It began previous Saturday — a dense plume of dust and sand blowing from the Sahara Desert and out above Atlantic.
The sky above Spain’s Canary Islands before long turned from blue to tan — and then ailments deteriorated as a 2nd plume of dust washed above the islands. Visibility plummeted to just tens of meters in some destinations. That mixed with solid winds gusting to 75 miles for every hour forced airports to near, and almost 800 flights to be cancelled or re-routed.
Recognized domestically as as “La Calima,” the phenomenon typically is brought on by warm, high tension above the Sahara and a very low-tension storm technique out above the northeastern Atlantic. This time was no different.
In the graphic previously mentioned, acquired by the GOES-sixteen weather conditions satellite on Monday, Feb. 24, you can see the sand and dust wrapping into the cyclonic circulation of an Atlantic storm technique.
And here is a movie exhibiting the swirling, dust-laden storm:
The movie cycles numerous situations so you can get a superior view of the storm. Recognized as a cut-off very low, it has turn into displaced — or cut off — from the upper level air currents that typically carry units from the west to the east.
When the occasion initial acquired heading, the European Sentinel-three satellite spied what Washington Submit meteorologist Matthew Cappucci explained as “jets of dust dashing toward the Canaries, with roll clouds forming alongside the major edge of their choking breeze.”
Strong winds blowing from the Sahara carried big amounts of sand out to sea on Saturday, Feb. 22, as noticed in this satellite graphic. (EO Browser)
The graphic previously mentioned, captured by the European Sentinel-three satellite, exhibits what that looked like. As high winds had been propelling dust from Western Sahara and Morroco toward the Canary Islands, very long, tube-formed attributes shaped about perpendicular to the wind move. These are dust-laden roll clouds, which typically are connected with a gust entrance.
Other curious attributes shaped downwind of the Canaries, as noticed in this graphic from the Aqua satellite on February 23:
Strong winds blowing to the northwest carried dust and sand above the Canary Islands on Feb. 23, as noticed in this graphic acquired by NASA’s Aqua satellite. (Supply: NASA Earth Observatory)
The solid winds had been deflected upward by mountains on the islands. Substantially like waves that form downstream of a rock in a stream, atmospheric waves acquired recognized downstream of the islands.
These attributes, which go by different names — lee waves, wave clouds, and orographic waves — are typically noticeable in satellite photographs as a chevron-formed pattern of normal clouds forming downwind of an island. In this situation, it appears like the copious dust becoming carried by the winds from the Sahara have served to make the waves noticeable.