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Posts by Ragnar Heiðar Þrastarson

Weather observations for two stations

Weather observations for two stations

Wind and gust for a single station

Wind and gust for a single station

temperature for a single station

temperature for a single station

5 highest and lowest temperatures for the past 1 hour

5 highest and lowest temperatures for the past 1 hour

Today is world meteorological day #worldmetday 🌦️

DYK that the Icelandic Met Office has an API for weather observations. I´ve been having lots of fun building weather info screens for my new @trmnl.com a brilliant little ePaper info screen

Our API: api.vedur.is/weather/

More on TRMNL: trmnl.com

4 weeks ago 5 2 0 0
Preview
Avalanche | Forecast The Icelandic Meteorological Office publishes information on weather forecasts, severe weather warnings and weather observations for the public and emergency responders.

Check out public beta:
gottvedur.is/snjoflod/en/

4 months ago 2 0 0 0
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Another milestone for us at Icelandic Met Office 🎉

This week we launched a new site with #avalanche forecasts/conditions, incl. recent avalanches. A major update was required in the background, migrating to #Postgres, building APIs and of course the website handled by our friends at Origo & Metall.

4 months ago 13 1 1 0

Every 3 hrs. we produce 219 tile-sets. This makes up a 3-day forecast with wind, temperature and precipitation and deliver that to our users. Then we rinse and repeat.

This pipeline uses @maptiler.bsky.social Engine + Upload API + Cloud + SDK JS with Weather+ with great success and stability.

4 months ago 5 3 0 0
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November is my favorite time to look at #Sentinel2 images of Iceland. All the long shadows draw out the landscape is we are just about to hit the dark months in the visual spectrum acquisitions.

#iceland #glacier #remotesensing #copernicus

5 months ago 7 0 0 1

Had a great time with MapTiler team at Connect 2025!

Truly inspiring to see what is being built and delivered. Also great to get a chance to give positive feedback from us at The Icelandic Met Office

6 months ago 5 2 0 0

Very excited to be part of MapTiler Connect 2025 🤩

We at The Icelandic Met Office together with our friends at Origo have been busy building lots of maps with MapTiler 🗺️

Registration is open for online attendance ✔️

6 months ago 3 1 0 0
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Before and after #flood
A pair of #Sentinel2 satellite images acquired on the 20th of August and 8th of September showing the lake where a glacial outburst flood aka #GLOF aka #Jökulhlaup occurred at the margin of #Langjökull glacier.
Check previous post for a short video from the field.

7 months ago 7 1 0 0
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Throughout #Iceland the Icelandic Met Office operates small web cameras. These are co-located with other equipment like #GNSS and #Seismic stations. They are our eyes in the field. Some capture stunning #nofilter 24h time-lapse like this one looking West towards our old friend #Eyjafjallajokull

7 months ago 8 3 0 0
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A nice #Landsat brightness temperature image from last night (ascending path). Data clipped to a union of all 9 lava outlines with the latest one on the right. Calculated from band 10 (level 1). Hotspots by the main crater and the thickest part of the lava field.

#NASA #USGS #Svartsengi #eruption

7 months ago 6 1 0 1
Hafrafellslón - jökulhlaup í ágúst 2025
Hafrafellslón - jökulhlaup í ágúst 2025 YouTube video by Ragnar Heiðar Þrastarson

A few days ago, we had a glacial outburst flood AKA Jökulhlaup. The water originated from an ice dammed lake by Langjökull glacier. The flood did not cause any issues downstream, but its mechanics are interesting since water flows both beneath and on top of the glacier.
A short vid from the field 👇

7 months ago 4 2 0 0
The most significant May heatwave ever recorded in Iceland | News | Icelandic Meteorological office

Icelandic Met Office: en.vedur.is/about-imo/ne...

10 months ago 1 0 0 0
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In May #Iceland was hit by a significant #heatwave

Several stations exceeded 20°C for 10 consecutive days 🔥

New record for maximum May temperature was set on the 15th, 26.6°C 🌡️

This is #EUMETSAT #MTG satellite images for those 10 days at 10 min interval (geo color image) 🛰️

More info in comment👇🏻

10 months ago 1 0 1 0
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Natural color image for the same scenes (bands 2, 3 and 4). Note the clouds/fog and how they affect the brightness temperature.

11 months ago 2 0 0 0
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Ascending orbits for visual spectrum #satellite images are usually not of interest for most (nighttime images). But for high latitudes in early summer, they can give great results 😍

This is #Landsat9 brightness temperature from band 10 at 22:30 UTC last night over #Iceland

Darker is colder 🌡️

11 months ago 8 4 2 1
Satellite image of Iceland

Satellite image of Iceland

More stunning acquisitions by #sentinel3 of #Iceland from today. The last couple of days have been exceptionally warm with many stations showing more than 20°C.

