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Extreme Heat
During the summer months, the City of Grapevine is frequently affected by severe heat hazards. Domes of high pressure blanket the area with hot and dry conditions. The high pressure prevents other weather features, such as cool fronts or rain events, from impacting the area and providing necessary relief. Daily high temperatures during the summer months range into the upper 90’s and low 100’s.

The Heat Index is what is known as the apparent temperature. When high surface temperatures combine with a moderate to high relative humidity level, the resulting heat index or “feels like” temperature moves into dangerous levels. A heat index of 105 degrees or higher is considered the level where many people begin to experience extreme discomfort and physical distress.

The major human risks associated with extreme heat include heatstroke, heat exhaustion, heat syncope, and heat cramps. The most at risk populations are outdoor laborers, the elderly, children, and people in poor physical health.