Public Information Statement
Issued by NWS Miami, FL

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Public Information Statement
National Weather Service Miami FL
1140 AM EDT Thu Jun 20 2024

...New, Experimental Heat Advisory and Excessive Heat Warning
Criteria for Broward County...

Beginning July 1st, the National Weather Service Weather Forecast
Office in Miami (WFO Miami) will test a change to the Heat Advisory
and Excessive Heat Warning criteria for public forecast zones in
Broward County. This change is in conjunction with the current pilot
project in Miami-Dade County which has been in place since 2023.
The new criteria for Broward County is better aligned with local
climatology, as well as recent health data which indicate that
significant health impacts from heat occur at heat index values
lower than the current advisory/warning criteria.

Broward County will now have the same heat advisory/excessive heat
warning criteria as Miami-Dade County, which is as follows for each
public zone in those counties:

UGC Forecast Zone Number    Weather Forecast Zone Name
FLZ073                      Inland Miami-Dade
FLZ074                    Metro Miami-Dade
FLZ173                    Coastal Miami-Dade
FLZ174                      Far South Miami-Dade
FLZ071                      Inland Broward
FLZ072                      Metro Broward
FLZ172                    Coastal Broward

- Heat Advisory: Heat Index of 105F or higher for at least 2 hours

- Excessive Heat Warning: Heat Index of 110F or higher for at least 2
hours

The remaining WFO Miami public forecast zones below will continue with
the existing heat advisory/excessive heat warning criteria (Advisory:
Heat Index 108F or higher for at least 2 hours, Warning: Heat Index
113F or higher for at least 2 hours):

UGC Forecast Zone Number    Weather Forecast Zone Name
FLZ063                      Glades
FLZ066                    Hendry
FLZ067                      Inland Palm Beach
FLZ068                      Metro Palm Beach
FLZ069                      Coastal Collier
FLZ070                    Inland Collier
FLZ075                    Mainland Monroe
FLZ168                      Coastal Palm Beach

The new, experimental criteria for Broward County, which will match
the existing Miami-Dade County criteria, is based on local temperature
climatology and frequency of heat index values at or above the newly
defined criteria. The new criteria better aligns with the historical
frequency of heat index values above the newly defined criteria, and
is closer to heat index values at which significant health impacts
from heat can occur.

Evaluation of this experiment will take place during and after the
2024 heat season to determine if these changes will become official
policy in future years for parts or all of the WFO Miami service area.

For any questions, please contact:

Robert Molleda, Meteorologist-in-Charge

Robert.Molleda@noaa.gov, 305-229-4522 ext. 222

$$