An Unrelenting Tule Fog

An atmospheric phenomenon occurring over much of California was unmistakable in satellite imagery in late autumn 2025. Fog stretching some 400 miles (640 kilometers) across the state’s Central Valley appeared day after day for more than two weeks in late November and early December. Known as tule (TOO-lee) fog, named after a sedge that grows in the area’s marshes, these low clouds tend to form in the valley in colder months when winds are light and soils are moist.  

This animation shows a sprawling blanket of white fog filling most or all of the valley from Redding to Bakersfield between November 24 and December 9, 2025. While the fog mostly remained hemmed in by the Coastal Range and the Sierra Nevada, it sometimes spilled through the Carquinez Strait toward San Francisco Bay. These images were acquired with the MODIS (Moderate Resolution Imaging Spectroradiometer) instrument on NASA’s Terra satellite and the VIIRS (Visible Infrared Imaging Radiometer Suite) on the NOAA-20 and Suomi NPP satellites.

The Central Valley is fertile ground for the formation of tule fog, a persistent radiation fog, in late autumn and winter. It occurs when air near the surface, laden with moisture from evaporation, cools and the water saturates the air. If winds are calm, water droplets accumulate into fog clouds near the ground.

Plenty of water was present in the valley’s soils following a very wet autumn. Across nearly all of central and southern California, precipitation totals from September through November 2025 were among the top 10 percent on record, California Institute for Water Resources climate scientist Daniel Swain noted on his Weather West blog. In late November, a very stable high-pressure system developed over the state, which acted like a lid that trapped moist air and confined the fog layer to the valley. With no major storms moving through to disrupt the stratification, the tule fog endured.

Temperatures have been notably cooler in the valley under the fog layer, in sharp contrast to the rest of the state, which was mostly warmer than normal. Despite the contrast, however, the ambient air mass has been warmer overall, Swain wrote. This may be due in part to warm ocean water offshore and a low Sierra Nevada snowpack sending less cold air downslope, he added.

The warmer overall temperatures could explain why fog has lingered at a slightly higher level—more like stratus clouds—at certain times and locations, said Swain. Colder temperatures would be necessary to produce the densest fog near the surface. The somewhat higher cloud in 2025 has differed from past events, when low visibility at ground level has caused major traffic incidents.

Central California has seen long stretches of cold, socked-in days in the past. In 1985, for example, Fresno experienced 16 consecutive days of dense fog, and Sacramento endured 17, according to news reports. Researchers have found, however, that tule fog has been forming less often in California in recent decades. Foggy days are beneficial for the valley’s fruit and nut trees, which need sufficient rest between growing seasons to be most productive. The fog typically comes with chilly weather that brings on a dormant period; it also shields trees from direct sunlight that would otherwise warm the plant buds.

NASA Earth Observatory images by Lauren Dauphin, using MODIS data from NASA EOSDIS LANCE and GIBS/Worldview, and VIIRS data from NASA EOSDIS LANCE, GIBS/Worldview, the Suomi National Polar-orbiting Partnership, and the Joint Polar Satellite System (JPSS). Story by Lindsey Doermann.

References & Resources

• Baldocchi, D., and Waller, E. (2014) Winter fog is decreasing in the fruit growing region of the Central Valley of California. Geophysical Research Letters, 41, 3251–3256.
• NASA Earth Observatory (2020, December 22) Cool Yule Tule. Accessed December 10, 2025.
• National Weather Service Radiation Fog. Accessed December 10, 2025.
• The Washington Post (2025, November 29) Why a 400-mile long fog bank lingered over California for a week. Accessed December 10, 2025.
• Weather West (2025, December 6) Under a resilient ridge, prolonged tule fog episode brings cold and damp weather to the Central Valley but anomalously warm/dry weather elsewhere. Accessed December 10, 2025.
• Weather West, via YouTube (2025, December 2) California weather update: Tule fog, a December dry spell, and an overview of our topsy-turvy autumn. Accessed December 10, 2025.

