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The following was established on the basis of an analysis of the available
meteorological information:
On July 8, 2006 the crew of the А-310 airplane performed pre-flight
meteorological preparation correctly and decided to take off from Moscow to
Irkutsk. The time of departure from Domodedovo was 17:17.
The actual weather at Domodedovo airport at 15:00 on July 8, 2006 was
as follows: wind 220 degrees - 2 m/s, visibility 10 km, cloud cover - scattered
cloud at 1500 m, cumulonimbus, temperature 26 degrees, dew point 12 degrees,
pressure 1020 gPa, recent storm. Forecast for landing: occasional visibility 2000
m, storm with moderate rain.
Final Report
INTERGOVERNMENTAL AVIATION COMMITTEE
33
Weather forecast at Domodedovo airport from 13:00 to 21:00 on July 8,
2006: surface wind - 220 degrees - 6 m/s, visibility 10 km, cloud cover -
diffused at a height of 900 m, occasional visibility 200 m, storm with moderate
rain.
Along the flight route there were no hazardous events forecasted whose
avoidance would have been impossible. The weather forecast along the route to
follow via the airports at Ekaterinburg, Kemerovo, Tolmachevo and
Yemelyanovo was also provided to the crew before the flight and met the
conditions for authorizing departure.
According to АТ700 at 12:00 on July 8, 2006 at the altitude of the leading
airstream, the region around Irkutsk airport was under the influence of the
northern periphery of a cyclone whose center was south of Ulan Bator. Currents
at 080 degrees and traveling at 40-50 kph were observed over regions of Irkutsk.
The currents were not expected to change during the course of the day. The
weather near the surface of the ground in the region of Irkutsk airport was
determined by the rear part of a cyclone whose center was south of Ulan Bator.
A cold front with waves was situated along the eastern shore of Lake Baikal and
further to the south-west towards the regions of Mongolia. The front was clearly
indicated in the field of weather elements. The AT850 for 12:00 on July 8, 2006
showed that the temperature contrast in the area of the front was 12 degrees at
500 km. Satellite data for 22:58 on July 8, 2006 showed that the area of Irkutsk
airport was at the northern periphery of a cloud mass, in an area of thick
stratified cloud cover interspersed with cumulonimbus clouds.
The actual weather and weather forecast at the destination and diversion
airports:
The weather at Irkutsk airport at 15:00 on July 8, 2006: surface wind 310
degrees - 8 m/s, visibility 5500 m, weak showers, cloud cover - unbroken at an
altitude of 240 m, cumulonimbus, temperature 12 degrees, dew point 11
degrees, pressure 1004 gPa, forecast for landing "without changes", friction 0.5.
Weather forecast at Irkutsk airport from 16:00 to 04:00 on July 8, 2006:
surface wind 300 degrees - 10 m/s, visibility 2000 m, moderate showers, cloud
cover - significant at an altitude of 150 m, cumulonimbus, turbulence - moderate
outside of clouds, frequent in the layer above ground of up to 300 m,
occasionally from 16:00 to 02:00: visibility 1100 m, cloud cover – significant, at
an altitude of 90 m, significant cumulonimbus, cloud base 150 m.
Information from SIGMET no. 2, valid from 08:00 to 22:00 on July 8,
2006: along the flight information region (FIR) of Irkutsk the forecast was
hidden storms with cloud tops of up to 390 (flight level) over the entire flight
information region, shifting to the north at a velocity of 20 kph without changing
intensity.
The weather at Bratsk diversion airport at 15:00 on July 8, 2006 was as
follows: surface wind 300 degrees - 6 m/s, visibility 5000 m, cloud cover -
complete at an altitude of 450 m, cumulonimbus, temperature 12 degrees, dew
Final Report
INTERGOVERNMENTAL AVIATION COMMITTEE
34
point 10 degrees, pressure 1006 gPa, forecast for landing "without changes",
friction 0.6.
Weather forecast at the diversion airport of Bratsk from 16:00 to 04:00 on
July 8, 2006: surface wind 280 degrees - 6 m/s, with gusts of 12 m/s, visibility
5000 m, weak showers, cloud cover - significant cumulonimbus, cloud base 180
m, complete at an altitude of 3000 m.
Weather data for flights at Irkutsk airport is provided by Irkutsk AMS,
which is part of the autonomous noncommercial organization Irkutskoye
Meteoagentstvo on the basis of the following:
1. Civil Aviation Meteorological Manual 95;
2. License no. R/2002/0272/100/L of August 12, 2002
3. Charter of the autonomous noncommercial organization Irkutskoye
Meteoagentstvo
4. Regulations governing the Irkutsk AMS;
5. Instructions for providing meteorological data for flights at Irkutsk
　
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