GOES-14 Super Rapid Scan images of valley fog in West Virginia

August 14th, 2013 |
GOES-14 0.63 µm visible channel images (click image to play animation)

GOES-14 0.63 µm visible channel images (click image to play animation)

An animation of 0.63 µm visible channel images (above; click image to play animation; also available as a QuickTime movie) from the GOES-14 satellite (which was in SRSO-R mode, providing images at 1-minute intervals) captured the dissipation of nocturnal valley fog across West Virginia and parts of adjacent states on the morning of 14 August 2013. The haziness seen across the southern quarter of the images was due to a layer of smoke aloft, transported from large fires which had been burning in the northwestern US.

About an hour prior to the first 11:20 UTC GOES-14 visible image above, a comparison of 1-km resolution POES AVHRR and 4-km resolution GOES-13 IR brightness temperature difference “Fog/stratus product” images (below) demonstrated the advantage of higher spatial resolution for the accurate detection of such small-scale features at night (before visible imagery becomes available). Map outlines have been removed, but the image is centered over West Virginia; the darker signature of the Ohio River (winding from northeast to southwest) can best be seen in the POES AVHRR image.

POES AVHRR and GOES-13 IR brightness temperature difference

POES AVHRR and GOES-13 IR brightness temperature difference “Fog/stratus product” images

 

GOES-14 SRSO-R Views of Convection over Montana

August 14th, 2013 |
GOES-14 and GOES-15 0.62 µm Visible images (click image to play animation)

GOES-14 and GOES-15 0.62 µm Visible images (click image to play animation)

SRSO-R GOES-14 1-minute imagery shows the dynamic nature of the cirrus canopy over developing convection. Strong convection over Montana includes multiple overshooting tops that are visible in the GOES-14 imagery. Routine GOES-15 imagery, also shown, lacks the temporal resolution to capture the growth and decay of many cloud-top features. This is especially true every three hours when a full-disk image is scanned (at 0000 UTC, for example), and at times when satellite housekeeping precludes scanning (at 0045 UTC in this case). The 10.7 µm imagery, below, tells a similar tale. Cold cloud tops appear and vanish at time scales that are not resolved by present operational capabilities.

GOES-R will allow for simultaneous full disk scanning and RSO scanning at the mesoscale.

GOES-14 and GOES-15 10.7 µm IR images (click image to play animation)

GOES-14 and GOES-15 10.7 µm IR images (click image to play animation)