Texas and Oklahoma recorded their all-time lowest temperatures for July 15, but in parts of Alaska, the readings were warmer Monday than parts of Texas.
The sirens can be used for events other than tornadoes, including severe weather and chemical incidents.
A father tooks his 6-year-old son to Little Mates Cove on Monday, when the heat index reached 94 in Columbia.
The report, released Thursday by the Energy Department, says blackouts and other problems caused by Superstorm Sandy and other extreme weather events are likely to be repeated across the country as an aging energy infrastructure struggles to adapt to rising seas, higher storm surges and increased flooding.
The Missourian is collecting stories from people who remember what it was like in mid-Missouri 20 years ago.
The jet stream usually rushes rapidly from west to east in a mostly straight direction. But lately it's been wobbling and weaving like a drunken driver, wreaking havoc as it goes.
Hot, humid weather is forecast for the week.
The moon will loom large as it makes its closest approach to Earth this year on Saturday night and Sunday morning.
More than 7 inches of rain fell in Springfield on Saturday. The National Weather Service said a flash flood warning was in effect until later Saturday evening for north-central Christian County and southeastern Greene County.
The storm caused widespread power outages, flash flooding and extensive flight delays but largely failed to live up to its fierce billing. The severe weather was also blamed for two deaths.
The National Weather Service said the river had crested in the St. Louis area and the Illinois towns of Grafton and Alton farther north.
Friday's tornado was initially rated as an EF3. But the agency upgraded that ranking after surveying damage and concluding that the storm had winds of 295 mph.
The rain finally cleared out by Saturday morning.
Missourian readers have been sending us their views of rain and flooding in Columbia.
A record of 2.51 inches of rain has exceeded the previous record of 1.57 inches in 1969. More rainfall expected Friday afternoon and evening could push the total higher.
Fire Department warns against trying to cross flooded roads.
Residents enjoyed temperatures in the high 80s on Tuesday.
Balmy, seasonal temperatures Tuesday provided a respite from what's been an unpredictable spring in Columbia.
The National Weather Service has issued a winter weather advisory for western Missouri with the possibility for some sleet and snow early Friday in the Columbia area.
Missouri weather is so unpredictable that different weather models could show different projections, and city governments don't know which ones to use.