlantic hurricane now. This eyewall has taken on Irma and Dorian visuals for that location of the Atlantic Basin.
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scheiße...
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St. Maarten's radar is in closer proximity to Erin's core and, therefore, has better returns from the northern semicircle of Erin's outer circulation. As such, concentric banding is a little more evident here. Perhaps even with a moat forming in-between the northern outer band and Erin's northern eyewall. So we may not be long from an EWRC initiating now during peak intensity. Very thankful recon made those few final passes earlier.
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Not really anything impressive yet with regards to concentric banding around Erin's donut of an eyewall. Granted, this is a good distance away from San Juan's radar tower. Erin continues to have a small but stable eyewall for now.
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Wow
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I mentioned earlier that Erin is embedded in an above mean background pressure regime. So if we get readings down near 910 hPa before Erin levels off, we may see some higher sustained winds yet. We saw this during Dorian and Irma near their peaks, though I'm not saying Erin will get that intense. 150 kts/175 mph sustained doesn't seem unreasonable now, however.
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Wow at that dropsonde from the previous pass, which splashed down in the SW eyewall.
