Will hazardous weather occur within the next week?

In order to keep the public informed about potential weather threats, the National Weather Service Detroit/Pontiac issues a daily outlook that highlights the likelihood for hazardous weather occurring over the next seven days. This Hazardous Weather Outlook (HWO) is issued around 500 AM each day and updated as needed.

What is included?

  • Thunderstorms: Anytime they are forecast since all thunderstorms contain lightning, and are therefore hazardous. Thunderstorms expected in the today or tonight period will include a mention of the expected movement (ex: Northeast at 35 mph) and whether or not they are expected to be severe.
  • Snow: When forecasters are expecting one inch or more of accumulation, typically over the next 72 hours. Beyond 72 hours, the HWO will highlight any storm system that may potentially lead to the issuance of winter weather watches, warnings, or advisories.
  • Strong Winds: sustained winds greater than 40 mph, or wind gusts exceeding 45 mph
  • Freezing Rain or Freezing Drizzle
  • Fog: visibilities less than 1/4 of a mile
  • Wind Chill: readings less than -15 degrees F
  • Frost and Freeze information (seasonal)
  • Extreme Heat: values greater than 100 degrees
  • Flooding
  • Marine Hazards: Issuance or potential issuance of Small Craft Advisories, Gale or Storm Watches/Warnings, Brisk Wind Advisories, Low Water Advisories
  • Rip Currents (seasonal)
  • Spotter Information Statement: Highlights the potential for spotter activation.

The Hazardous Weather Outlook can usually be found on the front page of our website, or by visiting: http://www.crh.noaa.gov/dtx/outlook.php.

Another excellent resource during active weather is our Severe Weather Summary page, located at http://www.crh.noaa.gov/dtx/svr.php. By clicking on your county of interest, you can get a list of all watches, warnings, and advisories currently in effect.


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