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Atmospheric River Impacting California

January 28, 2021

This event has the potential to trigger a bloom of desert annuals in the southwestern United States, perhaps followed by an outbreak of Painted Ladies by early March.  This depends on whether enough of the heavy rainfall predicted for the coastal regions of southern California on Friday, January 29 crosses the San Jacinto Mountains to substantially water the deserts to the east.

From the U.S. National Weather Service on January 28:

Red Admirals Are Arriving in the Upper Midwest

April 10, 2023

Spring has arrived here in Iowa, and so have the butterflies, including Red Admirals.  After the last three years with low numbers, it’s now looking like 2023 is going to be a more active, abundant, and exciting year for Red Admirals.  I’m still not sure how the Painted Lady population will develop this year, owing to the unusually intense and variable weather in California this past winter.