Clear skies over the Great Lakes

July 21st, 2022 |
NOAA-20 VIIRS True-Color Imagery along with derived ACPSO SSTs and Surface Buoy Plots, all ca. 1820 UTC on 21 July 2022 (click to enlarge)

NOAA-20’s afternoon path on 21 July 2022 (here, from this site) allowed for a complete view of the Great Lakes, as shown here, and mostly clear skies meant that ACSPO Lake Surface Temperatures were produced; these are here, and also included in the animation above that also includes mid-lake buoy observations. Lake Superior is still quite chilly — surface temperatures over a large part of the lake hover near 40o F! These surface temperature are below normal (link, from this site) Warmest Great Lakes temperatures are (as is also typical) over western Lake Erie, where values are in the low 80s (oF).

Brief flareup of the Moose Fire in Idaho

July 21st, 2022 |

GOES-17 “Red” Visible (0.64 µm, top left), Shortwave Infrared (3.9 µm, top right), Fire Power (bottom left) and Fire Temperature (bottom right) images [click to play animated GIF | MP4]

1-minute Mesoscale Domain Sector GOES-17 (GOES-West) “Red” Visible (0.64 µm), Shortwave Infrared (3.9 µm), Fire Power and Fire Temperature images (above) showed an unusual early-morning flareup of the Moose Fire in Idaho on 21 July 2022. The Fire Temperature and Fire Power derived products are components of the GOES Fire Detection and Characterization Algorithm FDCA.

During this brief flareup, the peak values of Shortwave Infrared, Fire Power and Fire Temperature were a rather modest 83.17ºC, 886.98 MW and 845.37 K respectively — however, the fire was hot enough to produce a notable smoke plume that then drifted southeastward. This flareup apparently occurred during a local increase in terrain-driven wind speeds, around the time that the nocturnal temperature inversion was eroding (which aided in the rapid vertical ventilation of fresh smoke).

GOES-17 True Color RGB images created using Geo2Grid (below) provided a clearer view of the smoke plume as it curled southeastward — along with the ventilation of smoke from nearby valleys that had settled into lower elevations beneath the nocturnal temperature inversion.

GOES-17 True Color RGB images [click to play animated GIF | MP4]