St. Mary’s County Public High Schools are equipped with Lightning Detection Equipment at each of our three high schools. The lightning detection equipment includes an alert siren and visual strobe. When lightning is detected within 10 miles of each high school campus the alert siren and visual strobe will activate. After 30 minutes has elapsed with no more lightning detected within 10 miles, the alert siren will activate again indicating all clear. At this point, depending on field conditions, the contest/activity may resume. Please see the visual below for specific details.

Lightning Safety Brochure, explained in previous text.

School-specific countdown clocks are linked below and can be accessed or downloaded on your mobile device.

You may visit the St. Mary’s County Emergency Operations Center’s (EOC) Siren Sounds and Messages page for examples that you may hear during a test or emergency.

High School Countdown Clocks

CHS

GMHS

LHS