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Weather and Migration

Dr. David Aborn

May 4 , 2005

Dear Students:

Busy, busy, busy! That is what it has been like for birders and ornithologists alike. Everything can be summed up in one word...fallouts! The front that moved through last week has kept the temperatures cool, but migration hot! Temps have only been in the 60's during the day, and near 40 at night around here. This is very unusual for early May. Those north winds have really been forcing birds to land across the country. April 30 and May 1 brought lots of birds to the Gulf coast. Texas, Louisiana, Mississippi, and Alabama all reported 14 species of warblers, 4 species of thrushes, Indigo Buntings, and Eastern Wood-Pewees. May 2 and 3 saw fallouts in the southeast and east. Here in Tennessee, dozens of warbler species are around. Birders at Shelby Park in Nashville saw 23 species of warblers (!!!) along with 5 species of vireos, Summer and Scarlet Tanagers, and Baltimore and Orchard Orioles. At my study site, many of the late season warblers were around my study site. These included Chestnut-sided Warblers, American Redstarts, Blackpoll Warblers, and Yellow-breasted Chats. Indigo Buntings were everywhere! I heard my first Eastern Wood-Pewee of the year, and I saw 2 Veerys (a species of thrush). Birders at Cravens House also saw 22 Rose-breasted Grosbeaks. The story elsewhere was the same, from Georgia to Massachusetts to Ohio: lots of warblers, thrushes, orioles, flycatchers, and buntings.

People out west were not disappointed. Once again, New Mexico had the greatest numbers and variety of migrants. New Mexico has a number of rivers and the riverside habitats are important for western migrants during their journey north from the tropics. Birders reported 9 species of warblers, as well as Greater Pewees, Cassin's Vireos, and Gray Flycatchers. California reported its first chats, redstarts, and Nashville Warblers. Migration even made its way up to the northern Rockies, with Montana reporting good numbers of Yellow Warblers, Orange-crowned Warblers, McGillivray's Warblers, and Cassin's Vireos.

The Outlook for Birdwatchers
Can we expect another big week coming up? Unfortunately not, at least not in the southern US. There are no fronts coming along to bring rain and north winds. The high pressure that is over much of the country will weaken, allowing southerly winds to predominate. This will allow many of the birds that were forced down this week to head north. People in the northern part of the country should continue to see birds arriving. Just because there won't be any fallouts doesn't mean there isn't plenty to see. Migrants will still be arriving from the tropics for about another week, so we're not done yet! Additionally, many of the migrants that have arrived are setting up territories. There is a lot of singing and activity going on, so even without fallouts we can enjoy the benefits of migration.

Take care.

David Aborn
North Chickamauga Creek Conservancy, TN

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The Next Weather and Songbird Migration Update will Be Posted the week of May 11, 2005.

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