The remnants of thunderstorms that developed over and around Sicily have drifted southwards, bringing a noticeable change to the skies over the Maltese Islands. Although local weather conditions remain dry and settled, many observers have noticed a milky, hazy appearance replacing the deep blue skies typically associated with summer.

This veil is caused by high-level cloud spreading out from the Sicilian thunderstorms. Composed mainly of tiny ice crystals high in the atmosphere, these clouds can travel hundreds of kilometres away from their parent storms. While they produce no rainfall over Malta, they filter incoming sunlight, giving the sky a much paler appearance. They also help trap heat and humidity in the lower atmosphere, making conditions feel warmer and more oppressive despite the absence of direct storm activity.

However, not all the clouds visible today originated from Sicily. The strong summer sunshine over the Maltese Islands also triggered the local development of towering cumulus, known as Cumulus congestus. These clouds form when intense surface heating causes warm, moist air to rise into a moderately unstable layer of the atmosphere. Although their vertical growth has remained limited so far, they are a clear indication of vigorous upward motion and an atmosphere that is not completely stable.

Looking ahead, weather conditions may become even more interesting. Forecasts indicate that strong northwesterly winds over the coming days could transport a cooler airmass into the upper atmosphere.

If this scenario unfolds, the increased contrast between warm surface air and cooler air aloft would enhance atmospheric instability. As the winds gradually ease on Friday and Saturday, this could create favourable conditions for a few isolated July showers to develop across parts of the Maltese Islands.

While widespread rainfall is not expected, the evolving atmospheric setup serves as a reminder that even in the height of summer, the Mediterranean atmosphere can still produce surprising weather.

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