Narrative:

After takeoff from fll and while transitioning to the SID, deviations were requested from mia departure to avoid WX. First officer was PF and a climb had been previously issued from 3000 ft to 5000 ft. Shortly after receiving the avoidance vector, I noticed the aircraft climbing through 5250 ft. The first officer was made aware of the situation and corrected back to altitude after reaching 5400 ft. Departure control said nothing of the deviation and no aircraft were noted on TCASII. This is probably the worst case scenario for deviations, hand flying, low altitude between twring cumulo nimbus. I was busy on the radio and probably missed the 1000 ft to go callout. Had we been on autoplt, the situation would not have occurred. This, however, is rarely done -- low altitude, on departure and maneuvering around WX in commercial aircraft.

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Original NASA ASRS Text

Title: ALT OVERSHOOT DURING A WX AVOIDANCE DEP FROM FLL, FL.

Narrative: AFTER TKOF FROM FLL AND WHILE TRANSITIONING TO THE SID, DEVS WERE REQUESTED FROM MIA DEP TO AVOID WX. FO WAS PF AND A CLB HAD BEEN PREVIOUSLY ISSUED FROM 3000 FT TO 5000 FT. SHORTLY AFTER RECEIVING THE AVOIDANCE VECTOR, I NOTICED THE ACFT CLBING THROUGH 5250 FT. THE FO WAS MADE AWARE OF THE SIT AND CORRECTED BACK TO ALT AFTER REACHING 5400 FT. DEP CTL SAID NOTHING OF THE DEV AND NO ACFT WERE NOTED ON TCASII. THIS IS PROBABLY THE WORST CASE SCENARIO FOR DEVS, HAND FLYING, LOW ALT BTWN TWRING CUMULO NIMBUS. I WAS BUSY ON THE RADIO AND PROBABLY MISSED THE 1000 FT TO GO CALLOUT. HAD WE BEEN ON AUTOPLT, THE SIT WOULD NOT HAVE OCCURRED. THIS, HOWEVER, IS RARELY DONE -- LOW ALT, ON DEP AND MANEUVERING AROUND WX IN COMMERCIAL ACFT.

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.