Narrative:

Was quite busy at ZZZ center. A lot of weather in and around sector. Seemed as though my airspace was the only route east and west of the weather. Many aircraft; not normally in sector; deviated into sector from other sectors/centers causing a greater than normal workload for myself and the sectors above and below me. Had been on position for well over an hour and not feeling well either. However; my illness did not factor into the error. I had passed a few break opportunities only because the workload did not permit me to give a solid briefing. In essence; I was too busy and my possible replacements did not appear to actually want to work the sector. As I stated; I do not believe any traffic in my sector at the time of the incident would actually be in my airspace on a normal day. Aircraft X on a weather reroute that took the aircraft into the weather the further west the aircraft progressed. I had the hand off on aircraft X when he checked onto my frequency level at FL300 with traffic at 12 o'clock and 10 miles eastbound at FL310. Aircraft X seemed all to anxious to start deviating to the southwest; but I could not do anything until I got him to FL340. I needed to do some coordination; traffic calls; and read some weather but I did a quick scan to climb aircraft X because he was begging for it. After scanning I climbed aircraft X to FL340; failing to see another aircraft eastbound at FL330 about 40 miles west. This may be due to data block overlap of just failing to see the traffic. I jumped on the line to coordinate a lander at FL330 because I could not get him any lower due to deviating traffic at FL320 and FL300. As I was talking I did a traffic scan and saw the conflict prior to the conflict alert going off. I immediately jumped off the line and turned aircraft X 25 right for traffic. I could not stop the aircraft because he was already out of FL322 at the time. I then turned aircraft Y 25 right as well; but I doubt he turned at all due to weather off his right. I did not have a j-ball in use because I did not have time. When I measured the traffic I had 4.7 miles. After the aircraft passed I went back and did coordination and other tasks and put both aircraft back on course.

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Original NASA ASRS Text

Title: Center Controller experienced a loss of separation event during a complex traffic period with multiple aircraft being routed through the airspace.

Narrative: Was quite busy at ZZZ Center. A lot of weather in and around sector. Seemed as though my airspace was the only route East and West of the weather. Many aircraft; not normally in sector; deviated into sector from other sectors/centers causing a greater than normal workload for myself and the sectors above and below me. Had been on position for well over an hour and not feeling well either. However; my illness did not factor into the error. I had passed a few break opportunities only because the workload did not permit me to give a solid briefing. In essence; I was too busy and my possible replacements did not appear to actually want to work the sector. As I stated; I do not believe any traffic in my sector at the time of the incident would actually be in my airspace on a normal day. Aircraft X on a weather reroute that took the aircraft into the weather the further West the aircraft progressed. I had the hand off on Aircraft X when he checked onto my frequency level at FL300 with traffic at 12 o'clock and 10 miles eastbound at FL310. Aircraft X seemed all to anxious to start deviating to the SW; but I could not do anything until I got him to FL340. I needed to do some coordination; traffic calls; and read some weather but I did a quick scan to climb Aircraft X because he was begging for it. After scanning I climbed Aircraft X to FL340; failing to see another aircraft Eastbound at FL330 about 40 miles West. This may be due to data block overlap of just failing to see the traffic. I jumped on the line to coordinate a lander at FL330 because I could not get him any lower due to deviating traffic at FL320 and FL300. As I was talking I did a traffic scan and saw the conflict prior to the Conflict Alert going off. I immediately jumped off the line and turned Aircraft X 25 right for traffic. I could not stop the aircraft because he was already out of FL322 at the time. I then turned Aircraft Y 25 right as well; but I doubt he turned at all due to weather off his right. I did not have a J-Ball in use because I did not have time. When I measured the traffic I had 4.7 miles. After the aircraft passed I went back and did coordination and other tasks and put both aircraft back on course.

Data retrieved from NASA's ASRS site as of April 2012 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.