The waterpump weep hole actually has the OPPOSITE symptoms: it leaks when the motor is off, never when it is on. It would "leak" through the weep hole, and it indicates that the bearing seal has been broken, and that the pump may seize soon. It would leave a stain all over the bottom of the engine (the grey reservoir in front of the oil pan)

I've had plenty a coolant leak! First the waterpump (through the weephole) at close to 100K, then the throttle-body heater hose (under the large dia. rad hose), now most recently is a broken clamp on the lower rad hose (replaced with the silicon rad hoses and new clamps!).

If you have a leak outside, I doubt that its the head gasket. Since its coming out when its hot, it should be pressure related. Check your upper and lower hoses with the engine running (get underneath the skid to check the lower hose - with blocks under the wheels). Next check the damn throttle body hose. Its a padded soft hose about 3/4" thick. After that, check your heater hoses. Is there an antifreeze smell inside? Is there any on the carpet. Is there any stain under the motor?