Narrative:

Runway 27L IFR WX with snow. Tower clears a crj for takeoff. Tells me to take position -- to be ready. Bombardier lifts off, and I am cleared for takeoff, 250 degree heading. Into the clouds, TCASII give a TA. I am gaining on the crj in distance and altitude. When crj is a mi to 1-1/1 mi ahead and 200 ft above, I turn off autoplt and turn 15-20 degrees right, I level off. I turn autothrottles off and pull power off. Departure gives crj a 140 degree heading and gives me a climb to 13000 ft. Crj turns and I re-establish climb. Neither tower nor departure gives any indication of our close proximity. I would guess that the crj was expecting a turn southeast and was probably only doing maybe 200 KTS. To minimize the distance, he would go west. Tower seemed inclined to get as many departures out as possible. Tower had a snowplow line coming down runway 14R to hold short runway 27L, but tower told snowplow line to expect clearance to cross runway 27L as they approached runway 27L. I did not tell departure or center that I wanted to report or file a near miss.

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Original NASA ASRS Text

Title: MD80 CREW DEPART ORD RWY 27L AND TAKE EVASIVE ACTION WHEN THEY COME WITHIN ONE AND ONE HALF MI AND 200 FT VERT FROM A PRECEDING CRJ.

Narrative: RWY 27L IFR WX WITH SNOW. TWR CLRS A CRJ FOR TKOF. TELLS ME TO TAKE POS -- TO BE READY. BOMBARDIER LIFTS OFF, AND I AM CLRED FOR TKOF, 250 DEG HDG. INTO THE CLOUDS, TCASII GIVE A TA. I AM GAINING ON THE CRJ IN DISTANCE AND ALT. WHEN CRJ IS A MI TO 1-1/1 MI AHEAD AND 200 FT ABOVE, I TURN OFF AUTOPLT AND TURN 15-20 DEGS R, I LEVEL OFF. I TURN AUTOTHROTTLES OFF AND PULL PWR OFF. DEP GIVES CRJ A 140 DEG HDG AND GIVES ME A CLB TO 13000 FT. CRJ TURNS AND I RE-ESTABLISH CLB. NEITHER TWR NOR DEP GIVES ANY INDICATION OF OUR CLOSE PROX. I WOULD GUESS THAT THE CRJ WAS EXPECTING A TURN SE AND WAS PROBABLY ONLY DOING MAYBE 200 KTS. TO MINIMIZE THE DISTANCE, HE WOULD GO W. TWR SEEMED INCLINED TO GET AS MANY DEPS OUT AS POSSIBLE. TWR HAD A SNOWPLOW LINE COMING DOWN RWY 14R TO HOLD SHORT RWY 27L, BUT TWR TOLD SNOWPLOW LINE TO EXPECT CLRNC TO CROSS RWY 27L AS THEY APCHED RWY 27L. I DID NOT TELL DEP OR CTR THAT I WANTED TO RPT OR FILE A NEAR MISS.

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.