EVENT DESIGNATORS (TTTTT)

Dust Storms Fires
DST - Used for every image depicting airborne dust or sand. FHS - Used for every image depicting heat signatures (hot spots) related to fire activity.

FSM - Used for every image depicting smoke plumes, clouds or haze related to fire activity.

FSMHS - Used for every image depicting smoke and hot spots together.

Floods Ice
FLD - Used for every image depicting flooding or the consequences of floods. ICL - Used for every image depicting ice on land from an ice storm.

ICW - Used for every image depicting ice on water such as ice bergs, ice shelves, etc.

Severe Weather Snow Cover
SVR - Used for every image depicting severe thunderstorms whether they produce tornadoes or not.

TOR - No longer in use. Previously used for images depicting tornadic thunderstorms. The question of whether or not the storm officially produced a tornado is something that is decided after the storm passes. Because this might have lead to inconsitencies in labeling, the prefix TOR was retired.

SNW - Used for every image depicting snow cover.
Storms Tropical
STM - Used for every image depicting large(synoptic)-scale low pressure systems. This tag previously included thunderstorm complexes but those images have been moved to the SVR classification. TRC - Used for every image depicting warm-core tropical systems including hurricanes, typhoons and developing systems.
Volcanic Unique
VIR - Used for every image depicting heat signatures (hot spots) from volcanic activity.

VSH - Used for every image depicting ash clouds resulting from the eruption of a volcano.

VOL - No longer in use. Previously used for images depicting any kind of volcanic activity. Classifications changed to be more specific.

UNI - Used for every image depicting an event which is not classifiable under any event directory or for images depicting many events which are not related to one central event.
TOMS-EP Channel Differencing
TOMS - Used for every Total Ozone Mapping Spectrometer - Earth Probe plot. Because of the various phenomena the TOMS can detect, these images can be found in the "Dust", "Fires" and "Volcano" directories. DIF - Used for every image in which the "split-window" channel differencing technique was employed to highlight the event. Because this technique enhances the appearance of airborne silicates, this imagery can be found in the "Dust" and "Volcano" directories.