Observations in 10 minute intervals began at 15:20 UTC on April 21 and ended at 17:50 UTC on April 23. During this event, a total of 11 weather balloons were launched — 8 successfully (at 17:00 & 23:11 UTC on April 21; 02:12, 05:14, 08:12, 17:11, and 23:16 UTC on April 22; and 05:30 UTC on April 23) and 3 unsuccessfully, due to hardware and software issues. Precipitation began at 15:20 UTC on April 21 as snow, but quickly transitioned to a mix of rain + snow (15:30 UTC) and then to rain (15:40 UTC). The afternoon was characterized by a mix of rain and quickly melting snow. Accumulation of snow on surfaces was observed at 21:00 UTC, with microphotography beginning at 21:10 UTC on April 21. Snow continued, at times light, until precipitation and observations stopped at 17:50 UTC on April 23.
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Observations in 10 minute intervals beginning at 18:20 UTC and ending at 21:30 UTC. Precipitation in the form of rain only. No weather balloons were launched during this event.
Observations at 10 minutes intervals began at 17:20 on 4 April. Very light snow began at 19:08. Snow lasted from 19:40 on 4 April to 1:30 on 5 April. Ice pellets started at 1:10 and lasted until 2:20 with a maximum intensity at around 1:30. Rain mixed with snow and ice pellets started at around 1:40. From 2:30 only rain was observed. Rain lasted until 10:50. Observations ended at 11:20 on 5 April. Microphotography was attempted every 10 minutes during solid precipitations, but was not always possible if the precipitation melted too quickly or bounced off the collection pad. When microphotography was not possible, pictures using a microscope attachment on a smartphone were attempted. During this event, five weather balloons were successfully launched (at 23:22 UTC on 4 April and 2:36, 5:14, 8:09, 11:20 UTC on 5 April). One balloon launch was not successful due to a faulty radiosonde. Observations at 10 minutes intervals began at 18:00 on 31 March, very light liquid precipitation was first observed around 22:00 and was intermittent until 1 April around 4:30. At 4:40 rain started and lasted until 8:10. Snow started at 8:10 and lasted until 14:10. Ice pellets were observed at 13:50 and lasted until 17:10. From that point only light snow was observed until 21:20. Microphotography was attempted every 10 minutes during solid precipitations, but was not always possible if the precipitation melted too quickly or bounced off the collection pad. When microphotography was not possible, pictures using a microscope attachment on a smartphone were attempted. During this event, three weather balloons were launched (at 8:14, 14:15 and 17:09 UTC on 1 April). Dégelis On march 31st 2021, I arrived at Hotel 1212 in Degelis near 6 pm local time. A MRR-2 as well as two infrared cameras were installed in the parking in front of my room door. The MRR-2 was first set up to 100 m resolution and changed, one hour later, to 200 m resolution. Infrared camera IR_1 was set up to point under the truck and IR_2 was set up to point on an open area near the MRR-2. Light rain was first reported near 0040 UTC 1st April. I went to sleep and woke up at 0500 UTC. No precipitation was observed. I woke up again at 0900 UTC and reported light rain. The MRR-2 measurements suggest rain starting at 0600 and 0700 UTC. Wet snow was first observed at 1010 UTC and the photography protocol was initiated at 1030 UTC. Until around 1230 UTC, most snow crystals remained unrecognizable due to melting near the surface, although some plates and dendrites were identified. This first period was characterized by large snow aggregates. At 1240 UTC, needles were reported and remained the main snow habit until the end of the event. Unrecognizable rimed particles were also identified during this period. At 1540 UTC, small frozen droplets were identified. Finally, at 2140 UTC, almost no precipitation was reported and the observation and photographs protocol ended. Snow was observed between 2250 and 2340 UTC but no photo was taken. |
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