Weather
A METAR (weather observation) for Pearson was released almost exactly at the time of the accident. It stated that the weather at 20:04 UTC (16:04 EDT) consisted of winds from 340° true (north-northwest) at 24 kn (44 km/h) gusting to 33 kn (61 km/h), with 11⁄4 miles (2.0 km) visibility in heavy thunderstorms and rain. The ceiling was overcast at 4,500 feet (1,400 m) above ground level with towering cumulus clouds. The temperature was 23 °C (73 °F). According to the Canada Air Pilot, runway 24L has a heading of 227° true (237° magnetic), and the minima for the ILS approach are ceiling 200 feet (61 m) above ground level and visibility 1⁄2 miles (0.80 km) or runway visual range (RVR) of 2600. The METAR for 21:00 UTC (17:00 EDT), nearly an hour after the accident, shows wind backing to the south and improving conditions generally, but includes "FU ALF" in its remarks to indicate smoke aloft from the burning plane.
The Canadian Broadcasting Corporation reported that the crash occurred two hours after a ground stop was declared at the airport because of severe thunderstorms in the area ("red alert" status, which, for safety reasons, halts all ground activity on the apron and gate area. Aircraft can still land, and take off if still in queue). Visibility at the time of the accident was reported to be very poor. There was lightning, strong gusty winds, and hail at the time and the rain just began as the plane was landing. Within two hours the winds increased from 5 to 30 km/h (3 to 20 mph) and the temperature dropped from 30 to 23 °C (86 to 73 °F). A severe thunderstorm warning was in effect since 11:30 a.m. and all outbound flights and ground servicing operations had been canceled but landings were still permitted.
Read more about this topic: Air France Flight 358
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