A temperature of 130 degrees Fahrenheit (54.4 degrees Celsius) recorded in California’s Death Valley on Sunday by the US National Weather Service could be the hottest ever measured with modern instruments, officials say.

The reading was registered at 3:41 pm at the Furnace Creek Visitor Center in the Death Valley national park by an automated observation system—an electronic thermometer encased inside a box in the shade.

In 1913, a weather station half an hour’s walk away recorded what officially remains the world record of 134 degrees Fahrenheit (56.7 degrees Celsius). But its validity has been disputed because a superheated sandstorm at the time may have skewed the reading.