Posted on 09/14/2018 9:41:53 AM PDT by Robert A Cook PE
From a writer at WattsUpWithThat:
National Data Buoy Center shows Florence passing over Johnny Mercer Pier, station JMPN7. The surface anemometer height for that station is 15 meters above sea level. Winds speeds recorded show the eyewall and eye passing directly the station. Maximum sustained winds on the leading edge of the storm were 52 knots at 5.36 AM, followed by the eye with (its typically) low winds at 7am, followed by the trailing eyewall winds of 56 knots at 8am. https://www.ndbc.noaa.gov/station_page.php?station=jmpn7
Several NDBC stations in the region, both on the shore and offshore, confirm that Florence never produced sustained winds reaching hurricane threshold, which is 64 knots. Recorded winds using anemometers at 10 meters above the local site are part of the definition of the Saffir-Simpson scale. Actual heights of anemometers may be at different heights above the surface, with higher instruments showing higher winds. For example, the offshore NDBC station 41037 at Wrightsville Beach records maximum sustained winds of 50 knots with anemometer height of 3 meters.\ The Cape Lookout station CLKN7 anemometer height is 16 meters, and is located well to the North of the storm center on a dune that seems to produce a Bernoulli effect for winds originating offshore. That anemometer shows sustained winds reaching 71 knots. But the nearby station BFTN7 at Beaufort, NC showing only 51 knots hours later. All other surface stations are recording sustained winds in the 50 knot range, with only the Cape Lookout station as an outlier.
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