Homographs are words that are spelled the same regardless of pronunciation (they may be pronounced the same or differently). Homonyms are words that are both spelled and pronounced the same. Therefore a homonym is both a type of homograph and a type of homophone. To be correct I believe the Venn diagram should have one circle labeled homograph and the other labeled homophone. The intersection should be labeled homonym.
An Excessive Heat Warning is issued when heat indices are expected to reach at least 105 degrees, except at least 110 degrees over Delmarva and far southern New Jersey (Salem, Cumberland, Cape May, and Atlantic Counties).
In the range of 90 to 105 F, heat cramps and exhaustion may occur. Between 105 and 130 F, heat exhaustion is almost certain, and activities should be significantly limited. An environmental temperature over 130 degrees F is likely to lead to heatstroke. Heat-related illnesses include: