Sebastian Harkema
@wxsharkema.bsky.social
Atmospheric Science | PhD UAH '23 | M.S. UAH '19 | B.S. CMU '17 | Opinions are my own
Northern lights visible in Huntsville, AL!
November 12, 2025 at 2:42 AM
Northern lights visible in Huntsville, AL!
Reposted by Sebastian Harkema
A spectacular "cold wake" is evident along former-hurricane Erin's track. This is a normal feature caused by strong winds upwelling/mixing cooler water from below. Erin was not only very intense but also very large, which also helps with the upwelling. The water temperatures will gradually recover.
August 26, 2025 at 12:32 PM
A spectacular "cold wake" is evident along former-hurricane Erin's track. This is a normal feature caused by strong winds upwelling/mixing cooler water from below. Erin was not only very intense but also very large, which also helps with the upwelling. The water temperatures will gradually recover.
Welp, I just taught my first class ever! I'm excited to teach undergraduate and graduate students about natural hazards and their societal impacts.Thank goodness, it was syllabus day because I finished the class 40 minutes early. Here's to a good semester.
August 21, 2025 at 11:23 PM
Welp, I just taught my first class ever! I'm excited to teach undergraduate and graduate students about natural hazards and their societal impacts.Thank goodness, it was syllabus day because I finished the class 40 minutes early. Here's to a good semester.
Reposted by Sebastian Harkema
July 23, 2025 at 12:46 PM
I'm pretty sure I just saw a plane get struck my lighting taking off from Huntsville International Airport.
May 20, 2025 at 11:02 PM
I'm pretty sure I just saw a plane get struck my lighting taking off from Huntsville International Airport.
While many people were watching the snow accumulating, the Geostationary Lightning Mapper was busy observing #thundesnow. This is just a friendly reminder that #thundersnow is much more common than you think. 🧪
January 6, 2025 at 9:56 PM
While many people were watching the snow accumulating, the Geostationary Lightning Mapper was busy observing #thundesnow. This is just a friendly reminder that #thundersnow is much more common than you think. 🧪
Now that's a lot of #thundersnow from 5 December 2024. I've had family/friends in Michigan reach out to me and say they thought they saw/heard it 🧪
December 6, 2024 at 5:21 PM
Now that's a lot of #thundersnow from 5 December 2024. I've had family/friends in Michigan reach out to me and say they thought they saw/heard it 🧪
Reposted by Sebastian Harkema
So if the Department of Education is scrapped with the next admin, does that mean student loans are also scrapped? I'm asking for 40+ million friends...
December 4, 2024 at 12:54 AM
So if the Department of Education is scrapped with the next admin, does that mean student loans are also scrapped? I'm asking for 40+ million friends...
The Great Lakes and Northeast regions have been experiencing a plethora of #thundersnow flashes and lake-effect snow. This is caused by cold arctic air moving over the relatively warm waters of the Great Lakes, as shown by the NASA SPoRT SST product. 🧪
November 30, 2024 at 7:03 PM
The Great Lakes and Northeast regions have been experiencing a plethora of #thundersnow flashes and lake-effect snow. This is caused by cold arctic air moving over the relatively warm waters of the Great Lakes, as shown by the NASA SPoRT SST product. 🧪
Thanks for the validation data point! @wxkaitlynj.bsky.social
November 22, 2024 at 12:37 PM
Thanks for the validation data point! @wxkaitlynj.bsky.social
No thundersnow was observed yesterday. However, all the snowfall images on here have brought me a lot of joy!
November 21, 2024 at 10:37 PM
No thundersnow was observed yesterday. However, all the snowfall images on here have brought me a lot of joy!
November 16, 2024 at 11:38 PM
Post a picture you took (no description) to bring some zen to the timeline.
November 16, 2024 at 8:52 PM
Post a picture you took (no description) to bring some zen to the timeline.
Welcome to Bluesky! #LGRW
November 16, 2024 at 1:04 AM
Welcome to Bluesky! #LGRW
Daily thundersnow summary for 13 November 2024. It looks like Colorado was the winner. 🧪
November 14, 2024 at 10:56 PM
Daily thundersnow summary for 13 November 2024. It looks like Colorado was the winner. 🧪
Reposted by Sebastian Harkema
Apollo 12 is one of the reasons we have the lightning detection capabilities we do.
After the rocket was struck and "Flight, try SCE to AUX", a lot of research was focused on forecasting and detecting lightning.
Now we detect more than 2 billion lightning events around the world each year. 🧪
After the rocket was struck and "Flight, try SCE to AUX", a lot of research was focused on forecasting and detecting lightning.
Now we detect more than 2 billion lightning events around the world each year. 🧪
November 14, 2024 at 2:15 PM
Apollo 12 is one of the reasons we have the lightning detection capabilities we do.
After the rocket was struck and "Flight, try SCE to AUX", a lot of research was focused on forecasting and detecting lightning.
Now we detect more than 2 billion lightning events around the world each year. 🧪
After the rocket was struck and "Flight, try SCE to AUX", a lot of research was focused on forecasting and detecting lightning.
Now we detect more than 2 billion lightning events around the world each year. 🧪
Thundersnow flashes that GLM-East observed on 12 November 2024. These flashes were classified by an algorithm that I developed as part of my masters thesis (6 years ago). Going forward, I'll be posting daily summary maps similar to this.
November 13, 2024 at 9:37 PM
Thundersnow flashes that GLM-East observed on 12 November 2024. These flashes were classified by an algorithm that I developed as part of my masters thesis (6 years ago). Going forward, I'll be posting daily summary maps similar to this.
It's 6:45a, and my polling place has a line halfway around the building already. I've never seen anything like this before in Huntsville, AL! #YourVoteMatters
November 5, 2024 at 12:45 PM
It's 6:45a, and my polling place has a line halfway around the building already. I've never seen anything like this before in Huntsville, AL! #YourVoteMatters
My thoughts on the Lions/Packers game so far: What if this rain was snow instead?
November 3, 2024 at 10:42 PM
My thoughts on the Lions/Packers game so far: What if this rain was snow instead?
Some things can beat it, but updated code working flawlessly the first time is pretty high up on my feels good list.
October 23, 2024 at 10:33 PM
Some things can beat it, but updated code working flawlessly the first time is pretty high up on my feels good list.