October 2020

摘要

Two hurricanes-Delta and Zeta-made landfall in the United States during October, boosting the season-to-date total to six. Only 1887, with seven hurricanes striking the mainland of the United States, featured more. Both October hurricanes hit Louisiana, with Delta moving ashore near Creole on October 9 mere miles from (and in the same parish as) where Hurricane Laura had crossed the coast just over six weeks earlier. Zeta pushed inland farther east, near Cocodrie, on October 28.Sustained winds at landfall associated with Delta were slightly lower (100 mph versus HOmph for Zeta), but Zeta was a faster-moving storm and overall delivered less rainfall. Still, the late-summer and autumn barrage of tropical activity, including Tropical Storm Beta and Hurricanes Laura, Sally, Delta, and Zeta, kept the Southeast swimming in tropical moisture.Farther north, a period of pleasant weather abruptly ended in mid-October,as a mild, dry pattern across the Plains and Midwest suddenly yielded to cold, stormy conditions. Parts of the northern Plains and upper Midwest received record amounts of October snowfall. Latemonth rain, freezing rain, sleet, and snow provided much-needed moisture across the drought-affected High Plains region.