Respond to prefers-color-scheme dark in app web views

Follow section front redirects in Spectrum

Enable NLP source in PCS for load testing

Switch off the News Alerts Survey Widget when we have enough responses

Poll to determine if new LUF updates are available

Allows the winning A/B test variant to be turned on without Spectrum deployment

Show infinite scrolling sections in Assembler MultiView

Show option for NLP article summaries in Action Bar

A general feature flag for Recipe Features that aren't yet released

Feature flag for media team features that aren't yet released

Use new Orca video player for preroll plugin in Spectrum

Show the snow tracker (instead of the heat tracker) on Spectrum

In a pinch, the Nationals finally find some offense

Is Pastis as good as our food critic thought? He sent spies to find out.

The Capitals, a team in transition, know what they want this offseason

The New York Times, alone in its outrage over access to Biden

The ‘Access Hollywood’ video cemented Trump’s air of invincibility

Stephen A. Smith would like even more of your attention

Trump Media auditor charged by SEC with ‘massive fraud’

Google’s empire is massive. A judge will soon rule if it’s a monopoly.

Five tech products we actually like

The new cure-all for vacation excess: the IV drip 

What’s the best bus to New York? We tested 5 for comfort and value.

Adaptive equipment is making national parks more inclusive

Strangers help Sesame Street puppeteer after heirloom necklace was stolen

Teen grabs wheel when driver passes out and school bus veers into traffic

Cat climbed into Amazon return box, found alive 630 miles away

Confident of victory over Ukraine, Russia exhibits Western war trophies

Two women are seeking Mexico’s presidency. But the race is about a man.

Hamas in Cairo for hostage talks as Israel briefs aid agencies on Rafah

Ask Amy: My boyfriend just confessed he’s almost $20,000 in debt

Miss Manners: Is it inappropriate to reach out to old girlfriends?

Carolyn Hax: Longtime friend won’t forgive being last-minute canceled for a guy

Biden confronts campus protests; Trump hedges on accepting election results

Kristi Noem just won’t stop talking about killing her dog

Noem’s dog-killing isn’t popular, though Trump supporters are divided

The Post endorses April McClain Delaney and Tom Royals for Maryland’s 6th District

On Press Freedom Day, little to celebrate for Hong Kong’s journalists

Young Georgians want to be part of Europe. Their government is in the way.

In photos: At least 39 dead as historic flooding hits southern Brazil

Sea level rise brings new era of dangerous flooding

Michael Cohen keeps broadcasting despite being a witness

Kristy Pottol

Magnificent clouds resembling ocean waves in the sky towered over mountain ridge tops over Interstate 70 in Maryland on a clear Sunday morning.

Capital Weather Gang reader Kristy Pottol said she photographed the clouds between Middletown and Hagerstown in west-central Maryland.

The rare clouds, formed by a phenomenon known as Kelvin-Helmholtz instability, occur as a result of differences in air density in adjacent layers of the sky.

They’re seen much more frequently in the Western United States — especially in environments characterized by strong winds aloft and rising channels of instability off the ground. As the instability channel ascends, it is pushed over by the strong winds above, spinning up eddies.

In this case, the Catoctin Mountains helped force air flowing in from the west to rise through a process known as orographic lift. Some pockets of instability developed as the sun heated the ground and rose into colder air aloft.

<a href="https://www.spc.noaa.gov/exper/soundings/24030312_OBS/" target=_blank>Weather balloon data</a> from Dulles International Airport on Sunday morning presented a textbook setup for these clouds. It revealed:

An unstable layer just above the ground — encouraging the air to rise and condense into clouds.

Strong westerly winds about a mile high over top the mountains where the clouds ascended.

A stable layer just above the clouds, which caused the forming wave cloud to collapse, much like an ocean wave crashing into the shore.

<a href="https://www.washingtonpost.com/weather/2022/12/08/kelvin-helmholtz-wave-clouds-wyoming/" target=_blank>Gorgeous examples</a> of these wave clouds were photographed in Wyoming’s Bighorn mountains in December 2022, and in Breckenridge, Colo., <a href="https://www.washingtonpost.com/news/capital-weather-gang/wp/2015/11/03/pic-of-the-week-surfs-up-for-snow-lovers-incomparable-kelvin-helmholtz-clouds-in-breckenridge/?itid=lk_inline_manual_20" target=_blank>in 2015</a>.

<b>Read more about Kelvin-Helmholtz wave clouds</b>

<a href="https://www.washingtonpost.com/news/capital-weather-gang/wp/2015/11/03/pic-of-the-week-surfs-up-for-snow-lovers-incomparable-kelvin-helmholtz-clouds-in-breckenridge/?itid=lk_inline_manual_22" target=_blank>Surf’s up for snow lovers, incomparable Kelvin Helmholtz clouds in Breckenridge</a>

<a href="https://www.washingtonpost.com/news/capital-weather-gang/wp/2015/07/28/shark-fins-in-the-sky-awesome-kelvin-helmholtz-clouds-from-the-galapagos/?itid=lk_inline_manual_20&itid=lk_inline_manual_23" target=_blank>Shark fins in the sky: Awesome Kelvin-Helmholtz clouds from the Galapagos</a>

<a href="http://www.washingtonpost.com/blogs/capital-weather-gang/wp/2014/10/24/radical-kelvin-helmholtz-wave-clouds-in-the-rockies/?itid=lk_inline_manual_21&itid=lk_inline_manual_24" target=_blank>Radical Kelvin Helmholtz wave clouds in the Rockies</a>

<a href="http://www.washingtonpost.com/blogs/capital-weather-gang/wp/2014/03/13/magnificent-example-of-the-mystical-kelvin-helmholtz-instability-from-lake-tahoe-region/?itid=lk_inline_manual_22&itid=lk_inline_manual_25" target=_blank>Magnificent example of Kelvin-Helmholtz instability from Lake Tahoe region</a>

<a href="http://www.washingtonpost.com/blogs/capital-weather-gang/wp/2013/08/22/clouds-the-weirdest-of-the-weird/?itid=lk_inline_manual_23&itid=lk_inline_manual_26" target=_blank>Clouds: The weirdest of the weird</a>

National Weather Association, Digital Seal of Approval

University of Virginia, BA in environmental science, 1998

University of Wisconsin, MS in atmospheric science, 2000

Jason Samenow is The Washington Post’s weather editor and Capital Weather Gang's chief meteorologist. He earned a master's degree in atmospheric science and spent 10 years as a climate change science analyst for the U.S. government. He holds the Digital Seal of Approval from the National Weather Association.

Jason Samenow

Ian Livingston is a forecaster/photographer and information lead for the Capital Weather Gang. By day, Ian is a defense and national security researcher at a D.C. think tank.

Ian Livingston

the-washington-post

handout

Climate

Weather

Environment

Climate Lab

Capital Weather Gang

washpost

prism://prism.query/site,/local/weather&limit=15

The inside scoop on weather in the D.C. area and beyond.

Fast, informative and written just for locals. Get The 7 DMV newsletter in your inbox every weekday morning.

D.C., Md. & Va.

The Washington Post offers breaking local news, weather and traffic information for the DC, Maryland and Virginia metro areas, plus information about school districts, crime, government, religion, the lottery,restaurant reviews and obituaries.

Average Year-To-Date	1
Yearly Average	40
Record Most	67 (1980,2010)
Record Fewest	7 (1886,1905)
Last Year	38