Synoptic conditions in the Moscow region on June 12, 2021 were determined in the surface layer by a low-moving area of low pressure over the center of the ETR and the passage from south to north of the axis of a high-altitude trough.

At the night and morning hours, precipitation zones with an intensity up to 10-20 mm/h moved through Moscow and the Moscow region from the southeast to the northwest.

In accordance with the flight plan and based on the meteorological situation at 04:08 MSK the aircraft laboratory Yak–42D «Roshydromet» (b/n 42440) was launched from the Chkalovsky airfield to sound the atmosphere, monitor the cloudy situation to southeast of Moscow and, if necessary, carry out seeding of the observed multilayer stratus clouds.

From 7:00 to 9:01 MSK, an AN-26 weather aircraft (b/n 50) and two AN-26 aircrafts (b/n 24 and b/n 30) were launched to carried out observations of clouds to the south, southeast and east from the city.

After 10:00 MSK aircraft monitored the meteorological situation from the windward side (in areas limited by azimuths 115-190⁰) at distances of 55–95 km from the city, and also carried out seeding of convective clouds with PV-26-01 flaresfrom the aircraft Yak-42D «Roshydromet» at distances up to 190 km from the city.

Figures 1 — 3 show meteorological information in the Moscow region at 14:30 MSK according to the METEOSAT-9 satellite and radar system.

During the day, zones of intense convection were located in the south and south-east from Moscow and convective cells with heavy rainfall moved towards the city.

By agreement with the Customer, the aviation works were completed at 17:00 MSK.

A total of 7 flights were carried out during the work on June 12, 2021.

Precipitation in Moscow on June 12, 2021 was not observed.

Fig. 1. Satellite image of clouds for 14:30 MSK on June 12, 2021.

Fig. 2. Digital map of the radio echo height at 14:30 MSK on June 12, 2021.

ig. 3. Digital map of precipitation intensity at 14:30 MSK on June 12, 2021.