OpenSciEd
Open Sci Ed: 6.3 Weather, Climate & Water Cycling
This Weather, Climate & Water Cycling unit has students investigating small-scale storms, mesoscale weather systems and climate-level patterns of precipitation.
NOAA
Noaa: Operational Significant Event Imagery
This site contains satellite images from around the world organized by significant events such as dust storms, floods, severe weather, etc. Not very user friendly, but the images are there for those willing to search.