Tuesday, September 8, 2015

Sept 9, 2015: Heavy Migration - Northern Illinois (+ Sept 10 Report)

Hello birding friends,

This is a combined migration report for tonight and tomorrow (Wednesday) night because I will not be reporting then.

Looking at the current national composite radar, the NORTHERN 1/3 of Illinois is experiencing MODERATE to HEAVY MIGRATION tonight spurred on by little precipitation and favorable northerly tailwinds. This is evidenced by the expansive green areas of radar noise in northern Illinois and southern Wisconsin, indicating 300 - 3000 birds per cubic kilometer.

The central 1/3 of Illinois should be experiencing light to moderate migration, depending on how far north the storms reach in Illinois tonight (storms inhibit bird migration).

The southern 1/3 of the state should only see negligible to light amounts of migration tonight because of the storms that will be in the area tonight and into tomorrow.


Northerly winds in the northern 1/2 of the state and variable winds in the southern 1/2 of the state should mean moderate to heavy concentrations of migrants for all of Illinois Wednesday night. All areas of the state, especially the northern half, should be worth birding Thursday morning.

Liz Day Shorebird Forecast: Desirable late shorebird-migration species that should start appearing/have already started to appear in mudflat areas should be Red Knot and Stilt Sandpiper. Also, start looking for migrating Wilson's Snipe in more overgrown wetland areas, although it wouldn't be an anomaly to find one on a mudflat, as well.

To predict exactly which species you are likely to find and when, please reference:
Birdcast's regional migration forecast for this week
eBird's Illinois species occurrence map

In summary, NORTHERN Illinois birders should GO BIRDING TOMORROW and ALL Illinois birders should go on THURSDAY morning!

Henry (Oak Park, Cook County)

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