Definition
A NOTAM contraction indicating that standing or pooled water is present on one or more runway surfaces at an airport. It alerts pilots to a runway condition that can reduce braking effectiveness, increase the risk of hydroplaning, and lengthen takeoff or landing distance.
Plain English
The runway has water sitting on it. Expect slippery conditions, longer stopping distances, and a higher chance of skidding.
Context Anchor
Seen in NOTAMs, which are official notices about airport, runway, or airspace conditions.
Why Pilots Care
Water on the runway can reduce braking effectiveness and create a risk of hydroplaning during takeoff or landing.
Grounding Statement
Standing water interferes with the tire's grip on the pavement.
Intuition Check
WTR does not mean rain is forecast or falling. It means water has been reported on the runway surface itself.
Example Sentence 1
The NOTAM listed WTR for Runway 27, so the pilot recalculated landing distance and added a margin for reduced braking.
Example Sentence 2
With WTR reported, the tower advised using a longer landing distance.