2023-05-21|Sunatori's Premature and Postmature Termination of Alert

Potential Discovery or Invention

• Alerting parameters Environment Canada uses for issuing a Frost Advisory

  Threshold criteria
  Issued during the growing season when widespread frost formation is expected over an extensive area. Surface temperatures are expected to fall near freezing in the overnight period.

• Weather app shows Frost Advisory from Environment Canada, stating the following.

  Alert in Effect
  From 11:15 AM (EDT), May 21, until 3:12 AM (EDT), May 22

  

• However, tapping a module to reveal a deeper set of hourly temperature and precipitation data clearly shows that the minimum temperature occurs at about 06:00, which is 3 hours after Frost Advisory is terminated.

  Daily Summary
  Monday's low will be 5° between 05:00 and 06:00, and the high will be 18° between 17:00 and 18:00.

  

• Later, Frost Advisory was revised to be until 13:03 when forecast temperature is 14 C.

  Frost Advisory
  Frost Advisory until 11:59, Monday, May 22

  

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"Sunatori, Go Simon" <GS.Sunatori@HyperInfo.CA>

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• 2025-10-15T17:09:35.000Z