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. Prior to observations, a mixture of rimed snow (needles) and possible freezing drizzle occurred. The precipitations were unrelated to the incoming weather system and were possibly due to the remains of the previous system (event #7) Observations began in the morning at 9:10 on 28 march, very light snow observed at 9:15. The snow continued to fall, lightly at times, until 2:30 on 29 march. At that time, ice pellets mixed with rimed ice crystals were observed. This went on for intermittent periods until 4:50. From 4:50 to 16:00, intermittent snow or light snow was observed. Microphotography was attempted every 10 minutes, but was not always possible if the precipitation melted too quickly or were blown away by wind. During this event, nine weather balloons were launched (at 17:17, 20:13, 21:45, 23:14 UTC on march 28 and 2:21, 5:13, 8:12, 11:31, 14:15 UTC on march 29). Des observations aux 10 minutes ont débuté à 9h45 le 26 mars et se sont prolongées jusqu'à 6h20 le 27 mars. De la pluie a été observée à 14h30 le 26 mars et s'est poursuivie jusqu'à 23h00. À 23h00 de la neige presque complètement fondue a été observée mêlée à la pluie. Entre 23h00 et 23h50 il y avait présence de neige presque complètement fondue ou de neige mouillée. À partir de 23h50 seulement de la neige pouvait être observée. La neige s'est poursuivie jusqu'à 6h10 le 27 mars. De 23h50 le 26 mars jusqu'à 6h00 le 27 mars, de la microphotographie des précipitations solides a été effectuée aux 10 minutes. Pendant cet événement, 9 ballons météo ont été lancés. Six d'entre eux ont été une totale réussite (17:04 UTC, 20:36 UTC, 23:12 UTC le 26 mars et 1:25 UTC, 5:14 UTC, 8:07 UTC le 27 mars). Deux d'entre eux ont été une réussite partielle (20:02 UTC le 26 mars et 3:25 UTC le 27 mars) et l'un d'entre eux a été un échec (2:15 UTC). Observations began in the morning at 8:00 UTC, with the first snow observed at 10:20 UTC. Precipitations above ground were measured by Micro Rain Radar during that time but did not reach the ground until 10:20 UTC. The snow continued to fall, lightly at times, until 14:10 UTC. Microphotography was attempted every 10 minutes, but was not always possible if the precipitation melted too quickly. There was a pause in precipitation for a few hours, and then precipitation resumed from 17:30 to 19:20 UTC (periods of rain, as well as mixed precipitation of rain + snow). During this event, five weather balloons were launched (at 8:08, 11:08, 14:01, 17:15, and 20:16 UTC). Observations began at 4:00 UTC and lasted until 14:10 UTC on 12 March. Rain started at 5:40 UTC and lasted until 6:50 UTC. Observations began again at 5:40 UTC until 8:50 UTC on 13 March. Intermittent snow started around 5:45 UTC and was last observed at 8:30 UTC. Microphotography was only possible for one period of 10 minutes. During this event, three weather balloons were launched (at 2:12 and 5:17 UTC on 12 March and at 8:14 UTC on 13 March). En raison du passage d'une masse d'air chaud au-dessus d'Edmundston tôt en matinée, une alerte d'Environnement Canada de pluie verglaçante est en vigueur. Un ballon-sonde a été déployé 10:42 UTC (durée de 1h37) capturant bien la couche de fonte. Des observations effectuées aux 10 minutes ont débuté à 10:20 UTC et se sont poursuivies jusqu'à 13:30 UTC. Toutes les précipitations observées étaient liquides, aucune microphotographie n'a donc été effectuée. Avant l'arrivée sur le site d'observation (un peu avant 10:00 UTC), de la glace est observée au sol, mais la pluie ne gelait pas au contact des surfaces. De la pluie verglaçante était rapportée par les médias, mais aucune n'a été observée sur le site. La température de l'air à 10:00 UTC était d'environ 1°C, il est donc possible qu'il y ait eu occurrence de pluie verglaçante avant le début de l'observation ou que l'eau ait gelé au sol (dont la température était probablement inférieure à 1°C).
Le sillage de la tempête du 1er mars 2021 combiné avec la contribution d'une importante dépression au large de la Nouvelle-Écosse ont apporté de la neige à Edmundston en début d'avant-midi. Un ballon-sonde a été déployé à 11:01 UTC (durée 1h52). Des observations effectuées aux 10 minutes ont débuté à 11:10 UTC et se sont poursuivies jusqu'à 16:40 UTC. La microphotographie aux 10 minutes des précipitations a débuté à 11:50 UTC et s'est terminée à 15:10 UTC puisque les précipitations fondaient avant de pouvoir être photographiées. Toute la précipitation observée était solide (neige ou neige en grains). Les observations au laboratoire mobile ont cessé après que le radar ait indiqué la fin des précipitations pour la région. Cependant, la neige a repris vers 18:40 UTC et des observations aux 10 minutes ont été conduites à partir d'un appartement au centre-ville d'Edmundston jusqu'à 20:40 UTC. |
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