b. Procedures for Measuring/Monitoring Weather Conditions 

The WBGT Index or Apparent Temperature should be measured by the PHCP a minimum of three (3) times, and a maximum of five (5) times, per day. The readings will be determined by the PHCP and the Supervisor prior to the start of play and will be posted in the Supervisor’s office. Measurements should be taken every two (2) hours, but at a minimum, three (3) readings should be taken at the following times: 

i. One-half hour before match play begins; 

ii. Middle of the scheduled day; and 

iii. Just prior to beginning of the last match of the day, or prior to the start of the first evening match. 

The WBGT Index or Apparent Temperature also should be measured under the following circumstances: 

iv. Following any suspension of play; and 

v. At the discretion of the Supervisor, in consultation with the Tournament Physician and/or PHCP. 

c. Modification of Play Timing and Weather Condition Change 

When the Extreme Weather Condition Modification of Play is in effect before the start of a match, the procedures set out below in sub-Section d, shall be followed. 

In the event that during the day there is a change in weather conditions as determined by this periodic monitoring, the Extreme Weather Condition Rule can be put into effect at any time on all courts, including matches already in progress. Once notified that the Extreme Weather Condition Rule is in effect, the Chair Umpire must inform the players at the next opportunity, no later than the next change of ends. 

If there is a sudden change in weather conditions and the Rule is lifted, those matches already in progress will continue under the Extreme Weather Condition Rule. In the case of rain or interruption to play, the Supervisor and PHCP can re-assess the Extreme Weather Condition Rule. 

d. Modification of Play Procedures, Singles 

A 10-minute break will be allowed between the second and third sets 

