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

Destructive Windstorm Rips across Northwest U.S.; TS Rick Forms in Northeast Pacific

By: Bob Henson and Jeff Masters, 5:55 PM GMT on November 19, 2015

One of the most widespread and damaging bouts of high wind to strike the Northwest U.S. in years tore down trees and power lines and knocked vehicles off roadways from Washington to the northern Great Plains from Tuesday into Wednesday. At one point, high wind warnings covered nearly 1 million square kilometers, or more than 10% of the contiguous United States (thanks to Stu Ostro at The Weather Channel for this tidbit). Washington governor Jay Inslee declared a sta...

Winter Weather Extreme Weather Hurricane

Updated: 7:58 PM GMT on November 19, 2015

October 2015: Earth's Warmest Month on Record by a Huge Margin

By: Jeff Masters, 4:54 PM GMT on November 18, 2015

Earth’s surface temperature has surged high into uncharted territory, thanks to a record-strength El Niño event combined with the long-term rise in temperatures due to human-caused global warming: October 2015 was Earth’s warmest month on record by a huge margin, according to data released by NOAA's National Centers for Environmental Information (NCEI) on Wednesday. October 2015 was the second consecutive month with a new all-time warmest month record: Septembe...

Climate Summaries

Updated: 4:27 PM GMT on November 19, 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

JeffMasters's Recent Photos

Cedars Plastered by Snow
Snowstorm over Dunham Lake
Beech tree fall color in the U.P.
Altocumulus clouds over Pictured Rocks National Lakeshore beaver pond