Lightnews — Scholar-powered news

Kaitlyn Jesmonth @wxkaitlynj.bsky.social · 2d

This may be one of the first true tests of the Euro AIFS with a warm-core Nor’easter.

Interestingly, the latest 12z run of the deterministic Euro is very different than the AI version. With such a complex meteorology setup it will be interesting to see how this pans out.

3

Reposted by Kaitlyn Jesmonth

National Weather Service @nws.noaa.gov · 2d

Read the latest key messages regarding the development of a strong coastal low this weekend. Significant coastal impacts are expected along much of the U.S. East Coast through early next week.

Find your local forecast office to keep up with the latest at weather.gov.

Graphic relaying the Key Messages for a forecast strong coastal low expected along the east coast this weekend.
- A coastal low is expected to develop off the coast of the Southeast US early Saturday and strengthen through the weekend, bringing significant coastal impacts to parts of the US East Coast through early next week.
- The combination of persistent, strong onshore winds, high surf, and high astronomical tides may lead to major coastal flooding for some Mid-Atlantic communities. Coastal residents are urged to heed warnings for their local National Weather Service office and always follow guidance from local officials.
- High surf is expected on many East Coast beaches, which will generate strong rip currents and likely lead to areas of beach erosion.
- There is an increasing threat of wind gusts in excess of 55mph and periods of heavy rain for coastal areas of the Mid-Atlantic. This may lead to scattered power outages and isolated to scattered instances of flash flooding.

1 16 58

Kaitlyn Jesmonth @wxkaitlynj.bsky.social · 2d

October 🤝 warm-core Nor’easters

2 8

Kaitlyn Jesmonth @wxkaitlynj.bsky.social · 6d

Ah that time of year when you can see lake-effect snow 300+ hours on the GFS is back 🙌

1 7

Kaitlyn Jesmonth @wxkaitlynj.bsky.social · 18d

Finally some persistent rain last night in Champaign-Urbana but how much rain fell really depended on what side of town you’re on.

Almost an inch less of rain in Champaign compared to Urbana. Some of those localized downpours didn’t quite make it west. #ilwx #cocorahs

1

Reposted by Kaitlyn Jesmonth

CliMAS Illinois @climasillinois.bsky.social · Aug 28

Greetings from the CliMAS Fall 2025 Welcome BBQ!

3 13

Kaitlyn Jesmonth @wxkaitlynj.bsky.social · Aug 26

Not pictured: @70dbz.bsky.social in a Buffalo Bills grilling outfit at today’s welcome back cookout 😅😂

1 3

Kaitlyn Jesmonth @wxkaitlynj.bsky.social · Aug 26

And we’re back! Day 1 of PhD classes ✅

Ready to start this journey and all that’s to come!

2 7

Kaitlyn Jesmonth @wxkaitlynj.bsky.social · Aug 17

@ztresearch.bsky.social this was another neat one last night!

Kaitlyn Jesmonth @wxkaitlynj.bsky.social · Aug 17

More footage of the incredible lightning in Champaign last night. This is in slow motion.

Lasted like this for almost a full hour after the passage of a line of thunderstorms!! #ilwx

1 6 28

Kaitlyn Jesmonth @wxkaitlynj.bsky.social · Aug 17

I definitely wish I had some long exposure stills but yeah the video is tough to beat!!

1

Kaitlyn Jesmonth @wxkaitlynj.bsky.social · Aug 17

It is just an iPhone believe it or not! If you shoot in slo mo it’s a higher frames per second which helps

1 1

Kaitlyn Jesmonth @wxkaitlynj.bsky.social · Aug 17

Thanks for breaking this down!!

Reposted by Kaitlyn Jesmonth

@ztresearch.bsky.social @ztresearch.bsky.social · Aug 17

Incredible +CG flash!! Negative leaders propagate right to left incloud, then a positive leader develops downward from the decaying negative leader causing a +CG return stroke. Positive leaders with recoil leaders visible below cloud base following the return stroke.

Kaitlyn Jesmonth @wxkaitlynj.bsky.social · Aug 17

Tonight featured some of the most incredible lightning I’ve ever captured. Taken from Champaign, IL after thunderstorms departed the area!!⚡️ #ilwx @deeplycloudy.bsky.social @stephanieway.bsky.social @frqltg.bsky.social

1 1 6

Kaitlyn Jesmonth @wxkaitlynj.bsky.social · Aug 17

Tonight featured some of the most incredible lightning I’ve ever captured. Taken from Champaign, IL after thunderstorms departed the area!!⚡️ #ilwx @deeplycloudy.bsky.social @stephanieway.bsky.social @frqltg.bsky.social

3 5 56

Kaitlyn Jesmonth @wxkaitlynj.bsky.social · Jul 9

Anvil crawler lightning looking north in Niantic, CT this evening!! ⛈️ #ctwx

1 9

Kaitlyn Jesmonth @wxkaitlynj.bsky.social · Jul 8

This tornado is a head scratcher for us meteorologists. It occurred in an environment that would not signal for a widespread tornado threat. Rather it spun up quickly near a localized lake breeze front + perhaps outflow boundary from storms to the east too. Shows how nuanced this field can be!!

4

Kaitlyn Jesmonth @wxkaitlynj.bsky.social · Jul 8

EF-2 tornado confirmed in the Finger Lakes Region of New York yesterday.

Very glad no one was injured here. This storm popped up so quickly and in an area of poor radar coverage! #nywx

1 3

Kaitlyn Jesmonth @wxkaitlynj.bsky.social · Jul 4

Trace of snow officially goes down in the climate report for Binghamton, NY today from hail accumulation #nywx

Alerts from NWS Binghamton NY (UNOFFICIAL) @bgm.nws-bot.us · Jul 4

BINGHAMTON NY Jul 3
Climate Report:
High: 78
Low: 52
Precip: 0.65"
Snow: Trace Snow Depth: 0"
at Fri, 04 Jul 2025 01:33:22 +0000 via IEMbot
Additional Details Here.

4

Kaitlyn Jesmonth @wxkaitlynj.bsky.social · Jun 28

🥹🥹 thanks stephanie!!

1

Kaitlyn Jesmonth @wxkaitlynj.bsky.social · Jun 28

thanks so much!!

2

Kaitlyn Jesmonth @wxkaitlynj.bsky.social · Jun 28

Honored to have won a student oral presentation award! Thanks #AMS21Meso for a great conference

2 17

Reposted by Kaitlyn Jesmonth

American Meteorological Society @ametsoc.org · Jun 26

Join the Committee on Weather Analysis and Forecasting for a free webinar that highlights the important work that NOAA meteorologists throughout the agency do to keep the public safe during severe weather events.

Register here: bit.ly/43RIUvq

Graphic for the "Weathering the Storm: How NOAA Forecasters Collaborate and Communicate During Severe Weather Events" webinar on 17 July 2025 at 2:00 PM ET.

14 22

Kaitlyn Jesmonth @wxkaitlynj.bsky.social · Jun 26

No worries! Looking forward to hearing more in the future. Thanks again!!

5

Kaitlyn Jesmonth @wxkaitlynj.bsky.social · Jun 26

Hi Clark, thanks for all of this info! I’m curious about winter applications as well. Particularly the NAM does quite well with p-type issues in winter storms. The 3km NAM in particular is quite useful for lake-effect snowband placement too. Are there any resources or more info about this? Thanks!

1 5