Ice in Hudson Bay and the Northwest Passages

August 7th, 2022 |

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

GOES-16 (GOES-East) True Color RGB images from the CSPP GeoSphere site (above) showed patches of remnant thick first-year ice in southern Hudson Bay, Canada (off the coast of Ontario) on 07 August 2022. The diurnal tide cycle within Hudson Bay was evident in the ice motion during the period 1230-2020 UTC.

Farther to the north, a similar tidal ebb and flow of ice within the Northwest Passages was also seen in a longer animation from 1200-2150 UTC (below).

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

A map of Ice Concentration Departure From Normal from the Canadian Ice Service (below) indicated that a significant portion of the ice concentration in southern Hudson Bay was above normal for the date (darker shades of blue) — while most ice in the Northwest Passages was closer to normal concentration.

Ice concentration departure from normal on 01 August [click to enlarge]

Record 24-hour rainfall in Sioux Falls, South Dakota

August 7th, 2022 |

GOES-16 “Clean” Infrared Window (10.35 µm) images [click to play animated GIF | MP4]       

1-minute Mesoscale Domain Sector (from 0600-0800 UTC) and 5-minute CONUS Sector (from 0801-1301 UTC) GOES-16 (GOES-East) “Clean” Infrared Window (10.35 µm) images (above) showed clusters of thunderstorms that developed and moved eastward across parts of South Dakota, Minnesota and Iowa on 07 August 2022. In fact, these storms contributed to a new 24-hour rainfall record (5.44 inches) being set at Sioux Falls, South Dakota. Much of this record rainfall occurred during the 0600-1300 UTC period shown by the GOES-16 imagery.

Shortly after flash flooding had been reported in Sioux Falls, a toggle between NOAA-20 VIIRS Infrared (11.45 µm) and GOES-16 ABI “Clean” Infrared Window (10.35 µm) images valid at 0826 UTC (below) revealed that the coldest NOAA-20 cloud-top infrared brightness temperatures near Sioux Falls at that time were -83ºC, compared to -74ºC with GOES-16 (identical color enhancements were applied to both images). The northwestward shift in GOES-16 image cloud-top features was associated with parallax (which in this case was a distance of 22 km for a cloud-top height of 50,000 feet).

NOAA-20 Infrared Window (11.45 µm) and GOES-16 “Clean” Infrared Window (10.35 µm) images valid at 0826 UTC [click to enlarge]  

The MIMIC Total Precipitable Water product at 0300, 0600, 0900 and 1200 UTC — visualized using RealEarth — is shown below. TPW values near Sioux Falls peaked at 57 mm (or 2.24 inches) at 0900 UTC.

MIMIC Total Precipitable Water product at 03, 06, 09 and 12 UTC (with plots of surface fronts/troughs) [click to enlarge]