Archive image of the month

The idea behind image of the month is to show interesting weather phenomenon with satellite and radar images.

Record cold in Sweden

The weather situation over Sweden in the beginning of June is cold for the season. The temperature at 14 o'clock, measured at Observatoriekullen in Stockholm, is only +4.7 degree Celcius. The mid day temperature has not been colder than that since 6th of June 1928.

Forest fire over Russia

The summer of 2010 is very hot and dry over large part of Russia. With this metop image it is possible to see the wild fires as browish-redish colour.

First thunderstorms of the season

This years first major thunderstorm day over southern Sweden occur on the 20th of May 2010. The satellite image show how widespread the cumulunimbus clouds are in the afternoon and the radar composite all the showers coming from the clouds.

Satellite image from NOAA15 with channels 1, 2, and 4 from 15.12 utc and the radar composite is from 15.15utc.

The Eyjafjallajökull eruption 11 of May 2010

This satellite image from the Metop satellite show the ash cloud from the volcano Eyjafjallajökull. The ash is seen as a narrow bright stripe.

The image is from 11th of May 2010 with AVHRR channels 1, 3 and 4. Land is seen as green, ocean as dark blue. The red colour at Iceland is snow and ice. Water clouds as yellow and cold ice clouds as pinkish.

Snow cover over Sweden on the 6 of March 2010

The year 2010 started with more snow than usual over the southern Sweden and snow depth records were beaten. 23-25th of February a snow depth of 104 cm where measured in Havraryd at the West coast and this is a new record for the region Halland. Lysekil, also at the West coast, got 3 dm of snow 20-21st of February and this amount from one snow fall event is not common in this region.

However, the Swedish mountains has so far snow depth a bit under the normal. At least in beginning of March.

The RGB image is from 6th of March 2010 12.16utc generated from the NOAA18 satellite. The image is built with the AVHRR channels 3, 4 and 5. The reddish colour means cloud free, green-blue water clouds and whitish is high cold clouds. The picture on the right is the Cloud Type product at the same time as the RGB. The pixels classified as snow (and ice) coloured in pink. The orange over Finland is low water clouds and the blue over the Norwegian sea high cirrus clouds.

The Cloud Type product is one of the products which are developed at the remote sensing group here at SMHI. More information about the Nowcasting SAF project: Automatic cloud analysis - the Nowcasting SAF project.

Track from ice breaker seen in the Sea of Bothnia

February 24th 2010 is cold and clear. This morning, over northern Sweden, many people wake up with -35 or -40 degree Celcius. Naimakka take a new seasonal record low temperature with -42.

However, the interesting which is seen in the satellite image is the track in the ice. Look at Sea of Bothnia (please, enlarge picture) and you can see a straight line from Sea of Aaland to the Quark. This line is made by the ice breakers which help other ships coming and going to Swedish and Finnish harbours. The reason we can't see this track in the Gulf of Bothnia is probably depending on other kind of ice there.

The satellite image is from 12.30 SWT composed with channels 1, 2 and 4 from the NOAA-19 satellite.

The ice condition chart made by the ice service at SMHI. February 24th 2010 is cold and clear. This morning, over northern Sweden, many people wake up with -35 or -40 degree Celcius. Naimakka take a new seasonal record low temperature with -42.

However, the interesting which is seen in the satellite image is the track in the ice. Look at Sea of Bothnia (please, enlarge picture) and you can see a straight line from Sea of Aaland to the Quark. This line is made by the ice breakers which help other ships coming and going to Swedish and Finnish harbours. The reason we can't see this track in the Gulf of Bothnia is probably depending on other kind of ice there.

The satellite image is from 12.30 SWT composed with channels 1, 2 and 4 from the NOAA-19 satellite.

The ice condition chart made by the ice service at SMHI.

Intense low pressure on the 27th of January

January the 27th 2010 an intensive, wide spread and deep low pressure passing Sweden. All regions in Sweden including waters had at least one weather warning. For example heavy snowfall, storm winds or low water levels.

The satellie image is from 13.17 swedish winter time, built with channels 1, 2 and 4 from the NOAA18. The image show how the frontal system stretching from northern Sweden and southbound over the southern part and also Denmark and northern Germany.

The radar composite, from 13.15 SWT, show the snowfall from Tornedalen and south to Skåne and Denmark.

Winther Solstice 21 of December 2009

This satellite image is from the 21st of December 2009, i.e. the winter solstice. The shortest day and longest night at the northern hemisphere.

The satellite image is composed by two visual channels and one IR channel. North of the Polar Circle, at latitude 66 north, sun rays don't reach and it is night all day. In this image you can see this as the bluish part which is also only information from the IR channel 10.8 micro meter.

This overpass is from 1236 utc. Winter solstice 2009 at 1747 utc.

Snowcover 5th of October 2009

With this satellite image the snow cover is detectable as the pinkish colour in the mountains but also further east over parts of Dalarna and Norrland in Sweden. Pinkish colour over the sea, lake Vänern and in the northeast represent ice particles in the clouds.

The image is taken by the NOAA17 polar orbiting satellite at 09.34utc the 5th of October.

Seebreeze over Denmark and southern Sweden

A sunny day over Denmark and southern Sweden in may means a day with sea breeze. The sun heats up the land and the temperature contrast between land and sea is favourable for the weather phenomenon sea breeze.

The satellite image show cloud formation few or severeal kilometers from the coast line.

This image is taken from the polar orbiting satellite NOAA19 with a passage over Sweden the 22nd of June 13.52 cet.

Sunny Whitsun weekend

A high pressure with lots of sun over Scandinavia the last days in May 2009. On the 31st of May, Piteå city in northern Sweden, have the highest temperture in Sweden with 29.5 degree C. A cold front from the west is seen in the satellite image as blue-white clouds over north-western Scandinavia.

This RGB image is taken from the polar orbiting satellite NOAA19 with passage 31st of May at 12:16 UTC. The image is built on the AVHRR channels 1, 2 and 4 or 0.6, 0.8 and 10.8 micrometer.

Low pressure passing Gotland 24 of March 2009

A small but intense low pressure passing Gotland on the 24th of March 2009. The low pressure developed over northernmost Baltic during the night and moved south. Both winds and precipitation created problems on the island with delayed or cancelled buses and also interruption within the power lines.

Highest wind speed was observed from Fårösund at ten o'clock with 24 m/s and a few hours later at one o'clock

Satellite image from the american polar orbiting satellite NOAA 15 with channels 1, 2 and 4 or 0.6, 0.8 and 10.8 micrometer.

Extensive low pressure passing Sweden 24 of November 2008

This satellite image show the weather situation over Scandinavia on the 24th of November 2008 at 01.38 CET. An extensive low pressure system with center over Estonia and the Gulf of Finland. At this night wind speed up to hurricane strength where reported from southern Sea of Bothnia. Over county Uppland lots of snow was falling which increased the snow depth with about halv a meter.

The satellite image is taken from the polar orbiting satellite NOAA 18 and the RGB is composed with channels 3B, 4 and 5 or 3.7, 10.8 and 12.0 micrometer.