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NASA JPL Unveils Rover Operations Center for Moon, Mars Missions

The center leverages AI along with JPL’s unique infrastructure, unrivaled tools, and years of operations expertise to support industry partners developing future planetary surface missions.  

NASA’s Jet Propulsion Laboratory in Southern California on Wednesday inaugurated its Rover Operations Center (ROC), a center of excellence for current and future surface missions to the Moon and Mars. During the launch event, leaders from the commercial space and AI industries toured the facilities, participated in working sessions with JPL mission teams, and learned more about the first-ever use of generative AI by NASA’s Perseverance Mars rover team to create future routes for the robotic explorer. 

The center was established to integrate and innovate across JPL’s planetary surface missions while simultaneously forging strategic partnerships with industry and academia to advance U.S. interests in the burgeoning space economy. The center builds on JPL’s 30-plus years of experience developing and operating Mars surface missions, including humanity’s only helicopter to fly at Mars as well as the only two active planetary surface missions. 

“The Rover Operations Center is a force multiplier,” said JPL Director Dave Gallagher. “It integrates decades of specialized knowledge with powerful new tools, and exports that knowledge through partnerships to catalyze the next generation of Moon and Mars surface missions. As NASA’s federally funded research and development center, we are chartered to do exactly this type of work — to increase the cadence, the efficiency, and the impact for our transformative NASA missions and to support the commercial space market as they take their own giant leaps.” 

Genesis of ROC 

Through decades of successful Mars rover missions, JPL has continuously improved the unique autonomy, robotic capabilities, and best practices that have been demanded by increasingly complex robotic explorers. The ROC offers an accessible centralized structure to facilitate future exploration efforts. 

“Our rovers are lasting longer and are more sophisticated than ever before. The scientific stakes are high, as we have just witnessed with the discovery of a potential biosignature in Jezero Crater by the Perseverance mission. We are starting down a decade of unprecedented civil and commercial exploration at the Moon, which will require robotic systems to assist astronauts and support lunar infrastructure,” said Matt Wallace, who heads JPL’s Exploration Systems Office. “Mobile vehicles like rovers, helicopters, and drones are the most dynamic and challenging assets we operate. It’s time to take our game up a notch and bring everybody we can with us.”  

Future forward  

A key focus of the ROC is on the more rapid infusion of higher-level autonomy into surface missions through partnerships with the AI and commercial space industries. The objective is to catalyze change to deliver next-generation science and exploration capabilities for the nation and NASA. 

As NASA’s only federally funded research and development center, JPL has been evolving vehicle autonomy since the 1990s, when JPL began developing Sojourner, the first rover on another planet. Improvements to vehicle independence over the years have included the evolution of autonomy in sampling activities, driving, and science-target selection. Most recently, those improvements have extended to the development of Perseverance’s ability to autonomously schedule and execute many commanded energy-intensive activities, like keeping warm at night, as it sees fit. This capability allows the rover to conserve power, which it can reallocate in real time to perform more science or longer drives. 

With the explosion of AI capabilities, the ROC rover team is leaving no Mars stone unturned in the hunt for future efficiencies.  

“We had a small team complete a ‘three-week challenge,’ applying generative AI to a few of our operational use cases. During this challenge, it became clear there are many opportunities for AI infusion that can supercharge our capabilities,” said Jennifer Trosper, ROC program manager at JPL. “With these new partnerships, together we will infuse AI into operations to path-find the next generation of capabilities for science and exploration.”  

During the ROC’s inauguration, attendees toured JPL operations facilities, including where the rover drivers plan their next routes. They also visited JPL’s historic Mars Yard, which reproduces Martian terrain to test rover capabilities, and the massive 25-Foot Space Simulator that has tested spacecraft from Voyagers 1 and 2 to Perseverance to America’s next generation of lunar landers. A panel discussion explored the historical value of rovers and aerial systems like the Ingenuity Mars Helicopter in planetary surface exploration. Also discussed was the promise of a new public-private partnership opportunity across a virtual network of operational missions.  

