Yesterday at the Nipika Field Site we had a very relaxed start to the day with clear and sunny skies. We arrived on site at 1315 UTC. Hard to believe how warm the sun was at Nipika after hearing about all the snow at the Fortress site over the past few days!
Around noon, a few scattered and broken clouds appeared in the sky and we received light – moderate precipitation from 1730-1750 UTC, during which time we saw a bit of mixed precipitation with some graupel, but it was mostly rain. Skies were mostly overcast throughout the evening and temperatures became cooler. We received very light precipitation for a few short periods during the evening, but nothing particularly noteworthy. We left the site at 0200 UTC on May 8. During the afternoon, Hadleigh and Selina deployed an Odyssey precipitation gauge within the Nipika enclosure. Three other precipitation gauges await deployment in the back of the truck. Hopefully, after a bit more exploration, an elevation transect of precipitation gauges will reveal itself on the edge of one of the valleys near Nipika.
Field participants: Cécile Carton, Selina Mitchell, Hadleigh Thompson & Hilary Smith
André and Aurélie went to Fortress early, leaving around 1220 UTC to catch the first forecasted bit of convection (GEM 2.5) over Fortress Mountain. Upon arrival skies were clear, in fact, the clearest it has been since the beginning of the field project (see photo below).
Much of the day was mixed with scattered convective precipitation starting around 1600 UTC. At 1750 graupel was observed, but had melted too quickly to be photographed. In fact, temperatures throughout the day were not conducive for picture taking. There were also periods of moderate precipitation consisting of large aggregates of dendrites (May 8 0030 UTC). Some of these aggregates were around 2 cm in size, however upon checking the parsivel, none of those larger aggregates were sampled by the instrument.
By May 8 0130, precipitation had slowed down and the Strathmore radar had showed more organized cells and fewer scattered precipitation across the Rockies. We called it quits by May 8 0200 UTC, as skies were clearing to the north and it appeared as though the trajectory of the cells further north would not pass Fortress.
In the evening back at BGI Aurelie and Andre assembled the MRR-pro tripod with the piece that we were previously missing. Now we can deploy the MRR pro remotely!
Field participants: André Bertoncini, Aurélie Desroches-Lapointe, Charlie Hebert-Pinard & Juris Almonte