it s the top of the hour on cnn newsroom. i m alisyn camerota. i m victor blackwell. good to be with you. more than 8,000 flights have been delayed just today after the faa made a rare move in the ground of safety. they grounded flights to work out major flights in a messaging system. pilots use this system to learn about safety hazards in realtime. somewhere overnight, there was an issue with irregularities in the messages that were going out that reflected a bigger systems issue, and this morning at about 7:00, there were still problems validating that the messages were going out. so for safety reasons to make sure that every aircraft that took off was doing so safely, faa implemented a ground stop. secretary buttigieg said it s still not clear what caused this system failure, but it does not appear to be a cyberattack. what is clear is the ripple effect for thousands of passengers so let s bring in cnn s adrienne broaddus. what are passengers telling you, adrienne?
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mountainsides. it dumps the heavy sierra cement snow that can lead to avalanches and power lines down. it s just a nightmare out there, and it s interesting. i don t know if we have the nasa animation. you can see how much the soil moisture has changed. this was in november just a few months ago, and watch as the entire state turns blue in just a couple of weeks. if only we had superman to come take this atmospheric river and funnel it into lake powell and lake maead to use that water. such a dramatic change when you watch this map switch to blue there. climate change, the influence on what we re seeing? reporter: hotter planet means more moisture, and throwing off the water cycles in ways that even the most extreme predictions were conservative it turns out in hindsight. the droughts get longer and hotter. the wet monsoon rains will get