National Weather Service United States Department of Commerce

Overview

Strong low pressure deepened off the coast of northeast South Carolina/southeast North Carolina on 10/11, before tracking just off the NC/VA coast on 10/12. Meanwhile, ~1034mb high pressure was building from Quebec to New Brunswick. The resulting pressure gradient resulted in a period of strong NE winds (25-35 kt with gusts to 45 kt) over the AKQ marine area on 10/12. While these winds were ~5 knots lower than much of the guidance had been depicting, dangerous marine conditions quickly developed with seas of 12-18 ft (occasionally to ~25 ft). This, combined with the prolonged NE winds, allowed tidal anomalies to rise to 2-3 feet above astronomical tides by the high tide cycle during the afternoon of 10/12, before rising further to 2.5-3.5 feet by low tide during the late evening hours. Anomalies gradually fell during the morning of the 13th as winds diminished and became N then NNW. Peak water levels occurred during the afternoon/evening of 10/12 since that was the higher of the two astronomical tides (even though anomalies were slightly higher the night of the 12th). Water levels crested at values not seen since 1/3/2022 in many spots in the lower Chesapeake Bay and on the VA/NC Atlantic coast. At Jamestown, the unofficial crest of 5.51 feet was 0.01 feet higher than what occurred during Ian (10/2022). It could be the highest crest there in nearly a decade once the data becomes official! In addition to the tidal flooding, wind gusts of 45-55 mph were observed at land sites near the coast, with the highest values observed at Elizabeth City, NC and Ocean City, MD. Rainfall from this storm was generally 1" or less and not impactful.

 

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