Cold, dry and sunny weather in the south in Spring, with strong winds these days. Can only mean one thing, dust storm activity on the south coast of Iceland.
Modis image from 24 April 2017 at 12:50 (image courtesy of NASA MODIS/Rapidfire).
Wind speed at Skarðsfjöruviti over 9 m/s around noon, and over 15 m/s at Stórhöfði, Vestmannaeyjar.
Skarðsfjöruviti (image from IMO, vedur.is).
Stórhöfði (image from IMO, vedur.is).
The weather was very good during New Years, calm winds, clear skies and cold.
Therefore, PM10 concentration was expected to reach high values, and it did.
At Grensás, close to downtown Reykjavik, the concentration reached maximum at 01:30, reaching almost 2500 µg/m³. The concentration in the Family-and petting zoo, nearby but with more vegetation and further from apartments, the concentration followed the same pattern, but with lower values. At 01:30 the maximum there reached 1500 µg/m³.
The 24-hour average for 1 January 2017 at GRE was about 160 µg/m³, three times the health limit.
More about the PM during New Year’s Eve in Icelandic: “Svifryksmengun langt yfir heilsuverndarmörkum“
Dust storms occurred, and were visible, on 27 and 28 October 2016.
MODIS image from 28 October 2016 at 13:00.
Wind gusts over 20 m/s on 20 October 2016 north of Dyngjujökull gave rise to re-suspension of dust from the glacier river, Jökulsá á Fjöllum.
Landsat8 image from 12:34 on 20 October 2016 (image from NASA/USGS).
Wind speed measured at Kárahnjúkar (vedur.is). At Upptyppingar on Thursday 20 October at 12:00 the wind speed was 16 m/s with gusts of 21 m/s, 7,3 °C and RH 51 %.
Good weather for dust storms these days here in Iceland, dry and sunny and windy every once in a while.
The MODIS image above (Image courtesy of NASA MODIS/Rapidfire), taken 14:50 on 7 August 2016, show that pretty well.
Quite windy in the SE-Iceland, as one can see from the wind velocity at Kirkjubæjarklaustur.
There was an activity south of Langjökull, slightly visible white/grey plume in the figure, caught by an aerial photographer leikfok við Langjökul (RÙV).
Sunny and windy in the south today, and dust blowing in the area near Eldhraun and also Meðallandssandur.
Fairly strong winds, 11 m/s average wind speed and gusts of 19 m/s at Kirkjubæjarklaustur (Figure 1).
Figure 1. Weather observations at 13:00 on 3 May 2016.
Maybe need to look carefully, but possible to see stuff from the coast and further inland in the area between Kúðafljót and Skaftá, where Meðallandssandur and Eldhraun are (Figure 2).
Figure 2. MODIS image from 3 May 2016 at 13:15 (image from MODIS/Rapidfire).
Despite cloud cover, it is possible to detect some dust blowing out to sea from the area east of Mýrdalsjökull. It is likely that this is the Eldhraun area that was flooded in jökulhlaup in Skaftá in October 2015. In the local news yesterday there was a story about a lot of dust blowing there, but clouds completely obscured the view that day.
The wind pattern is quite complicated, but large scale fits with quite strong northerly winds.
Weather at 15 on 28 April 2016 (from the IMO web-site).
The satellite images show the dust.
12:40 (image from NASA/Rapidfire)
12:55 (image from NASA/Rapidfire)
14:35 (image from NASA/Rapidfire)
The story from yesterday [Dust storm in the flooded area] Sandbylur á flóðasvæðunum. Sandurinn æðir yfir gróður í Eldhrauni við Brest [Dust blowing over vegetation at Eldhraun near Brest]. [Photo] Ljósmynd/Gústav M. Ásbjörnsson