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Igualada's sky takes center stage at European Balloon Festival with 50 hot air balloons
Event sees international pilots competing during four days in central Catalonia
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29.1ºC: Barcelona hits all-time high temperature in April since at least 1914
Lleida area and Ebre river delta region surpass 30ºC in unseasonable hot weather
Catalonia on high alert as temperatures rise above 40 degrees
Authorities advise caution with vulnerable groups especially as forecasts predict heat will continue until Tuesday