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Climate Measurement

NOAA model predicts how the solar eclipse will shift the weather

Elizabeth BakerBy Elizabeth BakerOctober 20, 20233 Mins Read
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Credit NOAA GLOBAL SYSTEMS LABORATORY
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NOAA Global Systems Laboratory (GSL) has created a short-range weather forecast High-Resolution Rapid Refresh (HRRR) model that includes the eclipse in its weather forecasts. This is expected to make better forecasts for the wind, solar and even conventional energy sectors.

“This is important for the energy industry, allowing them to use NOAA’s weather model toward predicting solar and wind power generation even during rare but important eclipse disruptions,” said Stan Benjamin, a CIRES scientist who was the senior scientist at the NOAA Global Systems Laboratory (GSL) until his federal retirement last year.

In places where rooftop solar energy, solar farms or wind farms contribute to power generation, the industry will now be able to model potential disruptions caused by the eclipse and make plans to adjust generation and backup.

Benjamin and his team – including colleagues from NOAA GSL, CIRES and CIRA – first incorporated eclipses into the then-experimental version of the HRRR model before the 2017 total solar eclipse, and it worked well. By the time a partial solar eclipse hit the Arctic in June of 2021, NOAA’s operational weather forecasts included eclipses. Now, that model is taking on, for the first time, an eclipse over the continental USA.

In a solar eclipse, the moon passes between Earth and the sun, fully or partially obscuring our star for a little while, and temperatures can dip 4-10°F (2-6°C). Less solar radiation hits the Earth, and since spatial differences in solar radiation drive turbulence in the atmosphere, the winds will quiet for a while. For a few hours that morning, as the eclipse passes by and temperatures remain lower for longer, the turbulent eddies that normally mix up the lowest part of our atmosphere will be less intense, which can greatly affect changes in the lowest part of the atmosphere. Less turbulence can affect low-level clouds, too, and some may disappear before or after the eclipse, with further impacts on the amount of downwelling solar energy.

Thanks to this team’s work, the HRRR now represents all solar eclipses that will occur in the next four decades, including the total solar eclipse that will pass over the USA from Texas to the Northeast on April 8, 2024.

Energy industry representatives have publicly shared their gratitude to the team on LinkedIn. “Thanks for the amazing teamwork!” Amber Motley, director of short-term forecasting at the California Independent Systems Operator, wrote to Benjamin. “Grateful to be able to utilize the HRRR to account for impacts.”

“Improvements like this to the HRRR are an example of the research being done by NOAA and its partners,” said Dave Turner, GSL’s current senior scientist. “Scientists in NOAA are focusing on how to provide improved forecasts of solar and wind, which has been demonstrated to save the energy consumers potentially tens of millions of dollars per year by providing the information needed by the energy companies to more efficiently integrate renewable energy into the electrical grid. More accurate solar and wind forecasts from NOAA also help to accelerate the decarbonization of power generation in the United States.”

To find out more about NOAA’s latest developments, click here.

Previous ArticleFinnish Meteorological Institute to coordinate bioaerosol monitoring and modeling project
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