CAD/USD buying-selling strategy for today

The following is my analysis for today's USD/CAD. I am not expert, just for fun. Welcome critics from everybody.
USD/CAD plunged to a one-month low of 1.3766 in midday New York trade, falling below the July 28th bottom of 1.3773. Support begins at 1.3780-60, backed by 1.3720 and 1.3670. On the upside, a rise above 1.3900 allows for a rebound to 1.4000.
Suggestion: buy at 1.3860-1.3840; stop-loss 1.39