11 months ago 21 7 1 1
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This spectacular image of #Iceland was acquired by #Sentinel3 last Saturday. Perfect conditions to hike on top of #Snæfellsjökull glacier with some friends.

The latter part of winter was warm and light in terms of snowfall. The April mean temperature was also one of the hottest on record (4/180).

11 months ago 9 1 0 0

Yes, these are all available from the Natural Science Institute of Iceland #GeoServer that will deliver these in many formats, including #KML

Go to gis.natt.is/geoserver/web
-> Layer Preview
-> Search for "goslok"
-> Hit KML link

Enjoy #free #open #data (CC BY 4.0)

1 year ago 3 1 2 0
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And there we have it. The 8th eruption from the #Svartsengi magma reservoir. By far the smallest one in terms of eruption time, area and volume.

Updated lava comparison map that also includes the #Fagradalsfjall eruptions.

#Iceland #QGIS #eruption

1 year ago 42 12 3 0
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On helicopter duty this morning 🌋

Collaborative effort 🤝

- Veðurstofa Íslands - Icelandic Met Office
- Institute of Earth Sciences, University of Iceland
- Icelandic Coast Guard
- Iceland Civil Protection

#eruption #iceland #grindavik

1 year ago 74 17 0 2
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Hello Sentinel-1C 👋🏻🛰️

We have a new #Sentinle1 #SAR satellite delivering data. 1C has joined 1A in orbit and data is now available. Here is an IW mode image from this morning of #Iceland - VV polarization with logarithmic scaling (good for surface roughness). Images from #Copernicus Browser 🙏🏻😍

1 year ago 9 0 0 1
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Some field work today with Civil Protection near #Grindavik and #Svartsengi

Looking at lava barriers and cleaning some webcam lens covers. Trying to be as prepared as possible for the next one 🌋

1 year ago 12 2 1 0
A globe map showing areas around Iceland

A globe map showing areas around Iceland

A map showing areas around Iceland

A map showing areas around Iceland

There are so many nice #QGIS plugins available. Check out Globe Builder. Need an orthographic projection view of your data? Done!

These are the different weather forecast models used by The Icelandic Met Office + subsets. IG and DINI are jointly operated with Denmark, Ireland and Netherlands 🤝🏻

1 year ago 6 1 0 0
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A nice von Kármán vortex street south of Jan Mayen today 😍🌀🌪️

Image acquired by #Sentinel3

👉🏻 en.m.wikipedia.org/wiki/K%C3%A1...

1 year ago 2 0 0 0
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Hello Sentinel-2C 👋🛰️

Images from the recently launched @esa.int third #Sentinel2 satellite are now available. Some winter wonderland images from #Iceland acquired yesterday over the Northeastern highlands.

📸 Lake Mývatn
📸 Jöklusá á Fjöllum glacier river
📸 Askja volcanic caldera & lake

1 year ago 32 10 0 0
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Very excited to announce early public beta of our new website at The Icelandic Met Office. @maptiler.bsky.social plays a key role in delivering maps for the new site. The weather charts use their Engine + Cloud + Weather SDK with the front-end handled by our friends at #Origo -> gottvedur.is

1 year ago 12 4 0 0
Öræfajökull

Öræfajökull

Eyjafjallajökull

Eyjafjallajökull

Post image Glacier cauldron

Glacier cauldron

During volcanic eruptions in #Iceland the scientific community relies on The Icelandic Coast Guard for support during the first phase of events. Their fleet includes a #Bombardier Dash-8 turboprop equipped with a side-looking radar + camera systems. Today we did some training looking at volcanoes.

1 year ago 9 1 0 0
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Hi #GISchat 📢

Tomorrow I´ll be leading a #QGIS course for my Met Office coworkers, first group out of 3!

Do you have any fun geometry generators for my course? I have a few practical examples but need some funny ones to show that there are no limits (except your imagination).

1 year ago 1 0 0 0

I should perhaps decrease my coffee consumption ☕
Here are the same images with the correct timestamp!

1 year ago 1 0 1 0
Magmatic intrusion at considerable depth beneath Grjótárvatn likely | News | Icelandic Meteorological office

More details in English on the recent #earthquake activity on the #Snæfellsnes peninsula. Data suggests magma intrusion at a considerable depth. No deformation has been observed.

en.vedur.is/about-imo/ne...

1 year ago 5 1 0 0