NOAA unveils 2 weather and climate supercomputers for improved forecasting

The new computing power will allow the service to get further ahead of catastrophic weather events like hurricanes.
Jamie Rhome, deputy director of NOAA's National Hurricane Center, speaks to the media at the National Hurricane Center on June 01, 2022 in Miami. (Photo by Joe Raedle/Getty Images)

The National Oceanic and Atmospheric Administration’s two new weather and climate supercomputers, expected to improve forecasts and warnings protecting life and property, became operational at 8 a.m. Eastern time Tuesday.

Dogwood in Manassas, Virginia, and Cactus in Phoenix are configured identically: operating three times faster than their predecessors at 12.1 petaflops and boasting double the storage at 26 petabytes each.

NOAA awarded General Dynamics IT the first, $150 million task order on the $505.2 million Weather and Climate Operational Supercomputing System (WCOSS) contract in February 2020 with the goal of improving models guiding forecasts.

“As forecasts become more accurate, and weather and climate events become more extreme, the public needs more detailed forecast information further in advance,” Ken Graham, director of the National Weather Service, said on a press call Tuesday. “And this takes more advanced computing.”


The twin Hewlett Packard Enterprise Cray supercomputers, ranked 49th and 50th fastest in the world by the TOP500 project, will provide NOAA’s NWS with:

  • high-resolution models that better capture small-scale features like severe thunderstorms,
  • more realistic model physics that better represent the formation of clouds and precipitation,
  • a larger number of individual model simulations to better quantify confidence in results, and
  • improved use of billions of weather observations to better forecast.

Dogwood and Cactus will further pave the way for fall upgrades to the Global Forecast System (GFS), air quality models, and ocean-going and Great Lakes wave prediction systems.

NOAA is moving from deterministic models to ensemble-based systems that couple atmosphere and oceans, giving forecasters the ability to assess the probability something might happen.

“Being able to provide probabilistic information to the public, through the use of ensemble-based modeling systems, is going to be a very exciting change coming up,” said Brian Gross, director of NOAA’s Environmental Modeling Center.


NOAA further plans to launch a new hurricane forecast model, the Hurricane Analysis and Forecast System (HAFS), ahead of the 2023 hurricane season — pending tests and evaluations. HAFS replaces two legacy systems, and will predict the track and intensity of tropical cyclones.

NWS will be able to extend hurricane forecasts to seven days, Graham said. 

Dogwood and Cactus’ predecessors were located in Reston, Virginia, and Orlando, Florida — a problem if a catastrophic weather event hit the East Coast downing both. That’s why the new supercomputers are hosted on opposite sides of the country.

WCOSS is an eight-year base contract with a two-year renewal. While its predecessor included performance enhancements on the front end — requiring IBM to guarantee price performance 10 years out — NOAA only required GDIT to propose the first task order award for this contract.

“I’m actually really excited about that because it leaves us open to be able to look at what are experiences on the existing system, where we need to make improvements in balance in the computing system, or as different technologies evolve we can take advantage of those and not be strapped to that initial price performance guess,” said Dave Michaud, director of NWS’s Office of Central Processing.


NOAA anticipates the second phase task order, covering the last five years of the contract, will be awarded in the 2024-25 timeframe.

The agency will work with GDIT to identify industry trends and incorporate those, along with any new computing requirements, into the next phase of WCOSS.

“We’ve actually left that wide open,” Michaud said.

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