Baltimore local controller reported approving an aircraft to cross a runway after the departing airc...

Narrative:

I was working the local control position during a west operation. Traffic was very light with only a few departures for runway 28 and a couple of arrivals for runway 33L. Ground control asked to cross runway 28 at R1 with aircraft Y behind my aircraft that was on departure roll. I approved ground control's request to cross. After my scan to make sure I had the required spacing for my next departure; I issued aircraft X a departure clearance off of runway 28. Right after the aircraft X flight began takeoff roll; ground control alerted me of aircraft Y flight crossing down the field. I immediately canceled aircraft X takeoff clearance; and advised the aircraft to stop the roll due to traffic crossing midfield. Aircraft X stopped short of taxiway delta on runway 28. The aircraft was then taxied clear of the runway and into a hold area to reconfigure. I did not use a memory aid for the crossing which would have aided in preventing this incident.my recommendation for myself would be to utilize the memory aids regardless of the traffic complexity. This is not a facility issue. Management recently stressed the importance of memory aids in our local read and initial binder.

Original NASA ASRS Text

Title: Baltimore Local Controller reported approving an aircraft to cross a runway after the departing aircraft. Local then cleared an additional aircraft for takeoff before the aircraft had finished crossing downfield.

Narrative: I was working the Local Control position during a west operation. Traffic was very light with only a few departures for Runway 28 and a couple of arrivals for Runway 33L. Ground Control asked to cross Runway 28 at R1 with Aircraft Y behind my aircraft that was on departure roll. I approved Ground Control's request to cross. After my scan to make sure I had the required spacing for my next departure; I issued Aircraft X a departure clearance off of Runway 28. Right after the Aircraft X flight began takeoff roll; Ground Control alerted me of Aircraft Y flight crossing down the field. I immediately canceled Aircraft X takeoff clearance; and advised the aircraft to stop the roll due to traffic crossing midfield. Aircraft X stopped short of Taxiway Delta on Runway 28. The aircraft was then taxied clear of the runway and into a hold area to reconfigure. I did not use a memory aid for the crossing which would have aided in preventing this incident.My recommendation for myself would be to utilize the memory aids regardless of the traffic complexity. This is not a facility issue. Management recently stressed the importance of memory aids in our local read and initial binder.

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.

Attributes
ACN	1483003
Time
Date	201709
Local Time Of Day	0001-0600
Place
Locale Reference	BWI.Airport
State Reference	MD
Aircraft 1
Make Model Name	Medium Transport
Operating Under FAR Part	Part 121
Flight Phase	Takeoff
Route In Use	None
Flight Plan	IFR
Aircraft 2
Make Model Name	Widebody Transport
Flight Phase	Taxi
Route In Use	None
Flight Plan	IFR
Person 1
Function	Local
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 9
Events
Anomaly	ATC Issue All Types Conflict Ground Conflict Critical Deviation - Procedural Clearance

Baltimore local controller reported approving an aircraft to cross a runway after the departing aircraft. Local then cleared an additional aircraft for takeoff before the aircraft had finished crossing downfield.