3. Weather

Destructive Weather:

Destructive Weather Operations ASO 3440.2R DWX

Severe Weather Flight line Warning System Airfield Hazard Notification System

warning lights


Thunderstorm watches and Warnings:

Thunderstorm Watch (T2): Destructive winds with Thunderstorms within 25 miles

Thunderstorm Watch (T1): Destructive winds with Thunderstorms within 10 miles

Lightning Warning (L10): Lightning with Thunderstorms within 10 miles: All Ordnance operations shall terminate when lightning is within 10 miles on MCAS Beaufort.

Lightning Warning (L5): Lightning with Thunderstorms within 5 miles: All outdoor airfield operations shall terminate when lightning is within 5 miles on MCAS Beaufort.


Flag Conditions:

white-flagWhite (No) Flag Condition. The WBGT index is < = 79.9°F. Continue to stay hydrated and be alert for changing weather conditions.

green flagGreen Flag Condition. The WBGT index is 80-84.9°F. Unrestricted physical activity may be carried out. Take at least 15 minutes of breaks each hour if working or exercising in direct sunlight. This is a guideline- please consult your SOP for your unit.

yellow flagYellow Flag Condition. The WBGT index is 85-87.9°F. Physical activity should be limited to those people who have been exercising in similar heat for a minimum of 10 days or more. Take at least 30 minutes of breaks each hour if working or exercising in direct sunlight .

red flagRed Flag Condition. The WBGT index is 88-89.9°F. Physical activity should be limited to those people who have been exercising in similar heat for a minimum of 10 days or more. Take at least 30 minutes of breaks each hour if working or exercising in direct sunlight .

black flagBlack Flag Condition. The WBGT index is 90°F or higher. Vigorous outdoor exercise, regardless of conditioning or heat acclimatization, is not advisable. Take at least 45 minutes of breaks each hour if working or exercising in direct sunlight.


Heat Casualty Prevention:

Heat Casualty Prevention ASO 6200.1J

OSHA Heat Stress link


Additional emergency Information/App’s:

**Download the AtHoc Emergency Notifier via your phone app store: To receive official notifications during severe weather or operational emergencies**

AtHoc Instructions: MCAS Beaufort AtHoc Notifier Instructions