Yesterday morning had fairly clear skies over the Yukon and Southeast Interior Alaska, which allowed longwave IR (~11 um) energy from the surface to be emitted at nearly that of a blackbody. Brightness temperatures showed up as close to the actual temperatures, though typically brightness temperatures tend to be slightly colder than actual. The image […]
Where is the Coldest Air? Read More »
This VIIRS Daynight Band RGB image is made by incorporating the longwave IR (i05 – 11.5um) and shows the fog in the Yukon-Kuskokwim Delta region early yesterday morning. Lower clouds are typically shown in yellow and higher clouds in blue, but surface temperatures are as cold as the cloud tops in some places, making it
VIIRS DNB RGB Shows Fog in the Yukon-Kuskokwim Delta Region Read More »
In this VIIRS RGB image, the lighter blue colors identify sea spray generated by high winds over water in the narrow channels of southeast Alaska. The orientation of the spray also provides a good indication of where the strongest winds are occurring. This “Sea Spray RGB” was developed by Bill Line from CIRA with input
VIIRS SeaSpray RGB Captures Spray Over Southeast Alaska Waters Read More »
This animation of VIIRS 11.5 um imagery shows the breakup of the Arctic ice pack around Point Barrow and near Utqiagvik with individual ice floes moving west and southwest. The ice pack with numerous fractures and leads has a slower westward drift compared to the smaller individual ice floes. The frequent orbit of polar satellites
Frequent polar satellite imagery from GINA captures ice floes Read More »
This VIIRS DayLandCloud RGB image from Sept 9, 2021 shows the northern extent of GINA’s Direct Broadcast coverage over the Arctic Ocean all the way to the North Pole. VIIRS imagery has a high resolution of 375 meters which is highlighted in the close-up view of the detailed ice structure offshore of Banks Island in
September Ice Structure over Arctic Ocean Read More »
Clouds are covering much of Interior and Northern Alaska after a week of clear weather. This is a DayLandCloud RGB image which is made from three VIIRS satellite bands assigned to red, green, and blue components to produce a false color image. The 1.6 um band is assigned red, the 0.87um band to green, and
Early August Showers in the Northern and Interior Alaska Read More »
A spectacularly clear day over Alaska allows JPSS #VIIRS to see a raft of smoke plumes from interior fires on Aug 4, 2021 (True Color RGBs).
Interior AK Smoke Plumes Read More »
Two images of the VIIRS i04 band (3.74 um) show the change in three days of an early season fire near Kongishluk Bay. The top image is from May 26th and the bottom image is from May 29th using a colormap that enhances the hottest Brightness Temperatures from green to red to yellow. With prevailing
Fire Season Underway in Alaska Read More »
This is a VIIRS i05 Infrared image (11.5 um) at 1245 UTC 08 Feb 2021 with colormap to show the colder temperatures. The legend at the upper left shows how the colors relate to temperature with colder to the right and warmer to the left. The non-grey colors range from -20 to -85 deg F
VIIRS Satellite Image of Cold Air Read More »
