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Red Admirals Arriving in the Upper Midwest

I've received an e-mail from a friend who was wondering when Red Admirals would be arriving in the upper Midwest this spring. He had not seen any postings of that species on the Wisconsin Butterflies recent sightings page, or on iNaturalist, and asked me how unusual it is to not see Red Admirals this far into the season.

The first Red Admirals in central Iowa have been later than average this year (the average arrival time here is in mid-April, but the first one can arrive as early as late March to as late as mid-May). There have been several possible reasons for this:

1) It has been a generally cold spring until now.
2) Whenever there were warmer temperatures above 60 F with southerly winds, the air was very dry. They prefer not only warmth and winds from the south, but also sufficient humidity, with dew points above 55 F.
3) The jet stream for the last few weeks was passing from central Texas through Mississippi, Alabama, and Georgia and then ...more ↓

Posted on April 27, 2021 20:45 by iowabiologist iowabiologist | 0 comments | Leave a comment
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The Vanessa Migration Project is an opportunity for you to share your observations of Vanessa butterflies to find out how they migrate and distribute themselves across North America each year. We are tracking the movements and seasonal changes in their ...more ↓

iowabiologist created this project on March 29, 2016
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