A cyclone off the Pacific Northwest coast was maturing and entering the occluded stage on 23 February 2009. An animation of  GOES-11 and  GOES-13 water vapor channel imagery (above) showed a very compact “dry swirl” signature that often signals a cyclone’s transition... Read More

The first tornado-related fatalities of the 2009 severe weather season occurred during a tornado outbreak that affected parts of Texas and Oklahoma (SPC storm reports) on 10 February – Read More

AWIPS images of the 4-km resolution GOES-11 fog/stratus product and the 1-km resolution MODIS fog/stratus product (above) showed widespread fog and stratus clouds in the central valleys of California as well as over the adjacent offshore waters of the Pacific Ocean on 08 January 2009. With the finer spatial resolution of the... Read More

AWIPS images of the GOES-11 6.7 µm water vapor channel (above) showed a very long and well-defined plume of moisture streaming northeastward from just north of the Hawaiian Islands to the Pacific Northwest on 07 January – 08 January 2009. The National Weather Service forecast office in Seattle,... Read More