Narrative:

North approach was the low side but had tail winds on base and base to final. All of their aircraft were coming in fast and having a hard time getting down. South approach was the high side and I left my aircraft up at 6000 feet for the turn to final to stay above north's aircraft. I heard the low side descend an aircraft to 4000 to get below mine but he was fast. I didn't hear them slow the aircraft so when I observed him descending out of 4800 feet and I was on a vector towards my final (the other aircraft was nearly established on final) I felt it was safe to descend out of 6000 and turn towards the final. My aircraft had a head wind on base so he was showing 190 knots across the ground and was completely under control as I turned him towards the final but he had descended faster than their aircraft which was showing 270 knots across the ground and descending slower. My recommendation would be to have switched the high and low sides because it was much easier to get down to the proper altitude on my side.

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Original NASA ASRS Text

Title: Strong crosswinds on base leg for simultaneous approaches to parallel runways at MSP complicates traffic control for ATC.

Narrative: North approach was the low side but had tail winds on base and base to final. All of their aircraft were coming in fast and having a hard time getting down. South approach was the high side and I left my aircraft up at 6000 feet for the turn to final to stay above North's aircraft. I heard the low side descend an aircraft to 4000 to get below mine but he was fast. I didn't hear them slow the aircraft so when I observed him descending out of 4800 feet and I was on a vector towards my final (the other aircraft was nearly established on final) I felt it was safe to descend out of 6000 and turn towards the final. My aircraft had a head wind on base so he was showing 190 knots across the ground and was completely under control as I turned him towards the final but he had descended faster than their aircraft which was showing 270 knots across the ground and descending slower. My recommendation would be to have switched the high and low sides because it was much easier to get down to the proper altitude on my side.

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.