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Forecasts come from the National Weather Service's own computer models, and current conditions from the nearest reporting weather station. Both are served through the weather API. A forecast is guidance, not a warning, and anything the Weather Service has actually issued is on the live map.
Essex sits at 44.5386°N, 73.0502°W in Chittenden County, Vermont. The forecast above is drawn for that point from the National Weather Service's own computer models: a seven-day outlook, and a finer-grained one covering the next eighteen hours where it reaches, and the radar and alert panels show what the Weather Service has out over the area right now.
Place data from the US Census Bureau. Coordinates are the Census internal point for Essex, and the forecast is for that location, not for every address inside the city limits, and a large city can have real weather differences from one side to the other.
The nearest Doppler radar is KCXX (Burlington, VT), 6.0 miles to the WSW. A WSR-88D's lowest routine scan sits half a degree above horizontal, and the earth curves away beneath it, so by the time that beam reaches Essex its centre is about 300 ft above ground. That is about as close as radar coverage gets in the United States: the lowest scan is still near the ground when it reaches Essex, so low-level rotation and the leading edge of a gust front show up on it. Essex is closer to its radar than 98% of US cities.
The closest instrument actually measuring the air is KBTV · Burlington Intl on the ASOS/AWOS network, 6.9 miles away. Near enough to be representative on most days, though a summer thunderstorm can soak one and miss the other entirely.
Beam height is the standard 4/3-earth approximation for the 0.5° scan and assumes normal refraction; it is where the centre of the beam is, not its edges, and unusual temperature profiles bend it. Radar siting from the NWS WSR-88D network, station positions from the Vermont observing network as of this build.
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