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Heavy Rain and Thunderstorms in the Plains; Snow in the Northern Rockies; Heavy Rain in Guam

A storm system moving over the Rockies today will bring marginal risks for excessive rainfall and severe thunderstorms from parts of New Mexico into western South Dakota. Heavy snow expected from northwestern Wyoming into southern Montana. Ongoing heavy showers and thunderstorms from Invest 96W could result in localized flash flooding, particularly in central or southern Guam early this morning. Read More >

Overview

A unique and rare weather pattern characterized by persistent low pressure over the Desert Southwest lead to multiple days of widespread heavy rain for the combined Texas and Oklahoma Panhandles. The heavy rain was mainly due to the fact that the atmosphere was relatively warm and very moist, with total atmospheric moisture above the 90th percentile to near daily max values with subtropical moisture being pumped into the area. There was also some severe weather, but hail sizes rarely were above the size of quarters and damaging wind reports were not common. The flooding reports were numerous, however. Many of the area rivers and creeks were approaching record levels, and many locations were impacts by flash flooding as well.

 

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