March of the Harmattan

Earth Observatory 

3 min read

March of the HarmattanImage of the Day for April 1, 2026

Strong winds in March 2026 carried Saharan dust across northwestern Africa and toward the Canary Islands, reducing visibility and prompting alerts.

NASA Earth Observatory

Apr 01, 2026 Article

View more Images of the Day:Mar 31, 2026Instruments:

• NOAA-21 — VIIRS
• Terra — MODIS

Topics:

• Air Quality
• Dust Storms

Morning Afternoon A light-brown dust plume with a defined front spreads over northwestern Africa in the late morning.NASA Earth Observatory / Lauren Dauphin By afternoon, the plume has shifted southwest, partly extending over the Atlantic Ocean.NASA Earth Observatory / Lauren Dauphin MorningAfternoon A light-brown dust plume with a defined front spreads over northwestern Africa in the late morning.NASA Earth Observatory / Lauren Dauphin By afternoon, the plume has shifted southwest, partly extending over the Atlantic Ocean.NASA Earth Observatory / Lauren Dauphin Morning Afternoon

March 30, 2026

CurtainToggle2-Up Image Details Saharan dust spreads across northwestern Africa on March 30, 2026, in these images acquired in the morning (left) by the MODIS (Moderate Resolution Imaging Spectroradiometer) on NASA’s Terra satellite and in the afternoon (right) by the VIIRS (Visible Infrared Imaging Radiometer Suite) on NOAA-21.

In early spring 2026, a dry, dust-laden wind known as the harmattan swept across northwestern Africa. Cold temperatures, high winds, and blowing dust prompted officials to issue an alert for several regions of Morocco due to the low visibility and harsh conditions.

Satellites tracked the wall of dust over the course of the day on March 30 as it moved southwest from the Sahara Desert and toward the Atlantic Ocean. The left image, captured by NASA’s Terra satellite, shows the dust at about 10:00 Universal Time (11 a.m. local time in Morocco). The NOAA-21 satellite captured the right image about four hours later.

Meteosat-12, a satellite operated by the European Organization for the Exploitation of Meteorological Satellites (EUMETSAT), captured another view of the dust storm. The geostationary weather satellite showed the dust’s movement as it moved closer to the Canary Islands.

According to Spain’s state meteorological agency (AEMET), the harmattan winds blow from the northeast between November and April, often producing dust storms as winds lift dust particles from the Sahara. During the March 30 event, AEMET noted that conditions were right for a harmattan surge, which happens when winds get stronger near the ground with the passing of a cold front. That day, winds converged perpendicular to the High Atlas mountain range before shifting southwest.

Forecasts called for the Saharan dust to ultimately engulf the Canary Islands, triggering what islanders know as calima. The dust episode was expected to worsen air quality and visibility across the islands through April 1. A separate storm earlier in March also sent dust toward the Canaries, along with another plume that dispersed widely across Europe.

Researchers using NASA data have previously reported that the most intense Saharan dust storms occur in the spring, when dust is typically lifted from the sand seas, or ergs, of central North Africa and areas along the Mediterranean coast. In the warmer months, another peak occurs in the central Sahara.

NASA Earth Observatory images by Lauren Dauphin, using MODIS and VIIRS data from NASA EOSDIS LANCE, GIBS/Worldview, and the Joint Polar Satellite System (JPSS). Story by Kathryn Hansen.

Downloads

March 30, 2026: Terra MODIS

JPEG (2.42 MB)

March 30, 2026: NOAA-21 VIIRS

JPEG (2.01 MB)

References & Resources

• AEMET Divulga via X (2026, March 31) These satellite images show a surge of harmattan, a dust storm (haboob) generated by the harmattan wind from the region. Accessed March 31, 2026.
• CIRA Satellite Library (2026, March 30) Daily loop from: Meteosat-12. Accessed March 31, 2026.
• Fiedler, S. et al. (2015) The importance of Harmattan surges for the emission of North African dust aerosol. Geophysical Research Letters, 42 (21), 9495-9504.
• HESPRESS (2026, March 30) Morocco issues orange alert for cold weather, strong winds, and dust storms. Accessed March 31, 2026.
• NASA Earth Observatory (2026, March 12) Dust Outbreak Reaches Europe. Accessed March 31, 2026.
• Saleh, S.A. et al. (2025) A preliminary assessment of the spatial and temporal patterns of sand and dust storms over the Sahara. Scientific African, 28 (e02729).

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