Weather Articles

Where Did the ‘Dog Days’ of Summer Come From?

By Brian Donegan
July 20, 2017

You may be surprised how far this saying dates back.

Severe Weather Threat Persists in the Midwest After Wednesday's Derecho

By Brian Donegan
July 20, 2017

The threat isn't over yet. More severe storms will flare up through Friday.

'Ring of Fire' Weather Pattern Brings Dangerous Heat, Severe Storms and Heavy Rain

By Chris Dolce
July 20, 2017

Storms and torrid heat are in the forecast from a ring of fire weather pattern this week.

California's Detwiler Fire Destroys Dozens of Structures

By Sean Breslin
July 20, 2017

Here's what we know about a large wildfire burning near Yosemite National Park.

What America Was Like the Last Time a Major Hurricane Made Landfall in the U.S.

July 19, 2017

A lot has changed in the nearly 12 years since Hurricane Wilma hit Florida.

Tropical Storm Don to Sweep Through Windward Islands Tuesday Night With Heavy Rain, Winds; Warnings Issued

July 18, 2017

This latest tropical storm, much like Bret earlier in the season, won't last much longer.

Baby Born to Pregnant Florida Woman Struck by Lightning Dies

By Eric Chaney
July 18, 2017

A bizarre story in Florida took a tragic turn last week.

The Last Tropical Storm Don, in 2011, Was One of the Strangest Landfalls We've Ever Seen

By Jon Erdman
July 18, 2017

This one virtually evaporated. Here's why.

First Half of 2017 Was Earth's Second Hottest in 138 Years

By Chris Dolce
July 18, 2017

Only one other year has had a warmer first half than 2017.

Does an Active June and July Point to an Above-Average Atlantic Hurricane Season Overall?

By Chris Dolce
July 18, 2017

We've had a quick start to the hurricane season. Does this mean it will be busy overall?

Suburban Chicago Hospital Reopens as Illinois Floods Begin to Recede

By Sean Breslin
July 18, 2017

One Chicago-area hospital received some good news after a week of flooding.

Tropical Storm Don Isn't Named for Trump; Here's How and Why Hurricanes Are Named

July 18, 2017

A procedure that has been in place for decades to name tropical cyclones.

Massive 7.7 Magnitude Earthquake Strikes Between Russia and Alaska

By Brian Donegan
July 17, 2017

This is the second strongest earthquake of 2017.

U.S. Rep. Lamar Smith, a Well-Known Climate Skeptic, Visited Arctic on Unannounced Trip in May, Report Says

By Sean Breslin
July 17, 2017

Here's why the congressman paid the Arctic a visit.

Pattern Change This Week Will Bring Heat Relief to Northern Plains, Rockies and Heat Will Build in the Midwest, East

By Linda Lam
July 17, 2017

An upcoming pattern shift will bring weather changes to much of the U.S. this week.

Members of Extended Family Swept Away by Arizona Flood Had Gathered to Celebrate

By Eric Chaney
July 17, 2017

The victims were all members of an extended family from Phoenix and Flagstaff out to celebrate one of the deceased's birthdays.

Five Things To Look for During The Southwest Summer Monsoon

By Tom Moore
July 16, 2017

Vivid lightning, dust storms, flash flooding, higher humidity and slightly lower temperatures are all consequences of the summer monsoon in the Southwest.

Fall 2017 Temperature Outlook: Warmer Than Average For Much of U.S., Except Cool in Northwest

By Linda Lam
July 16, 2017

Which areas may see a warmer than average fall?

Heat Wave to Ease, Rain Chances Rise Next Week Over America's Worst Current Drought in Dakotas, Montana

By Jon Erdman
July 15, 2017

It's been a torrid July, but there is some hope for improvement ahead.

Watch Issued: Severe Thunderstorms, Flooding Rain a Continued East Coast Threat Friday

By Linda Lam
July 14, 2017

The severe storm beat goes on, including areas hard hit earlier this week.

Featured Blogs

Meteorology of Saturday's Colombian Flood Disaster That Killed 254

By Dr. Jeff Masters
April 3, 2017

At least 254 people were killed in the in the city of Mocoa (population 40,000) in southwest Colombia near the border of Ecuador early Saturday, when torrential rains triggered a debris flow on a nearby mountain that surged into the town as a huge wall of water carrying tons of mud and debris. The disaster is the fourth deadliest weather-related disaster in Colombia’s recorded history.

Iconic American Destination Virtually Isolated for Rest of Year

By Christopher C. Burt
March 24, 2017

Half of the village of Big Sur, on the coast of central California, has lost its only access to the north following the demolition of the flood-damaged Pfeiffer Canyon Bridge along State Route 1 (also Rt. 1 or SR 1) on March 19. Although Rt. 1 to the south of Big Sur has reopened to traffic (after mud and rock slides were cleared) it is a long 70-mile journey along the windy but spectacular highway to Cambria, the next town of any significance where supplies can be had. CalTrans (California Department of Transportation) estimates it will take 6-9 months to rebuild a new bridge over the canyon.

An extraordinary meteorological event; was one of its results a 1000-year flood?

By Stu Ostro
October 5, 2015

The confluence of meteorological ingredients the first weekend in October 2015 resulted in an extraordinary weather event with severe impacts. Was one of them a 1000-year flood?

Why the Arrest of a Science-Loving 14-year-old Matters

By Shaun Tanner
September 16, 2015

By now, many of you have heard or read about the arrest of Ahmed Mohamed, a 14-year-old high school student from Irving, Texas. Ahmed was arrested because school officials called the police after he showed one of his teachers his homemade clock. Mistaken for a bomb, Ahmed was taken into custody, interrogated, shamed, suspended (still on suspension today, Wednesday), and reprimanded. All of this after it has been found that the "device" he brought to school was indeed, a homemade clock.

2013-14 - An Interesting Winter From A to Z

By Tom Niziol
May 15, 2014

It was a very interesting winter across a good part of the nation from the Rockies through the Plains to the Northeast. Let's break down the most significant winter storms on a month by month basis.

What the 5th IPCC Assessment Doesn't Include

September 27, 2013

Melting permafrost has the potential to release an additional 1.5 trillion tons of carbon into the atmosphere, and could increase our global average temperature by 1.5°F in addition to our day-to-day human emissions. However, this effect is not included in the IPCC report issued Friday morning, which means the estimates of how Earth's climate will change are likely on the conservative side.

Recent Infographics

Storm Surge

Storm Surge terms described and defined in the Storm Surge infographic by Weather Underground.

El Niño

To understand the science behind El Niño, and the associated precipitation, checkout this infographic by Weather Underground.

Why the Sky is Blue

Finally, childhood questions answered. Find out why the sky is blue in our latest graphic.