Barometric Pressure Forecast for Shepherdsville, Kentucky
Barometric pressure forecast for Shepherdsville, Kentucky — on the Salt River in Bullitt County, in the Knobs south of Louisville. See current barometric pressure and what it means for weather-sensitive people.
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Pressure and weather in Shepherdsville
Shepherdsville sits at about 450 feet on the Salt River, in the belt of steep isolated hills called the Knobs that ring the Bluegrass region and separate it from the Pennyroyal plateau to the south. The town lies in a river valley with higher ground on several sides, which matters twice over. It matters for flooding, because the Salt River has a flashy catchment that rises fast after heavy rain and has repeatedly inundated the town. And it matters for winter precipitation type, because the Ohio Valley just to the north is the most notorious corridor in the eastern United States for uncertain winter forecasts. Warm moist Gulf air riding over a shallow cold layer produces the whole menu here, rain to freezing rain to sleet to snow, sometimes within a single event and within a few miles. The barometric signature of those events is a long shallow fall of ten to fifteen hPa rather than a sharp plunge. Spring brings stronger systems with falls of twenty to twenty-six hPa, and Kentucky sits far enough east that severe storms often arrive as fast-moving squall lines late in the day. Summer brings still, heavy air and a barometer that barely registers the daily thunderstorms.
What this means for you
Ohio Valley winter systems produce long shallow declines that keep the barometer drifting for a day and a half. A barometric pressure forecast covering the whole window is more use here than a single-day figure.