Attendees were briefed on tiered engagement options for partners, from mission architecture support to autonomy integration, testing, and operations. These opportunities extend to science and human precursor robotic missions, as well as to human-robotic interaction and spacewalks for astronauts on the Moon and Mars. 

A highlight for event participants came when the Perseverance team showcased how the ROC’s generative AI can assist rover planners in creating future routes for the rover. The AI analyzed high-resolution orbital images of Jezero Crater and other relevant data and then generated waypoints that kept Perseverance away from hazardous terrain. 

Managed for NASA by Caltech, JPL is the home of the Rover Operations Center (ROC).  

To learn more about the ROC, visit:

https://www.jpl.nasa.gov/roc

News Media Contact

DC Agle
Jet Propulsion Laboratory, Pasadena, Calif.
818-393-9011
agle@jpl.nasa.gov

2025-137

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25 Years of Space Station Technology Driving Exploration 

NASA and its partners have supported humans continuously living and working in space since November 2000. After 25 years of habitation, the International Space Station continues to be a proving ground for technology that powers NASA’s Artemis campaign, future lunar missions, and human exploration of Mars.  

Take a look at key technology advancements made possible by research aboard the orbiting laboratory.  

Robots at work in orbit  

Robots have been critical to the space station’s success. From the Canadian-built Canadarm2, which assembled large portions of the orbiting laboratory and continues to support ongoing operations, especially during spacewalks, robotic technology on station has evolved to include free-flying assistants and humanoid robots that have extended crew capabilities and opened new paths for exploration. 

The station’s first robotic helpers arrived in 2003. The SPHERES robots – short for Synchronized Position Hold, Engage, Reorient, Experimental Satellite – served on station for over a decade, supporting environmental monitoring, data collection and transfer, and materials testing in microgravity.  

NASA’s subsequent free-flying robotic system, Astrobee, built on the lessons learned from SPHERES. Known affectionately as Honey, Queen, and Bumble, the three Astrobees work autonomously or via remote control by astronauts, flight controllers, or researchers on the ground. They are designed to complete tasks such as inventory, documenting experiments conducted by astronauts, or moving cargo throughout the station, and they can be outfitted and programmed to carry out experiments. 

NASA and partners have also tested dexterous humanoid robots aboard the space station. Robonaut 1 and its more advanced successor, Robonaut 2, were designed to use the same tools as humans, so they could work safely with crew with the potential to take over routine tasks and high-risk activities.  

Advanced robotic technologies will play a significant role in NASA’s mission to return to the Moon and continue on to Mars and beyond. Robots like Astrobee and Robonaut 2 have the capacity to become caretakers for future spacecraft, complete precursor missions to new destinations, and support crew safety by tackling hazardous tasks. 

Closing the loop: recycling air and water in space 

Living and working in space for more than two decades requires technology that makes the most of limited resources. The space station’s life support systems recycle air and water to keep astronauts healthy and reduce the need for resupply from Earth. 

The station’s Environmental Control and Life Support System (ECLSS) removes carbon dioxide from the air, supplies oxygen for breathing, and recycles wastewater—turning yesterday’s coffee into tomorrow’s coffee. It is built around three key components: the Water Recovery System, Air Revitalization System, and Oxygen Generation System. The water processor reclaims wastewater from crew members’ urine, cabin humidity, and the hydration systems inside spacesuits for spacewalks, converting it into clean, drinkable water. 

The air revitalization system filters carbon dioxide and trace contaminants from the cabin atmosphere, ensuring the air stays safe to breathe. The oxygen generation system uses electrolysis to split water into hydrogen and oxygen, providing a steady supply of breathable air. Today, these systems can recover around 98% of the water brought to the station, a vital step toward achieving long-duration missions where resupply will not be possible. 

