![]() Local ground stations in numerous cities reported all-time-record highs on June 27. Actual measurements of physical properties, like temperature, moisture, and winds, are routinely folded into the model to keep the simulation as close to observed reality as possible. The GEOS model, like all weather and climate models, uses mathematical equations that represent physical processes (such as precipitation and cloud processes) to calculate what the atmosphere will do. Red areas are where air temperatures climbed more than 27☏ (15☌) higher than the 2014-2020 average for the same day. ![]() The map is derived from the Goddard Earth Observing System (GEOS) model and depicts air temperatures at 2 meters (about 6.5 feet) above the ground. The second map shows air temperature anomalies across the continental United States and Canada on June 27, 2021, when the heat intensified and records started to fall. Note that land surface temperatures are not the same as air temperatures: They reflect how hot the surface of the Earth would feel to the touch and can sometimes be significantly hotter or cooler than air temperatures. By June 26, excessive heat warnings were in place across Washington, Oregon, and Northern California.ĭata for the map come from NASA’s ECOsystem Spaceborne Thermal Radiometer Experiment on Space Station (ECOSTRESS), which uses a scanning radiometer to measure thermal infrared energy emitted from Earth’s surface. The data show that around noon on that day, surface temperatures in Seattle reached 120☏ (49☌), and the worst was yet to come. The heat began to build up late last week, and the effect is apparent in this map (above) which shows land surface temperatures on June 25 in Washington. and Canada during a heatwave that the National Weather Service called “historic and dangerous.” In June 2021, all-time temperature records fell in multiple cities in the U.S. ![]() Extraordinary heat events occur around the planet during most summers, but the current heatwave in the Pacific Northwest is truly exceptional. ![]()
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