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Prolonged Atmospheric River Will Impact the Northwest Early this Week

A weather system in the Pacific Northwest will produce rain throughout the day, before a potent atmospheric river produces a prolonged round of heavy rainfall, widespread urban and river flooding, and high elevation snow to the region Monday through Wednesday. Showers and thunderstorms may produce isolated damaging winds, a brief tornado, and locally heavy rainfall across parts of Florida today. Read More >

Fast Facts:

  • Shortly after 2 PM on Sunday, August 28th, strong to severe thunderstorms rolled across portions of northern Illinois. 
  • These storms were aided by a "Mesoscale Convective Vortex", which is a term referring to an area of low pressure aloft that is reinforced or augmented by earlier convection. 
  • These thunderstorms produced scattered wind damage, with somewhat more concentrated swaths of damage and heavy rainfall occurring across central DeKalb County. 
  • Storms exited the region through the mid evening hours, though another round of severe storms was experienced across part of the region the next day, Monday, August 29th. 
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Summary of severe weather and heavy rain reports
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Additional recaps can be found on the NWS Chicago Past Events Page
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