Individual Great Lake true-color sectors available at the CIMSS Direct Broadcast site

November 4th, 2020 |

VIIRS True Color Imagery from Suomi-NPP (1729 UTC) and NOAA-20 (1818 UTC) on 4 November 2020  over the pre-defined Great Lakes domain (click to enlarge)

The CIMSS Direct Broadcast site is now routinely creating True-Color imagery over 6 different domains: The Great Lakes, and each of the 5 individual lakes: Superior, Huron, Michigan, Erie, Ontario (Click on each image to see the domain). File name examples are shown here. Suomi NPP and NOAA-20 are in similar orbits, about 50 minutes apart, so it’s common to be able to create an animation, as shown below with Lake Erie. Note that the colors in the toggle below, and in the Basin-wide toggle above, can show differences because of view angles. In particular, the slanted view angle over Lakes Michigan and Superior in the 1729 UTC Suomi-NPP image in the toggle above allows for the true-color imagery to show a thin layer of smoke over portions the those lakes.

VIIRS True Color Imagery from Suomi-NPP (1729 UTC) and NOAA-20 (1818 UTC) on 4 November 2020  over the pre-defined Lake Erie domain (click to enlarge)

If NOAA-20 or Suomi-NPP only samples part of the lake, then a partial image is created, as shown below from NOAA-20 pass viewing Lake Ontario at 1639 UTC on 4 November. (NOAA-20 viewed the entirety of Lake Ontario at 1818 UTC).

VIIRS True Color Imagery from NOAA-20 (1639 UTC) on 4 November 2020 over the pre-defined Lake Ontario domain (click to enlarge)

Melting of lake effect snow cover in Pennsylvania

November 4th, 2020 |

GOES-16 “Red” Visible (0.64 µm) images [click to play animation | MP4]

GOES-16 “Red” Visible (0.64 µm) images [click to play animation | MP4]

GOES-16 (GOES-East) “Red” Visible (0.64 µm) images (above) showed a narrow northwest-to-southeast oriented swath of snow cover across far northwestern Pennsylvania on 04 November 2020. With full sunshine and strong southerly winds helping air temperatures warm into the 60s F, this narrow band of snow cover melted by the end of the day. This lake effect snowfall event occurred late in the day on 01 November; lake surface water temperatures across interior Lake Erie (below) were as warm as the middle 50s F (brighter green color enhancement).

NOAA-20 VIIRS Sea Surface Temperature product [click to enlarge]

NOAA-20 VIIRS Sea Surface Temperature product [click to enlarge]

The lake effect snow cover was more apparent in GOES-16 True Color Red-Green-Blue (RGB) images created using Geo2Grid (below) — a 2-day animation covering the daytime hours on 03-04 November showed how quickly much of this snow cover melted on 03 November, with a narrow swath (where 6-12 inches of snowfall occurred) persisting into 04 November. In addition, a thin ribbon of fog in parts of the Allegheny River valley was apparent right after sunrise on 04 November, which quickly dissipated with the onset of daytime heating. The melting remains of the band are also apparent on 4 November in this toggle of VIIRS True Color imagery (from this blog post)

GOES-16 True Color images [click to play animation | MP4]

GOES-16 True Color images [click to play animation | MP4]