Fall Thunder.
Thunder in the fall indicates a mild, open winter.
February Thunder.
Thunder and lightning in February or March, poor sugar (maple) year.
First Thunder.
The thunder-storms of the season will come from the direction of the first thunder-storm.
First thunder in winter or spring indicates rain and very cold weather. (Dr. John Menual.)
With the first thunder the gods of rain open their petals. (Zuñi.)
Forked Lightning.
Forked lightning at night,