After cost overruns and years of delay, the US is set to launch a prototype weather satellite before dawn Friday. Its data are badly needed as the number of Earth-observing satellites dwindle.
The superfunnels that hit Tuscaloosa, Ala., in late April and Joplin, Mo., on Sunday, are generated by storm systems whose journeys across the country are slowed by a roadblocked jet stream.
Two key factors that lead to flash flooding are the intensity of the rainfall and its duration.
The past two months were the warmest March and April on record globally. A new report suggests that communities will need to be adaptable to meet the challenges of global warming.
Expecting a more aggressive approach, they offer advice to the McCain and Obama campaigns.