Narrative:

Requested turn to right 10-15 degrees to avoid thunderstorm cell. While on vector, ZME asked if we could climb to FL410. We said we could, so we commenced slow climb while modifying heading 10-15 degrees to avoid unforeseen anvil head. Received TA, followed quickly by RA. Autoplt disconnected and climb to green arc on TCASII initiated. Air carrier Y as well as we reported RA. I think ATC forgot we were so close to air carrier Y or expected a greater than 500 FPM rate of climb and didn't tell us. Supplemental information from acn 519404: we were in cruise flight FL370 en route from las-atl. Approaching rzc VORTAC, asked for and received clearance to deviate right (south) of course to avoid WX (thunderstorm buildups). During the climb, an overhang from nearby thunderstorm required a further right turn of 20-30 degrees for a lateral distance of about 1 NM prior to continuing on course to mem VORTAC. During this turn, and as briefly popped out of overhang, received traffic RA, disconnected autoplt, and climbed as RA directed about 1000 ft. Briefly gained sight of traffic as it proceeded southwest after event. No traffic calls of any kind were received from center. Believe the lack of performance of aircraft during high altitude climb coupled with WX deviations caused the timing of this traffic passage to not occur as ATC had planned. A time limit for the climb from FL370 to FL410 and/or notification of possible conflicting traffic would have alleviated the situation.

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Original NASA ASRS Text

Title: ZME REQUESTED B757 CREW TO CLB FROM FL370 TO FL410. DURING CLB, CREW RECEIVED TCASII RA AND TOOK EVASIVE ACTION TO AVOID AN ACR ACFT.

Narrative: REQUESTED TURN TO R 10-15 DEGS TO AVOID TSTM CELL. WHILE ON VECTOR, ZME ASKED IF WE COULD CLB TO FL410. WE SAID WE COULD, SO WE COMMENCED SLOW CLB WHILE MODIFYING HDG 10-15 DEGS TO AVOID UNFORESEEN ANVIL HEAD. RECEIVED TA, FOLLOWED QUICKLY BY RA. AUTOPLT DISCONNECTED AND CLB TO GREEN ARC ON TCASII INITIATED. ACR Y AS WELL AS WE RPTED RA. I THINK ATC FORGOT WE WERE SO CLOSE TO ACR Y OR EXPECTED A GREATER THAN 500 FPM RATE OF CLB AND DIDN'T TELL US. SUPPLEMENTAL INFO FROM ACN 519404: WE WERE IN CRUISE FLT FL370 ENRTE FROM LAS-ATL. APCHING RZC VORTAC, ASKED FOR AND RECEIVED CLRNC TO DEVIATE R (S) OF COURSE TO AVOID WX (TSTM BUILDUPS). DURING THE CLB, AN OVERHANG FROM NEARBY TSTM REQUIRED A FURTHER R TURN OF 20-30 DEGS FOR A LATERAL DISTANCE OF ABOUT 1 NM PRIOR TO CONTINUING ON COURSE TO MEM VORTAC. DURING THIS TURN, AND AS BRIEFLY POPPED OUT OF OVERHANG, RECEIVED TFC RA, DISCONNECTED AUTOPLT, AND CLBED AS RA DIRECTED ABOUT 1000 FT. BRIEFLY GAINED SIGHT OF TFC AS IT PROCEEDED SW AFTER EVENT. NO TFC CALLS OF ANY KIND WERE RECEIVED FROM CTR. BELIEVE THE LACK OF PERFORMANCE OF ACFT DURING HIGH ALT CLB COUPLED WITH WX DEVS CAUSED THE TIMING OF THIS TFC PASSAGE TO NOT OCCUR AS ATC HAD PLANNED. A TIME LIMIT FOR THE CLB FROM FL370 TO FL410 AND/OR NOTIFICATION OF POSSIBLE CONFLICTING TFC WOULD HAVE ALLEVIATED THE SIT.

Data retrieved from NASA's ASRS site as of July 2007 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.