Swath of snow cover across parts of Virginia and North Carolina

December 5th, 2010 |
MODIS 0.65 µm visible image + MODIS false-color Red/Green/Blue (RGB) image

MODIS 0.65 µm visible image + MODIS false-color Red/Green/Blue (RGB) image

A comparison of AWIPS images of MODIS 0.65 µm visible channel data and a MODIS false-color Red/Green/Blue (RGB) image (created using the MODIS 0.65 µm visible and the 2.1 µm snow/ice channel images) revealed a swath of snow cover from southwestern Virginia all the way to extreme eastern North Carolina on the morning of 05 December 2010 (above).

Storm total snowfall amounts were as high as 3.0 inches with this event, which occurred on 04 December. While only two first-order stations (Greensboro KGSO and Raleigh KRDU) reported 1 inch of snow on the ground at 12 UTC on the morning of 05 December, the MODIS imagery showed that snow cover (which appeared as shades of red on the false-color RGB image) still remained across a number of counties to the east and southeast.

Better detail of the swath of snow cover across North Carolina can be seen using a 250-meter resolution MODIS true-color RGB image from the SSEC MODIS Today site (below; viewed using Google Earth).

250-meter resolution MODIS true-color Red/Green/Blue (RGB) image

250-meter resolution MODIS true-color Red/Green/Blue (RGB) image

“Hot spot” from the eruption of the Tungurahua volcano in Ecuador

December 4th, 2010 |
GOES-13 (left) and GOES-12 (right) 3.9 µm shortwave IR images

GOES-13 (left) and GOES-12 (right) 3.9 µm shortwave IR images

McIDAS images of GOES-13 and GOES-12 3.9 µm shortwave IR (IR channel 2) data (above) revealed the “hot spot” (yellow to red color enhancement) due to the eruption of the Tungurahua volcano in the South American country of Ecuador on 04 December 2010. The summit of the volcano is located south-southeast of the city of Latacunga (station identifier SELT). According to an ash advisory issued by the Washington DC Volcanic Ash Advisory Center (VAAC), ash was estimated to be extending upward to altitudes about 26,000 feet around this time.

Note that at times there are sight differences in the size and intensity of the volcano hot spot, due to the different viewing angles from the GOES-13 satellite (located at 75º West longitude) and the GOES-12 satellite (located at 60º West longitude). Also note the improved image navigation and registration (INR) with GOES-13, which keeps the volcano hot spot centered at the same location during the image animation.