Clark Evans
@clarkevanswx.bsky.social
1.7K followers 480 following 460 posts
I study high-impact weather, help develop high-resolution models to improve weather forecasts, and mentor scientists. Constantly striving to help those around me flourish. My views expressed here are mine alone.
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clarkevanswx.bsky.social
None of NOAA’s line offices work in isolation. At GSL, we’re proud to engage with our NWS colleagues on testing and evaluating the modeling system and service innovations — which we then use to make them better before reaching operations! Here’s how we’re doing so now:

gsl.noaa.gov/news/noaa-te...
NOAA Testbeds help GSL advance forecast and weather information systems| NOAA OAR GSL
Global Systems Laboratory
gsl.noaa.gov
clarkevanswx.bsky.social
And speaking of catalysts and storms named Philippe - 2005’s annihilation of Philippe by an upper-level low spurred by Rita’s outflow fascinated me and helped foster a long-lasting interest in how TCs modify their environments and sometimes indirectly interact with each other.
NOAA GIBBS GOES-12 water vapor image from September 19, 2005 at 2345 UTC. Hurricane Rita is near the Bahamas at left-center while Philippe is to its east-southeast and east of the Lesser Antilles.
clarkevanswx.bsky.social
In many ways, the 1995 hurricane season was the catalyst for my interest in tropical cyclones. The swallowing of Karen by Iris definitely contributed to that interest. Here's an archived GOES-8 image about a day before Iris swallowed Karen. The two TCs are east-southeast of Bermuda at this time.
NOAA GIBBS archived GOES-8 IR satellite image, September 2, 1995 at 0645 UTC. Hurricane Iris and Tropical Storm Karen are located east of Bermuda.
clarkevanswx.bsky.social
As we go off into the great unknown, the atmosphere was kind enough to provide a moment of zen. Be well, friends.
clarkevanswx.bsky.social
The Univ. of Nebraska’s Dept. of Earth and Atmospheric Sciences has established a webpage soliciting the community’s help in saving their program. Their hearing in front of campus admin is next Friday, Oct 10th. Please consider sharing why they’re essential!

eas.unl.edu/save-earth-a...
Save Earth and Atmospheric Sciences! | Department of Earth and Atmospheric Sciences | Nebraska
The University of Nebraska-Lincoln is proposing to close the Department of Earth & Atmospheric Sciences (EAS) as part of its budget reduction plan. We strongly oppose this plan. EAS conducts research ...
eas.unl.edu
clarkevanswx.bsky.social
None of NOAA’s line offices work in isolation. At GSL, we’re proud to engage with our NWS colleagues on testing and evaluating the modeling system and service innovations — which we then use to make them better before reaching operations! Here’s how we’re doing so now:

gsl.noaa.gov/news/noaa-te...
NOAA Testbeds help GSL advance forecast and weather information systems| NOAA OAR GSL
Global Systems Laboratory
gsl.noaa.gov
clarkevanswx.bsky.social
Yes! You can reprocess the data to obtain the updated temperature traces; we did that for data from 2023-24 without issue.
clarkevanswx.bsky.social
You should be able to see the radiation correction algorithm’s version number in the text output files — 3.5.3 or later should have the improved version. Unfortunately, I don’t have the full software available to me at the moment to check the full application version.
clarkevanswx.bsky.social
What version of Windsond’s radiation correction algorithm are you all using? All but the latest release result in a warm bias - strongest under full sun, but non-zero even in mostly cloudy conditions - due to insufficient radiation correction. That could explain the T differences you see.
clarkevanswx.bsky.social
👋 from a soggy Boulder!
Reposted by Clark Evans
mountsthelens1980.bsky.social
#MSH45 | May 18, 1980 — 8:32 a.m.
Geologists Dorothy and Keith Stoffel, with pilot Bruce Judson, make a final pass over Mount St. Helens. A M5.1 quake strikes. Ice and rock collapse into the crater.

