Public Information Statement
Issued by NWS Cleveland, OH

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NOUS41 KCLE 191510

Public Information Statement
National Weather Service Cleveland OH
1110 AM EDT Fri May 19 2023

...Criteria Modified for Extreme Heat Products across Extreme
   Northwest Pennsylvania Beginning June 20, 2023...

The National Weather Service in Cleveland serving Extreme
Northwest Pennsylvania will modify the criteria that support the
issuance of heat advisory and excessive heat warning products
effective on June 20, 2023.

A Heat Advisory is typically issued within 24 hours of the onset
of dangerous heat. An Excessive Heat Warning is typically issued
within 24 hours of the start of hazardous heat, and confidence is
high that this event will occur.

This change explicitly removes any locally established or regional
overnight minimum temperature threshold and the minimum consecutive
duration requirement of heat indices exceeding a threshold for
more than 2 hours. The thresholds for triggering heat products
based on maximum instantaneous (any duration) heat index values
will remain unchanged at 100 degrees for Heat Advisories and 105
degrees for Excessive Heat Warnings.

These changes apply to Extreme Northwest Pennsylvania, including
Erie and Crawford counties.

This change is being coordinated with local partners, including
health officials and emergency managers across Pennsylvania.

If you have any questions or comments regarding this change, do
not hesitate to contact the Warning Coordination Meteorologist
Freddie Zeigler at: or call 2 1 6 - 4 1 6
- 2 9 0 0.

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