Significant Coastal Impacts to the Eastern Seaboard; Hurricane Nolo to Impact Hawaii

A Nor'easter will bring significant coastal impacts to the Mid-Atlantic and New England through the weekend. Moderate to major coastal flooding, heavy rain, strong winds and high surf expected. Hurricane Nolo is expected to stay just south of the Big Island of Hawaii. However, strong winds and heavy rainfall may bring life-threatening, catastrophic flooding and mudslides through the weekend. Read More >

Definitions of a Fire Weather Watch and a Red Flag Warning

A Fire Weather Watch or Red Flag Warning is issued when the combination of dry fuels and weather conditions support extreme fire danger. These products are written for land and fire managers to highlight the increased fire danger.

Each NWS office creates local criteria for fire weather watches and red flag warnings. The criteria for northern Illinois and northwest Indiana include:

Sustained 20 foot winds of 20 mph or higher.
Afternoon relative humidity less than 25%.
10 hour fuel moisture at 8% or less for one day.

A Fire Weather Watch is issued up to 72 hours before the above conditions are expected to occur.

A Red Flag Warning is issued when the conditions above are expected to occur or are occurring within the next 24 hours.

Click to get to the NWS Chicago Fire Weather Page

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