{"id":3791,"date":"2022-09-28T10:25:17","date_gmt":"2022-09-28T15:25:17","guid":{"rendered":"https:\/\/www.ssec.wisc.edu\/jpss-sdoc\/?p=3791"},"modified":"2026-03-16T14:18:26","modified_gmt":"2026-03-16T19:18:26","slug":"hurricane-ian-on-28-september-2022","status":"publish","type":"post","link":"https:\/\/www.ssec.wisc.edu\/jpss-sdoc\/posts\/hurricane-ian-on-27-september-2022-october-2022\/hurricane-ian-on-28-september-2022\/","title":{"rendered":"Hurricane Ian on 28 September 2022"},"content":{"rendered":"

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As of the 1500 UTC public advisory from the National Hurricane Center (NHC), Hurricane Ian had maximum sustained winds of 155mph, making it a strong Category 4 storm<\/a><\/strong> and was moving on shore to the Florida Peninsula. Roughly 8 hours prior, Hurricane Ian was only a Category 3 storm<\/strong> with 120mph sustained winds, according to the NHC at 0700 UTC<\/a>. NOAA-20’s pass occurred roughly 14 minutes later at 0714UTC with a near nadir pass. Similar to yesterday’s analysis, the high resolution (375m) I05 (11\u03bcm) brightness temperature imagery showed a well defined circulation indicative of a intense hurricane, but several tropospheric gravity waves, along with a well defined eye.<\/p>\n\n\t\n\t\t\n\t\t\t<\/polyline>\n\t\t\t<\/polyline>\n\t\t\t<\/polyline>\n\t\t\t<\/polyline>\n\t\t\t<\/svg>\n\t\t<\/span>\n\t<\/span>\n<\/div>\n\n\n

Alt text – A slider image an image of a well hurricane in the thermal bands over the eastern part of Florida, with green (warmer) and red (cooler) regions showing the temperature of the clouds from 3:14am Eastern time on 28 September. One image does not have labels, the other labels a well defined eye with tropospheric gravity waves and the feeder bands<\/h6>\n

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When you zoom in, you can easily see these features as well. One of the interesting thing to note is that the eye is not exactly symmetrical. It is possible that, as mentioned in the 0900 Forecast discussion<\/a>, there was a little shear, so perhaps that is what is being seen<\/p>\n\n\t\n\t\t\n\t\t\t<\/polyline>\n\t\t\t<\/polyline>\n\t\t\t<\/polyline>\n\t\t\t<\/polyline>\n\t\t\t<\/svg>\n\t\t<\/span>\n\t<\/span>\n<\/div>\n\n\n

Alternate text – A zoomed slider image an image of a well hurricane south of Tampa in the thermal bands over the eastern part of Florida, with green (warmer) and red (cooler) regions showing the temperature of the clouds from 3:14am Eastern time on 28 September. One image does not have labels, the other labels a well defined eye with tropospheric gravity waves and the feeder bands<\/h6>\n

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The moon was at Waxing crescent (8% illumination), meaning that the primary source of light in the DNB is from airglow. While this means that the finer structures are not able to be seen, it does allow for faint mesospheric gravity waves to be seen, something which has been observed during intensifying storms. In addition, the well developed eye was easily seen again in the DNB imagery<\/p>\n

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Alternate text – A black and white image of the VIIRS Day Night Band from 3:14am Eastern time on 28 September with labels for the eye and mesospheric gravity waves<\/h6>\n\n\t\n\t\t\n\t\t\t<\/polyline>\n\t\t\t<\/polyline>\n\t\t\t<\/polyline>\n\t\t\t<\/polyline>\n\t\t\t<\/svg>\n\t\t<\/span>\n\t<\/span>\n<\/div>\n\n\n
Alternate text – A black and white slider image of the VIIRS Day Night Band from 3:14am Eastern time on 28 September with and without\u00a0 labels for the eye and mesospheric gravity waves<\/h6>\n\n\t\n\t\t\n\t\t\t<\/polyline>\n\t\t\t<\/polyline>\n\t\t\t<\/polyline>\n\t\t\t<\/polyline>\n\t\t\t<\/svg>\n\t\t<\/span>\n\t<\/span>\n<\/div>\n\n\n
Alternate text – A black and white slider image of the VIIRS Day Night Band and the thermal channel from 3:14am Eastern time on 28 September without\u00a0 labels for the eye and mesospheric gravity waves<\/h6>\n

In addition to the IR and microwave imagery from NOAA-20, there was also a good pass from AMSR2 on GCOM-W1 roughly 20 minutes after NOAA-20 observed the storm. This provided a good opportunity for a comparison between AMSR2 and ATMS<\/p>\n\n\t\n\t\t\n\t\t\t<\/polyline>\n\t\t\t<\/polyline>\n\t\t\t<\/polyline>\n\t\t\t<\/polyline>\n\t\t\t<\/svg>\n\t\t<\/span>\n\t<\/span>\n<\/div>\n\n\n

Alternate text – a slider image of\u00a0 thermal channel from 3:14am Eastern time on 28 September without labels from ATMS on NOAA-20 and 3:35am Eastern time on 28 September from AMSR2<\/h6>\n

As can be seen above, the two sensors agree that the circulation is completely encompassed by convection, with the AMSR2 imagery showing much greater structure than the ATMS instrument, as expected. However, the circulation is much clearer in the ATMS imagery than yesterday<\/p>\n

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Alternate text – a image of\u00a0 thermal channel from 3:14am Eastern time on 28 September without labels from ATMS with red being colder near the eye and blue being warmer.<\/h6>\n

One of the other products from AMSR2 is a precipitation product, which is used as input to the CMORPH2<\/a> blended product. What can be seen is, at the time of the AMSR2 pass, most of the precipitation was offshore.<\/p>\n

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Alternate text – an image of\u00a0 the hurricane rain rate product from Hurricane Ian taken at 3:35am Eastern time on 28 September from AMSR2, showing the precipitation circulating around the eye, with cyan being light rain and pink being heavy rain.<\/h6>\n

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This is very consistent with what was going on with Hurricane Ian at the time as well as what is currently happening. This is because most of the precipitation occurs where the most convection occurs, which can be seen when comparing the VIIRS IR imagery and the AMSR2 precipitation imagery, shown below<\/p>\n\n\t\n\t\t\n\t\t\t<\/polyline>\n\t\t\t<\/polyline>\n\t\t\t<\/polyline>\n\t\t\t<\/polyline>\n\t\t\t<\/svg>\n\t\t<\/span>\n\t<\/span>\n<\/div>\n\n\n

The current forecast has Ian making landfall in the next several hours, with catastrophic damage and flooding expected to occur. Over the next several days satellites will help in observing the impacts from flooding and power outages after Ian departs Florida and the SE US.<\/p>\n

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11 AM EDT 9\/28 Key Messages for Hurricane #Ian<\/a>. <\/p>\n

Catastrophic storm surge inundation of 12-18 ft above ground level expected somewhere between Englewood to Bonita Beach, including Charlotte Harbor. Catastrophic wind damage is also beginning.<\/p>\n

Latest: https:\/\/t.co\/tnOTyfOjMY<\/a> pic.twitter.com\/ueCnGSMEQE<\/a><\/p>\n

— National Hurricane Center (@NHC_Atlantic) September 28, 2022<\/a><\/p><\/blockquote>\n