Narrative:

Executing an ILS approach to runway 27 at iah with ATIS reporting 700' broken and 7 mi visibility. On short final, a thunderstorm crossed the approach end of the runway, totally obscuring the landing area and necessitating a missed approach at minimums. Immediately after notifying tower of the missed approach we were instructed to make a hard left turn and climb for traffic avoidance. Several xmissions were blocked making communications difficult. The large transport was at 150000 pounds, making maneuvering difficult and compliance with a hard turn and climb impossible. We were at flaps 25 degrees, gear up, attempting to accelerate. The maximum rate of turn possible was executed. The entire maneuver was executed in IMC conditions with heavy rain and possible wind shear. (The aircraft accelerated very slowly to flaps 15 degrees maneuvering speed.) it was determined later by talking to the tower supervisor on the phone that the conflict was caused by an small transport taking off on runway 14 that interfered with executing the published missed approach. The small transport was cleared for takeoff when the visibility was still above 2 mi, but the thunderstorm reduced visibility so suddenly that our unexpected missed approach resulted in an unforeseen conflict.

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Original NASA ASRS Text

Title: LGT MADE MISSED APCH AND WAS ISSUED ALTERNATE INSTRUCTIONS DUE TO AN IFR DEP JUST AIRBORNE.

Narrative: EXECUTING AN ILS APCH TO RWY 27 AT IAH WITH ATIS RPTING 700' BROKEN AND 7 MI VISIBILITY. ON SHORT FINAL, A TSTM CROSSED THE APCH END OF THE RWY, TOTALLY OBSCURING THE LNDG AREA AND NECESSITATING A MISSED APCH AT MINIMUMS. IMMEDIATELY AFTER NOTIFYING TWR OF THE MISSED APCH WE WERE INSTRUCTED TO MAKE A HARD LEFT TURN AND CLB FOR TFC AVOIDANCE. SEVERAL XMISSIONS WERE BLOCKED MAKING COMS DIFFICULT. THE LGT WAS AT 150000 LBS, MAKING MANEUVERING DIFFICULT AND COMPLIANCE WITH A HARD TURN AND CLB IMPOSSIBLE. WE WERE AT FLAPS 25 DEGS, GEAR UP, ATTEMPTING TO ACCELERATE. THE MAX RATE OF TURN POSSIBLE WAS EXECUTED. THE ENTIRE MANEUVER WAS EXECUTED IN IMC CONDITIONS WITH HEAVY RAIN AND POSSIBLE WIND SHEAR. (THE ACFT ACCELERATED VERY SLOWLY TO FLAPS 15 DEGS MANEUVERING SPD.) IT WAS DETERMINED LATER BY TALKING TO THE TWR SUPVR ON THE PHONE THAT THE CONFLICT WAS CAUSED BY AN SMT TAKING OFF ON RWY 14 THAT INTERFERED WITH EXECUTING THE PUBLISHED MISSED APCH. THE SMT WAS CLRED FOR TKOF WHEN THE VISIBILITY WAS STILL ABOVE 2 MI, BUT THE TSTM REDUCED VISIBILITY SO SUDDENLY THAT OUR UNEXPECTED MISSED APCH RESULTED IN AN UNFORESEEN CONFLICT.

Data retrieved from NASA's ASRS site as of August 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.