In a METAR message, what notation is used if wind shear is reported for all runways?

In a METAR message, the notation used to indicate that wind shear has been reported for all runways is "WS ALL RWY." This notation clearly communicates to pilots and ground personnel that wind shear is a concern across the entire airport, affecting all runway operations. The use of "ALL RWY" specifies that the wind shear phenomenon is not isolated to a single runway, which is critical for ensuring safety and making informed decisions regarding takeoff and landing procedures.

The clarity of this notation helps to alert pilots who may be preparing for flight operations in varying weather conditions, allowing them to make necessary adjustments in their approach and landing strategies. Properly conveying the extent of wind shear conditions is essential for situational awareness in aviation, and "WS ALL RWY" effectively serves that purpose by encompassing the full operational area of the airport.