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Excessive Heat Criteria
NOAA's
National Weather Service - Las Vegas, Nevada
WFO Las Vegas will issue excessive heat warnings for elevations below 4000 in their
CWA when the forecast high temperature in Las Vegas is:
- 105 or higher from 9/12 to 5/31.
- When the forecast temperature at Las Vegas is within 3 degrees of the
polynominal best-fit curve for daily record high temperatures at Las Vegas
from 6/1 to about 8/6, then gradually transitioning back to a base of 105 by 9/12.
Climatology indicates these values would be met on approximately 10 days of the year.
See the graph and chart below for specific daily criteria:
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www.weather.gov 
