Weather in the Moscow region on September 13, 2025, was influenced by the southwestern periphery of blocking anticyclone centered over Kirov.

From 5:00 to 7:00 AM Moscow time, Moscow and the Moscow region experienced partly cloudy skies, no precipitation, and patchy ground fog. Temperatures in Moscow ranged from +6 to +10°C, while temperatures in the region ranged from 0 to +8°C. The zero isotherm was at an altitude of 3,600 m, and the -10° isotherm was at an altitude of 5,100 m. Calm and light southeasterly winds of less than 2 m/s were observed. In accordance with the flight plan and based on the meteorological situation, from 6:00 to 7:30 AM Moscow time, the following aircraft were scrambled from Chkalovsky Airport: Yak-40 “Meteo” (number 88164), An-12 (number 94396), and An-26 (number 10) to monitor cloud conditions in the Moscow region and conduct active interventions if necessary.

From 7:00 to 12:00 AM Moscow time, partly cloudy skies remained in Moscow and the Moscow region, with no precipitation. At 12:00, the temperature in Moscow was +17 to +18, and in the region +16 to +18. Wind was easterly, southeasterly, at 1-3 m/s.

From 10:00 to 12:00 AM Moscow time, An-12 (number 25) and An-26 (number 51) were scrambled to replace the previously deployed aircraft, also monitoring the weather conditions in the Moscow region.

From 12:00 to 17:00 PM Moscow time, the weather remained partly cloudy and dry, with temperatures in Moscow ranging from 18 to 19°C and across the region from 17 to 20°C. Winds were southeasterly at 1–3 m/s.

In agreement with the customer, An-26 aircraft (numbers 11, 25, and 28) were scrambled after 15:00 Moscow time to maintain a meteorological monitoring until 21:00 Moscow time.

Aerial work continued until 21:10 Moscow time, after which the customer issued a command to land and dismantle the aircraft. No seeding were carried out on September 13, 2025.