The storm was named by Agencia Estatal de Meteorología (AEMET) on 5 November, with the agency issuing wind and rain alerts to the Balearic archipelago and other areas reaching the eastern coasts of Spain, as Blas approached from the east.

It then turned eastward after moving slowly westward, and the storm meandered across the western Mediterranean for the next several days, before eventually dissipating to the west of Italy on 18 November.

Heavy rainfall and gusty winds impacted the Balearic Islands as a result of Blas, with trees being damaged and many water basins overflowing.

A total of 9 deaths were reported from the storm and $1 Million Damage (US$) Blas originated from an extratropical low of the coast of Algeria on 5 November.

At 10:15 UTC that same day, Blas was named by the Agencia Estatal de Meteorología (AEMET), due to the potential for the storm to bring strong wind gusts to the Balearic Islands.

[7][2][3][8][9] Around 11 November, Blas exhibited compact convection over its center, resembling a tropical cyclone in appearance, though this was short-lived.

[28] In addition, a small vessel sank off the coast of El Fonduco due to high seas, although no one was injured.

[40] Disruption in transportations of fresh products in Menorca was also seen due to the closure of ports leading to the island.

[43] Blas also affected Barcelona with heavy rains and rough seas, with beach stores closing and emergency plans activating in the city.

Waves up to 2.3–3.3 m (7.5–10.8 feet) also breached some sand on a beach while surfers were prohibited to undergo surfing activities.

[44][45] By 10 November, a sailboat crew was rescued by the emergency authorities in Mallorca as the mast of his vessel broke up.

[48] Due to storm-related flash floods, many roads were impassable to light vehicles and/or forced to close.

Cars were also drowned in the floods, with Civil Protection authorities successfully rescuing two individuals each on Oum El Bouaghi Province and an unnamed street.