The lessons learned aboard the space station will help keep Artemis crews healthy on the Moon and shape the closed-loop systems needed for future expeditions to Mars. 

Advancing 3D printing technology for deep space exploration 

Additive manufacturing, also known as 3D printing, is regularly used on Earth to quickly produce a variety of devices. Adapting this process for space could let crew members create tools and parts for maintenance and repair as needed and save valuable cargo space. 

Research aboard the orbiting laboratory is helping to develop this capability.  

The space station’s first 3D printer was installed in November 2014. That device produced more than a dozen plastic tools and parts, demonstrating that the process could work in low Earth orbit. Subsequent devices tested different printer designs and functionality, including the production of parts from recycled materials and simulated lunar regolith. In August 2024, a device supplied by ESA produced the first metal 3D-printed product.    

The space station also has hosted studies of a form of 3D printing called biological printing or bioprinting. This process uses living cells, proteins, and nutrients as raw materials to potentially produce human tissues for treating injury and disease. So far, a knee meniscus and live human heart tissue have been printed onboard.

The ability to manufacture things in space is especially important in planning for future missions to the Moon and Mars because additional supplies cannot quickly be sent from Earth and cargo capacity is limited. 

We have the solar power 

As the space station orbits Earth, its four pairs of solar arrays soak up the sun’s energy to provide electrical power for the numerous research and science investigations conducted every day, as well as the continued operations of the orbiting laboratory. 

In addition to harnessing the Sun’s energy for its operations, the space station has provided a platform for innovative solar power research. At least two dozen investigations have tested advanced solar cell technology – evaluating the cells’ on-orbit performance and monitoring degradation caused by exposure to the extreme environment of space. These investigations have demonstrated technologies that could enable lighter, less expensive, and more efficient solar power that could improve the design of future spacecraft and support sustainable energy generation on Earth.  

One investigation – the Roll-Out Solar Array – has already led to improvements aboard the space station. The successful test of a new type of solar panel that rolls open like a party favor and is more compact than current rigid panel designs informed development of the ISS Roll-Out Solar Arrays (iROSAs). The six iROSAs were installed during a series of spacewalks between 2021 and 2023 and provided a 20% to 30% increase in space station power. 

Connecting students to station science 

For 25 years, the orbital outpost has served as a global learning platform, advancing STEM education and connecting people on Earth to life in space. Every experiment, in-flight downlink, and student-designed payload helps students see science in action and share humanity’s pursuit of discovery. 

The first and longest-running education program on the space station is ISS Ham Radio, known as Amateur Radio on the International Space Station (ARISS), where students can ask questions directly to crew members aboard the space station. Since 2000, ARISS has connected more than 100 astronauts with over 1 million students across 49 U.S. states, 63 countries, and every continent. 

Through Learn with NASA, students and teachers can explore hands-on activities and astronaut-led experiments that demonstrate how physics, biology, and chemistry unfold in microgravity. 

Students worldwide also take part in research inspired by the space station. Programs like Genes in Space and Cubes in Space let learners design experiments for orbit, while coding and robotics competitions such as the Kibo Robot Programming Challenge allows students to program Astrobee free-flying robots aboard the orbiting laboratory. 

As NASA prepares for Artemis missions to the Moon, the space station continues to spark curiosity and inspire the next generation of explorers. 

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Retirement

Retirement Information for NASA Employees

The NSSC provides general administrative, advisory, and transactional support for federal benefits programs to all NASA employees, calculates retirement estimates, and processes retirement packages.

In consideration of retiring employees on administrative leave, resources typically available only to NASA employees behind the NASA firewall are temporarily available below.  Most of your questions can be answered with one of these guides or the information below.

