B737 first officer reported the captain's L2 cockpit window cracked after arcing.

Attributes
ACN	1521121
Time
Date	201802
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	Mixed
Light	Night
Aircraft 1
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Component
Aircraft Component	Cockpit Window
Person 1
Function	First Officer Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 264
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

Climbing out enroute the captains L2 window arced. There was no associated light but we turned off the respective power switch anyway. A few seconds later the window shattered. It appeared to only be the outer pane so we ran the appropriate QRH. After further inspection we discovered a small portion near the lower; forward section of the window had a crack on the inner pane. We returned to the QRH to complete the necessary steps and decided to divert to the nearest suitable airport. We landed uneventfully and deplaned the passengers at the gate.

Original NASA ASRS Text

Title: B737 First Officer reported the Captain's L2 cockpit window cracked after arcing.

Narrative: Climbing out enroute the Captains L2 window arced. There was no associated light but we turned off the respective power switch anyway. A few seconds later the window shattered. It appeared to only be the outer pane so we ran the appropriate QRH. After further inspection we discovered a small portion near the lower; forward section of the window had a crack on the inner pane. We returned to the QRH to complete the necessary steps and decided to divert to the nearest suitable airport. We landed uneventfully and deplaned the Passengers at the gate.

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.