Tropical Storm Kirk formed on Saturday, Sept. 22. By Monday, Sept. 24, Kirk lacked the closed circulation that is a prerequisite for tropical cyclone status.  The NOAA-20 satellite provided a visible image of the storm at its peak.

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America’s national parks are warming up and drying out much faster than the rest of the United States, according to a new study on the impacts of climate change on U.S. parks published in the journal Environmental Research Letters. The changing conditions are threatening protected ecosystems from the Everglades in Florida to Denali National Park in Alaska.

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For angiosperms — or flowering plants — one of the most important decisions facing them each year is when to flower. It is no trivial undertaking. To flower, they must cease vegetative growth and commit to making those energetically expensive reproductive structures that will bring about the next generation.

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