Below them, the north face heaves—then gives way. The largest landslide in recorded history begins.
clarkevanswx.bsky.social
My friend and former colleague at UWM, Sergey Kravtsov, is looking to hire *two* postdoctoral fellows, one in climate dynamics and the other in data-driven modeling for global precipitation. Please see the advertisements below for more details and share with your networks!
The School of Freshwater Sciences at the University of Wisconsin-Milwaukee invites
applications for a Postdoctoral Associate position in the area of climate science. The
successful candidate will use idealized numerical simulations to study the multi-scale
climate dynamics in the Southern Ocean region. The appointment is full-time, available
starting November 1, 2025, and is for an initial period of one year, with potential renewal
based on performance and funding.
The Postdoctoral Associate is expected to: (i) run numerical simulations of the Southern
Ocean’s coupled climate system using the Moist Quasi-Geostrophic Model version 2.0
(MQ-GCM2.0); (ii) develop modifications to MQ-GCM2.0 to best match the parallel state-
of-the-art model experiments and observations over the region of interest; (iii) analyze
model output and use the so-called interactive ensemble technique to understand the
underlying dynamics; (iv) collaborate closely with other team members; and (v) publish
findings in peer-reviewed journals and present results at scientific conferences.
Candidates should hold a Ph.D. in Atmospheric Science, Physical Oceanography or
related discipline, with demonstrated expertise in numerical modeling and data analysis.
Strong communication skills and a record of peer-reviewed publications are expected.
To apply, please send a cover letter, CV, and contact information for [2–3] references
to kravtsov@uwm.edu. Review of applications will begin on October 1 and continue until
the position is filled.
The University of Wisconsin is an Equal Opportunity Employer. Applicants and employees
are protected from discrimination according to the Federal law. Click here for additional
information.
Sergey Kravtsov, Ph.D.
Professor, School of Freshwater Sciences
University of Wisconsin-Milwaukee
600 E. Greenfield Ave
Milwaukee, WI 53204
Mobile: 414-477-3306
E-mail: kravtsov@uwm.edu
Web: https://sites.uwm.edu/kravtsov The School of Freshwater Sciences at the University of Wisconsin-Milwaukee invites
applications for a Postdoctoral Associate position in the area of Atmospheric Science with
the focus on empirical modeling of weather and climate. The successful candidate will
apply linear and non-linear data-driven techniques for the global simulation and
subseasonal forecasting of precipitation and temperature. The appointment is full-time,
available starting November 1, 2025, and is for an initial period of one year, with potential
renewal based on performance and funding.
The Postdoctoral Associate is expected to: (i) develop improvements to the existing yet
experimental methodology of data-driven high-resolution modeling of global precipitation
and temperature based on linear inverse models; (ii) quantify the updated model’s
performance in reproducing the statistics of the observed variability and assess its
prediction skill; (iii) analyze model dynamics to explain the sources of skill; (iv) collaborate
closely with other team members; and (v) publish findings in peer-reviewed journals and
present results at scientific conferences.
Candidates should hold a Ph.D. in Atmospheric Science or related discipline, with
demonstrated expertise in big data analysis and data-driven modeling. Strong
communication skills and a record of peer-reviewed publications are expected.
To apply, please send a cover letter, CV, and contact information for [2–3] references
to kravtsov@uwm.edu. Review of applications will begin on October 1 and continue until
the position is filled.
The University of Wisconsin is an Equal Opportunity Employer. Applicants and employees
are protected from discrimination according to the Federal law. Click here for additional
information.
Sergey Kravtsov, Ph.D.
Professor, School of Freshwater Sciences
University of Wisconsin-Milwaukee
600 E. Greenfield Ave
Milwaukee, WI 53204
Mobile: 414-477-3306
E-mail: kravtsov@uwm.edu
Web: https://sites.uwm.edu/kravtsov
Reposted by Clark Evans
ncar-ucar.bsky.social
The Advanced Study Program’s Graduate Visitor Program Fellowship is accepting applications! This fellowship allows graduate students to work on their thesis, dissertation, or final project equivalent, with guidance from NSF NCAR scientists and engineers.
clarkevanswx.bsky.social
Faint hint of the northern lights at 40°N in Colorado.
clarkevanswx.bsky.social
Not by any fault of the programs, necessarily, but because enrollments across their universities are declining, and small programs are always the first on the chopping block then — often no matter their quality. (2/2)
clarkevanswx.bsky.social
Another factor: I do think the relative “safeness” varies geographically. Programs in the south, where the college-aged population remains steady or increasing, are safer. Programs in the Midwest and northeast, where the college-aged population is declining, are more at risk. (1/2)
clarkevanswx.bsky.social
I was chatting with a friend earlier this week about the stability of atmospheric science academic programs. We agreed that the number of "safe" programs is somewhere between 5-10. For better or worse, we're a niche field, and college admins love big programs and don't care much about quality. (1/3)
clarkevanswx.bsky.social
And it all absolutely stinks. It was hell for me and my colleagues and our students to go through and I don't wish it on anyone. There's a lot of really high quality programs and people in our field. I fear that we're just at the tip of the iceberg. (3/3)
clarkevanswx.bsky.social
I fear that any program that doesn't have at least 100 undergraduates and/or is super research active is at least somewhat threatened. There's a bit of shielding in having the program embedded in another one -- e.g., atmo/met as a geography concentration -- but only so much. (2/3)
clarkevanswx.bsky.social
I was chatting with a friend earlier this week about the stability of atmospheric science academic programs. We agreed that the number of "safe" programs is somewhere between 5-10. For better or worse, we're a niche field, and college admins love big programs and don't care much about quality. (1/3)
clarkevanswx.bsky.social
Since state aid is calculated on a per-pupil basis, school districts are loathe to give up students — and the municipalities in which the developments occur are loathe to fight to keep the students in their school district since they’ll still benefit from the additional to the property tax rolls.
clarkevanswx.bsky.social
Some of it is affected by annexations. I think of a new neighborhood on the northwest edge of the Village of Grafton. It used to be part of the Town of Cedarburg and in the Cedarburg School District, but it was annexed to the more-adjacent Village of Grafton when developed.
clarkevanswx.bsky.social
😭, says the person who has long used that line to start an email to someone I’ve never met before