Finland's Ruisrock festival weekend to be muggy and wet with thunderstorms possible

Festival-goers attending Finland's Ruisrock this weekend should prepare for a "muggy and wet" experience, according to meteorologist Pinja Rauhamäki of the Finnish Meteorological Institute.

Thunderstorms are forecast to move in from the coast, driven by a low-pressure system tracking eastward. These storms could bring intense downpours, with rainfall rates potentially reaching 20 millimeters per hour, the threshold for heavy rain warnings. While a formal warning has not yet been issued due to forecast uncertainty, Rauhamäki noted that "there are possibilities for even 20 millimeters in an hour, especially on Friday."

The temperature will hover just above 20 degrees Celsius (68 degrees Fahrenheit), and the high humidity will contribute to a feeling of oppressiveness. Similar conditions are expected across the capital region and central Finland, with rainfall totals between 10 and 25 millimeters predicted from Friday to Sunday.

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There are possibilities for even 20 millimeters in an hour, especially on Friday. That is the threshold for our heavy rain warning. If a stronger shower hits, a lot of water can come in a short time.

Northern Finland is expected to be drier, though isolated thunderstorms are still possible. The meteorologist cautioned that predicting the exact location of these localized showers is difficult, leading to potential perceived inaccuracies in forecasts. "For someone watching the weather forecast, it might seem like the forecast failed completely. In the big picture, it still looks like a perfectly acceptable forecast. That's how it tends to be with showers," she explained.

Unlike much of Europe, which is experiencing extreme heatwaves exceeding 40 degrees Celsius, Finland is not expecting a heatwave in the immediate future. While temperatures may rise slightly by the end of next week, the forecast remains uncertain. Sunday, however, is predicted to be dry with temperatures potentially climbing above 20 degrees Celsius, though heat is unlikely.

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For someone watching the weather forecast, it might seem like the forecast failed completely. In the big picture, it still looks like a perfectly acceptable forecast. That's how it tends to be with showers.