• Civil Service Retirement System (CSRS) – What you need to know about retirement
• Federal Employees Retirement System (FERS) – What you need to know about retirement

This information may help you resolve questions you would otherwise contact the NASA Shared Services Center (NSSC) about.

All other NASA employees can visit the NASA employee intranet for additional information.

Inquiry Response Times

NASA is experiencing a significant influx of inquiries due to the high number of upcoming retirements. Response times will be slower than normal. Please do not send repeated follow-ups, as that creates bottlenecks and further delays responses. All inquiries will be answered in the order received. Thank you for your patience.  

Retirement Annuity Start Dates and Processing Timelines 

FERS retirees with a retirement date on or before Dec. 31, 2025: 

• Your annuity begins accruing Jan. 1, 2026. 

• Your first payment is expected mid-February 2026. 

• Because payments begin in February, your application is still considered timely even if it remains with the NSSC through late January. 

• As long as your case reaches Payroll Review by February, there will be no delay in your annuity. 

CSRS retirees with a retirement date on or before Jan. 3, 2026: 

• Your annuity will accrue starting in January 2026, with the first payment mid-February 2026. 

• Processing is still considered on time if NSSC completes its portion by late January, and your case reaches Payroll Review by February. 

FERS employees retiring Jan. 1, 2026 or later and CSRS employees retiring Jan. 4, 2026, or later: 

• Your annuity begins accruing Feb. 1, 2026. 

• Your first payment is expected mid-March 2026. 

• Applications can typically remain in HR review through February. 

• As long as your package reaches Payroll Review by the end of February, your retirement payment will not be delayed.

VSIP Payments and Lump Sum Leave Payments 

VSIP payments will be issued with your final NASA paycheck. We do not expect any delays to VSIP payments. Even if your retirement application is not finalized by your retirement date it will not delay your VSIP. 

Lump sum annual leave payments for employees retiring Dec. 28, 2025, through Jan. 10, 2026, are expected to be paid around Feb. 13, 2026. Even if your retirement application is not finalized by your retirement date it will not delay your lump sum leave payment. 

All NASA issued payments, to include your last paycheck, VSIP, and lump sum leave, will be deposited into the same bank account used for your NASA payroll. Updates made in the Online Retirement Application (ORA) do not affect NASA payroll. ORA updates only apply to your future retirement annuity. 

Understanding Online Retirement Application Statuses

In Process/Not Started:

• The application is with the employee for action. The NSSC cannot move it forward until the employee completes required steps. This is the only stage at which an employee can adjust or make changes to their application in ORA.

In HR Review:

• Your application is actively being worked by the NSSC Retirement Services team. Thousands of retirements are in the queue, so please be patient. Once your application is in HR Review (or beyond) you cannot make any changes. If you have a change that needs to be made, submit a Web Inquiry to the NSSC.

In Applicant Review:

• The application is back with the employee for final certification. Once completed, the status will update to In HR Finalized.

In HR Finalized:

• The NSSC has completed its portion and will release the package to payroll.

In Payroll Review:

• Your application is no longer with NASA. It is with the Department of the Interior, Interior Business Center (IBC), NASA’s payroll provider.
• Applications typically remain in Payroll Review for about 30 days after your retirement date while payroll records close. IBC will then certify the package and submit it to OPM.

Email Address Changes in ORA

• Do not change your email address once you begin your retirement application. ORA does not allow email updates mid-process. 

• Changing your email requires deleting your application and starting over, which can significantly delay your place in the queue. 

• You may update your preferred email later in OPM Services Online once your case transfers to OPM. 

Retirement Counseling and Training

• FERS employees may register for weekly group retirement counseling sessions. Register at this Prepare for Your Retirement: NSSC Retirement Counseling Sessions (FERS) page.
• A final CSRS counseling session will be held Dec. 23. Eligible employees have already received a Teams meeting invitation via their personal email address. If you missed this invitation, you may submit a Web Inquiry to the NSSC to have it resent.

