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 Event Summary

Hurricane Helene made landfall as a Category 4 hurricane in the Florida Big Bend region at approximately 11:10 PM EDT on Thursday, September 26th just east of the mouth of the Aucilla River, which is about 10 miles west-southwest of Perry, Florida. Based on data from Air Force reconnaissance aircraft, the maximum sustained winds were estimated to be 140 mph and the minimum central pressure at 938 mb (27.70 inches). From there Hurricane Helene would continue to rapidly move northward as it continued to be influenced by an upper trough across the eastern CONUS, with its center being located near Knoxville/Morristown Tennessee at 11:00 AM EDT on Friday, September 27th only 12 hours later, leaving a path of significant to catastrophic flooding and wind damage as it moved northward. By this time, the NWS Charleston County Warning Area (CWA) had begun to see noteworthy impacts from Helene (downgraded to a tropical storm by this point), with wind gusts of 50 mph occurring across portions of the far southern CWA, as well as locally heavy rain. The 8:00 AM EDT (12Z) upper air sounding from Greensboro, North Carolina would foreshadow the intense wind field set to impact portions of the area later in the day, with winds of 60 knots (69 mph) measured just 5,600 feet above ground level there!

Helene would quickly deviate its track to the west-northwest as it began to pivot around an increasingly cut off upper-level low, moving from southeast Kentucky to near Louisville, Kentucky by 6:00 PM EDT on Friday, September 27th, gradually becoming post-tropical as it did so. This time period coincided with the most intense impacts across the NWS Charleston CWA, with strong to damaging wind gusts occurring across much of the CWA, along with locally heavy rain that resulted in isolated flash flooding. Overall, the greatest impacts were felt across the southern and western portion of the CWA, including southwest Virginia, southern and west-central West Virginia, northeast Kentucky, and portions of southeast Ohio. Wind gusts of 50-60+ mph were not uncommon in these locations, as Helene's heavy rainbands helped to bring strong low-level winds to the surface. Northeast Kentucky and far southern Ohio were hit by far the hardest in terms of rainfall, with rain totals of 2-5"+ in some locations. The highest wind gust recorded was 70 mph at the Automated Surface Observing System (ASOS) at the Huntington (WV) Tri-State Airport, the second highest gust ever recorded at the station! The intense wind gusts associated with the remnants of Helene resulted in numerous trees down across the area, and even some structural damage.

It should be noted that locally heavy, but mainly beneficial rainfall occurred in advance of Helene from late Wednesday, September 25th into the early Friday, September 27th in the form of a Predecessor Rain Event (PRE), with even a tornado occurring during the evening of September 25th in Pocahontas County (WV). This was the first documented tornado to occur in Pocahontas County - see here for more information. Additionally, rounds of showers, some locally heavy at times, continued to impact the NWS Charleston forecast area from Saturday, September 28th through Tuesday, October 1st as the lingering remnants of Helene continued to interact with the aforementioned cut off upper-low just west of the area, with the remnants of Helene continuing to dissipate as time went on and the upper low shifted east across the area. A crossing cold front on October 2nd would finally end the chance for precipitation across the region bringing dry weather area-wide. Overall, rainfall associated with this event was largely beneficial across the NWS Charleston CWA, especially considering much of the forecast area was in an ongoing extreme to exceptional drought in advance of this event.

Please click on the tabs below for more detailed information about this event. Please note that all images/loops can be expanded by clicking on them.

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September 26-27 Regional Radar Loop of Helene

Radar loop courtesy of Iowa Environmental Mesonet (IEM)

 

Image     September 26-27 Regional GeoColor Satellite     Loop of Helene (GOES-16)

Satellite loop courtesy of RAMMB-CIRA

 

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Significant Roof Damage in Oak Hill, Ohio

Telegram Photo by Jeremiah Shaver

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