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at bottom right of last image, it is in UTC.
Data from the NWS Ft Worth, TX Nexrad Radar.
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Near Real Time Lightning Display Information
The lightning is displayed as described below.
Lightning Bolt Symbols are newest strikes.
Plus Signs + are older strikes.
There are three sizes of + signs, the smaller the older.
The actual time of strike depends on when the image
was uploaded, it can be a minimum of two minuets
for the Bolts to a maximum of 20 minuets for the
smallest + sign.
The color of the Bolts and Plus Signs + indicate:
White, 1 stroke within about two miles.
Yellow, 2 strokes within about two miles.
Red, 2 to 6 strokes within about two miles.
Purple, 7 or more strokes within about two miles.
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Lightning from United States Precision Lightning Network
(USPLN) through AllisonHouse
Images created using GRLevel3 and AllisonHouse