Narrative:

While waiting in line for departure; it became apparent it was the beginning of the early morning push for departures interspersed with a steady stream of arrivals. Runway 25R was in use for arrivals/departures along with operations being conducted from the runway 19L/right complex. I cannot adequately provide the color to the story except to say that there had been a go-around from the runway 19L/right complex and a hot air balloon that made multiple unanswered calls to the las tower. Earlier; [the] balloon had checked in with las tower to report operations six miles west of the airport at 4000 feet. The controller eventually did answer [the] balloon; advising [him] to remain clear of class B airspace. Balloon responded by saying they would be operating six miles west of the airport at 5000 feet. The controller did not acknowledge the transmission. A B737 had been cleared for takeoff on runway 25R. Holding short of 25R; las tower asked if we had that [B737] in sight. We replied that we had the [B737] in sight as the B737 was just beginning its takeoff roll. We were subsequently cleared to line up and wait on runway 25R. Taking the runway; we were cleared for takeoff by the tower. Aligning the airplane on the runway; I noticed two things. One; the B737 wasn't airborne yet; and secondly there was a flight of two hot air balloons operating west of the airport. I delayed our takeoff roll; since the B737 wasn't airborne. I asked the first officer to confirm we were cleared for takeoff. The first officer was initially unable to do so as the controller had cleared the airplane behind us to line up and wait. The controller confirmed we had been cleared for takeoff. We began our takeoff roll as the B737 became airborne. During our takeoff roll; the tower advised arriving 25R traffic to prepare for a go-around. Flying the COWBY6 RNAV departure; at 600 feet AGL; we encountered the B737's wake turbulence. The wake turbulence continued until the initial turn passing rbell to roppr intersection with the worst rolling moment of the wake turbulence occurring during that turn. The wake turbulence made flying the lateral portion of the COWBY6 RNAV departure difficult particularly turning toward roppr intersection since the turn had been begun late due to having to manage the wake turbulence. Keep in mind; the flight of two hot-air balloons operating west of the airport.

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Original NASA ASRS Text

Title: B737 Captain reported a track deviation resulted departing LAS after encountering wake turbulence in trail of another B737.

Narrative: While waiting in line for departure; it became apparent it was the beginning of the early morning push for departures interspersed with a steady stream of arrivals. Runway 25R was in use for arrivals/departures along with operations being conducted from the Runway 19L/R complex. I cannot adequately provide the color to the story except to say that there had been a go-around from the Runway 19L/R complex and a hot air balloon that made multiple unanswered calls to the LAS tower. Earlier; [the] balloon had checked in with LAS tower to report operations six miles west of the airport at 4000 feet. The controller eventually did answer [the] balloon; advising [him] to remain clear of Class B Airspace. Balloon responded by saying they would be operating six miles west of the airport at 5000 feet. The controller did not acknowledge the transmission. A B737 had been cleared for takeoff on Runway 25R. Holding short of 25R; LAS tower asked if we had that [B737] in sight. We replied that we had the [B737] in sight as the B737 was just beginning its takeoff roll. We were subsequently cleared to line up and wait on Runway 25R. Taking the runway; we were cleared for takeoff by the tower. Aligning the airplane on the runway; I noticed two things. One; the B737 wasn't airborne yet; and secondly there was a flight of two hot air balloons operating west of the airport. I delayed our takeoff roll; since the B737 wasn't airborne. I asked the First Officer to confirm we were cleared for takeoff. The First Officer was initially unable to do so as the controller had cleared the airplane behind us to line up and wait. The controller confirmed we had been cleared for takeoff. We began our takeoff roll as the B737 became airborne. During our takeoff roll; the tower advised arriving 25R traffic to prepare for a go-around. Flying the COWBY6 RNAV Departure; at 600 feet AGL; we encountered the B737's wake turbulence. The wake turbulence continued until the initial turn passing RBELL to ROPPR intersection with the worst rolling moment of the wake turbulence occurring during that turn. The wake turbulence made flying the lateral portion of the COWBY6 RNAV Departure difficult particularly turning toward ROPPR Intersection since the turn had been begun late due to having to manage the wake turbulence. Keep in mind; the flight of two hot-air balloons operating west of the airport.

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.