Lake effect cloud plume in northeastern MontanaGOES-16 (GOES-East) Nighttime Microphysics RGB and Day Snow-Fog RGB images (above) showed a lake effect fog/stratus plume that was meandering slowly northward from the still-unfrozen Fort Peck Lake in northeastern Montana (just south of Glasgow) on 08 December 2022.
During the hours leading up to sunrise, GOES-16 Nighttime Microphysics RGB images with an overlay of the GOES-16 Cloud Top Phase derived product (below) indicated that the majority of this lake effect fog/stratus plume had tops consisting of supercooled water droplets.
The GOES-16 Cloud Thickness product (above), a component of the Fog/Low Stratus (FLS) suite, showed that this fog/stratus feature was generally 1000 feet thick or less — confined to a strong but shallow low-level temperature inversion, according to plots of rawinsonde data from Glasgow (below). Once this fog/stratus plume began to move over Glasgow shortly after 1000 UTC, their surface observations revealed frequent fluctuations in the surface visibility, along with periods of freezing fog and occasionally some light snow (below). In addition, these conditions likely had an impact on travel along US Highway 2 (which runs northwest-to-southeast through the Glasgow area).