California Drought/Polar Vortex Jet Stream Pattern Linked to Global Warming

By: Dr. Jeff Masters, 6:56 PM GMT on April 16, 2014

From November 2013 - January 2014, a remarkably extreme jet stream pattern set up over North America, bringing the infamous "Polar Vortex" of cold air to the Midwest and Eastern U.S., and a "Ridiculously Resilient Ridge" of high pressure over California, which brought the worst winter drought conditions ever recorded to that state. A new study published this week in Geophysical Research Letters, led by Utah State scientist S.-Y. Simon Wang, found that this jet strea...

Climate Change Extreme Weather Drought

Wunderground Launches Major Site Redesign and New Logo

By: Dr. Jeff Masters, 12:13 PM GMT on April 15, 2014

Back when I helped found the world's first commercial on-line weather service--The Weather Underground--back in 1995, we adopted a simple and colorful rainbow logo that expressed our mission well: a website dedicated to unlocking and sharing vast amounts of weather data with as many people as possible using the latest digital technologies, in a way that is visually appealing and engaging. Nineteen years later, we are transitioning to a completely new logo, as part o...

Recent News

IPCC: Cost of Avoiding Dangerous Climate Change Super-Affordable if We Act Now

By: Dr. Jeff Masters, 7:10 PM GMT on April 13, 2014

Climate change is a huge threat to civilization if we do nothing more to reduce it, but the costs are very affordable if we start now, said the Nobel-prize winning Intergovernmental Panel on Climate Change (IPCC) today, in the third installment of their once-every-seven-years report on the climate. Today's report on mitigation--how we can slow down climate change--was the most hopeful of the reports, since it found that the cost of keeping global warming under the "...

Climate Change

Updated: 9:47 PM GMT on April 13, 2014

Category 4 Tropical Cyclone Ita Hits Queensland, Australia

By: Dr. Jeff Masters, 3:36 PM GMT on April 11, 2014

Category 4 Tropical Cyclone Ita powered ashore along Australia’s Queensland coast near 9 pm local time (10 UTC) on Friday with sustained winds rated at 145 mph by the Joint Typhoon Warning Center. Satellite loops show that Ita has weakened considerably since landfall, with the cloud tops in the eyewall clouds warming. Radar loops from Cairns, Australia show torrential rains from Ita are affecting a large stretch of Queensland as the storm track parallel to the coa...


Category 4 Ita Nearing Australia

By: Dr. Jeff Masters, 10:32 PM GMT on April 10, 2014

Dangerous Category 4 Tropical Cyclone Ita is nearing landfall in Australia’s Queensland state. Maximum sustained winds estimated by the Joint Typhoon Warning Center were 155 mph at 18 UTC on Thursday, just 1 mph below the threshold of Category 5 strength. The Australia’s Bureau of Meteorology estimated that Ita had a central pressure of 930 mb at 18 UTC. Satellite loops show a moderate-sized tropical cyclone surrounded by an intense eyewall with very cold cloud ...


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About JeffMasters

Jeff co-founded the Weather Underground in 1995 while working on his Ph.D. He flew with the NOAA Hurricane Hunters from 1986-1990.