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Capital Weather Gang Profile picture
@capitalweather
May 22, 2020 • 3 tweets • 3 min read • Read on X
Remarkable before and after scenes from satellite imagery from #MidlandMichigan flood/dam disaster.

This animation from @NASAEarth...

More scenes: wapo.st/2A5zgK3 1/
The before and after scene below, from @Maxar, shows the radical change at the #EdenvilleDam after it collapsed... 2/
This is what the #SanfordDam looked like before and during the time is was overrun by floodwaters... (This dam, while overwhelmed, did not actually fail). Image: @Maxar 3/3

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More from @capitalweather

Capital Weather Gang Profile picture
Nov 13
New today: Capital Weather Gang's winter outlook. We lean toward slightly below normal snow this winter in DC but more than we've seen in the last several winters -- which have produced very low numbers. 1/x Image
The main reason most winter outlooks are calling for below normal snow for the DC area is because of La Nina, which -- on average -- brings below normal amounts. But this La Nina will probably be weak, if it develops at all. We think its influence may be limited. 2/x Image
That said, we'd be surprised if this is a banner year for snow lovers and think the prevailing storm track will be west of DC, meaning storms may start as snow or ice but flip to rain. 3/x Image
Read 4 tweets
Capital Weather Gang Profile picture
Sep 1
Maps, we love maps. They help tell the story of the summer.

First, here are all of the locations which had one of their top 5 hottest summers - June thru Aug - on record. DC is among them.

1/5 Image
Here all the places that highs of 100+ and the number of times. Some places in the Southwest like Phoenix and Yuma were 100+ pretty much every day.

2/5 Image
Over 250 places with at least 20 years of data set all-time highs during summer. They include Las Vegas; Fresno; Abilene, Tex.; Raleigh; Hagerstown, Md; and Caribou, Maine.

3/5 Image
Read 5 tweets
Capital Weather Gang Profile picture
May 13
Crazy -- and not in a good way -- wildfires in Canada have erupted (fueled by warm, very dry conditions) -- just like they did at this time last year, and sending smoke into the Upper Midwest, where air quality is tanking. 1/4 Image
Code red air quality -- signifying unhealthy levels of smoke pollution -- in Minnesota and Wisconsin this morning. Parts of southwest Canada have seen Code Purple air quality-- the worst level. 2/4 Image
The fires are spreading fast because of widespread drought in Canada. Also, of note, even worse drought and record heat in Mexico are causing fires to spread and smoke is infiltrating the U.S. from the south, too!!! 3/4 Image
Read 4 tweets
Capital Weather Gang Profile picture
Aug 7, 2023
⚠️DC area: We expect intense storms that could produce damaging or destructive winds -- especially in 5-7p window in immediate area.

Our detailed brief is up. Read it and share it:


Will thread some key points... 1/xwashingtonpost.com/weather/2023/0…
We are under a level 4 out of 5 risk. The last time that happened locally was June 13, 2013; the previous time before that was the June 29, 2012 derecho. So the @NWSSPC sees ingredients in place for numerous dangerous storms in the area.

2/x Image
@NWSSPC We're most concerned about:
1) Downburst winds -- like we saw July 29 this year. @NWSPC sees 45% chance of winds over 58 mph within 25 miles of any point in our area & 10% chance of 75+ mph
2) Quick-hitting tornadoes -- a lower chance than downburst winds but possible

3/x Image
Read 5 tweets
Capital Weather Gang Profile picture
Jun 23, 2023
Communities are taking part in a radical revolution — of our lightbulbs. Bulbs are being swapped for more energy-efficient brighter LED lights.

But the rise of LEDs creates new issues for our night sky & health.

By @KashaPatel, @sadbumblebee, @kt_prry: wapo.st/3r3mNB3
Common types of LED lights emit more blue light than traditional high-pressure sodium bulbs. Differences are seen in this 2020 image from the Space Station. Bluer LEDs appear in Baltimore, while older amber-colored lights spread across D.C.

More: https://t.co/7TyF7WcYnCwapo.st/3r3mNB3
The blue light in LEDs can lead to more light pollution. In Chelan County in Wash, pollution grew worse after streetlights were replaced w/LEDs. Additional glare masked about half the previously visible stars:

📷@PostGraphics w/National Park Service data https://t.co/xtVNOw2KlCwapo.st/3r3mNB3
Read 5 tweets
Capital Weather Gang Profile picture
Jun 12, 2023
This wildfire season in Canada is unlike anything it's ever seen to date. And part of a trend toward larger fires & more damaging fire seasons.

4.7 million hectares have burned; average year to date is 310,000.

Carbon emissions from fires through the roof

(1/5) Image
The land area burned so far in Canada has exceeded 5,000 percent of normal in some provinces. (2/5) Image
Some climate skeptics - to dismiss this year's fire activity - have pointed to decrease in number of fires in Canada over time. That is true, but prob b/c of improved prevention.

BUT, fires that burn have trended substantially BIGGER while summer temps have trended higher. (3/5) Image
Read 6 tweets

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