Heat Stress

NAF El-Centro Menu

Heat Stress

From mid-May through September, NAF El Centro operates at Black Flag approximately 16 hours a day.

Heat related illness includes: heat rash, cramps, exhaustion and stroke. These illnesses are a real danger to people not accustomed to the stress of hot weather exercise. The Wet-Bulb Globe Temperature Index (WBGT) takes into account four variables: air temperature, humidity, radiant heat and air movement. Please advise personnel on the location of the flag poles are located in front of the Station Gym and Ops Security Gate

Heat Index and Physical Exercise Chart

WBGT Index (F)	Flag Color	Intensity of Physical Exercise NAVMED P-5010 CH
Less than 80	White	Extremely intense physical exertion may precipitate heat exhaustion or heat stroke, therefore, caution should be taken.
80-84	Green	Discretion required in planning heavy exercise for unseasoned personnel. This is a marginal heat stress limit for all personnel.
85-87	Yellow	Strenuous exercise and activity (e.g., close order drill) should be curtailed for new and unseasoned personnel during the first 3 weeks of heat exposure.
88-89	Red	Strenuous exercise curtailed for all personnel with less than 12 weeks training in hot weather.
90 and Above	Black	Physical training and strenuous exercise suspended for all personnel (excludes operational commitment not for training purposes).

Work/rest regimes of permissible Heat Exposure Threshold Limit Values, as recommended by the American Conference of Governmental Industrial Hygienist handbook, "Threshold Limit Values and Biological Exposure Indices", are illustrated below for a normal 8-hour workday. Percentages are for each work hour. Temperatures are listed as WBGT values in Fahrenheit, not to be confused with actual air temperatures in Fahrenheit.

Work Rest Regime	Light	Moderate	Heavy	Flag
Continuous Work	86F	80.1 F	77 F
75% Work/25% Rest	87.1F	82.4 F	78.6 F	Yellow
50% Work/50% Rest	88.5F	84.9 F	82.2 F	Red
25% Work/75% Rest	90 F	88 F	86 F	Black

For additional information call (760) 339-2488

Google Translation Disclaimer

Google Translate, a third party service provided by Google, performs all translations directly and dynamically.
Commander, Navy Region Southwest, cnrsw.cnic.navy.mil has no control over the features, functions, or performance of the Google Translate service.
The automated translations should not be considered exact and should be used only as an approximation of the original English language content.
This service is meant solely for the assistance of limited English-speaking users of the website.
Commander, Navy Region Southwest, cnrsw.cnic.navy.mil does not warrant the accuracy, reliability, or timeliness of any information translated.
Some items cannot be translated, including but not limited to image buttons, drop down menus, graphics, photos, or portable document formats (pdfs).
Commander, Navy Region Southwest, cnrsw.cnic.navy.mil does not directly endorse Google Translate or imply that it is the only language translation solution available to users.
All site visitors may choose to use similar tools for their translation needs. Any individuals or parties that use Commander, Navy Region Southwest, cnrsw.cnic.navy.mil content in translated form, whether by Google Translate or by any other translation services, do so at their own risk.
IE users: Please note that Google Translate may not render correctly when using Internet Explorer. Users are advised to use MS Edge, Safari, Chrome, or Firefox browser to take full advantage of the Google Translate feature.
The official text of content on this site is the English version found on this website. If any questions arise related to the accuracy of the information contained in translated text, refer to the English version on this website, it is the official version.