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PUBLIC FACILITIES, RECREATION &
SPECIAL EVENTS DEPARTMENT
POLICY NUMBER 7.1
LIGHTNING GUIDELINES AT POOLS
4/5/2006
1/1/2014; 11/17/2020
Section 7 - Aquatics
I. PURPOSE
To ensure the safety of staff and patrons during electrical storms. Any time a facility is closed early
due to lightning or emergency situations, the aquatics management should be notified immediately.
II. PROCEDURE
If lightning is visible, its distance from your location can be estimated by counting the number of
seconds between when you see lightning and when you hear thunder (divide by 5 to get the
estimated distance). The National Weather Service and National Lightning Institute recommend
using the 30-30 rule to determine outside lightning safety. If thunder can be heard within 30
seconds of seeing a lightning flash, the pool shall be cleared. The pool shall remain cleared until
30 minutes after the last flash of lightning is seen (water condition may determine keeping it cl osed
longer). The following table explains a reasonable procedure to follow on the days that may be
threatened by thunderstorms.
Distance From Facility Action
More than 20 miles, or
storms are forecasted for
later in the day
Please advise customers as they enter the pool that the pool
may be cleared if lightning comes within 6 miles of the facility.
The city will not issue refunds to pool activities canceled due to
weather
6-20 miles away
Alert the customers every 15 minutes via the public address
system. Inform them of the 30-30-clearance rule and give them
an update on the storms estimated distance from the pool.
Less than 6 miles away
(30-30 rule)
Clear the pool and have staff and the public enter the bathhouse
until a time where it is safe to allow them to exit the facility and
go home, or the storm has passed. Keep customers and staff
away from windows. Minimize the use of telephones as they
could cause injury during an electrical storm. Allow participants
to make transportation arrangements on the phone when it
becomes safe.