An Unprecedented Thanksgiving Visitor: a Category 4 Hurricane

By: Jeff Masters and Bob Henson, 4:18 PM GMT on November 26, 2015

Remarkable Hurricane Sandra exploded into a Category 4 storm with 145 mph winds overnight, making it the latest major hurricane ever observed in the Western Hemisphere (November 26.) The previous record was held by an unnamed Atlantic hurricane in 1934 that held on to Category 3 status until 00 UTC November 24. Sandra is also now the latest Category 4 storm ever observed in either the Eastern Pacific (previous record: Hurricane Kenneth on November 22, 2011) or the A...


Unseasonable Sandra: Hurricane Threat for Mexico, Torrential Rain in Southern Plains

By: Bob Henson and Jeff Masters, 5:51 PM GMT on November 25, 2015

Holiday travel during the busy Saturday/Sunday Thanksgiving weekend across portions of the Southern Plains will get disrupted by a most unusual occurrence--flooding rains and a potential ice storm, enhanced by moisture from the strongest Eastern Pacific hurricane observed so late in the year. Declared a hurricane on Tuesday night, fast-strengthening Sandra is already making East Pacific history about 700 miles south of Cabo San Lucas. Sandra reached Category 2 stren...

Hurricane Winter Weather Flood

Updated: 3:32 PM GMT on November 26, 2015

Late-Season Tropical Storm Sandra Could Strike Mexico and Drench Texas

By: Jeff Masters and Bob Henson, 4:05 PM GMT on November 24, 2015

Tropical Storm Sandra formed on Tuesday morning in the record-warm Pacific waters off the south coast of Mexico, about 570 miles south of Manzanillo. Sandra joins last week's Tropical Storm Rick as one of the latest-forming tropical storms in the history of the Eastern Pacific. Since accurate records began in 1949 (with higher-quality satellite records beginning in 1971), the Eastern Pacific has seen only six tropical storms form after November 18: December 5, 1983 ...

Hurricane Extreme Weather Winter Weather

Eastern Pacific's Invest 91E A Threat to Mexico

By: Jeff Masters and Bob Henson, 5:22 PM GMT on November 23, 2015

An area of disturbed weather (Invest 91E) is approaching tropical depression status in the record-warm Pacific waters off the south coast of Mexico, about 425 miles south of Acapulco. Satellite images on Monday morning showed that 91E had a large and expanding area of heavy thunderstorms with a pronounced rotation. The 7 am EST Monday run of the SHIPS model predicted that 91E would be over record-warm ocean waters near 30°C (86°F) and under light wind shear around...

Hurricane Extreme Weather El Niño

Updated: 3:10 PM GMT on November 24, 2015

Carbon Dioxide Bidding Farewell to 400-ppm Benchmark

By: Bob Henson, 5:18 PM GMT on November 20, 2015

On an otherwise unremarkable day last week--November 11, 2015 (noted mainly for being Veterans Day in the U.S.)--a crucial milestone in global climate was quietly transcended. The daily average concentration of carbon dioxide in the air that day at Hawaii’s Mauna Loa Observatory was 399.68 parts per million. On November 12 it rose to 401.64 ppm, and it’s quite possible that we’ll never see another day in our lives with the daily Mauna Loa CO2 reading below 400...

Climate Change Politics Climate Change

Updated: 6:51 PM GMT on November 20, 2015

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Dr. Jeff Masters' WunderBlog


Dr. Masters co-founded wunderground in 1995. He flew with the NOAA Hurricane Hunters from 1986-1990. Co-blogging with him: Bob Henson, @bhensonweather

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