Park outside with parking brake engaged and engine running.
Pressurize the interior by turning on A/C, blower set to high, doors and windows closed, and recirc turned off.
Mix up some of your favorite Jeep wash triple strength and get some on the place (outside) where you suspect the water might be entering. You will see right away where and what the problem really is. Keep sudsing it up in various places, especially the windshield frame and upper cowl areas.