Boom Chachalaca: 2013 Hawk Weekend at Hawk Ridge Bird Observatory

Thursday, September 19, 2013

2013 Hawk Weekend at Hawk Ridge Bird Observatory

By Cory Ritter

HRBO's annual Hawk Weekend Festival runs during the third full weekend in September, so it starts tomorrow (Friday, September 20th) and runs through Sunday. Since September started on a Sunday this year, the September 20th start date is the latest since 2002. I've been worried that the festival may be a little too late to catch the Broad-wing migration, so I looked into the hawkcount.org data for the past ten years to see what we can expect for this weekend.

Over the last ten years (1993-2012), seven of the biggest days came on September 14th (4) and September 15th (3). Another came on September 16th, making the middle of the month the most likely to see the big day. The final two big days were outliers, one on September 20, 2006 and one on September 9, 2012.

During this time, there have been 53 days with over one thousand Broad-winged Hawks counted from the Ridge—averaging 5.3 days with over one thousand Broad-wings per season. Of those 53 days, 16 (30.2%) were on or after September 20th.

With that being said, September 20th is a bit late in the season for the Broad-winged Hawk peak, but they have peaked this late in the past. Also, we have only had two 1,000+ Broad-wing days this season—against an average of 5.3. Furthermore, we have had a week of unfavorable winds from the south or east and a couple days of fog and rain. This weather is supposed to clear out for the weekend, and leave us with favorable west or northwest winds—just in time for Hawk Weekend.

With the good weather headed our way and a history of some big Broad-wing days around this time of the season, this weekend looks like it is shaping up to be a good one! Here are some birds that are coming through right now, and you can expect to see them at the Ridge this weekend.