Low pressure tracked from the southern Plains to central Missouri and then to northern Indiana on February 27-28, 2011. Warmer moist air flowing ahead of the system developed rain across the region during the evening of February 27. However, colder air sweeping in from the west turned the rain over to a wintry mix of freezing rain, sleet and snow later in the evening and overnight. Temperatures fell from the 30s into the mid to upper 20s. Even a few thunderstorms developed in the transition during the evening. One thunderstorm near Tennessee, Illinois in McDonough county produced dime to nickel size hail. The bulk of the mixed precipitation fell across southeast Iowa, northwest and western Illinois and extreme northeast Missouri. Ice accumulations were less than 1/4 inch and were mainly on elevated surfaces such as trees.

Winter Weather in BUREAU, ILLINOIS
From 27-FEB-11 21:00:00 to 28-FEB-11 03:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in HANCOCK, ILLINOIS
From 27-FEB-11 18:00:00 to 27-FEB-11 23:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in HENDERSON, ILLINOIS
From 27-FEB-11 18:45:00 to 28-FEB-11 00:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in HENRY, ILLINOIS
From 27-FEB-11 19:30:00 to 28-FEB-11 00:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported 0.15 inch ice accumulation 1 mile west of Cambridge.

Winter Weather in MCDONOUGH, ILLINOIS
From 27-FEB-11 20:00:00 to 28-FEB-11 01:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in MERCER, ILLINOIS
From 27-FEB-11 19:00:00 to 28-FEB-11 00:15:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in PUTNAM, ILLINOIS
From 27-FEB-11 21:30:00 to 28-FEB-11 03:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in ROCK ISLAND, ILLINOIS
From 27-FEB-11 20:00:00 to 28-FEB-11 00:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in WARREN, ILLINOIS
From 27-FEB-11 19:30:00 to 28-FEB-11 01:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in CARROLL, ILLINOIS
From 27-FEB-11 21:00:00 to 28-FEB-11 02:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in STEPHENSON, ILLINOIS
From 27-FEB-11 21:30:00 to 28-FEB-11 03:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter at Freeport reported ice accumulations of 1/8 inch, with the freezing rain mixed with snow and sleet.

Winter Weather in WHITESIDE, ILLINOIS
From 27-FEB-11 20:45:00 to 28-FEB-11 01:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MCDONOUGH, ILLINOIS
From 27-FEB-11 19:45:00 to 27-FEB-11 19:45:00 (CST-6)
Location: TENNESSEE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter about 2 miles southwest of Tennessee measured dime to nickel size hail.