UW's Neal Johnson ran the numbers and found that the sea level pressure at Seattle-Tacoma Airport today was the highest since record keeping began there in 1948. Last night at midnight Sea-Tac hit 1043.4 hPa, smashing the old record of 1043.0 hPa.
- National Weather Service sea level pressure analysis : A very strong high pressure area is centered over the Northwest and southwest Canada, with pressures greater than 1040 hPa over much of the region and a 1046 hPa center over southern BC. 1046 hPa is equivalent to 30.89 inches of mercury. This is REALLY high sea level pressure. At Sea-Tac the 9 pm pressure was 1042.6 hPa - and it is still going up! There has been a huge pressure rise over the past 24h--roughly 20 hPa.
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