I have purchased the Accu-rite home seather station (and had one replaced) with the same dramatic inaccurate barometric measurment. It always reads way low. The company emailed me to say that a 5% inaccuracey was within their acceptable range. This means an actual BP of 30.00 inches (fair weather) could read 28.5 inches on the Accu-rite insturment. 28.5 means stormy. My model is 02010.