Now’s the time to be looking for migrating Common Nighthawks. The best time to see flocks is late afternoon and evening. They feed as they fly and are often seen over water. In my experience, they often turn up after a rain event.
Here are some recent sightings from Tim Dyson who lives in the Warsaw area:
1.On the evening of August 16, I saw 41 Common Nighthawks over the Indian River just north of Warsaw. I watched for 30 minutes, just after the sun had set. They were moving along southward in groups averaging about five per group.
2. August 18th between 6:24pm and 6:27 pm, no less than 98 Common Nighthawks passed overhead where I am just n/w of Warsaw. Through a curtain of moderate rainfall, they were heading roughly s/w at average nighthawk height (100+ meters from the ground). Not really darting here and there much as is typical of them, but seemingly more intent on the direction they headed and the altitude they were keeping. Appearing as three loosely-connected bunches, it was difficult to count them at times, therefore I am glad they weren’t in whirling masses as is sometimes the case. They stretched to the eastern and western horizon, and despite my frantic searching, I could not bring the total to an even hundred birds or more. Although I have lived in a fair number of locations in the county over the past 25 years from Belmont Lake, Rice Lake, Buckhorn, and Nephton and places in between, interestingly, the Warsaw area has always yielded the highest numbers for migrating nighthawks in my experience, both now, and in the early-to-mid 1990s).
3. August 19th I got home to Warsaw just before dark in time to notice only 2 nighthawks flying past from east to west. I waited around another ten minutes or so, but saw no more.
4. On the morning of August 20th, (the date I’ve always considered to be average for observing large numbers of the species), 14 nighthawks just appeared to the north, gathered, (and very much like migrating Broad-winged Hawks will about four weeks from now), they “kettled” in a thermal and rode it straight up and out of my sight. This happened at 10:30am, it is sunny, humid, and 24 degrees outside. I find this far more bizarre than seeing more than one hundred nighthawks during an evening observation. That’s pretty normal. But a small kettle of them before noon… that’s just plain odd for me!