the winter, but weakens
and spreads northeast during the summer. The highest wintertime precipitation occurs southwest
10
Figure 3. Seasonal mean fields in winter ((a) and (c)) and summer ((b) and (d)). (a) and
(b): daily precipitation (coloured contours), 500 hPa geopotential height in metres (red
contour lines), and 250 hPa geopotential height (white contour lines). (c) and (d): sea
surface temperature
/media/vedurstofan/utgafa/skyrslur/2015/VI_2015_005.pdf
einni
sviðsmynd og líkur á að ákveðnum þröskuldum sé náð eru reiknaðar. Þröskuldirnir eru a) 1 mm
gjóskuþykkt á flugvöllum, en sýnt hefur verið fram á að við meiri gjóskuþykkt fer að draga úr
öryggi við lending flugvéla, b) 3 mm gjóskuþykkt á vegum en þá fara akstursskilyrði að dvína
og c) 10 cm þykk gjóska er viðmið fyrir áhrif á tengivirki og flutningsgetu rafmagnslína.
Niðurstöður sýna að
/media/vedurstofan-utgafa-2020/VI_2020_004.pdf
the mountain, in
particular the settlement near Stöðvarlækur and Búðará, may also be threatened by fast-
moving debris flows from high elevations in Strandartindur that can be affected by
permafrost. There is high hazard, corresponding to the C-zone in the Icelandic hazard
zoning regulation, within the main debris flow paths below Þófi and the eastern part of
Botnabrún to Nautaklauf
/media/vedurstofan-utgafa-2016/VI_2016_006_rs.pdf
to 23 m/s) in most places tomorrow; lighter wind in the south and west until the afternoon. Snow in northern Iceland but some snowshowers in the south. Becoming colder tomorrow, temperatures from zero to minus 5 °C but above zero at the south coast.
On Tuesday: Northwest 13 to 23 m/s, strongest in the northeast. Snow in the north part, but dry in the south. Lighter wind in the west. Temperatures 0
/about-imo/news/nr/2999
well away from the eruption now; all access is restricted. The weather forecast is as follows: Increasing northeast wind and intermittent snow and blowing snow, 18 to 23 m/s by afternoon. Rather slighter northwest wind tomorrow and snow showers. Air temperatures -1°C down to -6°C. Calmer weather is expected on Wednesday.
On April 4th, lava flowing to the west encountered some patches of glacial ice
/about-imo/news/nr/1860
and Hvanná.
Reduced visibility (10 m) and risky weather keep visitors well away from the eruption now; all access is restricted. The weather forecast is as follows: Increasing northeast wind and intermittent snow and blowing snow, 18 to 23 m/s by afternoon. Rather slighter northwest wind tomorrow and snow showers. Air temperatures -1°C down to -6°C. Calmer weather is expected on Wednesday
/about-imo/news/nr/1860/
it was among the 10 warmest recorded, but in
the Northeast and East it was among the 15 warmest. Multi-station temperature measurements
go back to the early 1870s.
In Reykjavik only May had slightly below normal temperatures (1961-1990) and in 7 of the
months the temperature was more than 1.5°C above the normal. April and July were
particularly warm and April registered the highest temperature ever
/media/vedurstofan/utgafa/skylduskil/ved-eng-2007.pdf
was 5.5°C, 1.2°C above the 1961 to 1990 mean. In Akureyri the average was 4.3°C, 1.1°C above the mean. The first three months of the year were particularly warm as were July and August. No month was cold. At the individual stations Surtsey off the southern coast had the highest annual mean temperature, 6.8°C. The lowest annual mean was measured at Brúarjökull, on the lowest part of a glacier
/weather/articles/nr/2614
variability should be
noted. It can mask or exaggerate a moderate long term trend for decades at a time.
The average temperature in Reykjavík was 5.5°C, 1.2°C above the 1961 to 1990 mean. In
Akureyri the average was 4.3°C, 1.1°C above the mean. The first three months of the year
were particularly warm as were July and August. No month was cold. At the individual
stations Surtsey off
/media/vedurstofan/utgafa/skylduskil/ved-eng-2012.pdf
to 36 km
(~7- 32 mi)
head2right ECHAM5 forcing
head2right CCSM3 forcing
(A1B and A2 scenarios)
HadRM
Resolution: 25 km
(~15 mi)
head2right HadCM3 forcing
Land-Atmosphere Interactions
Snow Cover Change Temperature Change
Change in winter temperature (degrees C)Change in fraction of days with snow cover
Wintertime Change from 1990s to 2050s
Salathé et al. 2008
Extreme Precipitation
Change from 1970
/media/ces/Lettenmaier_Dennis_CES_2010pdf.pdf