River valley fog features on VIIRS Day/Night Band imagery

September 4th, 2012 |
Suomi NPP VIIRS 0.8 µm Day/Night Band image (with surface observations)

Suomi NPP VIIRS 0.8 µm Day/Night Band image (with surface observations)

An AWIPS image of Suomi NPP VIIRS 0.8 µm Day/Night Band data with overlays of surface observations (above) revealed the “dendritic fingers” signature of river valley fog across parts of southwestern Wisconsin and the adjacent Mississippi River Valley region at 08:17 UTC (3:17 AM local time) on 04 September 2012. The moon was in the waning gibbous phase (with 83% of the Moon’s visible disk illuminated), providing ample illumination of the night-time river valley fog features in the middle portion of the image. Additional cloud features could also be seen in other parts of the satellite scene, as well as the brighter signatures of city light across the region.

Strong storm entering the Bering Sea

September 4th, 2012 |
Suomi NPP VIIRS 0.64 µm visible channel images

Suomi NPP VIIRS 0.64 µm visible channel images

AWIPS images of Suomi NPP VIIRS 0.64 µm visible channel data (above) and 11.45 µm IR channel data (below) showed a close-up view of the clouds associated with a strong storm (surface analysis) that was crossing the Aleutian Islands and entering the Bering Sea on 03 September – 04 September 2012. Banded convective elements can be seen along the western edge of the high cloud deck, which marked the leading edge of the advancing occluded frontal boundary.

At the time of the images, the winds at Shemya Air Force Base (station identifier PASY) were gusting to 57 knots (66 mph), but during the previous hour the peak winds were 61 knots (70 mph).

Suomi NPP VIIRS 11.45 µm IR channel images

Suomi NPP VIIRS 11.45 µm IR channel images