Narrative:

During cruise; we received a call from one of the flight attendants informing us that the window at seat 18F appeared to be cracked. She said that there was ice forming on the pane of the window and that part of it seemed to be moving in the wind. The captain and I discussed the situation; verified that the aircraft was pressurizing properly; and checked the QRH to determine whether it contained a procedure that would specifically address the condition. The captain used ACARS to contact dispatch to bring the noc (network operations center) into the loop and very shortly thereafter one of our fas came up to the cockpit with a photo and a short video of the window. Dispatch consulted with maintenance control and asked us to advise them if we decided to divert.the captain and I discussed the overall situation and determined that the most prudent course of action would be to make a precautionary landing as soon as practical. [An alternate] was just over 100 miles ahead of us. The weather was suitable and its distance was ideal for us to make an appropriate descent as well as manage the workload involved in changing destinations and planning an overweight landing. We used the diversion information on the checklist to verify that all of the communication and aircraft specific tasks were conducted properly and the arrival; approach; and landing were uneventful. The entire team [was] tremendously helpful in ensuring our crew and passengers were ok and in facilitating an aircraft change and subsequent departure.

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Original NASA ASRS Text

Title: B737-700 First Officer reported diverting to an alternate airport after a Flight Attendant reported a cabin window looked like it was cracked.

Narrative: During cruise; we received a call from one of the Flight Attendants informing us that the window at seat 18F appeared to be cracked. She said that there was ice forming on the pane of the window and that part of it seemed to be moving in the wind. The Captain and I discussed the situation; verified that the aircraft was pressurizing properly; and checked the QRH to determine whether it contained a procedure that would specifically address the condition. The Captain used ACARS to contact Dispatch to bring the NOC (Network Operations Center) into the loop and very shortly thereafter one of our FAs came up to the cockpit with a photo and a short video of the window. Dispatch consulted with Maintenance Control and asked us to advise them if we decided to divert.The Captain and I discussed the overall situation and determined that the most prudent course of action would be to make a precautionary landing as soon as practical. [An alternate] was just over 100 miles ahead of us. The weather was suitable and its distance was ideal for us to make an appropriate descent as well as manage the workload involved in changing destinations and planning an overweight landing. We used the diversion information on the checklist to verify that all of the communication and aircraft specific tasks were conducted properly and the arrival; approach; and landing were uneventful. The entire team [was] tremendously helpful in ensuring our crew and passengers were OK and in facilitating an aircraft change and subsequent departure.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.