Resources

• A Retiree’s Guide for Preparing to Retire 
• Benefits and Retirement Information 
• Retirement Quick Guide 
• OPM Retirement & Insurance Publications
• OPM Retirement FAQs

Forms

• Continuation of Life Insurance Election, SF 2818
• CSRS Spousal Consent to Survivor Election
• FERS Spousal Consent to Survivor Election
• Withholding Certificate for Periodic Pension or Annuity Payments, W-4P
• Medicare Request for Employment Information (only applicable for employees who are over age 65 and enrolling in Medicare during a Special Enrollment Period)
• Guidance on Reviewing and Updating Beneficiary Forms
• Voluntary Contribution Election (only for CSRS employees who have participated in the Voluntary Contribution Program)

Retirement – Court Orders

Courts can issue orders that award benefits to legally separated spouses, former spouses, and children of current employees, former employees, and retirees under the Civil Service Retirement System (CSRS) and the Federal Employees Retirement System (FERS). NASA cannot advise an employee, an employee’s spouse, or an attorney on how to draft a court order to award CSRS or FERS benefits. This is the task of the attorneys involved.  

The NSSC cannot provide estimates that would require speculation about future promotions, program changes, or any other non-factual information and does not prepare estimates for employees who are not close to retirement. Official computations are made by OPM only at the time benefits become payable. 

If you are involved in a divorce, legal separation, or annulment, you should provide the NSSC with a copy of your court order to expedite the processing of your retirement in the future.

Action required: Mail a court-certified copy of the court order to the address below and upload a copy in your ORA account: 

• Attention:  Retirement Services
  NSSC
  Bldg 1111, Jerry Hlass Rd
  Stennis Space Center, MS 35929 

Court Ordered Benefits Information

• Court Ordered Benefits for Former Spouses Pamphlet
• Handbook for Attorneys

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NASA Demonstrates Safer Skies for Future Urban Air Travel 

NASA is helping shape the future of urban air travel with a new simulation that will manage how electric air taxis and drones can successfully operate within busy areas.  

The demonstration, held at NASA’s Ames Research Center in California’s Silicon Valley earlier this year, focused on a system called the Strategic Deconfliction Simulation, which helps coordinate flight plans before takeoff, reducing the risk of conflicts in busy urban environments 

At the event, researchers demonstrated NASA’s Situational Viewer and Demand-Capacity Balancing Monitor, which visualizes air traffic and adjusts flight plans in real time. The simulation demonstrated traffic scenarios involving drone operations throughout the Dallas-Fort Worth area, testing how preplanned flights could improve congestion and manage the demand and capacity of the airspace – ensuring that all aircraft can operate smoothly even in crowded conditions. 

Working with industry partners is critical to NASA’s efforts to develop and refine technologies needed for future air mobility. During the simulation, the company, ANRA Technologies, demonstrated its fleet and vertiport management systems, which are designed to support the coordination of multiple aircraft and ground operations. 

“Simulating these complex environments supports broader efforts to ensure safe integration of drones and other advanced vehicles into the US airspace,” said Hanbong Lee, engineer at NASA Ames. “By showcasing these capabilities, we’re delivering critical data and lessons learned to support efforts at NASA and industry.” 

This demonstration is another step toward the NASA team’s plan to hold a technical capability level simulation in 2026. This upcoming simulation would help shape the development of services aimed at managing aircraft flying in urban areas.  

The simulation was created through a NASA team from its Air Mobility Pathfinders project, part of the agency’s continuing work to find solutions for safely integrating innovative new aircraft such as air taxis into U.S. cities and the national airspace. By developing advanced evaluations and simulations, the project supports safe, scalable, and publicly trusted air travel in urban areas, paving the way for a future where air taxis and drones are a safe and reliable part of everyday life. 

The project falls under NASA’s Airspace Operations and Safety Program, which works to enable safe and efficient aviation transportation. 

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