Boi local controller reported clearing an aircraft for takeoff with another aircraft on short final....

Attributes
ACN	1379476
Time
Date	201608
Local Time Of Day	0601-1200
Place
Locale Reference	BOI.Tower
State Reference	ID
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Make Model Name	Small Aircraft High Wing 1 Eng Fixed Gear
Operating Under FAR Part	Part 91
Flight Phase	Final Approach
Route In Use	None
Flight Plan	VFR
Aircraft 2
Make Model Name	Small Aircraft High Wing 1 Eng Fixed Gear
Operating Under FAR Part	Part 91
Flight Phase	Taxi
Route In Use	None
Flight Plan	VFR
Person 1
Function	Local
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 4
Events
Anomaly	ATC Issue All Types Conflict Ground Conflict Critical Deviation - Procedural Clearance

Narrative:

Smoky day; visibility 3 miles. Aircraft X reported inbound 15 miles northeast of boise for runway 10R. I cleared aircraft X to land runway 10R. I was busy talking with fellow controllers and aircraft X was the only aircraft I was talking to. I didn't write down the call sign on my scratchpad. 8 minutes later aircraft Y called ready for departure runway 10R. I scanned the radar and my pad and the runway. I totally forgot about aircraft X and didn't see him short final due to the smoke around the airport. I cleared aircraft Y for takeoff. I heard 'cancel that' over frequency. I said 'say again' and aircraft X said he was short final landing runway 10R. I immediately canceled aircraft Y takeoff clearance. Fortunately he was still holding short of the runway and didn't move. No separation lost. Humbling experience. Scared me very bad today and ruined my day. I will be more proactive on writing down all arrivals on my scratchpad and make sure I don't cut corners. Thanks to aircraft X for being vigilant and seeing the whole picture. He was able to stop an issue that could've been very bad. It's a team concept also to include pilots. I had him call me on the phone after he landed and thanked him for calling me out on my mistake.

Original NASA ASRS Text

Title: BOI Local Controller reported clearing an aircraft for takeoff with another aircraft on short final. The aircraft on short final alerted the Controller to the mistake.

Narrative: Smoky day; visibility 3 miles. Aircraft X reported inbound 15 miles northeast of Boise for Runway 10R. I cleared Aircraft X to land Runway 10R. I was busy talking with fellow controllers and Aircraft X was the only aircraft I was talking to. I didn't write down the call sign on my scratchpad. 8 minutes later Aircraft Y called ready for departure Runway 10R. I scanned the radar and my pad and the runway. I totally forgot about Aircraft X and didn't see him short final due to the smoke around the airport. I cleared Aircraft Y for takeoff. I heard 'cancel that' over frequency. I said 'say again' and Aircraft X said he was short final landing Runway 10R. I immediately canceled Aircraft Y takeoff clearance. Fortunately he was still holding short of the runway and didn't move. No separation lost. Humbling experience. Scared me very bad today and ruined my day. I will be more proactive on writing down all arrivals on my scratchpad and make sure I don't cut corners. Thanks to Aircraft X for being vigilant and seeing the whole picture. He was able to stop an issue that could've been very bad. It's a team concept also to include pilots. I had him call me on the phone after he landed and thanked him for calling me out on my mistake.

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.

Boi local controller reported clearing an aircraft for takeoff with another aircraft on short final. The aircraft on short final alerted the controller to the mistake.