Aviation Forecast - South Georgia
Stromness - 28 February 2013 - made 1115utc

1. Synoptic situation
A frontal system, associated to a depression that is situated East of the Antarctic Peninsula,
will cross South Georgia during the next 4-6 hours. This front is followed by an very unstable
air mass in an increasingly strong wind pattern. Tomorrow the unstable airmass is gradually
moving away to the East whilst a high pressure system builds over the Antarctic Peninsula.
This will introduce a gradual weather improvement.

2. Weather conditions
Very cloudy becoming overcast with rain/sleet until approximately 14-16utc.
Gradually a few breaks and a mix of dry spells and a few showery outbreaks.
After 00utc increasinly more intens and frequent showers.
Heaviest showers between 4 and 12utc.
After 12utc again bewoming better with a few sunny spells but still some showery outbreaks.

3. Clouds
6-8/8 Stratus and Stratocumulus base 500/1000ft tops 5/6000ft
becoming from 14-16utc 4-6/8 Stratocumulus and Cumulus base around 1000ft tops 2-3000ft
becoming from 04-06utc 7-8/8 Cumulus/Cb up to 16-18000ft
becoming from 12-14utc 4-6/8 Stratus and Stratocumulus, base around 1500-2000ft tops 3/4000ft

4. Wind
12utc till 00utc: 170-190 degrees true/10-15kt average
00utc till 12utc: veering to 270-290 true/increasing to 15-20kt average gust 30-35kt
12utc till 00utc: 230-250 true/increasing to 25-30kt average - gusts up to 40-45kt

5. Upperwinds - 1500ft
12utc till 00utc: 160-180 degrees true/10-15kt average
00utc till 12utc: veering to 270-290 true/increasing to 25-30kt average
12utc till 00utc: 240-260 true/increasing to 40-45kt average

6. Visibility
poor during rain/sleet becoming good behind the front, tempo moderate in showers.
during moderate to heavy showers visibility can become poor again.
In between the showery outbreaks good visibility.

7.Hazards in flight
-icing: in clouds moderate
-turbulence: light today but becoming moderate to severe in increasing wind/instability pattern

9. General evolution for the next days
Saturday:
weather: mix of sunny spells and patches of Stratus around the mountains-increasing cloudiness after 18/21utc
wind: WSW average 28-33kt

Sunday
weather: overcast/rain-sleet becoming variable with a few sunny spells but also showery outbreaks
wind in general from Westerly directions, around 30kt average

Monday
weather: sunny spells and mainly dry - increasing cloudiness after 18utc
wind: from westerly directions around 25kt

weather4expeditions.com supports the South Georgia Rat Eradication Project with daily weather forecasts

[View with PicLens]

As from 28 February weather4expeditions.com will concentrate on the meteorological conditions of South Georgia, a sub Antarctic island South East of the Falkland Islands.
For the next few months a highly motivated team works on this wonderful island in order to extinguish the brown rats and restore the orignal habidat
weather4expeditions makes daily aviation forecasts for a team of three helicopters so the can operate safely.

Via www.weather4expeditions.com you can find out more about this project.